feat(sessions): add a session manager to switch between sessions, tabs and panes and create new ones (#2721)

* write/read session metadata to disk for all sessions

* switch session client side

* fix tests

* various adjustments

* fix full screen focus bug in tiled panes

* fix tests

* fix permission sorting issue

* cleanups

* add session manager

* fix tests

* various cleanups

* style(fmt): rustfmt

* clear screen before switching sessions

* I hate you clippy

* truncate controls line to width

* version session cache

* attempt to fix plugin tests

* style(fmt): rustfmt

* another attempt to fix the tests in the ci

Cargo.lock

@@ -2868,6 +2868,17 @@ dependencies = [
  "yaml-rust",
 ]
 
+[[package]]
+name = "session-manager"
+version = "0.1.0"
+dependencies = [
+ "ansi_term",
+ "chrono",
+ "fuzzy-matcher",
+ "unicode-width",
+ "zellij-tile",
+]
+
 [[package]]
 name = "sha-1"
 version = "0.8.2"
@@ -3596,9 +3607,9 @@ checksum = "7e8820f5d777f6224dc4be3632222971ac30164d4a258d595640799554ebfd99"
 
 [[package]]
 name = "unicode-width"
-version = "0.1.9"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3ed742d4ea2bd1176e236172c8429aaf54486e7ac098db29ffe6529e0ce50973"
+checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
 
 [[package]]
 name = "unsafe-any-ors"

Cargo.toml

@@ -35,6 +35,7 @@ members = [
     "default-plugins/strider",
     "default-plugins/tab-bar",
     "default-plugins/fixture-plugin-for-tests",
+    "default-plugins/session-manager",
     "zellij-client",
     "zellij-server",
     "zellij-utils",

default-plugins/session-manager/.cargo/config.toml

@@ -0,0 +1,2 @@
+[build]
+target = "wasm32-wasi"

default-plugins/session-manager/.gitignore

@@ -0,0 +1 @@
+/target

default-plugins/session-manager/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "session-manager"
+version = "0.1.0"
+authors = ["Aram Drevekenin <aram@poor.dev>"]
+edition = "2018"
+
+[dependencies]
+ansi_term = "0.12.1"
+zellij-tile = { path = "../../zellij-tile" }
+chrono = "0.4.0"
+fuzzy-matcher = "0.3.7"
+unicode-width = "0.1.10"

default-plugins/session-manager/src/main.rs

@@ -0,0 +1,208 @@
+mod session_list;
+mod ui;
+use zellij_tile::prelude::*;
+
+use std::collections::BTreeMap;
+
+use ui::{
+    components::{render_controls_line, render_new_session_line, render_prompt, Colors},
+    SessionUiInfo,
+};
+
+use session_list::SessionList;
+
+#[derive(Default)]
+struct State {
+    session_name: Option<String>,
+    sessions: SessionList,
+    selected_index: Option<usize>,
+    search_term: String,
+    new_session_name: Option<String>,
+    colors: Colors,
+}
+
+register_plugin!(State);
+
+impl ZellijPlugin for State {
+    fn load(&mut self, _configuration: BTreeMap<String, String>) {
+        subscribe(&[
+            EventType::ModeUpdate,
+            EventType::SessionUpdate,
+            EventType::Key,
+        ]);
+    }
+
+    fn update(&mut self, event: Event) -> bool {
+        let mut should_render = false;
+        match event {
+            Event::ModeUpdate(mode_info) => {
+                self.colors = Colors::new(mode_info.style.colors);
+                should_render = true;
+            },
+            Event::Key(key) => {
+                should_render = self.handle_key(key);
+            },
+            Event::PermissionRequestResult(_result) => {
+                should_render = true;
+            },
+            Event::SessionUpdate(session_infos) => {
+                self.update_session_infos(session_infos);
+                should_render = true;
+            },
+            _ => (),
+        };
+        should_render
+    }
+
+    fn render(&mut self, rows: usize, cols: usize) {
+        render_prompt(
+            self.new_session_name.is_some(),
+            &self.search_term,
+            self.colors,
+        );
+        let room_for_list = rows.saturating_sub(5); // search line and controls
+        self.sessions.update_rows(room_for_list);
+        let list = self
+            .sessions
+            .render(room_for_list, cols.saturating_sub(7), self.colors); // 7 for various ui
+        for line in list {
+            println!("{}", line.render());
+        }
+        render_new_session_line(
+            &self.new_session_name,
+            self.sessions.is_searching,
+            self.colors,
+        );
+        render_controls_line(self.sessions.is_searching, rows, cols, self.colors);
+    }
+}
+
+impl State {
+    fn reset_selected_index(&mut self) {
+        self.selected_index = None;
+    }
+    fn handle_key(&mut self, key: Key) -> bool {
+        let mut should_render = false;
+        if let Key::Right = key {
+            if self.new_session_name.is_none() {
+                self.sessions.result_expand();
+            }
+            should_render = true;
+        } else if let Key::Left = key {
+            if self.new_session_name.is_none() {
+                self.sessions.result_shrink();
+            }
+            should_render = true;
+        } else if let Key::Down = key {
+            if self.new_session_name.is_none() {
+                self.sessions.move_selection_down();
+            }
+            should_render = true;
+        } else if let Key::Up = key {
+            if self.new_session_name.is_none() {
+                self.sessions.move_selection_up();
+            }
+            should_render = true;
+        } else if let Key::Char(character) = key {
+            if character == '\n' {
+                self.handle_selection();
+            } else if let Some(new_session_name) = self.new_session_name.as_mut() {
+                new_session_name.push(character);
+            } else {
+                self.search_term.push(character);
+                self.sessions
+                    .update_search_term(&self.search_term, &self.colors);
+            }
+            should_render = true;
+        } else if let Key::Backspace = key {
+            if let Some(new_session_name) = self.new_session_name.as_mut() {
+                if new_session_name.is_empty() {
+                    self.new_session_name = None;
+                } else {
+                    new_session_name.pop();
+                }
+            } else {
+                self.search_term.pop();
+                self.sessions
+                    .update_search_term(&self.search_term, &self.colors);
+            }
+            should_render = true;
+        } else if let Key::Ctrl('w') = key {
+            if self.sessions.is_searching {
+                // no-op
+            } else if self.new_session_name.is_some() {
+                self.new_session_name = None;
+            } else {
+                self.new_session_name = Some(String::new());
+            }
+            should_render = true;
+        } else if let Key::Ctrl('c') = key {
+            if let Some(new_session_name) = self.new_session_name.as_mut() {
+                if new_session_name.is_empty() {
+                    self.new_session_name = None;
+                } else {
+                    new_session_name.clear()
+                }
+            } else if !self.search_term.is_empty() {
+                self.search_term.clear();
+                self.sessions
+                    .update_search_term(&self.search_term, &self.colors);
+                self.reset_selected_index();
+            } else {
+                self.reset_selected_index();
+                hide_self();
+            }
+            should_render = true;
+        } else if let Key::Esc = key {
+            hide_self();
+        }
+        should_render
+    }
+    fn handle_selection(&mut self) {
+        if let Some(new_session_name) = &self.new_session_name {
+            if new_session_name.is_empty() {
+                switch_session(None);
+            } else if self.session_name.as_ref() == Some(new_session_name) {
+                // noop - we're already here!
+                self.new_session_name = None;
+            } else {
+                switch_session(Some(new_session_name));
+            }
+        } else if let Some(selected_session_name) = self.sessions.get_selected_session_name() {
+            let selected_tab = self.sessions.get_selected_tab_position();
+            let selected_pane = self.sessions.get_selected_pane_id();
+            let is_current_session = self.sessions.selected_is_current_session();
+            if is_current_session {
+                if let Some((pane_id, is_plugin)) = selected_pane {
+                    if is_plugin {
+                        focus_plugin_pane(pane_id, true);
+                    } else {
+                        focus_terminal_pane(pane_id, true);
+                    }
+                } else if let Some(tab_position) = selected_tab {
+                    go_to_tab(tab_position as u32);
+                }
+            } else {
+                switch_session_with_focus(&selected_session_name, selected_tab, selected_pane);
+            }
+        }
+        hide_self();
+    }
+    fn update_session_infos(&mut self, session_infos: Vec<SessionInfo>) {
+        let session_infos: Vec<SessionUiInfo> = session_infos
+            .iter()
+            .map(|s| SessionUiInfo::from_session_info(s))
+            .collect();
+        let current_session_name = session_infos.iter().find_map(|s| {
+            if s.is_current_session {
+                Some(s.name.clone())
+            } else {
+                None
+            }
+        });
+        if let Some(current_session_name) = current_session_name {
+            self.session_name = Some(current_session_name);
+        }
+        self.sessions.set_sessions(session_infos);
+    }
+}

default-plugins/session-manager/src/session_list.rs

@@ -0,0 +1,381 @@
+use fuzzy_matcher::skim::SkimMatcherV2;
+use fuzzy_matcher::FuzzyMatcher;
+
+use crate::ui::{
+    components::{Colors, LineToRender, ListItem},
+    SessionUiInfo,
+};
+
+#[derive(Debug, Default)]
+pub struct SessionList {
+    pub session_ui_infos: Vec<SessionUiInfo>,
+    pub selected_index: SelectedIndex,
+    pub selected_search_index: Option<usize>,
+    pub search_results: Vec<SearchResult>,
+    pub is_searching: bool,
+}
+
+impl SessionList {
+    pub fn set_sessions(&mut self, mut session_ui_infos: Vec<SessionUiInfo>) {
+        session_ui_infos.sort_unstable_by(|a, b| {
+            if a.is_current_session {
+                std::cmp::Ordering::Less
+            } else if b.is_current_session {
+                std::cmp::Ordering::Greater
+            } else {
+                a.name.cmp(&b.name)
+            }
+        });
+        self.session_ui_infos = session_ui_infos;
+    }
+    pub fn update_search_term(&mut self, search_term: &str, colors: &Colors) {
+        let mut flattened_assets = self.flatten_assets(colors);
+        let mut matches = vec![];
+        let matcher = SkimMatcherV2::default().use_cache(true);
+        for (list_item, session_name, tab_position, pane_id, is_current_session) in
+            flattened_assets.drain(..)
+        {
+            if let Some((score, indices)) = matcher.fuzzy_indices(&list_item.name, &search_term) {
+                matches.push(SearchResult::new(
+                    score,
+                    indices,
+                    list_item,
+                    session_name,
+                    tab_position,
+                    pane_id,
+                    is_current_session,
+                ));
+            }
+        }
+        matches.sort_by(|a, b| b.score.cmp(&a.score));
+        self.search_results = matches;
+        self.is_searching = !search_term.is_empty();
+        self.selected_search_index = Some(0);
+    }
+    fn flatten_assets(
+        &self,
+        colors: &Colors,
+    ) -> Vec<(ListItem, String, Option<usize>, Option<(u32, bool)>, bool)> {
+        // list_item, session_name, tab_position, (pane_id, is_plugin), is_current_session
+        let mut list_items = vec![];
+        for session in &self.session_ui_infos {
+            let session_name = session.name.clone();
+            let is_current_session = session.is_current_session;
+            list_items.push((
+                ListItem::from_session_info(session, *colors),
+                session_name.clone(),
+                None,
+                None,
+                is_current_session,
+            ));
+            for tab in &session.tabs {
+                let tab_position = tab.position;
+                list_items.push((
+                    ListItem::from_tab_info(session, tab, *colors),
+                    session_name.clone(),
+                    Some(tab_position),
+                    None,
+                    is_current_session,
+                ));
+                for pane in &tab.panes {
+                    let pane_id = (pane.pane_id, pane.is_plugin);
+                    list_items.push((
+                        ListItem::from_pane_info(session, tab, pane, *colors),
+                        session_name.clone(),
+                        Some(tab_position),
+                        Some(pane_id),
+                        is_current_session,
+                    ));
+                }
+            }
+        }
+        list_items
+    }
+    pub fn get_selected_session_name(&self) -> Option<String> {
+        if self.is_searching {
+            self.selected_search_index
+                .and_then(|i| self.search_results.get(i))
+                .map(|s| s.session_name.clone())
+        } else {
+            self.selected_index
+                .0
+                .and_then(|i| self.session_ui_infos.get(i))
+                .map(|s_i| s_i.name.clone())
+        }
+    }
+    pub fn selected_is_current_session(&self) -> bool {
+        if self.is_searching {
+            self.selected_search_index
+                .and_then(|i| self.search_results.get(i))
+                .map(|s| s.is_current_session)
+                .unwrap_or(false)
+        } else {
+            self.selected_index
+                .0
+                .and_then(|i| self.session_ui_infos.get(i))
+                .map(|s_i| s_i.is_current_session)
+                .unwrap_or(false)
+        }
+    }
+    pub fn get_selected_tab_position(&self) -> Option<usize> {
+        if self.is_searching {
+            self.selected_search_index
+                .and_then(|i| self.search_results.get(i))
+                .and_then(|s| s.tab_position)
+        } else {
+            self.selected_index
+                .0
+                .and_then(|i| self.session_ui_infos.get(i))
+                .and_then(|s_i| {
+                    self.selected_index
+                        .1
+                        .and_then(|i| s_i.tabs.get(i))
+                        .map(|t| t.position)
+                })
+        }
+    }
+    pub fn get_selected_pane_id(&self) -> Option<(u32, bool)> {
+        // (pane_id, is_plugin)
+        if self.is_searching {
+            self.selected_search_index
+                .and_then(|i| self.search_results.get(i))
+                .and_then(|s| s.pane_id)
+        } else {
+            self.selected_index
+                .0
+                .and_then(|i| self.session_ui_infos.get(i))
+                .and_then(|s_i| {
+                    self.selected_index
+                        .1
+                        .and_then(|i| s_i.tabs.get(i))
+                        .and_then(|t| {
+                            self.selected_index
+                                .2
+                                .and_then(|i| t.panes.get(i))
+                                .map(|p| (p.pane_id, p.is_plugin))
+                        })
+                })
+        }
+    }
+    pub fn move_selection_down(&mut self) {
+        if self.is_searching {
+            match self.selected_search_index.as_mut() {
+                Some(search_index) => {
+                    *search_index = search_index.saturating_add(1);
+                },
+                None => {
+                    if !self.search_results.is_empty() {
+                        self.selected_search_index = Some(0);
+                    }
+                },
+            }
+        } else {
+            match self.selected_index {
+                SelectedIndex(None, None, None) => {
+                    if !self.session_ui_infos.is_empty() {
+                        self.selected_index.0 = Some(0);
+                    }
+                },
+                SelectedIndex(Some(selected_session), None, None) => {
+                    if self.session_ui_infos.len() > selected_session + 1 {
+                        self.selected_index.0 = Some(selected_session + 1);
+                    } else {
+                        self.selected_index.0 = None;
+                        self.selected_index.1 = None;
+                        self.selected_index.2 = None;
+                    }
+                },
+                SelectedIndex(Some(selected_session), Some(selected_tab), None) => {
+                    if self
+                        .get_session(selected_session)
+                        .map(|s| s.tabs.len() > selected_tab + 1)
+                        .unwrap_or(false)
+                    {
+                        self.selected_index.1 = Some(selected_tab + 1);
+                    } else {
+                        self.selected_index.1 = Some(0);
+                    }
+                },
+                SelectedIndex(Some(selected_session), Some(selected_tab), Some(selected_pane)) => {
+                    if self
+                        .get_session(selected_session)
+                        .and_then(|s| s.tabs.get(selected_tab))
+                        .map(|t| t.panes.len() > selected_pane + 1)
+                        .unwrap_or(false)
+                    {
+                        self.selected_index.2 = Some(selected_pane + 1);
+                    } else {
+                        self.selected_index.2 = Some(0);
+                    }
+                },
+                _ => {},
+            }
+        }
+    }
+    pub fn move_selection_up(&mut self) {
+        if self.is_searching {
+            match self.selected_search_index.as_mut() {
+                Some(search_index) => {
+                    *search_index = search_index.saturating_sub(1);
+                },
+                None => {
+                    if !self.search_results.is_empty() {
+                        self.selected_search_index = Some(0);
+                    }
+                },
+            }
+        } else {
+            match self.selected_index {
+                SelectedIndex(None, None, None) => {
+                    if !self.session_ui_infos.is_empty() {
+                        self.selected_index.0 = Some(self.session_ui_infos.len().saturating_sub(1))
+                    }
+                },
+                SelectedIndex(Some(selected_session), None, None) => {
+                    if selected_session > 0 {
+                        self.selected_index.0 = Some(selected_session - 1);
+                    } else {
+                        self.selected_index.0 = None;
+                    }
+                },
+                SelectedIndex(Some(selected_session), Some(selected_tab), None) => {
+                    if selected_tab > 0 {
+                        self.selected_index.1 = Some(selected_tab - 1);
+                    } else {
+                        let tab_count = self
+                            .get_session(selected_session)
+                            .map(|s| s.tabs.len())
+                            .unwrap_or(0);
+                        self.selected_index.1 = Some(tab_count.saturating_sub(1))
+                    }
+                },
+                SelectedIndex(Some(selected_session), Some(selected_tab), Some(selected_pane)) => {
+                    if selected_pane > 0 {
+                        self.selected_index.2 = Some(selected_pane - 1);
+                    } else {
+                        let pane_count = self
+                            .get_session(selected_session)
+                            .and_then(|s| s.tabs.get(selected_tab))
+                            .map(|t| t.panes.len())
+                            .unwrap_or(0);
+                        self.selected_index.2 = Some(pane_count.saturating_sub(1))
+                    }
+                },
+                _ => {},
+            }
+        }
+    }
+    fn get_session(&self, index: usize) -> Option<&SessionUiInfo> {
+        self.session_ui_infos.get(index)
+    }
+    pub fn result_expand(&mut self) {
+        // we can't move this to SelectedIndex because the borrow checker is mean
+        match self.selected_index {
+            SelectedIndex(Some(selected_session), None, None) => {
+                let selected_session_has_tabs = self
+                    .get_session(selected_session)
+                    .map(|s| !s.tabs.is_empty())
+                    .unwrap_or(false);
+                if selected_session_has_tabs {
+                    self.selected_index.1 = Some(0);
+                }
+            },
+            SelectedIndex(Some(selected_session), Some(selected_tab), None) => {
+                let selected_tab_has_panes = self
+                    .get_session(selected_session)
+                    .and_then(|s| s.tabs.get(selected_tab))
+                    .map(|t| !t.panes.is_empty())
+                    .unwrap_or(false);
+                if selected_tab_has_panes {
+                    self.selected_index.2 = Some(0);
+                }
+            },
+            _ => {},
+        }
+    }
+    pub fn result_shrink(&mut self) {
+        self.selected_index.result_shrink();
+    }
+    pub fn update_rows(&mut self, rows: usize) {
+        if let Some(search_result_rows_until_selected) = self.selected_search_index.map(|i| {
+            self.search_results
+                .iter()
+                .enumerate()
+                .take(i + 1)
+                .fold(0, |acc, s| acc + s.1.lines_to_render())
+        }) {
+            if search_result_rows_until_selected > rows
+                || self.selected_search_index >= Some(self.search_results.len())
+            {
+                self.selected_search_index = None;
+            }
+        }
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct SelectedIndex(pub Option<usize>, pub Option<usize>, pub Option<usize>);
+
+impl SelectedIndex {
+    pub fn tabs_are_visible(&self) -> bool {
+        self.1.is_some()
+    }
+    pub fn panes_are_visible(&self) -> bool {
+        self.2.is_some()
+    }
+    pub fn selected_tab_index(&self) -> Option<usize> {
+        self.1
+    }
+    pub fn session_index_is_selected(&self, index: usize) -> bool {
+        self.0 == Some(index)
+    }
+    pub fn result_shrink(&mut self) {
+        match self {
+            SelectedIndex(Some(_selected_session), None, None) => self.0 = None,
+            SelectedIndex(Some(_selected_session), Some(_selected_tab), None) => self.1 = None,
+            SelectedIndex(Some(_selected_session), Some(_selected_tab), Some(_selected_pane)) => {
+                self.2 = None
+            },
+            _ => {},
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct SearchResult {
+    score: i64,
+    indices: Vec<usize>,
+    list_item: ListItem,
+    session_name: String,
+    tab_position: Option<usize>,
+    pane_id: Option<(u32, bool)>,
+    is_current_session: bool,
+}
+
+impl SearchResult {
+    pub fn new(
+        score: i64,
+        indices: Vec<usize>,
+        list_item: ListItem,
+        session_name: String,
+        tab_position: Option<usize>,
+        pane_id: Option<(u32, bool)>,
+        is_current_session: bool,
+    ) -> Self {
+        SearchResult {
+            score,
+            indices,
+            list_item,
+            session_name,
+            tab_position,
+            pane_id,
+            is_current_session,
+        }
+    }
+    pub fn lines_to_render(&self) -> usize {
+        self.list_item.line_count()
+    }
+    pub fn render(&self, max_width: usize) -> Vec<LineToRender> {
+        self.list_item.render(Some(self.indices.clone()), max_width)
+    }
+}

default-plugins/session-manager/src/ui/components.rs

@@ -0,0 +1,577 @@
+use unicode_width::UnicodeWidthChar;
+use unicode_width::UnicodeWidthStr;
+use zellij_tile::prelude::*;
+
+use crate::ui::{PaneUiInfo, SessionUiInfo, TabUiInfo};
+
+#[derive(Debug)]
+pub struct ListItem {
+    pub name: String,
+    pub session_name: Option<Vec<UiSpan>>,
+    pub tab_name: Option<Vec<UiSpan>>,
+    pub pane_name: Option<Vec<UiSpan>>,
+    colors: Colors,
+}
+
+impl ListItem {
+    pub fn from_session_info(session_ui_info: &SessionUiInfo, colors: Colors) -> Self {
+        let session_ui_line = build_session_ui_line(session_ui_info, colors);
+        ListItem {
+            name: session_ui_info.name.clone(),
+            session_name: Some(session_ui_line),
+            tab_name: None,
+            pane_name: None,
+            colors,
+        }
+    }
+    pub fn from_tab_info(
+        session_ui_info: &SessionUiInfo,
+        tab_ui_info: &TabUiInfo,
+        colors: Colors,
+    ) -> Self {
+        let session_ui_line = build_session_ui_line(session_ui_info, colors);
+        let tab_ui_line = build_tab_ui_line(tab_ui_info, colors);
+        ListItem {
+            name: tab_ui_info.name.clone(),
+            session_name: Some(session_ui_line),
+            tab_name: Some(tab_ui_line),
+            pane_name: None,
+            colors,
+        }
+    }
+    pub fn from_pane_info(
+        session_ui_info: &SessionUiInfo,
+        tab_ui_info: &TabUiInfo,
+        pane_ui_info: &PaneUiInfo,
+        colors: Colors,
+    ) -> Self {
+        let session_ui_line = build_session_ui_line(session_ui_info, colors);
+        let tab_ui_line = build_tab_ui_line(tab_ui_info, colors);
+        let pane_ui_line = build_pane_ui_line(pane_ui_info, colors);
+        ListItem {
+            name: pane_ui_info.name.clone(),
+            session_name: Some(session_ui_line),
+            tab_name: Some(tab_ui_line),
+            pane_name: Some(pane_ui_line),
+            colors,
+        }
+    }
+    pub fn line_count(&self) -> usize {
+        let mut line_count = 0;
+        if self.session_name.is_some() {
+            line_count += 1
+        };
+        if self.tab_name.is_some() {
+            line_count += 1
+        };
+        if self.pane_name.is_some() {
+            line_count += 1
+        };
+        line_count
+    }
+    pub fn render(&self, indices: Option<Vec<usize>>, max_cols: usize) -> Vec<LineToRender> {
+        let mut lines_to_render = vec![];
+        if let Some(session_name) = &self.session_name {
+            let indices = if self.tab_name.is_none() && self.pane_name.is_none() {
+                indices.clone()
+            } else {
+                None
+            };
+            let mut line_to_render = LineToRender::new(self.colors);
+            let mut remaining_cols = max_cols;
+            for span in session_name {
+                span.render(
+                    indices
+                        .clone()
+                        .map(|i| (SpanStyle::ForegroundBold(self.colors.palette.magenta), i)),
+                    &mut line_to_render,
+                    &mut remaining_cols,
+                );
+            }
+            lines_to_render.push(line_to_render);
+        }
+        if let Some(tab_name) = &self.tab_name {
+            let indices = if self.pane_name.is_none() {
+                indices.clone()
+            } else {
+                None
+            };
+            let mut line_to_render = LineToRender::new(self.colors);
+            let mut remaining_cols = max_cols;
+            for span in tab_name {
+                span.render(
+                    indices
+                        .clone()
+                        .map(|i| (SpanStyle::ForegroundBold(self.colors.palette.magenta), i)),
+                    &mut line_to_render,
+                    &mut remaining_cols,
+                );
+            }
+            lines_to_render.push(line_to_render);
+        }
+        if let Some(pane_name) = &self.pane_name {
+            let mut line_to_render = LineToRender::new(self.colors);
+            let mut remaining_cols = max_cols;
+            for span in pane_name {
+                span.render(
+                    indices
+                        .clone()
+                        .map(|i| (SpanStyle::ForegroundBold(self.colors.palette.magenta), i)),
+                    &mut line_to_render,
+                    &mut remaining_cols,
+                );
+            }
+            lines_to_render.push(line_to_render);
+        }
+        lines_to_render
+    }
+}
+
+#[derive(Debug)]
+pub enum UiSpan {
+    UiSpanTelescope(UiSpanTelescope),
+    TruncatableUiSpan(TruncatableUiSpan),
+}
+
+impl UiSpan {
+    pub fn render(
+        &self,
+        indices: Option<(SpanStyle, Vec<usize>)>,
+        line_to_render: &mut LineToRender,
+        remaining_cols: &mut usize,
+    ) {
+        match self {
+            UiSpan::UiSpanTelescope(ui_span_telescope) => {
+                ui_span_telescope.render(line_to_render, remaining_cols)
+            },
+            UiSpan::TruncatableUiSpan(truncatable_ui_span) => {
+                truncatable_ui_span.render(indices, line_to_render, remaining_cols)
+            },
+        }
+    }
+}
+
+#[allow(dead_code)] // in the future this will be moved to be its own component
+#[derive(Debug)]
+pub enum SpanStyle {
+    None,
+    Bold,
+    Foreground(PaletteColor),
+    ForegroundBold(PaletteColor),
+}
+
+impl SpanStyle {
+    pub fn style_string(&self, to_style: &str) -> String {
+        match self {
+            SpanStyle::None => to_style.to_owned(),
+            SpanStyle::Bold => format!("\u{1b}[1m{}\u{1b}[22m", to_style),
+            SpanStyle::Foreground(color) => match color {
+                PaletteColor::EightBit(byte) => {
+                    format!("\u{1b}[38;5;{byte}m{}\u{1b}[39m", to_style)
+                },
+                PaletteColor::Rgb((r, g, b)) => {
+                    format!("\u{1b}[38;2;{};{};{}m{}\u{1b}[39m", r, g, b, to_style)
+                },
+            },
+            SpanStyle::ForegroundBold(color) => match color {
+                PaletteColor::EightBit(byte) => {
+                    format!("\u{1b}[38;5;{byte};1m{}\u{1b}[39;22m", to_style)
+                },
+                PaletteColor::Rgb((r, g, b)) => {
+                    format!("\u{1b}[38;2;{};{};{};1m{}\u{1b}[39;22m", r, g, b, to_style)
+                },
+            },
+        }
+    }
+}
+
+impl Default for SpanStyle {
+    fn default() -> Self {
+        SpanStyle::None
+    }
+}
+
+#[derive(Debug, Default)]
+pub struct TruncatableUiSpan {
+    text: String,
+    style: SpanStyle,
+}
+
+impl TruncatableUiSpan {
+    pub fn new(text: String, style: SpanStyle) -> Self {
+        TruncatableUiSpan { text, style }
+    }
+    pub fn render(
+        &self,
+        indices: Option<(SpanStyle, Vec<usize>)>,
+        line_to_render: &mut LineToRender,
+        remaining_cols: &mut usize,
+    ) {
+        let mut rendered = String::new();
+        let truncated = if *remaining_cols >= self.text.width() {
+            self.text.clone()
+        } else {
+            let mut truncated = String::new();
+            for character in self.text.chars() {
+                if truncated.width() + character.width().unwrap_or(0) <= *remaining_cols {
+                    truncated.push(character);
+                } else {
+                    break;
+                }
+            }
+            truncated
+        };
+        match indices {
+            Some((index_style, indices)) => {
+                for (i, character) in truncated.chars().enumerate() {
+                    // TODO: optimize this by splitting the string up by its indices and only pushing those
+                    // chu8nks
+                    if indices.contains(&i) {
+                        rendered.push_str(&index_style.style_string(&character.to_string()));
+                    } else {
+                        rendered.push_str(&self.style.style_string(&character.to_string()));
+                    }
+                }
+            },
+            None => {
+                rendered.push_str(&self.style.style_string(&truncated));
+            },
+        }
+        *remaining_cols = remaining_cols.saturating_sub(truncated.width());
+        line_to_render.append(&rendered);
+    }
+}
+
+#[derive(Debug, Default)]
+pub struct UiSpanTelescope(Vec<StringAndLength>);
+
+impl UiSpanTelescope {
+    pub fn new(string_and_lengths: Vec<StringAndLength>) -> Self {
+        UiSpanTelescope(string_and_lengths)
+    }
+    pub fn render(&self, line_to_render: &mut LineToRender, remaining_cols: &mut usize) {
+        for string_and_length in &self.0 {
+            if string_and_length.length < *remaining_cols {
+                line_to_render.append(&string_and_length.string);
+                *remaining_cols -= string_and_length.length;
+                break;
+            }
+        }
+    }
+}
+
+#[derive(Debug, Default, Clone)]
+pub struct StringAndLength {
+    pub string: String,
+    pub length: usize,
+}
+
+impl StringAndLength {
+    pub fn new(string: String, length: usize) -> Self {
+        StringAndLength { string, length }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct LineToRender {
+    line: String,
+    is_selected: bool,
+    truncated_result_count: usize,
+    colors: Colors,
+}
+
+impl LineToRender {
+    pub fn new(colors: Colors) -> Self {
+        LineToRender {
+            line: String::default(),
+            is_selected: false,
+            truncated_result_count: 0,
+            colors,
+        }
+    }
+    pub fn append(&mut self, to_append: &str) {
+        self.line.push_str(to_append)
+    }
+    pub fn make_selected(&mut self) {
+        self.is_selected = true;
+        match self.colors.palette.gray {
+            PaletteColor::EightBit(byte) => {
+                self.line = format!(
+                    "\u{1b}[48;5;{byte}m\u{1b}[K\r\u{1b}[48;5;{byte}m{}",
+                    self.line
+                );
+            },
+            PaletteColor::Rgb((r, g, b)) => {
+                self.line = format!(
+                    "\u{1b}[48;2;{};{};{}m\u{1b}[K\r\u{1b}[48;5;{};{};{}m{}",
+                    r, g, b, r, g, b, self.line
+                );
+            },
+        }
+    }
+    pub fn render(&self) -> String {
+        let mut line = self.line.clone();
+
+        let more = if self.truncated_result_count > 0 {
+            self.colors
+                .red(&format!(" [+{}]", self.truncated_result_count))
+        } else {
+            String::new()
+        };
+
+        line.push_str(&more);
+        if self.is_selected {
+            self.line.clone()
+        } else {
+            format!("\u{1b}[49m{}", line)
+        }
+    }
+    pub fn add_truncated_results(&mut self, result_count: usize) {
+        self.truncated_result_count += result_count;
+    }
+}
+
+pub fn build_session_ui_line(session_ui_info: &SessionUiInfo, colors: Colors) -> Vec<UiSpan> {
+    let mut ui_spans = vec![];
+    let tab_count_text = session_ui_info.tabs.len();
+    let total_pane_count_text = session_ui_info
+        .tabs
+        .iter()
+        .fold(0, |acc, tab| acc + tab.panes.len());
+    let tab_count = format!("{}", tab_count_text);
+    let tab_count_styled = colors.cyan(&tab_count);
+    let total_pane_count = format!("{}", total_pane_count_text);
+    let total_pane_count_styled = colors.green(&total_pane_count);
+    let session_name = &session_ui_info.name;
+    let connected_users = format!("{}", session_ui_info.connected_users);
+    let connected_users_styled = colors.orange(&connected_users);
+    let session_bullet_span =
+        UiSpan::UiSpanTelescope(UiSpanTelescope::new(vec![StringAndLength::new(
+            format!(" > "),
+            3,
+        )]));
+    let session_name_span = UiSpan::TruncatableUiSpan(TruncatableUiSpan::new(
+        session_name.clone(),
+        SpanStyle::ForegroundBold(colors.palette.orange),
+    ));
+    let tab_and_pane_count = UiSpan::UiSpanTelescope(UiSpanTelescope::new(vec![
+        StringAndLength::new(
+            format!(" ({tab_count_styled} tabs, {total_pane_count_styled} panes)"),
+            2 + tab_count.width() + 7 + total_pane_count.width() + 7,
+        ),
+        StringAndLength::new(
+            format!(" ({tab_count_styled}, {total_pane_count_styled})"),
+            2 + tab_count.width() + 2 + total_pane_count.width() + 3,
+        ),
+    ]));
+    let connected_users_count = UiSpan::UiSpanTelescope(UiSpanTelescope::new(vec![
+        StringAndLength::new(
+            format!(" [{connected_users_styled} connected users]"),
+            2 + connected_users.width() + 17,
+        ),
+        StringAndLength::new(
+            format!(" [{connected_users_styled}]"),
+            2 + connected_users.width() + 1,
+        ),
+    ]));
+    ui_spans.push(session_bullet_span);
+    ui_spans.push(session_name_span);
+    ui_spans.push(tab_and_pane_count);
+    ui_spans.push(connected_users_count);
+    if session_ui_info.is_current_session {
+        let current_session_indication = UiSpan::UiSpanTelescope(UiSpanTelescope::new(vec![
+            StringAndLength::new(colors.orange(&format!(" <CURRENT SESSION>")), 18),
+            StringAndLength::new(colors.orange(&format!(" <CURRENT>")), 10),
+            StringAndLength::new(colors.orange(&format!(" <C>")), 4),
+        ]));
+        ui_spans.push(current_session_indication);
+    }
+    ui_spans
+}
+
+pub fn build_tab_ui_line(tab_ui_info: &TabUiInfo, colors: Colors) -> Vec<UiSpan> {
+    let mut ui_spans = vec![];
+    let tab_name = &tab_ui_info.name;
+    let pane_count_text = tab_ui_info.panes.len();
+    let pane_count = format!("{}", pane_count_text);
+    let pane_count_styled = colors.green(&pane_count);
+    let tab_bullet_span =
+        UiSpan::UiSpanTelescope(UiSpanTelescope::new(vec![StringAndLength::new(
+            format!("  - "),
+            4,
+        )]));
+    let tab_name_span = UiSpan::TruncatableUiSpan(TruncatableUiSpan::new(
+        tab_name.clone(),
+        SpanStyle::ForegroundBold(colors.palette.cyan),
+    ));
+    let connected_users_count_span = UiSpan::UiSpanTelescope(UiSpanTelescope::new(vec![
+        StringAndLength::new(
+            format!(" ({pane_count_styled} panes)"),
+            2 + pane_count.width() + 7,
+        ),
+        StringAndLength::new(
+            format!(" ({pane_count_styled})"),
+            2 + pane_count.width() + 1,
+        ),
+    ]));
+    ui_spans.push(tab_bullet_span);
+    ui_spans.push(tab_name_span);
+    ui_spans.push(connected_users_count_span);
+    ui_spans
+}
+
+pub fn build_pane_ui_line(pane_ui_info: &PaneUiInfo, colors: Colors) -> Vec<UiSpan> {
+    let mut ui_spans = vec![];
+    let pane_name = pane_ui_info.name.clone();
+    let exit_code = pane_ui_info.exit_code.map(|exit_code_number| {
+        let exit_code = format!("{}", exit_code_number);
+        let exit_code = if exit_code_number == 0 {
+            colors.green(&exit_code)
+        } else {
+            colors.red(&exit_code)
+        };
+        exit_code
+    });
+    let pane_bullet_span =
+        UiSpan::UiSpanTelescope(UiSpanTelescope::new(vec![StringAndLength::new(
+            format!("    > "),
+            6,
+        )]));
+    ui_spans.push(pane_bullet_span);
+    let pane_name_span =
+        UiSpan::TruncatableUiSpan(TruncatableUiSpan::new(pane_name, SpanStyle::Bold));
+    ui_spans.push(pane_name_span);
+    if let Some(exit_code) = exit_code {
+        let pane_name_span = UiSpan::UiSpanTelescope(UiSpanTelescope::new(vec![
+            StringAndLength::new(
+                format!(" (EXIT CODE: {exit_code})"),
+                13 + exit_code.width() + 1,
+            ),
+            StringAndLength::new(format!(" ({exit_code})"), 2 + exit_code.width() + 1),
+        ]));
+        ui_spans.push(pane_name_span);
+    }
+    ui_spans
+}
+
+pub fn minimize_lines(
+    total_count: usize,
+    line_count_to_remove: usize,
+    selected_index: Option<usize>,
+) -> (usize, usize, usize, usize) {
+    // returns: (start_index, anchor_index, end_index, lines_left_to_remove)
+    let (count_to_render, line_count_to_remove) = if line_count_to_remove > total_count {
+        (1, line_count_to_remove.saturating_sub(total_count) + 1)
+    } else {
+        (total_count.saturating_sub(line_count_to_remove), 0)
+    };
+    let anchor_index = selected_index.unwrap_or(0); // 5
+    let mut start_index = anchor_index.saturating_sub(count_to_render / 2);
+    let mut end_index = start_index + count_to_render;
+    if end_index > total_count {
+        start_index = start_index.saturating_sub(end_index - total_count);
+        end_index = total_count;
+    }
+    (start_index, anchor_index, end_index, line_count_to_remove)
+}
+
+pub fn render_prompt(typing_session_name: bool, search_term: &str, colors: Colors) {
+    if !typing_session_name {
+        let prompt = colors.bold(&format!("> {}_", search_term));
+        println!("{}\n", prompt);
+    } else {
+        println!("\n");
+    }
+}
+
+pub fn render_new_session_line(session_name: &Option<String>, is_searching: bool, colors: Colors) {
+    if is_searching {
+        return;
+    }
+    let new_session_shortcut_text = "<Ctrl w>";
+    let new_session_shortcut = colors.magenta(new_session_shortcut_text);
+    let new_session = colors.bold("New session");
+    let enter = colors.magenta("<ENTER>");
+    match session_name {
+        Some(session_name) => {
+            println!(
+                "\u{1b}[m > {}_ ({}, {} when done)",
+                colors.orange(session_name),
+                colors.bold("Type optional name"),
+                enter
+            );
+        },
+        None => {
+            println!("\u{1b}[m > {new_session_shortcut} - {new_session}");
+        },
+    }
+}
+
+pub fn render_controls_line(is_searching: bool, row: usize, max_cols: usize, colors: Colors) {
+    let (arrows, navigate) = if is_searching {
+        (colors.magenta("<↓↑>"), colors.bold("Navigate"))
+    } else {
+        (colors.magenta("<←↓↑→>"), colors.bold("Navigate and Expand"))
+    };
+    let enter = colors.magenta("<ENTER>");
+    let select = colors.bold("Switch to selected");
+    let esc = colors.magenta("<ESC>");
+    let to_hide = colors.bold("Hide");
+
+    if max_cols >= 80 {
+        print!(
+            "\u{1b}[m\u{1b}[{row}HHelp: {arrows} - {navigate}, {enter} - {select}, {esc} - {to_hide}"
+        );
+    } else if max_cols >= 57 {
+        let navigate = colors.bold("Navigate");
+        let select = colors.bold("Switch");
+        print!(
+            "\u{1b}[m\u{1b}[{row}HHelp: {arrows} - {navigate}, {enter} - {select}, {esc} - {to_hide}"
+        );
+    } else if max_cols >= 20 {
+        print!("\u{1b}[m\u{1b}[{row}H{arrows}/{enter}/{esc}");
+    }
+}
+
+#[derive(Debug, Default, Clone, Copy)]
+pub struct Colors {
+    pub palette: Palette,
+}
+impl Colors {
+    pub fn new(palette: Palette) -> Self {
+        Colors { palette }
+    }
+    pub fn bold(&self, text: &str) -> String {
+        format!("\u{1b}[1m{}\u{1b}[22m", text)
+    }
+
+    fn color(&self, color: &PaletteColor, text: &str) -> String {
+        match color {
+            PaletteColor::EightBit(byte) => {
+                format!("\u{1b}[38;5;{};1m{}\u{1b}[39;22m", byte, text)
+            },
+            PaletteColor::Rgb((r, g, b)) => {
+                format!("\u{1b}[38;2;{};{};{};1m{}\u{1b}[39;22m", r, g, b, text)
+            },
+        }
+    }
+    pub fn orange(&self, text: &str) -> String {
+        self.color(&self.palette.orange, text)
+    }
+
+    pub fn green(&self, text: &str) -> String {
+        self.color(&self.palette.green, text)
+    }
+
+    pub fn red(&self, text: &str) -> String {
+        self.color(&self.palette.red, text)
+    }
+
+    pub fn cyan(&self, text: &str) -> String {
+        self.color(&self.palette.cyan, text)
+    }
+
+    pub fn magenta(&self, text: &str) -> String {
+        self.color(&self.palette.magenta, text)
+    }
+}

default-plugins/session-manager/src/ui/mod.rs

@@ -0,0 +1,357 @@
+pub mod components;
+use zellij_tile::prelude::*;
+
+use crate::session_list::{SelectedIndex, SessionList};
+use components::{
+    build_pane_ui_line, build_session_ui_line, build_tab_ui_line, minimize_lines, Colors,
+    LineToRender,
+};
+
+macro_rules! render_assets {
+    ($assets:expr, $line_count_to_remove:expr, $selected_index:expr, $to_render_until_selected: expr, $to_render_after_selected:expr, $has_deeper_selected_assets:expr, $max_cols:expr, $colors:expr) => {{
+        let (start_index, anchor_asset_index, end_index, line_count_to_remove) =
+            minimize_lines($assets.len(), $line_count_to_remove, $selected_index);
+        let mut truncated_result_count_above = start_index;
+        let mut truncated_result_count_below = $assets.len().saturating_sub(end_index);
+        let mut current_index = 1;
+        if let Some(assets_to_render_before_selected) = $assets.get(start_index..anchor_asset_index)
+        {
+            for asset in assets_to_render_before_selected {
+                let mut asset: LineToRender =
+                    asset.as_line_to_render(current_index, $max_cols, $colors);
+                asset.add_truncated_results(truncated_result_count_above);
+                truncated_result_count_above = 0;
+                current_index += 1;
+                $to_render_until_selected.push(asset);
+            }
+        }
+        if let Some(selected_asset) = $assets.get(anchor_asset_index) {
+            if $selected_index.is_some() && !$has_deeper_selected_assets {
+                let mut selected_asset: LineToRender =
+                    selected_asset.as_line_to_render(current_index, $max_cols, $colors);
+                selected_asset.make_selected();
+                selected_asset.add_truncated_results(truncated_result_count_above);
+                if anchor_asset_index + 1 >= end_index {
+                    // no more results below, let's add the more indication if we need to
+                    selected_asset.add_truncated_results(truncated_result_count_below);
+                }
+                current_index += 1;
+                $to_render_until_selected.push(selected_asset);
+            } else {
+                $to_render_until_selected.push(selected_asset.as_line_to_render(
+                    current_index,
+                    $max_cols,
+                    $colors,
+                ));
+                current_index += 1;
+            }
+        }
+        if let Some(assets_to_render_after_selected) =
+            $assets.get(anchor_asset_index + 1..end_index)
+        {
+            for asset in assets_to_render_after_selected.iter().rev() {
+                let mut asset: LineToRender =
+                    asset.as_line_to_render(current_index, $max_cols, $colors);
+                asset.add_truncated_results(truncated_result_count_below);
+                truncated_result_count_below = 0;
+                current_index += 1;
+                $to_render_after_selected.insert(0, asset.into());
+            }
+        }
+        line_count_to_remove
+    }};
+}
+
+impl SessionList {
+    pub fn render(&self, max_rows: usize, max_cols: usize, colors: Colors) -> Vec<LineToRender> {
+        if self.is_searching {
+            self.render_search_results(max_rows, max_cols)
+        } else {
+            self.render_list(max_rows, max_cols, colors)
+        }
+    }
+    fn render_search_results(&self, max_rows: usize, max_cols: usize) -> Vec<LineToRender> {
+        let mut lines_to_render = vec![];
+        for (i, result) in self.search_results.iter().enumerate() {
+            if lines_to_render.len() + result.lines_to_render() <= max_rows {
+                let mut result_lines = result.render(max_cols);
+                if Some(i) == self.selected_search_index {
+                    for line_to_render in result_lines.iter_mut() {
+                        line_to_render.make_selected();
+                    }
+                }
+                lines_to_render.append(&mut result_lines);
+            } else {
+                break;
+            }
+        }
+        lines_to_render
+    }
+    fn render_list(&self, max_rows: usize, max_cols: usize, colors: Colors) -> Vec<LineToRender> {
+        let mut lines_to_render_until_selected = vec![];
+        let mut lines_to_render_after_selected = vec![];
+        let total_lines_to_render = self.total_lines_to_render();
+        let line_count_to_remove = total_lines_to_render.saturating_sub(max_rows);
+        let line_count_to_remove = self.render_sessions(
+            &mut lines_to_render_until_selected,
+            &mut lines_to_render_after_selected,
+            line_count_to_remove,
+            max_cols,
+            colors,
+        );
+        let line_count_to_remove = self.render_tabs(
+            &mut lines_to_render_until_selected,
+            &mut lines_to_render_after_selected,
+            line_count_to_remove,
+            max_cols,
+            colors,
+        );
+        self.render_panes(
+            &mut lines_to_render_until_selected,
+            &mut lines_to_render_after_selected,
+            line_count_to_remove,
+            max_cols,
+            colors,
+        );
+        let mut lines_to_render = lines_to_render_until_selected;
+        lines_to_render.append(&mut lines_to_render_after_selected);
+        lines_to_render
+    }
+    fn render_sessions(
+        &self,
+        to_render_until_selected: &mut Vec<LineToRender>,
+        to_render_after_selected: &mut Vec<LineToRender>,
+        line_count_to_remove: usize,
+        max_cols: usize,
+        colors: Colors,
+    ) -> usize {
+        render_assets!(
+            self.session_ui_infos,
+            line_count_to_remove,
+            self.selected_index.0,
+            to_render_until_selected,
+            to_render_after_selected,
+            self.selected_index.1.is_some(),
+            max_cols,
+            colors
+        )
+    }
+    fn render_tabs(
+        &self,
+        to_render_until_selected: &mut Vec<LineToRender>,
+        to_render_after_selected: &mut Vec<LineToRender>,
+        line_count_to_remove: usize,
+        max_cols: usize,
+        colors: Colors,
+    ) -> usize {
+        if self.selected_index.1.is_none() {
+            return line_count_to_remove;
+        }
+        if let Some(tabs_in_session) = self
+            .selected_index
+            .0
+            .and_then(|i| self.session_ui_infos.get(i))
+            .map(|s| &s.tabs)
+        {
+            render_assets!(
+                tabs_in_session,
+                line_count_to_remove,
+                self.selected_index.1,
+                to_render_until_selected,
+                to_render_after_selected,
+                self.selected_index.2.is_some(),
+                max_cols,
+                colors
+            )
+        } else {
+            line_count_to_remove
+        }
+    }
+    fn render_panes(
+        &self,
+        to_render_until_selected: &mut Vec<LineToRender>,
+        to_render_after_selected: &mut Vec<LineToRender>,
+        line_count_to_remove: usize,
+        max_cols: usize,
+        colors: Colors,
+    ) -> usize {
+        if self.selected_index.2.is_none() {
+            return line_count_to_remove;
+        }
+        if let Some(panes_in_session) = self
+            .selected_index
+            .0
+            .and_then(|i| self.session_ui_infos.get(i))
+            .map(|s| &s.tabs)
+            .and_then(|tabs| {
+                self.selected_index
+                    .1
+                    .and_then(|i| tabs.get(i))
+                    .map(|t| &t.panes)
+            })
+        {
+            render_assets!(
+                panes_in_session,
+                line_count_to_remove,
+                self.selected_index.2,
+                to_render_until_selected,
+                to_render_after_selected,
+                false,
+                max_cols,
+                colors
+            )
+        } else {
+            line_count_to_remove
+        }
+    }
+    fn total_lines_to_render(&self) -> usize {
+        self.session_ui_infos
+            .iter()
+            .enumerate()
+            .fold(0, |acc, (index, s)| {
+                if self.selected_index.session_index_is_selected(index) {
+                    acc + s.line_count(&self.selected_index)
+                } else {
+                    acc + 1
+                }
+            })
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct SessionUiInfo {
+    pub name: String,
+    pub tabs: Vec<TabUiInfo>,
+    pub connected_users: usize,
+    pub is_current_session: bool,
+}
+
+impl SessionUiInfo {
+    pub fn from_session_info(session_info: &SessionInfo) -> Self {
+        SessionUiInfo {
+            name: session_info.name.clone(),
+            tabs: session_info
+                .tabs
+                .iter()
+                .map(|t| TabUiInfo::new(t, &session_info.panes))
+                .collect(),
+            connected_users: session_info.connected_clients,
+            is_current_session: session_info.is_current_session,
+        }
+    }
+    pub fn line_count(&self, selected_index: &SelectedIndex) -> usize {
+        let mut line_count = 1; // self
+        if selected_index.tabs_are_visible() {
+            match selected_index
+                .selected_tab_index()
+                .and_then(|i| self.tabs.get(i))
+                .map(|t| t.line_count(&selected_index))
+            {
+                Some(line_count_of_selected_tab) => {
+                    // we add the line count in the selected tab minus 1 because we will account
+                    // for the selected tab line itself in self.tabs.len() below
+                    line_count += line_count_of_selected_tab.saturating_sub(1);
+                    line_count += self.tabs.len();
+                },
+                None => {
+                    line_count += self.tabs.len();
+                },
+            }
+        }
+        line_count
+    }
+    fn as_line_to_render(
+        &self,
+        _session_index: u8,
+        mut max_cols: usize,
+        colors: Colors,
+    ) -> LineToRender {
+        let mut line_to_render = LineToRender::new(colors);
+        let ui_spans = build_session_ui_line(&self, colors);
+        for span in ui_spans {
+            span.render(None, &mut line_to_render, &mut max_cols);
+        }
+        line_to_render
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct TabUiInfo {
+    pub name: String,
+    pub panes: Vec<PaneUiInfo>,
+    pub position: usize,
+}
+
+impl TabUiInfo {
+    pub fn new(tab_info: &TabInfo, pane_manifest: &PaneManifest) -> Self {
+        let panes = pane_manifest
+            .panes
+            .get(&tab_info.position)
+            .map(|p| {
+                p.iter()
+                    .filter_map(|pane_info| {
+                        if pane_info.is_selectable {
+                            Some(PaneUiInfo {
+                                name: pane_info.title.clone(),
+                                exit_code: pane_info.exit_status.clone(),
+                                pane_id: pane_info.id,
+                                is_plugin: pane_info.is_plugin,
+                            })
+                        } else {
+                            None
+                        }
+                    })
+                    .collect()
+            })
+            .unwrap_or_default();
+        TabUiInfo {
+            name: tab_info.name.clone(),
+            panes,
+            position: tab_info.position,
+        }
+    }
+    pub fn line_count(&self, selected_index: &SelectedIndex) -> usize {
+        let mut line_count = 1; // self
+        if selected_index.panes_are_visible() {
+            line_count += self.panes.len()
+        }
+        line_count
+    }
+    fn as_line_to_render(
+        &self,
+        _session_index: u8,
+        mut max_cols: usize,
+        colors: Colors,
+    ) -> LineToRender {
+        let mut line_to_render = LineToRender::new(colors);
+        let ui_spans = build_tab_ui_line(&self, colors);
+        for span in ui_spans {
+            span.render(None, &mut line_to_render, &mut max_cols);
+        }
+        line_to_render
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct PaneUiInfo {
+    pub name: String,
+    pub exit_code: Option<i32>,
+    pub pane_id: u32,
+    pub is_plugin: bool,
+}
+
+impl PaneUiInfo {
+    fn as_line_to_render(
+        &self,
+        _session_index: u8,
+        mut max_cols: usize,
+        colors: Colors,
+    ) -> LineToRender {
+        let mut line_to_render = LineToRender::new(colors);
+        let ui_spans = build_pane_ui_line(&self, colors);
+        for span in ui_spans {
+            span.render(None, &mut line_to_render, &mut max_cols);
+        }
+        line_to_render
+    }
+}

src/commands.rs

@@ -16,6 +16,7 @@ use zellij_client::{
 use zellij_server::{os_input_output::get_server_os_input, start_server as start_server_impl};
 use zellij_utils::{
     cli::{CliArgs, Command, SessionCommand, Sessions},
+    data::ConnectToSession,
     envs,
     input::{
         actions::Action,
@@ -331,7 +332,33 @@ pub(crate) fn start_client(opts: CliArgs) {
             process::exit(1);
         },
     };
+    let mut reconnect_to_session: Option<ConnectToSession> = None;
     let os_input = get_os_input(get_client_os_input);
+    loop {
+        let os_input = os_input.clone();
+        let config = config.clone();
+        let layout = layout.clone();
+        let mut config_options = config_options.clone();
+        let mut opts = opts.clone();
+
+        if let Some(reconnect_to_session) = &reconnect_to_session {
+            // this is integration code to make session reconnects work with this existing,
+            // untested and pretty involved function
+            //
+            // ideally, we should write tests for this whole function and refctor it
+            if reconnect_to_session.name.is_some() {
+                opts.command = Some(Command::Sessions(Sessions::Attach {
+                    session_name: reconnect_to_session.name.clone(),
+                    create: true,
+                    index: None,
+                    options: None,
+                }));
+            } else {
+                opts.command = None;
+                opts.session = None;
+                config_options.attach_to_session = None;
+            }
+        }
 
         let start_client_plan = |session_name: std::string::String| {
             assert_session_ne(&session_name);
@@ -345,7 +372,9 @@ pub(crate) fn start_client(opts: CliArgs) {
         })) = opts.command.clone()
         {
             let config_options = match options.as_deref() {
-            Some(SessionCommand::Options(o)) => config_options.merge_from_cli(o.to_owned().into()),
+                Some(SessionCommand::Options(o)) => {
+                    config_options.merge_from_cli(o.to_owned().into())
+                },
                 None => config_options,
             };
 
@@ -364,8 +393,7 @@ pub(crate) fn start_client(opts: CliArgs) {
 
             if let Ok(val) = std::env::var(envs::SESSION_NAME_ENV_KEY) {
                 if val == *client.get_session_name() {
-                eprintln!("You are trying to attach to the current session (\"{}\"). Zellij does not support nesting a session in itself.", val);
+                    panic!("You are trying to attach to the current session (\"{}\"). This is not supported.", val);
-                process::exit(1);
                 }
             }
 
@@ -374,24 +402,34 @@ pub(crate) fn start_client(opts: CliArgs) {
                 ClientInfo::New(_) => Some(layout),
             };
 
-        start_client_impl(
+            let tab_position_to_focus = reconnect_to_session
+                .as_ref()
+                .and_then(|r| r.tab_position.clone());
+            let pane_id_to_focus = reconnect_to_session
+                .as_ref()
+                .and_then(|r| r.pane_id.clone());
+            reconnect_to_session = start_client_impl(
                 Box::new(os_input),
                 opts,
                 config,
                 config_options,
                 client,
                 attach_layout,
+                tab_position_to_focus,
+                pane_id_to_focus,
             );
         } else {
             if let Some(session_name) = opts.session.clone() {
                 start_client_plan(session_name.clone());
-            start_client_impl(
+                reconnect_to_session = start_client_impl(
                     Box::new(os_input),
                     opts,
                     config,
                     config_options,
                     ClientInfo::New(session_name),
                     Some(layout),
+                    None,
+                    None,
                 );
             } else {
                 if let Some(session_name) = config_options.session_name.as_ref() {
@@ -419,45 +457,57 @@ pub(crate) fn start_client(opts: CliArgs) {
                                 ClientInfo::Attach(_, _) => None,
                                 ClientInfo::New(_) => Some(layout),
                             };
-                        start_client_impl(
+                            reconnect_to_session = start_client_impl(
                                 Box::new(os_input),
                                 opts,
                                 config,
                                 config_options,
                                 client,
                                 attach_layout,
+                                None,
+                                None,
                             );
                         },
                         _ => {
                             start_client_plan(session_name.clone());
-                        start_client_impl(
+                            reconnect_to_session = start_client_impl(
                                 Box::new(os_input),
                                 opts,
                                 config,
                                 config_options.clone(),
                                 ClientInfo::New(session_name.clone()),
                                 Some(layout),
+                                None,
+                                None,
                             );
                         },
                     }
+                    if reconnect_to_session.is_some() {
+                        continue;
+                    }
                     // after we detach, this happens and so we need to exit before the rest of the
                     // function happens
-                // TODO: offload this to a different function
                     process::exit(0);
                 }
 
                 let session_name = generate_unique_session_name();
                 start_client_plan(session_name.clone());
-            start_client_impl(
+                reconnect_to_session = start_client_impl(
                     Box::new(os_input),
                     opts,
                     config,
                     config_options,
                     ClientInfo::New(session_name),
                     Some(layout),
+                    None,
+                    None,
                 );
             }
         }
+        if reconnect_to_session.is_none() {
+            break;
+        }
+    }
 }
 
 fn generate_unique_session_name() -> String {

xtask/src/main.rs

@@ -35,6 +35,7 @@ lazy_static::lazy_static! {
         WorkspaceMember{crate_name: "default-plugins/strider", build: true},
         WorkspaceMember{crate_name: "default-plugins/tab-bar", build: true},
         WorkspaceMember{crate_name: "default-plugins/fixture-plugin-for-tests", build: true},
+        WorkspaceMember{crate_name: "default-plugins/session-manager", build: true},
         WorkspaceMember{crate_name: "zellij-utils", build: false},
         WorkspaceMember{crate_name: "zellij-tile-utils", build: false},
         WorkspaceMember{crate_name: "zellij-tile", build: false},

zellij-client/src/input_handler.rs

@@ -157,6 +157,9 @@ impl InputHandler {
                         .send(ClientInstruction::DoneParsingStdinQuery)
                         .unwrap();
                 },
+                Ok((InputInstruction::Exit, _error_context)) => {
+                    self.should_exit = true;
+                },
                 Err(err) => panic!("Encountered read error: {:?}", err),
             }
         }

zellij-client/src/lib.rs

@@ -23,8 +23,8 @@ use crate::{
 };
 use zellij_utils::{
     channels::{self, ChannelWithContext, SenderWithContext},
-    consts::ZELLIJ_IPC_PIPE,
+    consts::{set_permissions, ZELLIJ_SOCK_DIR},
-    data::{ClientId, InputMode, Style},
+    data::{ClientId, ConnectToSession, InputMode, Style},
     envs,
     errors::{ClientContext, ContextType, ErrorInstruction},
     input::{config::Config, options::Options},
@@ -46,6 +46,7 @@ pub(crate) enum ClientInstruction {
     StartedParsingStdinQuery,
     DoneParsingStdinQuery,
     Log(Vec<String>),
+    SwitchSession(ConnectToSession),
 }
 
 impl From<ServerToClientMsg> for ClientInstruction {
@@ -60,6 +61,9 @@ impl From<ServerToClientMsg> for ClientInstruction {
             ServerToClientMsg::Connected => ClientInstruction::Connected,
             ServerToClientMsg::ActiveClients(clients) => ClientInstruction::ActiveClients(clients),
             ServerToClientMsg::Log(log_lines) => ClientInstruction::Log(log_lines),
+            ServerToClientMsg::SwitchSession(connect_to_session) => {
+                ClientInstruction::SwitchSession(connect_to_session)
+            },
         }
     }
 }
@@ -77,6 +81,7 @@ impl From<&ClientInstruction> for ClientContext {
             ClientInstruction::Log(_) => ClientContext::Log,
             ClientInstruction::StartedParsingStdinQuery => ClientContext::StartedParsingStdinQuery,
             ClientInstruction::DoneParsingStdinQuery => ClientContext::DoneParsingStdinQuery,
+            ClientInstruction::SwitchSession(..) => ClientContext::SwitchSession,
         }
     }
 }
@@ -130,6 +135,7 @@ pub(crate) enum InputInstruction {
     AnsiStdinInstructions(Vec<AnsiStdinInstruction>),
     StartedParsing,
     DoneParsing,
+    Exit,
 }
 
 pub fn start_client(
@@ -139,8 +145,12 @@ pub fn start_client(
     config_options: Options,
     info: ClientInfo,
     layout: Option<Layout>,
-) {
+    tab_position_to_focus: Option<usize>,
+    pane_id_to_focus: Option<(u32, bool)>, // (pane_id, is_plugin)
+) -> Option<ConnectToSession> {
     info!("Starting Zellij client!");
+
+    let mut reconnect_to_session = None;
     let clear_client_terminal_attributes = "\u{1b}[?1l\u{1b}=\u{1b}[r\u{1b}[?1000l\u{1b}[?1002l\u{1b}[?1003l\u{1b}[?1005l\u{1b}[?1006l\u{1b}[?12l";
     let take_snapshot = "\u{1b}[?1049h";
     let bracketed_paste = "\u{1b}[?2004h";
@@ -172,28 +182,51 @@ pub fn start_client(
         keybinds: config.keybinds.clone(),
     };
 
-    let first_msg = match info {
+    let create_ipc_pipe = || -> std::path::PathBuf {
-        ClientInfo::Attach(name, config_options) => {
+        let mut sock_dir = ZELLIJ_SOCK_DIR.clone();
-            envs::set_session_name(name);
+        std::fs::create_dir_all(&sock_dir).unwrap();
+        set_permissions(&sock_dir, 0o700).unwrap();
+        sock_dir.push(envs::get_session_name().unwrap());
+        sock_dir
+    };
 
-            ClientToServerMsg::AttachClient(client_attributes, config_options)
+    let (first_msg, ipc_pipe) = match info {
+        ClientInfo::Attach(name, config_options) => {
+            envs::set_session_name(name.clone());
+            os_input.update_session_name(name);
+            let ipc_pipe = create_ipc_pipe();
+
+            (
+                ClientToServerMsg::AttachClient(
+                    client_attributes,
+                    config_options,
+                    tab_position_to_focus,
+                    pane_id_to_focus,
+                ),
+                ipc_pipe,
+            )
         },
         ClientInfo::New(name) => {
-            envs::set_session_name(name);
+            envs::set_session_name(name.clone());
+            os_input.update_session_name(name);
+            let ipc_pipe = create_ipc_pipe();
 
-            spawn_server(&*ZELLIJ_IPC_PIPE, opts.debug).unwrap();
+            spawn_server(&*ipc_pipe, opts.debug).unwrap();
 
+            (
                 ClientToServerMsg::NewClient(
                     client_attributes,
                     Box::new(opts),
                     Box::new(config_options.clone()),
                     Box::new(layout.unwrap()),
                     Some(config.plugins.clone()),
+                ),
+                ipc_pipe,
             )
         },
     };
 
-    os_input.connect_to_server(&*ZELLIJ_IPC_PIPE);
+    os_input.connect_to_server(&*ipc_pipe);
     os_input.send_to_server(first_msg);
 
     let mut command_is_executing = CommandIsExecuting::new();
@@ -336,7 +369,7 @@ pub fn start_client(
         std::process::exit(1);
     };
 
-    let exit_msg: String;
+    let mut exit_msg = String::new();
     let mut loading = true;
     let mut pending_instructions = vec![];
 
@@ -415,13 +448,18 @@ pub fn start_client(
                     log::info!("{line}");
                 }
             },
+            ClientInstruction::SwitchSession(connect_to_session) => {
+                reconnect_to_session = Some(connect_to_session);
+                os_input.send_to_server(ClientToServerMsg::ClientExited);
+                break;
+            },
             _ => {},
         }
     }
 
     router_thread.join().unwrap();
 
-    // cleanup();
+    if reconnect_to_session.is_none() {
         let reset_style = "\u{1b}[m";
         let show_cursor = "\u{1b}[?25h";
         let restore_snapshot = "\u{1b}[?1049l";
@@ -437,6 +475,16 @@ pub fn start_client(
         let mut stdout = os_input.get_stdout_writer();
         let _ = stdout.write(goodbye_message.as_bytes()).unwrap();
         stdout.flush().unwrap();
+    } else {
+        let clear_screen = "\u{1b}[2J";
+        let mut stdout = os_input.get_stdout_writer();
+        let _ = stdout.write(clear_screen.as_bytes()).unwrap();
+        stdout.flush().unwrap();
+    }
+
+    let _ = send_input_instructions.send(InputInstruction::Exit);
+
+    reconnect_to_session
 }
 
 #[cfg(test)]

zellij-client/src/os_input_output.rs

@@ -78,6 +78,8 @@ pub struct ClientOsInputOutput {
     orig_termios: Option<Arc<Mutex<termios::Termios>>>,
     send_instructions_to_server: Arc<Mutex<Option<IpcSenderWithContext<ClientToServerMsg>>>>,
     receive_instructions_from_server: Arc<Mutex<Option<IpcReceiverWithContext<ServerToClientMsg>>>>,
+    reading_from_stdin: Arc<Mutex<Option<Vec<u8>>>>,
+    session_name: Arc<Mutex<Option<String>>>,
 }
 
 /// The `ClientOsApi` trait represents an abstract interface to the features of an operating system that
@@ -94,8 +96,9 @@ pub trait ClientOsApi: Send + Sync {
     /// Returns the writer that allows writing to standard output.
     fn get_stdout_writer(&self) -> Box<dyn io::Write>;
     fn get_stdin_reader(&self) -> Box<dyn io::Read>;
+    fn update_session_name(&mut self, new_session_name: String);
     /// Returns the raw contents of standard input.
-    fn read_from_stdin(&mut self) -> Vec<u8>;
+    fn read_from_stdin(&mut self) -> Result<Vec<u8>, &'static str>;
     /// Returns a [`Box`] pointer to this [`ClientOsApi`] struct.
     fn box_clone(&self) -> Box<dyn ClientOsApi>;
     /// Sends a message to the server.
@@ -135,14 +138,46 @@ impl ClientOsApi for ClientOsInputOutput {
     fn box_clone(&self) -> Box<dyn ClientOsApi> {
         Box::new((*self).clone())
     }
-    fn read_from_stdin(&mut self) -> Vec<u8> {
+    fn update_session_name(&mut self, new_session_name: String) {
+        *self.session_name.lock().unwrap() = Some(new_session_name);
+    }
+    fn read_from_stdin(&mut self) -> Result<Vec<u8>, &'static str> {
+        let session_name_at_calltime = { self.session_name.lock().unwrap().clone() };
+        // here we wait for a lock in case another thread is holding stdin
+        // this can happen for example when switching sessions, the old thread will only be
+        // released once it sees input over STDIN
+        //
+        // when this happens, we detect in the other thread that our session is ended (by comparing
+        // the session name at the beginning of the call and the one after we read from STDIN), and
+        // so place what we read from STDIN inside a buffer (the "reading_from_stdin" on our state)
+        // and release the lock
+        //
+        // then, another thread will see there's something in the buffer immediately as it acquires
+        // the lock (without having to wait for STDIN itself) forward this buffer and proceed to
+        // wait for the "real" STDIN net time it is called
+        let mut buffered_bytes = self.reading_from_stdin.lock().unwrap();
+        match buffered_bytes.take() {
+            Some(buffered_bytes) => Ok(buffered_bytes),
+            None => {
                 let stdin = std::io::stdin();
                 let mut stdin = stdin.lock();
                 let buffer = stdin.fill_buf().unwrap();
                 let length = buffer.len();
                 let read_bytes = Vec::from(buffer);
                 stdin.consume(length);
-        read_bytes
+
+                let session_name_after_reading_from_stdin =
+                    { self.session_name.lock().unwrap().clone() };
+                if session_name_at_calltime.is_some()
+                    && session_name_at_calltime != session_name_after_reading_from_stdin
+                {
+                    *buffered_bytes = Some(read_bytes);
+                    Err("Session ended")
+                } else {
+                    Ok(read_bytes)
+                }
+            },
+        }
     }
     fn get_stdout_writer(&self) -> Box<dyn io::Write> {
         let stdout = ::std::io::stdout();
@@ -258,19 +293,25 @@ impl Clone for Box<dyn ClientOsApi> {
 pub fn get_client_os_input() -> Result<ClientOsInputOutput, nix::Error> {
     let current_termios = termios::tcgetattr(0)?;
     let orig_termios = Some(Arc::new(Mutex::new(current_termios)));
+    let reading_from_stdin = Arc::new(Mutex::new(None));
     Ok(ClientOsInputOutput {
         orig_termios,
         send_instructions_to_server: Arc::new(Mutex::new(None)),
         receive_instructions_from_server: Arc::new(Mutex::new(None)),
+        reading_from_stdin,
+        session_name: Arc::new(Mutex::new(None)),
     })
 }
 
 pub fn get_cli_client_os_input() -> Result<ClientOsInputOutput, nix::Error> {
     let orig_termios = None; // not a terminal
+    let reading_from_stdin = Arc::new(Mutex::new(None));
     Ok(ClientOsInputOutput {
         orig_termios,
         send_instructions_to_server: Arc::new(Mutex::new(None)),
         receive_instructions_from_server: Arc::new(Mutex::new(None)),
+        reading_from_stdin,
+        session_name: Arc::new(Mutex::new(None)),
     })
 }
 

zellij-client/src/stdin_handler.rs

@@ -59,7 +59,8 @@ pub(crate) fn stdin_loop(
     }
     let mut ansi_stdin_events = vec![];
     loop {
-        let buf = os_input.read_from_stdin();
+        match os_input.read_from_stdin() {
+            Ok(buf) => {
                 {
                     // here we check if we need to parse specialized ANSI instructions sent over STDIN
                     // this happens either on startup (see above) or on SIGWINCH
@@ -96,7 +97,8 @@ pub(crate) fn stdin_loop(
 
                 let event_count = events.len();
                 for (i, input_event) in events.into_iter().enumerate() {
-            if holding_mouse && is_mouse_press_or_hold(&input_event) && i == event_count - 1 {
+                    if holding_mouse && is_mouse_press_or_hold(&input_event) && i == event_count - 1
+                    {
                         let mut poller = os_input.stdin_poller();
                         loop {
                             if poller.ready() {
@@ -120,6 +122,17 @@ pub(crate) fn stdin_loop(
                         ))
                         .unwrap();
                 }
+            },
+            Err(e) => {
+                if e == "Session ended" {
+                    log::debug!("Switched sessions, signing this thread off...");
+                } else {
+                    log::error!("Failed to read from STDIN: {}", e);
+                }
+                let _ = send_input_instructions.send(InputInstruction::Exit);
+                break;
+            },
+        }
     }
 }
 

zellij-client/src/unit/stdin_tests.rs

@@ -154,8 +154,9 @@ impl ClientOsApi for FakeClientOsApi {
     fn get_stdin_reader(&self) -> Box<dyn io::Read> {
         unimplemented!()
     }
-    fn read_from_stdin(&mut self) -> Vec<u8> {
+    fn update_session_name(&mut self, new_session_name: String) {}
-        self.stdin_buffer.drain(..).collect()
+    fn read_from_stdin(&mut self) -> Result<Vec<u8>, &'static str> {
+        Ok(self.stdin_buffer.drain(..).collect())
     }
     fn box_clone(&self) -> Box<dyn ClientOsApi> {
         unimplemented!()

zellij-server/src/background_jobs.rs

@@ -1,10 +1,16 @@
 use zellij_utils::async_std::task;
+use zellij_utils::consts::{ZELLIJ_SESSION_INFO_CACHE_DIR, ZELLIJ_SOCK_DIR};
+use zellij_utils::data::SessionInfo;
 use zellij_utils::errors::{prelude::*, BackgroundJobContext, ContextType};
 
-use std::collections::HashMap;
+use std::collections::{BTreeMap, HashMap};
+use std::fs;
+use std::io::Write;
+use std::os::unix::fs::FileTypeExt;
+use std::path::PathBuf;
 use std::sync::{
     atomic::{AtomicBool, Ordering},
-    Arc,
+    Arc, Mutex,
 };
 use std::time::{Duration, Instant};
 
@@ -17,6 +23,8 @@ pub enum BackgroundJob {
     DisplayPaneError(Vec<PaneId>, String),
     AnimatePluginLoading(u32),              // u32 - plugin_id
     StopPluginLoadingAnimation(u32),        // u32 - plugin_id
+    ReadAllSessionInfosOnMachine,           // u32 - plugin_id
+    ReportSessionInfo(String, SessionInfo), // String - session name
     Exit,
 }
 
@@ -28,6 +36,10 @@ impl From<&BackgroundJob> for BackgroundJobContext {
             BackgroundJob::StopPluginLoadingAnimation(..) => {
                 BackgroundJobContext::StopPluginLoadingAnimation
             },
+            BackgroundJob::ReadAllSessionInfosOnMachine => {
+                BackgroundJobContext::ReadAllSessionInfosOnMachine
+            },
+            BackgroundJob::ReportSessionInfo(..) => BackgroundJobContext::ReportSessionInfo,
             BackgroundJob::Exit => BackgroundJobContext::Exit,
         }
     }
@@ -35,11 +47,14 @@ impl From<&BackgroundJob> for BackgroundJobContext {
 
 static FLASH_DURATION_MS: u64 = 1000;
 static PLUGIN_ANIMATION_OFFSET_DURATION_MD: u64 = 500;
+static SESSION_READ_DURATION: u64 = 1000;
 
 pub(crate) fn background_jobs_main(bus: Bus<BackgroundJob>) -> Result<()> {
     let err_context = || "failed to write to pty".to_string();
     let mut running_jobs: HashMap<BackgroundJob, Instant> = HashMap::new();
     let mut loading_plugins: HashMap<u32, Arc<AtomicBool>> = HashMap::new(); // u32 - plugin_id
+    let current_session_name = Arc::new(Mutex::new(String::default()));
+    let current_session_info = Arc::new(Mutex::new(SessionInfo::default()));
 
     loop {
         let (event, mut err_ctx) = bus.recv().with_context(err_context)?;
@@ -93,10 +108,89 @@ pub(crate) fn background_jobs_main(bus: Bus<BackgroundJob>) -> Result<()> {
                     loading_plugin.store(false, Ordering::SeqCst);
                 }
             },
+            BackgroundJob::ReportSessionInfo(session_name, session_info) => {
+                *current_session_name.lock().unwrap() = session_name;
+                *current_session_info.lock().unwrap() = session_info;
+            },
+            BackgroundJob::ReadAllSessionInfosOnMachine => {
+                // this job should only be run once and it keeps track of other sessions (as well
+                // as this one's) infos (metadata mostly) and sends it to the screen which in turn
+                // forwards it to plugins and other places it needs to be
+                if running_jobs.get(&job).is_some() {
+                    continue;
+                }
+                running_jobs.insert(job, Instant::now());
+                task::spawn({
+                    let senders = bus.senders.clone();
+                    let current_session_info = current_session_info.clone();
+                    let current_session_name = current_session_name.clone();
+                    async move {
+                        loop {
+                            // write state of current session
+
+                            // write it to disk
+                            let current_session_name =
+                                current_session_name.lock().unwrap().to_string();
+                            let cache_file_name =
+                                session_info_cache_file_name(&current_session_name);
+                            let current_session_info = current_session_info.lock().unwrap().clone();
+                            let _wrote_file =
+                                std::fs::create_dir_all(ZELLIJ_SESSION_INFO_CACHE_DIR.as_path())
+                                    .and_then(|_| std::fs::File::create(cache_file_name))
+                                    .and_then(|mut f| {
+                                        write!(f, "{}", current_session_info.to_string())
+                                    });
+                            // start a background job (if not already running) that'll periodically read this and other
+                            // sesion infos and report back
+
+                            // read state of all sessions
+                            let mut other_session_names = vec![];
+                            let mut session_infos_on_machine = BTreeMap::new();
+                            // we do this so that the session infos will be actual and we're
+                            // reasonably sure their session is running
+                            if let Ok(files) = fs::read_dir(&*ZELLIJ_SOCK_DIR) {
+                                files.for_each(|file| {
+                                    if let Ok(file) = file {
+                                        if let Ok(file_name) = file.file_name().into_string() {
+                                            if file.file_type().unwrap().is_socket() {
+                                                other_session_names.push(file_name);
+                                            }
+                                        }
+                                    }
+                                });
+                            }
+
+                            for session_name in other_session_names {
+                                let session_cache_file_name = ZELLIJ_SESSION_INFO_CACHE_DIR
+                                    .join(format!("{}.kdl", session_name));
+                                if let Ok(raw_session_info) =
+                                    fs::read_to_string(&session_cache_file_name)
+                                {
+                                    if let Ok(session_info) = SessionInfo::from_string(
+                                        &raw_session_info,
+                                        &current_session_name,
+                                    ) {
+                                        session_infos_on_machine.insert(session_name, session_info);
+                                    }
+                                }
+                            }
+                            let _ = senders.send_to_screen(ScreenInstruction::UpdateSessionInfos(
+                                session_infos_on_machine,
+                            ));
+                            task::sleep(std::time::Duration::from_millis(SESSION_READ_DURATION))
+                                .await;
+                        }
+                    }
+                });
+            },
             BackgroundJob::Exit => {
                 for loading_plugin in loading_plugins.values() {
                     loading_plugin.store(false, Ordering::SeqCst);
                 }
+
+                let cache_file_name =
+                    session_info_cache_file_name(&current_session_name.lock().unwrap().to_owned());
+                let _ = std::fs::remove_file(cache_file_name);
                 return Ok(());
             },
         }
@@ -122,3 +216,7 @@ fn job_already_running(
         },
     }
 }
+
+fn session_info_cache_file_name(session_name: &str) -> PathBuf {
+    ZELLIJ_SESSION_INFO_CACHE_DIR.join(format!("{}.kdl", &session_name))
+}

zellij-server/src/lib.rs

@@ -41,7 +41,7 @@ use zellij_utils::{
     channels::{self, ChannelWithContext, SenderWithContext},
     cli::CliArgs,
     consts::{DEFAULT_SCROLL_BUFFER_SIZE, SCROLL_BUFFER_SIZE},
-    data::{Event, PluginCapabilities},
+    data::{ConnectToSession, Event, PluginCapabilities},
     errors::{prelude::*, ContextType, ErrorInstruction, FatalError, ServerContext},
     input::{
         command::{RunCommand, TerminalAction},
@@ -74,10 +74,17 @@ pub enum ServerInstruction {
     Error(String),
     KillSession,
     DetachSession(Vec<ClientId>),
-    AttachClient(ClientAttributes, Options, ClientId),
+    AttachClient(
+        ClientAttributes,
+        Options,
+        Option<usize>,       // tab position to focus
+        Option<(u32, bool)>, // (pane_id, is_plugin) => pane_id to focus
+        ClientId,
+    ),
     ConnStatus(ClientId),
     ActiveClients(ClientId),
     Log(Vec<String>, ClientId),
+    SwitchSession(ConnectToSession, ClientId),
 }
 
 impl From<&ServerInstruction> for ServerContext {
@@ -95,6 +102,7 @@ impl From<&ServerInstruction> for ServerContext {
             ServerInstruction::ConnStatus(..) => ServerContext::ConnStatus,
             ServerInstruction::ActiveClients(_) => ServerContext::ActiveClients,
             ServerInstruction::Log(..) => ServerContext::Log,
+            ServerInstruction::SwitchSession(..) => ServerContext::SwitchSession,
         }
     }
 }
@@ -415,7 +423,13 @@ pub fn start_server(mut os_input: Box<dyn ServerOsApi>, socket_path: PathBuf) {
                     .send_to_plugin(PluginInstruction::AddClient(client_id))
                     .unwrap();
             },
-            ServerInstruction::AttachClient(attrs, options, client_id) => {
+            ServerInstruction::AttachClient(
+                attrs,
+                options,
+                tab_position_to_focus,
+                pane_id_to_focus,
+                client_id,
+            ) => {
                 let rlock = session_data.read().unwrap();
                 let session_data = rlock.as_ref().unwrap();
                 session_state
@@ -433,7 +447,11 @@ pub fn start_server(mut os_input: Box<dyn ServerOsApi>, socket_path: PathBuf) {
                     .unwrap();
                 session_data
                     .senders
-                    .send_to_screen(ScreenInstruction::AddClient(client_id))
+                    .send_to_screen(ScreenInstruction::AddClient(
+                        client_id,
+                        tab_position_to_focus,
+                        pane_id_to_focus,
+                    ))
                     .unwrap();
                 session_data
                     .senders
@@ -635,6 +653,41 @@ pub fn start_server(mut os_input: Box<dyn ServerOsApi>, socket_path: PathBuf) {
                     session_state
                 );
             },
+            ServerInstruction::SwitchSession(connect_to_session, client_id) => {
+                if let Some(min_size) = session_state.read().unwrap().min_client_terminal_size() {
+                    session_data
+                        .write()
+                        .unwrap()
+                        .as_ref()
+                        .unwrap()
+                        .senders
+                        .send_to_screen(ScreenInstruction::TerminalResize(min_size))
+                        .unwrap();
+                }
+                session_data
+                    .write()
+                    .unwrap()
+                    .as_ref()
+                    .unwrap()
+                    .senders
+                    .send_to_screen(ScreenInstruction::RemoveClient(client_id))
+                    .unwrap();
+                session_data
+                    .write()
+                    .unwrap()
+                    .as_ref()
+                    .unwrap()
+                    .senders
+                    .send_to_plugin(PluginInstruction::RemoveClient(client_id))
+                    .unwrap();
+                send_to_client!(
+                    client_id,
+                    os_input,
+                    ServerToClientMsg::SwitchSession(connect_to_session),
+                    session_state
+                );
+                remove_client!(client_id, os_input, session_state);
+            },
         }
     }
 
@@ -664,13 +717,11 @@ fn init_session(
         plugins,
     } = options;
 
-    SCROLL_BUFFER_SIZE
+    let _ = SCROLL_BUFFER_SIZE.set(
-        .set(
         config_options
             .scroll_buffer_size
             .unwrap_or(DEFAULT_SCROLL_BUFFER_SIZE),
-        )
+    );
-        .unwrap();
 
     let (to_screen, screen_receiver): ChannelWithContext<ScreenInstruction> = channels::unbounded();
     let to_screen = SenderWithContext::new(to_screen);

zellij-server/src/panes/grid.rs

@@ -1351,7 +1351,7 @@ impl Grid {
         self.viewport.get(y).unwrap().absolute_character_index(x)
     }
     pub fn move_cursor_forward_until_edge(&mut self, count: usize) {
-        let count_to_move = std::cmp::min(count, self.width - self.cursor.x);
+        let count_to_move = std::cmp::min(count, self.width.saturating_sub(self.cursor.x));
         self.cursor.x += count_to_move;
     }
     pub fn replace_characters_in_line_after_cursor(&mut self, replace_with: TerminalCharacter) {

zellij-server/src/panes/tiled_panes/mod.rs

@@ -523,6 +523,11 @@ impl TiledPanes {
         }
     }
     pub fn focus_pane(&mut self, pane_id: PaneId, client_id: ClientId) {
+        if self.panes_to_hide.contains(&pane_id) {
+            // this means there is a fullscreen pane that is not the current pane, let's unset it
+            // before changing focus
+            self.unset_fullscreen();
+        }
         if self
             .panes
             .get(&pane_id)
@@ -533,7 +538,6 @@ impl TiledPanes {
                 .expand_pane(&pane_id);
             self.reapply_pane_frames();
         }
-
         self.active_panes
             .insert(client_id, pane_id, &mut self.panes);
         if self.session_is_mirrored {

zellij-server/src/plugins/unit/plugin_tests.rs

@@ -539,6 +539,7 @@ pub fn load_new_plugin_from_hd() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -609,6 +610,7 @@ pub fn plugin_workers() {
     // we send a SystemClipboardFailure to trigger the custom handler in the fixture plugin that
     // will send a message to the worker and in turn back to the plugin to be rendered, so we know
     // that this cycle is working
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -682,6 +684,7 @@ pub fn plugin_workers_persist_state() {
     // we do this a second time so that the worker will log the first message on its own state and
     // then send us the "received 2 messages" indication we check for below, letting us know it
     // managed to persist its own state and act upon it
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -820,6 +823,7 @@ pub fn switch_to_mode_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -887,6 +891,7 @@ pub fn switch_to_mode_plugin_command_permission_denied() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -954,6 +959,7 @@ pub fn new_tabs_with_layout_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1035,6 +1041,7 @@ pub fn new_tab_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1102,6 +1109,7 @@ pub fn go_to_next_tab_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1168,6 +1176,7 @@ pub fn go_to_previous_tab_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1234,6 +1243,7 @@ pub fn resize_focused_pane_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1300,6 +1310,7 @@ pub fn resize_focused_pane_with_direction_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1366,6 +1377,7 @@ pub fn focus_next_pane_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1432,6 +1444,7 @@ pub fn focus_previous_pane_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1498,6 +1511,7 @@ pub fn move_focus_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1564,6 +1578,7 @@ pub fn move_focus_or_tab_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1630,6 +1645,7 @@ pub fn edit_scrollback_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1696,6 +1712,7 @@ pub fn write_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1762,6 +1779,7 @@ pub fn write_chars_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1828,6 +1846,7 @@ pub fn toggle_tab_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1894,6 +1913,7 @@ pub fn move_pane_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -1960,6 +1980,7 @@ pub fn move_pane_with_direction_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2027,7 +2048,7 @@ pub fn clear_screen_plugin_command() {
         client_id,
         size,
     ));
-    std::thread::sleep(std::time::Duration::from_millis(100));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2095,6 +2116,7 @@ pub fn scroll_up_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2161,6 +2183,7 @@ pub fn scroll_down_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2227,6 +2250,7 @@ pub fn scroll_to_top_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2293,6 +2317,7 @@ pub fn scroll_to_bottom_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2359,6 +2384,7 @@ pub fn page_scroll_up_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2425,6 +2451,7 @@ pub fn page_scroll_down_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2491,6 +2518,7 @@ pub fn toggle_focus_fullscreen_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2557,6 +2585,7 @@ pub fn toggle_pane_frames_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2623,6 +2652,7 @@ pub fn toggle_pane_embed_or_eject_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2689,6 +2719,7 @@ pub fn undo_rename_pane_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2755,6 +2786,7 @@ pub fn close_focus_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2821,6 +2853,7 @@ pub fn toggle_active_tab_sync_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2887,6 +2920,7 @@ pub fn close_focused_tab_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -2953,6 +2987,7 @@ pub fn undo_rename_tab_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3019,6 +3054,7 @@ pub fn previous_swap_layout_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3085,6 +3121,7 @@ pub fn next_swap_layout_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3151,6 +3188,7 @@ pub fn go_to_tab_name_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3217,6 +3255,7 @@ pub fn focus_or_create_tab_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3283,6 +3322,7 @@ pub fn go_to_tab() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3349,6 +3389,7 @@ pub fn start_or_reload_plugin() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3422,6 +3463,7 @@ pub fn quit_zellij_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3495,6 +3537,7 @@ pub fn detach_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3568,6 +3611,7 @@ pub fn open_file_floating_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3641,6 +3685,7 @@ pub fn open_file_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3715,6 +3760,7 @@ pub fn open_file_with_line_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3788,6 +3834,7 @@ pub fn open_file_with_line_floating_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3861,6 +3908,7 @@ pub fn open_terminal_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -3934,6 +3982,7 @@ pub fn open_terminal_floating_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4007,6 +4056,7 @@ pub fn open_command_pane_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4080,6 +4130,7 @@ pub fn open_command_pane_floating_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4146,6 +4197,7 @@ pub fn switch_to_tab_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4207,6 +4259,7 @@ pub fn hide_self_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4268,6 +4321,7 @@ pub fn show_self_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4334,6 +4388,7 @@ pub fn close_terminal_pane_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4400,6 +4455,7 @@ pub fn close_plugin_pane_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4466,6 +4522,7 @@ pub fn focus_terminal_pane_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4532,6 +4589,7 @@ pub fn focus_plugin_pane_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4598,6 +4656,7 @@ pub fn rename_terminal_pane_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4664,6 +4723,7 @@ pub fn rename_plugin_pane_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4730,6 +4790,7 @@ pub fn rename_tab_plugin_command() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4805,6 +4866,7 @@ pub fn send_configuration_to_plugins() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4868,6 +4930,7 @@ pub fn request_plugin_permissions() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -4955,6 +5018,7 @@ pub fn granted_permission_request_result() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),
@@ -5040,6 +5104,7 @@ pub fn denied_permission_request_result() {
         client_id,
         size,
     ));
+    std::thread::sleep(std::time::Duration::from_millis(500));
     let _ = plugin_thread_sender.send(PluginInstruction::Update(vec![(
         None,
         Some(client_id),

zellij-server/src/plugins/unit/snapshots/zellij_server__plugins__plugin_tests__go_to_tab.snap

@@ -1,11 +1,11 @@
 ---
 source: zellij-server/src/plugins/./unit/plugin_tests.rs
-assertion_line: 2442
+assertion_line: 3306
 expression: "format!(\"{:#?}\", new_tab_event)"
 ---
 Some(
     GoToTab(
-        2,
+        3,
         Some(
             1,
         ),

zellij-server/src/plugins/wasm_bridge.rs

@@ -782,6 +782,7 @@ fn check_event_permission(
         Event::ModeUpdate(..)
         | Event::TabUpdate(..)
         | Event::PaneUpdate(..)
+        | Event::SessionUpdate(..)
         | Event::CopyToClipboard(..)
         | Event::SystemClipboardFailure
         | Event::InputReceived => PermissionType::ReadApplicationState,

zellij-server/src/plugins/zellij_exports.rs

@@ -2,6 +2,7 @@ use super::PluginInstruction;
 use crate::plugins::plugin_map::{PluginEnv, Subscriptions};
 use crate::plugins::wasm_bridge::handle_plugin_crash;
 use crate::route::route_action;
+use crate::ServerInstruction;
 use log::{debug, warn};
 use serde::Serialize;
 use std::{
@@ -15,7 +16,9 @@ use std::{
 };
 use wasmer::{imports, Function, ImportObject, Store, WasmerEnv};
 use wasmer_wasi::WasiEnv;
-use zellij_utils::data::{CommandType, PermissionStatus, PermissionType, PluginPermission};
+use zellij_utils::data::{
+    CommandType, ConnectToSession, PermissionStatus, PermissionType, PluginPermission,
+};
 use zellij_utils::input::permission::PermissionCache;
 
 use url::Url;
@@ -205,6 +208,12 @@ fn host_run_plugin_command(env: &ForeignFunctionEnv) {
                     PluginCommand::RequestPluginPermissions(permissions) => {
                         request_permission(env, permissions)?
                     },
+                    PluginCommand::SwitchSession(connect_to_session) => switch_session(
+                        env,
+                        connect_to_session.name,
+                        connect_to_session.tab_position,
+                        connect_to_session.pane_id,
+                    )?,
                 },
                 (PermissionStatus::Denied, permission) => {
                     log::error!(
@@ -679,6 +688,31 @@ fn detach(env: &ForeignFunctionEnv) {
     apply_action!(action, error_msg, env);
 }
 
+fn switch_session(
+    env: &ForeignFunctionEnv,
+    session_name: Option<String>,
+    tab_position: Option<usize>,
+    pane_id: Option<(u32, bool)>,
+) -> Result<()> {
+    // pane_id is (id, is_plugin)
+    let err_context = || format!("Failed to switch session");
+    let client_id = env.plugin_env.client_id;
+    let tab_position = tab_position.map(|p| p + 1); // ¯\_()_/¯
+    let connect_to_session = ConnectToSession {
+        name: session_name,
+        tab_position,
+        pane_id,
+    };
+    env.plugin_env
+        .senders
+        .send_to_server(ServerInstruction::SwitchSession(
+            connect_to_session,
+            client_id,
+        ))
+        .with_context(err_context)?;
+    Ok(())
+}
+
 fn edit_scrollback(env: &ForeignFunctionEnv) {
     let action = Action::EditScrollback;
     let error_msg = || format!("Failed to edit scrollback");
@@ -898,7 +932,7 @@ fn go_to_tab(env: &ForeignFunctionEnv, tab_index: u32) {
             env.plugin_env.name()
         )
     };
-    let action = Action::GoToTab(tab_index);
+    let action = Action::GoToTab(tab_index + 1);
     apply_action!(action, error_msg, env);
 }
 
@@ -1113,7 +1147,6 @@ fn check_command_permission(
         _ => return (PermissionStatus::Granted, None),
     };
 
-    log::info!("plugin permissions: {:?}", plugin_env.permissions);
     if let Some(permissions) = plugin_env.permissions.lock().unwrap().as_ref() {
         if permissions.contains(&permission) {
             return (PermissionStatus::Granted, None);

zellij-server/src/route.rs

@@ -860,9 +860,19 @@ pub(crate) fn route_thread_main(
                                 .send(new_client_instruction)
                                 .with_context(err_context)?;
                         },
-                        ClientToServerMsg::AttachClient(client_attributes, opts) => {
+                        ClientToServerMsg::AttachClient(
-                            let attach_client_instruction =
+                            client_attributes,
-                                ServerInstruction::AttachClient(client_attributes, opts, client_id);
+                            opts,
+                            tab_position_to_focus,
+                            pane_id_to_focus,
+                        ) => {
+                            let attach_client_instruction = ServerInstruction::AttachClient(
+                                client_attributes,
+                                opts,
+                                tab_position_to_focus,
+                                pane_id_to_focus,
+                                client_id,
+                            );
                             to_server
                                 .send(attach_client_instruction)
                                 .with_context(err_context)?;

zellij-server/src/screen.rs

@@ -6,7 +6,9 @@ use std::path::PathBuf;
 use std::rc::Rc;
 use std::str;
 
-use zellij_utils::data::{Direction, PaneManifest, PluginPermission, Resize, ResizeStrategy};
+use zellij_utils::data::{
+    Direction, PaneManifest, PluginPermission, Resize, ResizeStrategy, SessionInfo,
+};
 use zellij_utils::errors::prelude::*;
 use zellij_utils::input::command::RunCommand;
 use zellij_utils::input::options::Clipboard;
@@ -242,7 +244,11 @@ pub enum ScreenInstruction {
     MouseHoldRight(Position, ClientId),
     MouseHoldMiddle(Position, ClientId),
     Copy(ClientId),
-    AddClient(ClientId),
+    AddClient(
+        ClientId,
+        Option<usize>,       // tab position to focus
+        Option<(u32, bool)>, // (pane_id, is_plugin) => pane_id to focus
+    ),
     RemoveClient(ClientId),
     AddOverlay(Overlay, ClientId),
     RemoveOverlay(ClientId),
@@ -287,6 +293,7 @@ pub enum ScreenInstruction {
     BreakPane(Box<Layout>, Option<TerminalAction>, ClientId),
     BreakPaneRight(ClientId),
     BreakPaneLeft(ClientId),
+    UpdateSessionInfos(BTreeMap<String, SessionInfo>), // String is the session name
 }
 
 impl From<&ScreenInstruction> for ScreenContext {
@@ -460,6 +467,7 @@ impl From<&ScreenInstruction> for ScreenContext {
             ScreenInstruction::BreakPane(..) => ScreenContext::BreakPane,
             ScreenInstruction::BreakPaneRight(..) => ScreenContext::BreakPaneRight,
             ScreenInstruction::BreakPaneLeft(..) => ScreenContext::BreakPaneLeft,
+            ScreenInstruction::UpdateSessionInfos(..) => ScreenContext::UpdateSessionInfos,
         }
     }
 }
@@ -524,6 +532,9 @@ pub(crate) struct Screen {
     session_is_mirrored: bool,
     copy_options: CopyOptions,
     debug: bool,
+    session_name: String,
+    session_infos_on_machine: BTreeMap<String, SessionInfo>, // String is the session name, can
+                                                             // also be this session
 }
 
 impl Screen {
@@ -539,6 +550,10 @@ impl Screen {
         copy_options: CopyOptions,
         debug: bool,
     ) -> Self {
+        let session_name = mode_info.session_name.clone().unwrap_or_default();
+        let session_info = SessionInfo::new(session_name.clone());
+        let mut session_infos_on_machine = BTreeMap::new();
+        session_infos_on_machine.insert(session_name.clone(), session_info);
         Screen {
             bus,
             max_panes,
@@ -561,6 +576,8 @@ impl Screen {
             session_is_mirrored,
             copy_options,
             debug,
+            session_name,
+            session_infos_on_machine,
         }
     }
 
@@ -745,8 +762,8 @@ impl Screen {
                             .non_fatal();
                     }
 
-                    self.report_tab_state().with_context(err_context)?;
+                    self.log_and_report_session_state()
-                    self.report_pane_state().with_context(err_context)?;
+                        .with_context(err_context)?;
                     return self.render().with_context(err_context);
                 },
                 Err(err) => Err::<(), _>(err).with_context(err_context).non_fatal(),
@@ -879,8 +896,8 @@ impl Screen {
                     t.position -= 1;
                 }
             }
-            self.report_tab_state().with_context(err_context)?;
+            self.log_and_report_session_state()
-            self.report_pane_state().with_context(err_context)?;
+                .with_context(err_context)?;
             self.render().with_context(err_context)
         }
     }
@@ -917,7 +934,8 @@ impl Screen {
                 .with_context(err_context)?;
             tab.set_force_render();
         }
-        self.report_pane_state().with_context(err_context)?;
+        self.log_and_report_session_state()
+            .with_context(err_context)?;
         self.render().with_context(err_context)
     }
 
@@ -1183,10 +1201,9 @@ impl Screen {
             self.add_client(client_id).with_context(err_context)?;
         }
 
-        self.report_tab_state()
+        self.log_and_report_session_state()
             .and_then(|_| self.render())
-            .with_context(err_context)?;
+            .with_context(err_context)
-        self.report_pane_state().with_context(err_context)
     }
 
     pub fn add_client(&mut self, client_id: ClientId) -> Result<()> {
@@ -1237,13 +1254,38 @@ impl Screen {
             self.tab_history.remove(&client_id);
         }
         self.connected_clients.borrow_mut().remove(&client_id);
-        self.report_tab_state().with_context(err_context)
+        self.log_and_report_session_state()
+            .with_context(err_context)
     }
 
-    pub fn report_tab_state(&self) -> Result<()> {
+    pub fn generate_and_report_tab_state(&mut self) -> Result<Vec<TabInfo>> {
         let mut plugin_updates = vec![];
+        let mut tab_infos_for_screen_state = BTreeMap::new();
+        for tab in self.tabs.values() {
+            let all_focused_clients: Vec<ClientId> = self
+                .active_tab_indices
+                .iter()
+                .filter(|(_c_id, tab_position)| **tab_position == tab.index)
+                .map(|(c_id, _)| c_id)
+                .copied()
+                .collect();
+            let (active_swap_layout_name, is_swap_layout_dirty) = tab.swap_layout_info();
+            let tab_info_for_screen = TabInfo {
+                position: tab.position,
+                name: tab.name.clone(),
+                active: self.active_tab_indices.values().any(|i| i == &tab.index),
+                panes_to_hide: tab.panes_to_hide_count(),
+                is_fullscreen_active: tab.is_fullscreen_active(),
+                is_sync_panes_active: tab.is_sync_panes_active(),
+                are_floating_panes_visible: tab.are_floating_panes_visible(),
+                other_focused_clients: all_focused_clients,
+                active_swap_layout_name,
+                is_swap_layout_dirty,
+            };
+            tab_infos_for_screen_state.insert(tab.position, tab_info_for_screen);
+        }
         for (client_id, active_tab_index) in self.active_tab_indices.iter() {
-            let mut tab_data = vec![];
+            let mut plugin_tab_updates = vec![];
             for tab in self.tabs.values() {
                 let other_focused_clients: Vec<ClientId> = if self.session_is_mirrored {
                     vec![]
@@ -1258,7 +1300,7 @@ impl Screen {
                         .collect()
                 };
                 let (active_swap_layout_name, is_swap_layout_dirty) = tab.swap_layout_info();
-                tab_data.push(TabInfo {
+                let tab_info_for_plugins = TabInfo {
                     position: tab.position,
                     name: tab.name.clone(),
                     active: *active_tab_index == tab.index,
@@ -1269,17 +1311,18 @@ impl Screen {
                     other_focused_clients,
                     active_swap_layout_name,
                     is_swap_layout_dirty,
-                });
+                };
+                plugin_tab_updates.push(tab_info_for_plugins);
             }
-            plugin_updates.push((None, Some(*client_id), Event::TabUpdate(tab_data)));
+            plugin_updates.push((None, Some(*client_id), Event::TabUpdate(plugin_tab_updates)));
         }
         self.bus
             .senders
             .send_to_plugin(PluginInstruction::Update(plugin_updates))
             .context("failed to update tabs")?;
-        Ok(())
+        Ok(tab_infos_for_screen_state.values().cloned().collect())
     }
-    fn report_pane_state(&self) -> Result<()> {
+    fn generate_and_report_pane_state(&mut self) -> Result<PaneManifest> {
         let mut pane_manifest = PaneManifest::default();
         for tab in self.tabs.values() {
             pane_manifest.panes.insert(tab.position, tab.pane_infos());
@@ -1289,9 +1332,51 @@ impl Screen {
             .send_to_plugin(PluginInstruction::Update(vec![(
                 None,
                 None,
-                Event::PaneUpdate(pane_manifest),
+                Event::PaneUpdate(pane_manifest.clone()),
             )]))
             .context("failed to update tabs")?;
+
+        Ok(pane_manifest)
+    }
+    fn log_and_report_session_state(&mut self) -> Result<()> {
+        let err_context = || format!("Failed to log and report session state");
+        // generate own session info
+        let pane_manifest = self.generate_and_report_pane_state()?;
+        let tab_infos = self.generate_and_report_tab_state()?;
+        let session_info = SessionInfo {
+            name: self.session_name.clone(),
+            tabs: tab_infos,
+            panes: pane_manifest,
+            connected_clients: self.active_tab_indices.keys().len(),
+            is_current_session: true,
+        };
+        self.bus
+            .senders
+            .send_to_background_jobs(BackgroundJob::ReportSessionInfo(
+                self.session_name.to_owned(),
+                session_info,
+            ))
+            .with_context(err_context)?;
+        self.bus
+            .senders
+            .send_to_background_jobs(BackgroundJob::ReadAllSessionInfosOnMachine)
+            .with_context(err_context)?;
+
+        Ok(())
+    }
+    pub fn update_session_infos(
+        &mut self,
+        new_session_infos: BTreeMap<String, SessionInfo>,
+    ) -> Result<()> {
+        self.session_infos_on_machine = new_session_infos;
+        self.bus
+            .senders
+            .send_to_plugin(PluginInstruction::Update(vec![(
+                None,
+                None,
+                Event::SessionUpdate(self.session_infos_on_machine.values().cloned().collect()),
+            )]))
+            .context("failed to update session info")?;
         Ok(())
     }
 
@@ -1327,7 +1412,8 @@ impl Screen {
                                 }
                             },
                         }
-                        self.report_tab_state().with_context(err_context)
+                        self.log_and_report_session_state()
+                            .with_context(err_context)
                     },
                     Err(err) => {
                         Err::<(), _>(err).with_context(err_context).non_fatal();
@@ -1352,7 +1438,7 @@ impl Screen {
                     Ok(active_tab) => {
                         if active_tab.name != active_tab.prev_name {
                             active_tab.name = active_tab.prev_name.clone();
-                            self.report_tab_state()
+                            self.log_and_report_session_state()
                                 .context("failed to undo renaming of active tab")?;
                         }
                     },
@@ -1473,7 +1559,8 @@ impl Screen {
                 Err(err) => Err::<(), _>(err).with_context(err_context).non_fatal(),
             };
         }
-        self.report_pane_state().with_context(err_context)?;
+        self.log_and_report_session_state()
+            .with_context(err_context)?;
         Ok(())
     }
     pub fn move_focus_right_or_next_tab(&mut self, client_id: ClientId) -> Result<()> {
@@ -1508,7 +1595,8 @@ impl Screen {
                 Err(err) => Err::<(), _>(err).with_context(err_context).non_fatal(),
             };
         }
-        self.report_pane_state().with_context(err_context)?;
+        self.log_and_report_session_state()
+            .with_context(err_context)?;
         Ok(())
     }
     pub fn toggle_tab(&mut self, client_id: ClientId) -> Result<()> {
@@ -1521,8 +1609,8 @@ impl Screen {
                 .context("failed to toggle tabs")?;
         };
 
-        self.report_tab_state().context("failed to toggle tabs")?;
+        self.log_and_report_session_state()
-        self.report_pane_state().context("failed to toggle tabs")?;
+            .context("failed to toggle tabs")?;
         self.render()
     }
 
@@ -1550,7 +1638,8 @@ impl Screen {
                     .with_context(err_context)?
                     .focus_pane_with_id(plugin_pane_id, should_float, client_id)
                     .context("failed to focus plugin pane")?;
-                self.report_pane_state().with_context(err_context)?;
+                self.log_and_report_session_state()
+                    .with_context(err_context)?;
                 Ok(true)
             },
             None => Ok(false),
@@ -1684,8 +1773,7 @@ impl Screen {
                 new_active_tab.add_tiled_pane(active_pane, active_pane_id, Some(client_id))?;
             }
 
-            self.report_tab_state()?;
+            self.log_and_report_session_state()?;
-            self.report_pane_state()?;
         } else {
             let active_pane_id = {
                 let active_tab = self.get_active_tab_mut(client_id)?;
@@ -1843,8 +1931,7 @@ pub(crate) fn screen_thread_main(
                     },
                 };
                 screen.unblock_input()?;
-                screen.report_tab_state()?;
+                screen.log_and_report_session_state()?;
-                screen.report_pane_state()?;
 
                 screen.render()?;
             },
@@ -1852,8 +1939,7 @@ pub(crate) fn screen_thread_main(
                 active_tab!(screen, client_id, |tab: &mut Tab| tab
                     .suppress_active_pane(pid, client_id), ?);
                 screen.unblock_input()?;
-                screen.report_tab_state()?;
+                screen.log_and_report_session_state()?;
-                screen.report_pane_state()?;
 
                 screen.render()?;
             },
@@ -1861,8 +1947,7 @@ pub(crate) fn screen_thread_main(
                 active_tab_and_connected_client_id!(screen, client_id, |tab: &mut Tab, client_id: ClientId| tab
                     .toggle_pane_embed_or_floating(client_id), ?);
                 screen.unblock_input()?;
-                screen.report_tab_state()?; // update tabs so that the ui indication will be send to the plugins
+                screen.log_and_report_session_state()?;
-                screen.report_pane_state()?;
 
                 screen.render()?;
             },
@@ -1870,8 +1955,7 @@ pub(crate) fn screen_thread_main(
                 active_tab_and_connected_client_id!(screen, client_id, |tab: &mut Tab, client_id: ClientId| tab
                     .toggle_floating_panes(Some(client_id), default_shell), ?);
                 screen.unblock_input()?;
-                screen.report_tab_state()?; // update tabs so that the ui indication will be send to the plugins
+                screen.log_and_report_session_state()?;
-                screen.report_pane_state()?;
 
                 screen.render()?;
             },
@@ -1901,8 +1985,7 @@ pub(crate) fn screen_thread_main(
                     );
                 }
                 screen.unblock_input()?;
-                screen.report_tab_state()?;
+                screen.log_and_report_session_state()?;
-                screen.report_pane_state()?;
                 screen.render()?;
             },
             ScreenInstruction::VerticalSplit(
@@ -1931,8 +2014,7 @@ pub(crate) fn screen_thread_main(
                     );
                 }
                 screen.unblock_input()?;
-                screen.report_tab_state()?;
+                screen.log_and_report_session_state()?;
-                screen.report_pane_state()?;
                 screen.render()?;
             },
             ScreenInstruction::WriteCharacter(bytes, client_id) => {
@@ -1953,8 +2035,7 @@ pub(crate) fn screen_thread_main(
                     ?
                 );
                 if state_changed {
-                    screen.report_tab_state()?;
+                    screen.log_and_report_session_state()?;
-                    screen.report_pane_state()?;
                 }
             },
             ScreenInstruction::Resize(client_id, strategy) => {
@@ -1966,8 +2047,7 @@ pub(crate) fn screen_thread_main(
                 );
                 screen.unblock_input()?;
                 screen.render()?;
-                screen.report_tab_state()?;
+                screen.log_and_report_session_state()?;
-                screen.report_pane_state()?;
             },
             ScreenInstruction::SwitchFocus(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -1977,7 +2057,7 @@ pub(crate) fn screen_thread_main(
                 );
                 screen.unblock_input()?;
                 screen.render()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::FocusNextPane(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -1996,7 +2076,7 @@ pub(crate) fn screen_thread_main(
                 );
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::MoveFocusLeft(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2007,13 +2087,13 @@ pub(crate) fn screen_thread_main(
                 );
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::MoveFocusLeftOrPreviousTab(client_id) => {
                 screen.move_focus_left_or_previous_tab(client_id)?;
                 screen.unblock_input()?;
                 screen.render()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::MoveFocusDown(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2024,7 +2104,7 @@ pub(crate) fn screen_thread_main(
                 );
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::MoveFocusRight(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2035,13 +2115,13 @@ pub(crate) fn screen_thread_main(
                 );
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::MoveFocusRightOrNextTab(client_id) => {
                 screen.move_focus_right_or_next_tab(client_id)?;
                 screen.unblock_input()?;
                 screen.render()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::MoveFocusUp(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2052,7 +2132,7 @@ pub(crate) fn screen_thread_main(
                 );
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::ClearScreen(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2088,7 +2168,7 @@ pub(crate) fn screen_thread_main(
                     ?
                 );
                 screen.render()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::ScrollUp(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2105,10 +2185,9 @@ pub(crate) fn screen_thread_main(
                     client_id,
                     |tab: &mut Tab, client_id: ClientId| tab.move_active_pane(client_id)
                 );
-                screen.report_tab_state()?; // update tabs so that the ui indication will be send to the plugins
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::MovePaneBackwards(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2116,10 +2195,9 @@ pub(crate) fn screen_thread_main(
                     client_id,
                     |tab: &mut Tab, client_id: ClientId| tab.move_active_pane_backwards(client_id)
                 );
-                screen.report_tab_state()?; // update tabs so that the ui indication will be send to the plugins
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::MovePaneDown(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2127,10 +2205,9 @@ pub(crate) fn screen_thread_main(
                     client_id,
                     |tab: &mut Tab, client_id: ClientId| tab.move_active_pane_down(client_id)
                 );
-                screen.report_tab_state()?; // update tabs so that the ui indication will be send to the plugins
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::MovePaneUp(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2138,10 +2215,9 @@ pub(crate) fn screen_thread_main(
                     client_id,
                     |tab: &mut Tab, client_id: ClientId| tab.move_active_pane_up(client_id)
                 );
-                screen.report_tab_state()?; // update tabs so that the ui indication will be send to the plugins
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::MovePaneRight(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2149,10 +2225,9 @@ pub(crate) fn screen_thread_main(
                     client_id,
                     |tab: &mut Tab, client_id: ClientId| tab.move_active_pane_right(client_id)
                 );
-                screen.report_tab_state()?; // update tabs so that the ui indication will be send to the plugins
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::MovePaneLeft(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2160,10 +2235,9 @@ pub(crate) fn screen_thread_main(
                     client_id,
                     |tab: &mut Tab, client_id: ClientId| tab.move_active_pane_left(client_id)
                 );
-                screen.report_tab_state()?; // update tabs so that the ui indication will be send to the plugins
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::ScrollUpAt(point, client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2270,10 +2344,9 @@ pub(crate) fn screen_thread_main(
                     client_id,
                     |tab: &mut Tab, client_id: ClientId| tab.close_focused_pane(client_id), ?
                 );
-                screen.report_tab_state()?;
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::SetSelectable(id, selectable, tab_index) => {
                 screen.get_indexed_tab_mut(tab_index).map_or_else(
@@ -2288,7 +2361,7 @@ pub(crate) fn screen_thread_main(
                 );
 
                 screen.render()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::ClosePane(id, client_id) => {
                 match client_id {
@@ -2308,9 +2381,8 @@ pub(crate) fn screen_thread_main(
                         }
                     },
                 }
-                screen.report_tab_state()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::HoldPane(id, exit_status, run_command, tab_index, client_id) => {
                 let is_first_run = false;
@@ -2339,9 +2411,8 @@ pub(crate) fn screen_thread_main(
                         }
                     },
                 }
-                screen.report_tab_state()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::UpdatePaneName(c, client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2351,7 +2422,7 @@ pub(crate) fn screen_thread_main(
                 );
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::UndoRenamePane(client_id) => {
                 active_tab_and_connected_client_id!(
@@ -2369,10 +2440,9 @@ pub(crate) fn screen_thread_main(
                     |tab: &mut Tab, client_id: ClientId| tab
                         .toggle_active_pane_fullscreen(client_id)
                 );
-                screen.report_tab_state()?;
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::TogglePaneFrames => {
                 screen.draw_pane_frames = !screen.draw_pane_frames;
@@ -2381,7 +2451,7 @@ pub(crate) fn screen_thread_main(
                 }
                 screen.render()?;
                 screen.unblock_input()?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::SwitchTabNext(client_id) => {
                 screen.switch_tab_next(None, true, client_id)?;
@@ -2529,7 +2599,7 @@ pub(crate) fn screen_thread_main(
             },
             ScreenInstruction::TerminalResize(new_size) => {
                 screen.resize_to_screen(new_size)?;
-                screen.report_tab_state()?; // update tabs so that the ui indication will be send to the plugins
+                screen.log_and_report_session_state()?; // update tabs so that the ui indication will be send to the plugins
                 screen.render()?;
             },
             ScreenInstruction::TerminalPixelDimensions(pixel_dimensions) => {
@@ -2560,31 +2630,28 @@ pub(crate) fn screen_thread_main(
                     client_id,
                     |tab: &mut Tab, _client_id: ClientId| tab.toggle_sync_panes_is_active()
                 );
-                screen.report_tab_state()?;
+                screen.log_and_report_session_state()?;
                 screen.render()?;
                 screen.unblock_input()?;
             },
             ScreenInstruction::LeftClick(point, client_id) => {
                 active_tab!(screen, client_id, |tab: &mut Tab| tab
                     .handle_left_click(&point, client_id), ?);
-                screen.report_tab_state()?;
+                screen.log_and_report_session_state()?;
-                screen.report_pane_state()?;
                 screen.render()?;
                 screen.unblock_input()?;
             },
             ScreenInstruction::RightClick(point, client_id) => {
                 active_tab!(screen, client_id, |tab: &mut Tab| tab
                     .handle_right_click(&point, client_id), ?);
-                screen.report_tab_state()?;
+                screen.log_and_report_session_state()?;
-                screen.report_pane_state()?;
                 screen.render()?;
                 screen.unblock_input()?;
             },
             ScreenInstruction::MiddleClick(point, client_id) => {
                 active_tab!(screen, client_id, |tab: &mut Tab| tab
                     .handle_middle_click(&point, client_id), ?);
-                screen.report_tab_state()?;
+                screen.log_and_report_session_state()?;
-                screen.report_pane_state()?;
                 screen.render()?;
                 screen.unblock_input()?;
             },
@@ -2632,15 +2699,26 @@ pub(crate) fn screen_thread_main(
                 screen.unblock_input()?;
                 screen.render()?;
             },
-            ScreenInstruction::AddClient(client_id) => {
+            ScreenInstruction::AddClient(client_id, tab_position_to_focus, pane_id_to_focus) => {
                 screen.add_client(client_id)?;
-                screen.report_tab_state()?;
+                let pane_id = pane_id_to_focus.map(|(pane_id, is_plugin)| {
-                screen.report_pane_state()?;
+                    if is_plugin {
+                        PaneId::Plugin(pane_id)
+                    } else {
+                        PaneId::Terminal(pane_id)
+                    }
+                });
+                if let Some(pane_id) = pane_id {
+                    screen.focus_pane_with_id(pane_id, true, client_id)?;
+                } else if let Some(tab_position_to_focus) = tab_position_to_focus {
+                    screen.go_to_tab(tab_position_to_focus, client_id)?;
+                }
+                screen.log_and_report_session_state()?;
                 screen.render()?;
             },
             ScreenInstruction::RemoveClient(client_id) => {
                 screen.remove_client(client_id)?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
                 screen.render()?;
             },
             ScreenInstruction::AddOverlay(overlay, _client_id) => {
@@ -2755,8 +2833,7 @@ pub(crate) fn screen_thread_main(
                     ?
                 );
                 screen.render()?;
-                screen.report_tab_state()?;
+                screen.log_and_report_session_state()?;
-                screen.report_pane_state()?;
                 screen.unblock_input()?;
             },
             ScreenInstruction::NextSwapLayout(client_id) => {
@@ -2767,8 +2844,7 @@ pub(crate) fn screen_thread_main(
                     ?
                 );
                 screen.render()?;
-                screen.report_tab_state()?;
+                screen.log_and_report_session_state()?;
-                screen.report_pane_state()?;
                 screen.unblock_input()?;
             },
             ScreenInstruction::QueryTabNames(client_id) => {
@@ -2852,7 +2928,7 @@ pub(crate) fn screen_thread_main(
                 } else {
                     log::error!("Tab index not found: {:?}", tab_index);
                 }
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
                 screen.unblock_input()?;
             },
             ScreenInstruction::UpdatePluginLoadingStage(pid, loading_indication) => {
@@ -2890,8 +2966,7 @@ pub(crate) fn screen_thread_main(
                 for tab in all_tabs.values_mut() {
                     tab.update_input_modes()?;
                 }
-                screen.report_tab_state()?;
+                screen.log_and_report_session_state()?;
-                screen.report_pane_state()?;
                 screen.render()?;
             },
             ScreenInstruction::LaunchOrFocusPlugin(run_plugin, should_float, client_id) => {
@@ -2910,7 +2985,7 @@ pub(crate) fn screen_thread_main(
                     Some((tab_index, client_id)) => {
                         if screen.focus_plugin_pane(&run_plugin, should_float, client_id)? {
                             screen.render()?;
-                            screen.report_pane_state()?;
+                            screen.log_and_report_session_state()?;
                         } else {
                             screen.bus.senders.send_to_plugin(PluginInstruction::Load(
                                 Some(should_float),
@@ -2934,12 +3009,11 @@ pub(crate) fn screen_thread_main(
                         break;
                     }
                 }
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::FocusPaneWithId(pane_id, should_float_if_hidden, client_id) => {
                 screen.focus_pane_with_id(pane_id, should_float_if_hidden, client_id)?;
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
-                screen.report_tab_state()?;
             },
             ScreenInstruction::RenamePane(pane_id, new_name) => {
                 let all_tabs = screen.get_tabs_mut();
@@ -2952,7 +3026,7 @@ pub(crate) fn screen_thread_main(
                         break;
                     }
                 }
-                screen.report_pane_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::RenameTab(tab_index, new_name) => {
                 match screen.tabs.get_mut(&tab_index.saturating_sub(1)) {
@@ -2963,7 +3037,7 @@ pub(crate) fn screen_thread_main(
                         log::error!("Failed to find tab with index: {:?}", tab_index);
                     },
                 }
-                screen.report_tab_state()?;
+                screen.log_and_report_session_state()?;
             },
             ScreenInstruction::RequestPluginPermissions(plugin_id, plugin_permission) => {
                 let all_tabs = screen.get_tabs_mut();
@@ -2992,6 +3066,9 @@ pub(crate) fn screen_thread_main(
             ScreenInstruction::BreakPaneLeft(client_id) => {
                 screen.break_pane_to_new_tab(Direction::Left, client_id)?;
             },
+            ScreenInstruction::UpdateSessionInfos(new_session_infos) => {
+                screen.update_session_infos(new_session_infos)?;
+            },
         }
     }
     Ok(())

zellij-server/src/tab/mod.rs

@@ -3328,6 +3328,7 @@ impl Tab {
         // this function is to be preferred to directly invoking floating_panes.toggle_show_panes(true)
         self.floating_panes.toggle_show_panes(true);
         self.tiled_panes.unfocus_all_panes();
+        self.set_force_render();
     }
 
     pub fn hide_floating_panes(&mut self) {
@@ -3335,6 +3336,7 @@ impl Tab {
         // floating_panes.toggle_show_panes(false)
         self.floating_panes.toggle_show_panes(false);
         self.tiled_panes.focus_all_panes();
+        self.set_force_render();
     }
 
     pub fn find_plugin(&self, run_plugin: &RunPlugin) -> Option<PaneId> {
@@ -3359,6 +3361,7 @@ impl Tab {
         // TODO: should error if pane is not selectable
         self.tiled_panes
             .focus_pane_if_exists(pane_id, client_id)
+            .map(|_| self.hide_floating_panes())
             .or_else(|_| {
                 let focused_floating_pane =
                     self.floating_panes.focus_pane_if_exists(pane_id, client_id);

zellij-tile/src/shim.rs

@@ -563,6 +563,34 @@ where
     unsafe { host_run_plugin_command() };
 }
 
+/// Switch to a session with the given name, create one if no name is given
+pub fn switch_session(name: Option<&str>) {
+    let plugin_command = PluginCommand::SwitchSession(ConnectToSession {
+        name: name.map(|n| n.to_string()),
+        ..Default::default()
+    });
+    let protobuf_plugin_command: ProtobufPluginCommand = plugin_command.try_into().unwrap();
+    object_to_stdout(&protobuf_plugin_command.encode_to_vec());
+    unsafe { host_run_plugin_command() };
+}
+
+/// Switch to a session with the given name, focusing either the provided pane_id or the provided
+/// tab position (in that order)
+pub fn switch_session_with_focus(
+    name: &str,
+    tab_position: Option<usize>,
+    pane_id: Option<(u32, bool)>,
+) {
+    let plugin_command = PluginCommand::SwitchSession(ConnectToSession {
+        name: Some(name.to_owned()),
+        tab_position,
+        pane_id,
+    });
+    let protobuf_plugin_command: ProtobufPluginCommand = plugin_command.try_into().unwrap();
+    object_to_stdout(&protobuf_plugin_command.encode_to_vec());
+    unsafe { host_run_plugin_command() };
+}
+
 // Utility Functions
 
 /// Returns the `TabInfo` corresponding to the currently active tab

zellij-utils/assets/config/default.kdl

@@ -113,6 +113,12 @@ keybinds {
         bind "Ctrl o" { SwitchToMode "Normal"; }
         bind "Ctrl s" { SwitchToMode "Scroll"; }
         bind "d" { Detach; }
+        bind "w" {
+            LaunchOrFocusPlugin "zellij:session-manager" {
+                floating true
+            };
+            SwitchToMode "Normal"
+        }
     }
     tmux {
         bind "[" { SwitchToMode "Scroll"; }
@@ -181,6 +187,7 @@ plugins {
     status-bar { path "status-bar"; }
     strider { path "strider"; }
     compact-bar { path "compact-bar"; }
+    session-manager { path "session-manager"; }
 }
 
 // Choose what to do when zellij receives SIGTERM, SIGINT, SIGQUIT or SIGHUP

zellij-utils/src/consts.rs

@@ -38,6 +38,8 @@ lazy_static! {
         .join(format!("{}", Uuid::new_v4()));
     pub static ref ZELLIJ_PLUGIN_PERMISSIONS_CACHE: PathBuf =
         ZELLIJ_CACHE_DIR.join("permissions.kdl");
+    pub static ref ZELLIJ_SESSION_INFO_CACHE_DIR: PathBuf =
+        ZELLIJ_CACHE_DIR.join(VERSION).join("session_info");
 }
 
 pub const FEATURES: &[&str] = &[
@@ -92,6 +94,7 @@ mod not_wasm {
             add_plugin!(assets, "status-bar.wasm");
             add_plugin!(assets, "tab-bar.wasm");
             add_plugin!(assets, "strider.wasm");
+            add_plugin!(assets, "session-manager.wasm");
             assets
         };
     }
@@ -104,20 +107,13 @@ pub use unix_only::*;
 mod unix_only {
     use super::*;
     use crate::envs;
-    use crate::shared::set_permissions;
+    pub use crate::shared::set_permissions;
     use lazy_static::lazy_static;
     use nix::unistd::Uid;
-    use std::{env::temp_dir, fs};
+    use std::env::temp_dir;
 
     lazy_static! {
         static ref UID: Uid = Uid::current();
-        pub static ref ZELLIJ_IPC_PIPE: PathBuf = {
-            let mut sock_dir = ZELLIJ_SOCK_DIR.clone();
-            fs::create_dir_all(&sock_dir).unwrap();
-            set_permissions(&sock_dir, 0o700).unwrap();
-            sock_dir.push(envs::get_session_name().unwrap());
-            sock_dir
-        };
         pub static ref ZELLIJ_TMP_DIR: PathBuf = temp_dir().join(format!("zellij-{}", *UID));
         pub static ref ZELLIJ_TMP_LOG_DIR: PathBuf = ZELLIJ_TMP_DIR.join("zellij-log");
         pub static ref ZELLIJ_TMP_LOG_FILE: PathBuf = ZELLIJ_TMP_LOG_DIR.join("zellij.log");

zellij-utils/src/data.rs

@@ -495,6 +495,7 @@ pub enum Event {
     FileSystemDelete(Vec<PathBuf>),
     /// A Result of plugin permission request
     PermissionRequestResult(PermissionStatus),
+    SessionUpdate(Vec<SessionInfo>),
 }
 
 #[derive(
@@ -734,6 +735,42 @@ impl ModeInfo {
     }
 }
 
+#[derive(Debug, Default, Clone, PartialEq, Eq, Deserialize, Serialize)]
+pub struct SessionInfo {
+    pub name: String,
+    pub tabs: Vec<TabInfo>,
+    pub panes: PaneManifest,
+    pub connected_clients: usize,
+    pub is_current_session: bool,
+}
+
+use std::hash::{Hash, Hasher};
+
+#[allow(clippy::derive_hash_xor_eq)]
+impl Hash for SessionInfo {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.name.hash(state);
+    }
+}
+
+impl SessionInfo {
+    pub fn new(name: String) -> Self {
+        SessionInfo {
+            name,
+            ..Default::default()
+        }
+    }
+    pub fn update_tab_info(&mut self, new_tab_info: Vec<TabInfo>) {
+        self.tabs = new_tab_info;
+    }
+    pub fn update_pane_info(&mut self, new_pane_info: PaneManifest) {
+        self.panes = new_pane_info;
+    }
+    pub fn update_connected_clients(&mut self, new_connected_clients: usize) {
+        self.connected_clients = new_connected_clients;
+    }
+}
+
 /// Contains all the information for a currently opened tab.
 #[derive(Debug, Default, Clone, PartialEq, Eq, Hash, Deserialize, Serialize)]
 pub struct TabInfo {
@@ -921,6 +958,13 @@ impl CommandToRun {
     }
 }
 
+#[derive(Debug, Default, Clone, Serialize, Deserialize)]
+pub struct ConnectToSession {
+    pub name: Option<String>,
+    pub tab_position: Option<usize>,
+    pub pane_id: Option<(u32, bool)>, // (id, is_plugin)
+}
+
 #[derive(Debug, Default, Clone)]
 pub struct PluginMessage {
     pub name: String,
@@ -1016,4 +1060,5 @@ pub enum PluginCommand {
     RenameTab(u32, String),          // tab index, new name
     ReportPanic(String),             // stringified panic
     RequestPluginPermissions(Vec<PermissionType>),
+    SwitchSession(ConnectToSession),
 }

zellij-utils/src/errors.rs

@@ -342,6 +342,7 @@ pub enum ScreenContext {
     BreakPane,
     BreakPaneRight,
     BreakPaneLeft,
+    UpdateSessionInfos,
 }
 
 /// Stack call representations corresponding to the different types of [`PtyInstruction`]s.
@@ -396,6 +397,7 @@ pub enum ClientContext {
     OwnClientId,
     StartedParsingStdinQuery,
     DoneParsingStdinQuery,
+    SwitchSession,
 }
 
 /// Stack call representations corresponding to the different types of [`ServerInstruction`]s.
@@ -413,6 +415,7 @@ pub enum ServerContext {
     ConnStatus,
     ActiveClients,
     Log,
+    SwitchSession,
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
@@ -429,6 +432,8 @@ pub enum BackgroundJobContext {
     DisplayPaneError,
     AnimatePluginLoading,
     StopPluginLoadingAnimation,
+    ReadAllSessionInfosOnMachine,
+    ReportSessionInfo,
     Exit,
 }
 

zellij-utils/src/input/permission.rs

@@ -27,13 +27,17 @@ impl PermissionCache {
     pub fn check_permissions(
         &self,
         plugin_name: String,
-        permissions: &Vec<PermissionType>,
+        permissions_to_check: &Vec<PermissionType>,
     ) -> bool {
         if let Some(target) = self.granted.get(&plugin_name) {
-            if target == permissions {
+            let mut all_granted = true;
-                return true;
+            for permission in permissions_to_check {
+                if !target.contains(permission) {
+                    all_granted = false;
                 }
             }
+            return all_granted;
+        }
 
         false
     }
@@ -43,7 +47,10 @@ impl PermissionCache {
 
         let granted = match fs::read_to_string(cache_path.clone()) {
             Ok(raw_string) => PermissionCache::from_string(raw_string).unwrap_or_default(),
-            Err(_) => GrantedPermission::default(),
+            Err(e) => {
+                log::error!("Failed to read permission cache file: {}", e);
+                GrantedPermission::default()
+            },
         };
 
         PermissionCache {

zellij-utils/src/ipc.rs

@@ -1,7 +1,7 @@
 //! IPC stuff for starting to split things into a client and server model.
 use crate::{
     cli::CliArgs,
-    data::{ClientId, InputMode, Style},
+    data::{ClientId, ConnectToSession, InputMode, Style},
     errors::{get_current_ctx, prelude::*, ErrorContext},
     input::keybinds::Keybinds,
     input::{actions::Action, layout::Layout, options::Options, plugins::PluginsConfig},
@@ -65,16 +65,6 @@ impl PixelDimensions {
 #[allow(clippy::large_enum_variant)]
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub enum ClientToServerMsg {
-    /*// List which sessions are available
-    ListSessions,
-    // Create a new session
-    CreateSession,
-    // Attach to a running session
-    AttachToSession(SessionId, ClientType),
-    // Force detach
-    DetachSession(SessionId),
-    // Disconnect from the session we're connected to
-    DisconnectFromSession,*/
     DetachSession(Vec<ClientId>),
     TerminalPixelDimensions(PixelDimensions),
     BackgroundColor(String),
@@ -88,7 +78,12 @@ pub enum ClientToServerMsg {
         Box<Layout>,
         Option<PluginsConfig>,
     ),
-    AttachClient(ClientAttributes, Options),
+    AttachClient(
+        ClientAttributes,
+        Options,
+        Option<usize>,       // tab position to focus
+        Option<(u32, bool)>, // (pane_id, is_plugin) => pane id to focus
+    ),
     Action(Action, Option<ClientId>),
     ClientExited,
     KillSession,
@@ -99,10 +94,6 @@ pub enum ClientToServerMsg {
 // Types of messages sent from the server to the client
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub enum ServerToClientMsg {
-    /*// Info about a particular session
-    SessionInfo(Session),
-    // A list of sessions
-    SessionList(HashSet<Session>),*/
     Render(String),
     UnblockInputThread,
     Exit(ExitReason),
@@ -110,6 +101,7 @@ pub enum ServerToClientMsg {
     Connected,
     ActiveClients(Vec<ClientId>),
     Log(Vec<String>),
+    SwitchSession(ConnectToSession),
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone)]

zellij-utils/src/kdl/mod.rs

@@ -1,5 +1,8 @@
 mod kdl_layout_parser;
-use crate::data::{Direction, InputMode, Key, Palette, PaletteColor, PermissionType, Resize};
+use crate::data::{
+    Direction, InputMode, Key, Palette, PaletteColor, PaneInfo, PaneManifest, PermissionType,
+    Resize, SessionInfo, TabInfo,
+};
 use crate::envs::EnvironmentVariables;
 use crate::input::config::{Config, ConfigError, KdlError};
 use crate::input::keybinds::Keybinds;
@@ -325,7 +328,6 @@ macro_rules! actions_from_kdl {
 pub fn kdl_arguments_that_are_strings<'a>(
     arguments: impl Iterator<Item = &'a KdlEntry>,
 ) -> Result<Vec<String>, ConfigError> {
-    // pub fn kdl_arguments_that_are_strings <'a>(arguments: impl Iterator<Item=&'a KdlValue>) -> Result<Vec<String>, ConfigError> {
     let mut args: Vec<String> = vec![];
     for kdl_entry in arguments {
         match kdl_entry.value().as_string() {
@@ -1841,6 +1843,419 @@ impl PermissionCache {
     }
 }
 
+impl SessionInfo {
+    pub fn from_string(raw_session_info: &str, current_session_name: &str) -> Result<Self, String> {
+        let kdl_document: KdlDocument = raw_session_info
+            .parse()
+            .map_err(|e| format!("Failed to parse kdl document: {}", e))?;
+        let name = kdl_document
+            .get("name")
+            .and_then(|n| n.entries().iter().next())
+            .and_then(|e| e.value().as_string())
+            .map(|s| s.to_owned())
+            .ok_or("Failed to parse session name")?;
+        let connected_clients = kdl_document
+            .get("connected_clients")
+            .and_then(|n| n.entries().iter().next())
+            .and_then(|e| e.value().as_i64())
+            .map(|c| c as usize)
+            .ok_or("Failed to parse connected_clients")?;
+        let tabs: Vec<TabInfo> = kdl_document
+            .get("tabs")
+            .and_then(|t| t.children())
+            .and_then(|c| {
+                let mut tab_nodes = vec![];
+                for tab_node in c.nodes() {
+                    if let Some(tab) = tab_node.children() {
+                        tab_nodes.push(TabInfo::decode_from_kdl(tab).ok()?);
+                    }
+                }
+                Some(tab_nodes)
+            })
+            .ok_or("Failed to parse tabs")?;
+        let panes: PaneManifest = kdl_document
+            .get("panes")
+            .and_then(|p| p.children())
+            .map(|p| PaneManifest::decode_from_kdl(p))
+            .ok_or("Failed to parse panes")?;
+        let is_current_session = name == current_session_name;
+        Ok(SessionInfo {
+            name,
+            tabs,
+            panes,
+            connected_clients,
+            is_current_session,
+        })
+    }
+    pub fn to_string(&self) -> String {
+        let mut kdl_document = KdlDocument::new();
+
+        let mut name = KdlNode::new("name");
+        name.push(self.name.clone());
+
+        let mut connected_clients = KdlNode::new("connected_clients");
+        connected_clients.push(self.connected_clients as i64);
+
+        let mut tabs = KdlNode::new("tabs");
+        let mut tab_children = KdlDocument::new();
+        for tab_info in &self.tabs {
+            let mut tab = KdlNode::new("tab");
+            let kdl_tab_info = tab_info.encode_to_kdl();
+            tab.set_children(kdl_tab_info);
+            tab_children.nodes_mut().push(tab);
+        }
+        tabs.set_children(tab_children);
+
+        let mut panes = KdlNode::new("panes");
+        panes.set_children(self.panes.encode_to_kdl());
+
+        kdl_document.nodes_mut().push(name);
+        kdl_document.nodes_mut().push(tabs);
+        kdl_document.nodes_mut().push(panes);
+        kdl_document.nodes_mut().push(connected_clients);
+        kdl_document.fmt();
+        kdl_document.to_string()
+    }
+}
+
+impl TabInfo {
+    pub fn decode_from_kdl(kdl_document: &KdlDocument) -> Result<Self, String> {
+        macro_rules! int_node {
+            ($name:expr, $type:ident) => {{
+                kdl_document
+                    .get($name)
+                    .and_then(|n| n.entries().iter().next())
+                    .and_then(|e| e.value().as_i64())
+                    .map(|e| e as $type)
+                    .ok_or(format!("Failed to parse tab {}", $name))?
+            }};
+        }
+        macro_rules! string_node {
+            ($name:expr) => {{
+                kdl_document
+                    .get($name)
+                    .and_then(|n| n.entries().iter().next())
+                    .and_then(|e| e.value().as_string())
+                    .map(|s| s.to_owned())
+                    .ok_or(format!("Failed to parse tab {}", $name))?
+            }};
+        }
+        macro_rules! optional_string_node {
+            ($name:expr) => {{
+                kdl_document
+                    .get($name)
+                    .and_then(|n| n.entries().iter().next())
+                    .and_then(|e| e.value().as_string())
+                    .map(|s| s.to_owned())
+            }};
+        }
+        macro_rules! bool_node {
+            ($name:expr) => {{
+                kdl_document
+                    .get($name)
+                    .and_then(|n| n.entries().iter().next())
+                    .and_then(|e| e.value().as_bool())
+                    .ok_or(format!("Failed to parse tab {}", $name))?
+            }};
+        }
+
+        let position = int_node!("position", usize);
+        let name = string_node!("name");
+        let active = bool_node!("active");
+        let panes_to_hide = int_node!("panes_to_hide", usize);
+        let is_fullscreen_active = bool_node!("is_fullscreen_active");
+        let is_sync_panes_active = bool_node!("is_sync_panes_active");
+        let are_floating_panes_visible = bool_node!("are_floating_panes_visible");
+        let mut other_focused_clients = vec![];
+        if let Some(tab_other_focused_clients) = kdl_document
+            .get("other_focused_clients")
+            .map(|n| n.entries())
+        {
+            for entry in tab_other_focused_clients {
+                if let Some(entry_parsed) = entry.value().as_i64() {
+                    other_focused_clients.push(entry_parsed as u16);
+                }
+            }
+        }
+        let active_swap_layout_name = optional_string_node!("active_swap_layout_name");
+        let is_swap_layout_dirty = bool_node!("is_swap_layout_dirty");
+        Ok(TabInfo {
+            position,
+            name,
+            active,
+            panes_to_hide,
+            is_fullscreen_active,
+            is_sync_panes_active,
+            are_floating_panes_visible,
+            other_focused_clients,
+            active_swap_layout_name,
+            is_swap_layout_dirty,
+        })
+    }
+    pub fn encode_to_kdl(&self) -> KdlDocument {
+        let mut kdl_doucment = KdlDocument::new();
+
+        let mut position = KdlNode::new("position");
+        position.push(self.position as i64);
+        kdl_doucment.nodes_mut().push(position);
+
+        let mut name = KdlNode::new("name");
+        name.push(self.name.clone());
+        kdl_doucment.nodes_mut().push(name);
+
+        let mut active = KdlNode::new("active");
+        active.push(self.active);
+        kdl_doucment.nodes_mut().push(active);
+
+        let mut panes_to_hide = KdlNode::new("panes_to_hide");
+        panes_to_hide.push(self.panes_to_hide as i64);
+        kdl_doucment.nodes_mut().push(panes_to_hide);
+
+        let mut is_fullscreen_active = KdlNode::new("is_fullscreen_active");
+        is_fullscreen_active.push(self.is_fullscreen_active);
+        kdl_doucment.nodes_mut().push(is_fullscreen_active);
+
+        let mut is_sync_panes_active = KdlNode::new("is_sync_panes_active");
+        is_sync_panes_active.push(self.is_sync_panes_active);
+        kdl_doucment.nodes_mut().push(is_sync_panes_active);
+
+        let mut are_floating_panes_visible = KdlNode::new("are_floating_panes_visible");
+        are_floating_panes_visible.push(self.are_floating_panes_visible);
+        kdl_doucment.nodes_mut().push(are_floating_panes_visible);
+
+        if !self.other_focused_clients.is_empty() {
+            let mut other_focused_clients = KdlNode::new("other_focused_clients");
+            for client_id in &self.other_focused_clients {
+                other_focused_clients.push(*client_id as i64);
+            }
+            kdl_doucment.nodes_mut().push(other_focused_clients);
+        }
+
+        if let Some(active_swap_layout_name) = self.active_swap_layout_name.as_ref() {
+            let mut active_swap_layout = KdlNode::new("active_swap_layout_name");
+            active_swap_layout.push(active_swap_layout_name.to_string());
+            kdl_doucment.nodes_mut().push(active_swap_layout);
+        }
+
+        let mut is_swap_layout_dirty = KdlNode::new("is_swap_layout_dirty");
+        is_swap_layout_dirty.push(self.is_swap_layout_dirty);
+        kdl_doucment.nodes_mut().push(is_swap_layout_dirty);
+
+        kdl_doucment
+    }
+}
+
+impl PaneManifest {
+    pub fn decode_from_kdl(kdl_doucment: &KdlDocument) -> Self {
+        let mut panes: HashMap<usize, Vec<PaneInfo>> = HashMap::new();
+        for node in kdl_doucment.nodes() {
+            if node.name().to_string() == "pane" {
+                if let Some(pane_document) = node.children() {
+                    if let Ok((tab_position, pane_info)) = PaneInfo::decode_from_kdl(pane_document)
+                    {
+                        let panes_in_tab_position =
+                            panes.entry(tab_position).or_insert_with(Vec::new);
+                        panes_in_tab_position.push(pane_info);
+                    }
+                }
+            }
+        }
+        PaneManifest { panes }
+    }
+    pub fn encode_to_kdl(&self) -> KdlDocument {
+        let mut kdl_doucment = KdlDocument::new();
+        for (tab_position, panes) in &self.panes {
+            for pane in panes {
+                let mut pane_node = KdlNode::new("pane");
+                let mut pane = pane.encode_to_kdl();
+
+                let mut position_node = KdlNode::new("tab_position");
+                position_node.push(*tab_position as i64);
+                pane.nodes_mut().push(position_node);
+
+                pane_node.set_children(pane);
+                kdl_doucment.nodes_mut().push(pane_node);
+            }
+        }
+        kdl_doucment
+    }
+}
+
+impl PaneInfo {
+    pub fn decode_from_kdl(kdl_document: &KdlDocument) -> Result<(usize, Self), String> {
+        // usize is the tab position
+        macro_rules! int_node {
+            ($name:expr, $type:ident) => {{
+                kdl_document
+                    .get($name)
+                    .and_then(|n| n.entries().iter().next())
+                    .and_then(|e| e.value().as_i64())
+                    .map(|e| e as $type)
+                    .ok_or(format!("Failed to parse pane {}", $name))?
+            }};
+        }
+        macro_rules! optional_int_node {
+            ($name:expr, $type:ident) => {{
+                kdl_document
+                    .get($name)
+                    .and_then(|n| n.entries().iter().next())
+                    .and_then(|e| e.value().as_i64())
+                    .map(|e| e as $type)
+            }};
+        }
+        macro_rules! bool_node {
+            ($name:expr) => {{
+                kdl_document
+                    .get($name)
+                    .and_then(|n| n.entries().iter().next())
+                    .and_then(|e| e.value().as_bool())
+                    .ok_or(format!("Failed to parse pane {}", $name))?
+            }};
+        }
+        macro_rules! string_node {
+            ($name:expr) => {{
+                kdl_document
+                    .get($name)
+                    .and_then(|n| n.entries().iter().next())
+                    .and_then(|e| e.value().as_string())
+                    .map(|s| s.to_owned())
+                    .ok_or(format!("Failed to parse pane {}", $name))?
+            }};
+        }
+        macro_rules! optional_string_node {
+            ($name:expr) => {{
+                kdl_document
+                    .get($name)
+                    .and_then(|n| n.entries().iter().next())
+                    .and_then(|e| e.value().as_string())
+                    .map(|s| s.to_owned())
+            }};
+        }
+        let tab_position = int_node!("tab_position", usize);
+        let id = int_node!("id", u32);
+
+        let is_plugin = bool_node!("is_plugin");
+        let is_focused = bool_node!("is_focused");
+        let is_fullscreen = bool_node!("is_fullscreen");
+        let is_floating = bool_node!("is_floating");
+        let is_suppressed = bool_node!("is_suppressed");
+        let title = string_node!("title");
+        let exited = bool_node!("exited");
+        let exit_status = optional_int_node!("exit_status", i32);
+        let is_held = bool_node!("is_held");
+        let pane_x = int_node!("pane_x", usize);
+        let pane_content_x = int_node!("pane_content_x", usize);
+        let pane_y = int_node!("pane_y", usize);
+        let pane_content_y = int_node!("pane_content_y", usize);
+        let pane_rows = int_node!("pane_rows", usize);
+        let pane_content_rows = int_node!("pane_content_rows", usize);
+        let pane_columns = int_node!("pane_columns", usize);
+        let pane_content_columns = int_node!("pane_content_columns", usize);
+        let cursor_coordinates_in_pane = kdl_document
+            .get("cursor_coordinates_in_pane")
+            .map(|n| {
+                let mut entries = n.entries().iter();
+                (entries.next(), entries.next())
+            })
+            .and_then(|(x, y)| {
+                let x = x.and_then(|x| x.value().as_i64()).map(|x| x as usize);
+                let y = y.and_then(|y| y.value().as_i64()).map(|y| y as usize);
+                match (x, y) {
+                    (Some(x), Some(y)) => Some((x, y)),
+                    _ => None,
+                }
+            });
+        let terminal_command = optional_string_node!("terminal_command");
+        let plugin_url = optional_string_node!("plugin_url");
+        let is_selectable = bool_node!("is_selectable");
+
+        let pane_info = PaneInfo {
+            id,
+            is_plugin,
+            is_focused,
+            is_fullscreen,
+            is_floating,
+            is_suppressed,
+            title,
+            exited,
+            exit_status,
+            is_held,
+            pane_x,
+            pane_content_x,
+            pane_y,
+            pane_content_y,
+            pane_rows,
+            pane_content_rows,
+            pane_columns,
+            pane_content_columns,
+            cursor_coordinates_in_pane,
+            terminal_command,
+            plugin_url,
+            is_selectable,
+        };
+        Ok((tab_position, pane_info))
+    }
+    pub fn encode_to_kdl(&self) -> KdlDocument {
+        let mut kdl_doucment = KdlDocument::new();
+        macro_rules! int_node {
+            ($name:expr, $val:expr) => {{
+                let mut att = KdlNode::new($name);
+                att.push($val as i64);
+                kdl_doucment.nodes_mut().push(att);
+            }};
+        }
+        macro_rules! bool_node {
+            ($name:expr, $val:expr) => {{
+                let mut att = KdlNode::new($name);
+                att.push($val);
+                kdl_doucment.nodes_mut().push(att);
+            }};
+        }
+        macro_rules! string_node {
+            ($name:expr, $val:expr) => {{
+                let mut att = KdlNode::new($name);
+                att.push($val);
+                kdl_doucment.nodes_mut().push(att);
+            }};
+        }
+
+        int_node!("id", self.id);
+        bool_node!("is_plugin", self.is_plugin);
+        bool_node!("is_focused", self.is_focused);
+        bool_node!("is_fullscreen", self.is_fullscreen);
+        bool_node!("is_floating", self.is_floating);
+        bool_node!("is_suppressed", self.is_suppressed);
+        string_node!("title", self.title.to_string());
+        bool_node!("exited", self.exited);
+        if let Some(exit_status) = self.exit_status {
+            int_node!("exit_status", exit_status);
+        }
+        bool_node!("is_held", self.is_held);
+        int_node!("pane_x", self.pane_x);
+        int_node!("pane_content_x", self.pane_content_x);
+        int_node!("pane_y", self.pane_y);
+        int_node!("pane_content_y", self.pane_content_y);
+        int_node!("pane_rows", self.pane_rows);
+        int_node!("pane_content_rows", self.pane_content_rows);
+        int_node!("pane_columns", self.pane_columns);
+        int_node!("pane_content_columns", self.pane_content_columns);
+        if let Some((cursor_x, cursor_y)) = self.cursor_coordinates_in_pane {
+            let mut cursor_coordinates_in_pane = KdlNode::new("cursor_coordinates_in_pane");
+            cursor_coordinates_in_pane.push(cursor_x as i64);
+            cursor_coordinates_in_pane.push(cursor_y as i64);
+            kdl_doucment.nodes_mut().push(cursor_coordinates_in_pane);
+        }
+        if let Some(terminal_command) = &self.terminal_command {
+            string_node!("terminal_command", terminal_command.to_string());
+        }
+        if let Some(plugin_url) = &self.plugin_url {
+            string_node!("plugin_url", plugin_url.to_string());
+        }
+        bool_node!("is_selectable", self.is_selectable);
+        kdl_doucment
+    }
+}
+
 pub fn parse_plugin_user_configuration(
     plugin_block: &KdlNode,
 ) -> Result<BTreeMap<String, String>, ConfigError> {
@@ -1888,3 +2303,104 @@ pub fn parse_plugin_user_configuration(
     }
     Ok(configuration)
 }
+
+#[test]
+fn serialize_and_deserialize_session_info() {
+    let session_info = SessionInfo::default();
+    let serialized = session_info.to_string();
+    let deserealized = SessionInfo::from_string(&serialized, "not this session").unwrap();
+    assert_eq!(session_info, deserealized);
+    insta::assert_snapshot!(serialized);
+}
+
+#[test]
+fn serialize_and_deserialize_session_info_with_data() {
+    let panes_list = vec![
+        PaneInfo {
+            id: 1,
+            is_plugin: false,
+            is_focused: true,
+            is_fullscreen: true,
+            is_floating: false,
+            is_suppressed: false,
+            title: "pane 1".to_owned(),
+            exited: false,
+            exit_status: None,
+            is_held: false,
+            pane_x: 0,
+            pane_content_x: 1,
+            pane_y: 0,
+            pane_content_y: 1,
+            pane_rows: 5,
+            pane_content_rows: 4,
+            pane_columns: 22,
+            pane_content_columns: 21,
+            cursor_coordinates_in_pane: Some((0, 0)),
+            terminal_command: Some("foo".to_owned()),
+            plugin_url: None,
+            is_selectable: true,
+        },
+        PaneInfo {
+            id: 1,
+            is_plugin: true,
+            is_focused: true,
+            is_fullscreen: true,
+            is_floating: false,
+            is_suppressed: false,
+            title: "pane 1".to_owned(),
+            exited: false,
+            exit_status: None,
+            is_held: false,
+            pane_x: 0,
+            pane_content_x: 1,
+            pane_y: 0,
+            pane_content_y: 1,
+            pane_rows: 5,
+            pane_content_rows: 4,
+            pane_columns: 22,
+            pane_content_columns: 21,
+            cursor_coordinates_in_pane: Some((0, 0)),
+            terminal_command: None,
+            plugin_url: Some("i_am_a_fake_plugin".to_owned()),
+            is_selectable: true,
+        },
+    ];
+    let mut panes = HashMap::new();
+    panes.insert(0, panes_list);
+    let session_info = SessionInfo {
+        name: "my session name".to_owned(),
+        tabs: vec![
+            TabInfo {
+                position: 0,
+                name: "tab 1".to_owned(),
+                active: true,
+                panes_to_hide: 1,
+                is_fullscreen_active: true,
+                is_sync_panes_active: false,
+                are_floating_panes_visible: true,
+                other_focused_clients: vec![2, 3],
+                active_swap_layout_name: Some("BASE".to_owned()),
+                is_swap_layout_dirty: true,
+            },
+            TabInfo {
+                position: 1,
+                name: "tab 2".to_owned(),
+                active: true,
+                panes_to_hide: 0,
+                is_fullscreen_active: false,
+                is_sync_panes_active: true,
+                are_floating_panes_visible: true,
+                other_focused_clients: vec![2, 3],
+                active_swap_layout_name: None,
+                is_swap_layout_dirty: false,
+            },
+        ],
+        panes: PaneManifest { panes },
+        connected_clients: 2,
+        is_current_session: false,
+    };
+    let serialized = session_info.to_string();
+    let deserealized = SessionInfo::from_string(&serialized, "not this session").unwrap();
+    assert_eq!(session_info, deserealized);
+    insta::assert_snapshot!(serialized);
+}

zellij-utils/src/kdl/snapshots/zellij_utils__kdl__serialize_and_deserialize_session_info.snap

@@ -0,0 +1,12 @@
+---
+source: zellij-utils/src/kdl/mod.rs
+assertion_line: 2284
+expression: serialized
+---
+name ""
+tabs {
+}
+panes {
+}
+connected_clients 0
+

zellij-utils/src/kdl/snapshots/zellij_utils__kdl__serialize_and_deserialize_session_info_with_data.snap

@@ -0,0 +1,81 @@
+---
+source: zellij-utils/src/kdl/mod.rs
+assertion_line: 2377
+expression: serialized
+---
+name "my session name"
+tabs {
+    tab {
+        position 0
+        name "tab 1"
+        active true
+        panes_to_hide 1
+        is_fullscreen_active true
+        is_sync_panes_active false
+        are_floating_panes_visible true
+        other_focused_clients 2 3
+        active_swap_layout_name "BASE"
+        is_swap_layout_dirty true
+    }
+    tab {
+        position 1
+        name "tab 2"
+        active true
+        panes_to_hide 0
+        is_fullscreen_active false
+        is_sync_panes_active true
+        are_floating_panes_visible true
+        other_focused_clients 2 3
+        is_swap_layout_dirty false
+    }
+}
+panes {
+    pane {
+        id 1
+        is_plugin false
+        is_focused true
+        is_fullscreen true
+        is_floating false
+        is_suppressed false
+        title "pane 1"
+        exited false
+        is_held false
+        pane_x 0
+        pane_content_x 1
+        pane_y 0
+        pane_content_y 1
+        pane_rows 5
+        pane_content_rows 4
+        pane_columns 22
+        pane_content_columns 21
+        cursor_coordinates_in_pane 0 0
+        terminal_command "foo"
+        is_selectable true
+        tab_position 0
+    }
+    pane {
+        id 1
+        is_plugin true
+        is_focused true
+        is_fullscreen true
+        is_floating false
+        is_suppressed false
+        title "pane 1"
+        exited false
+        is_held false
+        pane_x 0
+        pane_content_x 1
+        pane_y 0
+        pane_content_y 1
+        pane_rows 5
+        pane_content_rows 4
+        pane_columns 22
+        pane_content_columns 21
+        cursor_coordinates_in_pane 0 0
+        plugin_url "i_am_a_fake_plugin"
+        is_selectable true
+        tab_position 0
+    }
+}
+connected_clients 2
+

zellij-utils/src/plugin_api/event.proto

@@ -39,6 +39,7 @@ enum EventType {
     /// A file was deleted somewhere in the Zellij CWD folder
     FileSystemDelete = 14;
     PermissionRequestResult = 15;
+    SessionUpdate = 16;
 }
 
 message EventNameList {
@@ -59,9 +60,14 @@ message Event {
     CustomMessagePayload custom_message_payload = 10;
     FileListPayload file_list_payload = 11;
     PermissionRequestResultPayload permission_request_result_payload = 12;
+    SessionUpdatePayload session_update_payload = 13;
   }
 }
 
+message SessionUpdatePayload {
+  repeated SessionManifest session_manifests = 1;
+}
+
 message PermissionRequestResultPayload {
   bool granted = 1;
 }
@@ -111,6 +117,14 @@ message PaneManifest {
   repeated PaneInfo panes = 2;
 }
 
+message SessionManifest {
+  string name = 1;
+  repeated TabInfo tabs = 2;
+  repeated PaneManifest panes = 3;
+  uint32 connected_clients = 4;
+  bool is_current_session = 5;
+}
+
 message PaneInfo {
     uint32 id = 1;
     bool is_plugin = 2;

zellij-utils/src/plugin_api/event.rs

@@ -6,7 +6,7 @@ pub use super::generated_api::api::{
         EventType as ProtobufEventType, InputModeKeybinds as ProtobufInputModeKeybinds,
         KeyBind as ProtobufKeyBind, ModeUpdatePayload as ProtobufModeUpdatePayload,
         PaneInfo as ProtobufPaneInfo, PaneManifest as ProtobufPaneManifest,
-        TabInfo as ProtobufTabInfo, *,
+        SessionManifest as ProtobufSessionManifest, TabInfo as ProtobufTabInfo, *,
     },
     input_mode::InputMode as ProtobufInputMode,
     key::Key as ProtobufKey,
@@ -14,7 +14,7 @@ pub use super::generated_api::api::{
 };
 use crate::data::{
     CopyDestination, Event, EventType, InputMode, Key, ModeInfo, Mouse, PaneInfo, PaneManifest,
-    PermissionStatus, PluginCapabilities, Style, TabInfo,
+    PermissionStatus, PluginCapabilities, SessionInfo, Style, TabInfo,
 };
 
 use crate::errors::prelude::*;
@@ -171,6 +171,18 @@ impl TryFrom<ProtobufEvent> for Event {
                 },
                 _ => Err("Malformed payload for the file system delete Event"),
             },
+            Some(ProtobufEventType::SessionUpdate) => match protobuf_event.payload {
+                Some(ProtobufEventPayload::SessionUpdatePayload(
+                    protobuf_session_update_payload,
+                )) => {
+                    let mut session_infos: Vec<SessionInfo> = vec![];
+                    for protobuf_session_info in protobuf_session_update_payload.session_manifests {
+                        session_infos.push(SessionInfo::try_from(protobuf_session_info)?);
+                    }
+                    Ok(Event::SessionUpdate(session_infos))
+                },
+                _ => Err("Malformed payload for the SessionUpdate Event"),
+            },
             None => Err("Unknown Protobuf Event"),
         }
     }
@@ -313,7 +325,80 @@ impl TryFrom<Event> for ProtobufEvent {
                     )),
                 })
             },
+            Event::SessionUpdate(session_infos) => {
+                let mut protobuf_session_manifests = vec![];
+                for session_info in session_infos {
+                    protobuf_session_manifests.push(session_info.try_into()?);
                 }
+                let session_update_payload = SessionUpdatePayload {
+                    session_manifests: protobuf_session_manifests,
+                };
+                Ok(ProtobufEvent {
+                    name: ProtobufEventType::SessionUpdate as i32,
+                    payload: Some(event::Payload::SessionUpdatePayload(session_update_payload)),
+                })
+            },
+        }
+    }
+}
+
+impl TryFrom<SessionInfo> for ProtobufSessionManifest {
+    type Error = &'static str;
+    fn try_from(session_info: SessionInfo) -> Result<Self, &'static str> {
+        let mut protobuf_pane_manifests = vec![];
+        for (tab_index, pane_infos) in session_info.panes.panes {
+            let mut protobuf_pane_infos = vec![];
+            for pane_info in pane_infos {
+                protobuf_pane_infos.push(pane_info.try_into()?);
+            }
+            protobuf_pane_manifests.push(ProtobufPaneManifest {
+                tab_index: tab_index as u32,
+                panes: protobuf_pane_infos,
+            });
+        }
+        Ok(ProtobufSessionManifest {
+            name: session_info.name,
+            panes: protobuf_pane_manifests,
+            tabs: session_info
+                .tabs
+                .iter()
+                .filter_map(|t| t.clone().try_into().ok())
+                .collect(),
+            connected_clients: session_info.connected_clients as u32,
+            is_current_session: session_info.is_current_session,
+        })
+    }
+}
+
+impl TryFrom<ProtobufSessionManifest> for SessionInfo {
+    type Error = &'static str;
+    fn try_from(protobuf_session_manifest: ProtobufSessionManifest) -> Result<Self, &'static str> {
+        let mut pane_manifest: HashMap<usize, Vec<PaneInfo>> = HashMap::new();
+        for protobuf_pane_manifest in protobuf_session_manifest.panes {
+            let tab_index = protobuf_pane_manifest.tab_index as usize;
+            let mut panes = vec![];
+            for protobuf_pane_info in protobuf_pane_manifest.panes {
+                panes.push(protobuf_pane_info.try_into()?);
+            }
+            if pane_manifest.contains_key(&tab_index) {
+                return Err("Duplicate tab definition in pane manifest");
+            }
+            pane_manifest.insert(tab_index, panes);
+        }
+        let panes = PaneManifest {
+            panes: pane_manifest,
+        };
+        Ok(SessionInfo {
+            name: protobuf_session_manifest.name,
+            tabs: protobuf_session_manifest
+                .tabs
+                .iter()
+                .filter_map(|t| t.clone().try_into().ok())
+                .collect(),
+            panes,
+            connected_clients: protobuf_session_manifest.connected_clients as usize,
+            is_current_session: protobuf_session_manifest.is_current_session,
+        })
     }
 }
 
@@ -697,6 +782,7 @@ impl TryFrom<ProtobufEventType> for EventType {
             ProtobufEventType::FileSystemUpdate => EventType::FileSystemUpdate,
             ProtobufEventType::FileSystemDelete => EventType::FileSystemDelete,
             ProtobufEventType::PermissionRequestResult => EventType::PermissionRequestResult,
+            ProtobufEventType::SessionUpdate => EventType::SessionUpdate,
         })
     }
 }
@@ -721,6 +807,7 @@ impl TryFrom<EventType> for ProtobufEventType {
             EventType::FileSystemUpdate => ProtobufEventType::FileSystemUpdate,
             EventType::FileSystemDelete => ProtobufEventType::FileSystemDelete,
             EventType::PermissionRequestResult => ProtobufEventType::PermissionRequestResult,
+            EventType::SessionUpdate => ProtobufEventType::SessionUpdate,
         })
     }
 }
@@ -1083,3 +1170,130 @@ fn serialize_file_system_delete_event() {
         "Event properly serialized/deserialized without change"
     );
 }
+
+#[test]
+fn serialize_session_update_event() {
+    use prost::Message;
+    let session_update_event = Event::SessionUpdate(Default::default());
+    let protobuf_event: ProtobufEvent = session_update_event.clone().try_into().unwrap();
+    let serialized_protobuf_event = protobuf_event.encode_to_vec();
+    let deserialized_protobuf_event: ProtobufEvent =
+        Message::decode(serialized_protobuf_event.as_slice()).unwrap();
+    let deserialized_event: Event = deserialized_protobuf_event.try_into().unwrap();
+    assert_eq!(
+        session_update_event, deserialized_event,
+        "Event properly serialized/deserialized without change"
+    );
+}
+
+#[test]
+fn serialize_session_update_event_with_non_default_values() {
+    use prost::Message;
+    let tab_infos = vec![
+        TabInfo {
+            position: 0,
+            name: "First tab".to_owned(),
+            active: true,
+            panes_to_hide: 2,
+            is_fullscreen_active: true,
+            is_sync_panes_active: false,
+            are_floating_panes_visible: true,
+            other_focused_clients: vec![2, 3, 4],
+            active_swap_layout_name: Some("my cool swap layout".to_owned()),
+            is_swap_layout_dirty: false,
+        },
+        TabInfo {
+            position: 1,
+            name: "Secondtab".to_owned(),
+            active: false,
+            panes_to_hide: 5,
+            is_fullscreen_active: false,
+            is_sync_panes_active: true,
+            are_floating_panes_visible: true,
+            other_focused_clients: vec![1, 5, 111],
+            active_swap_layout_name: None,
+            is_swap_layout_dirty: true,
+        },
+        TabInfo::default(),
+    ];
+    let mut panes = HashMap::new();
+    let panes_list = vec![
+        PaneInfo {
+            id: 1,
+            is_plugin: false,
+            is_focused: true,
+            is_fullscreen: true,
+            is_floating: false,
+            is_suppressed: false,
+            title: "pane 1".to_owned(),
+            exited: false,
+            exit_status: None,
+            is_held: false,
+            pane_x: 0,
+            pane_content_x: 1,
+            pane_y: 0,
+            pane_content_y: 1,
+            pane_rows: 5,
+            pane_content_rows: 4,
+            pane_columns: 22,
+            pane_content_columns: 21,
+            cursor_coordinates_in_pane: Some((0, 0)),
+            terminal_command: Some("foo".to_owned()),
+            plugin_url: None,
+            is_selectable: true,
+        },
+        PaneInfo {
+            id: 1,
+            is_plugin: true,
+            is_focused: true,
+            is_fullscreen: true,
+            is_floating: false,
+            is_suppressed: false,
+            title: "pane 1".to_owned(),
+            exited: false,
+            exit_status: None,
+            is_held: false,
+            pane_x: 0,
+            pane_content_x: 1,
+            pane_y: 0,
+            pane_content_y: 1,
+            pane_rows: 5,
+            pane_content_rows: 4,
+            pane_columns: 22,
+            pane_content_columns: 21,
+            cursor_coordinates_in_pane: Some((0, 0)),
+            terminal_command: None,
+            plugin_url: Some("i_am_a_fake_plugin".to_owned()),
+            is_selectable: true,
+        },
+    ];
+    panes.insert(0, panes_list);
+    let session_info_1 = SessionInfo {
+        name: "session 1".to_owned(),
+        tabs: tab_infos,
+        panes: PaneManifest { panes },
+        connected_clients: 2,
+        is_current_session: true,
+    };
+    let session_info_2 = SessionInfo {
+        name: "session 2".to_owned(),
+        tabs: vec![],
+        panes: PaneManifest {
+            panes: HashMap::new(),
+        },
+        connected_clients: 0,
+        is_current_session: false,
+    };
+    let session_infos = vec![session_info_1, session_info_2];
+
+    let session_update_event = Event::SessionUpdate(session_infos);
+    let protobuf_event: ProtobufEvent = session_update_event.clone().try_into().unwrap();
+    let serialized_protobuf_event = protobuf_event.encode_to_vec();
+    let deserialized_protobuf_event: ProtobufEvent =
+        Message::decode(serialized_protobuf_event.as_slice()).unwrap();
+    let deserialized_event: Event = deserialized_protobuf_event.try_into().unwrap();
+    assert_eq!(
+        session_update_event, deserialized_event,
+        "Event properly serialized/deserialized without change"
+    );
+}

zellij-utils/src/plugin_api/plugin_command.proto

@@ -78,6 +78,7 @@ enum CommandName {
   RenameTab = 64;
   ReportCrash = 65;
   RequestPluginPermissions = 66;
+  SwitchSession = 67;
 }
 
 message PluginCommand {
@@ -120,9 +121,17 @@ message PluginCommand {
     IdAndNewName rename_tab_payload = 36;
     string report_crash_payload = 37;
     RequestPluginPermissionPayload request_plugin_permission_payload = 38;
+    SwitchSessionPayload switch_session_payload = 39;
   }
 }
 
+message SwitchSessionPayload {
+  optional string name = 1;
+  optional uint32 tab_position = 2;
+  optional uint32 pane_id = 3;
+  optional bool pane_id_is_plugin = 4;
+}
+
 message RequestPluginPermissionPayload {
   repeated plugin_permission.PermissionType permissions = 1;
 }

zellij-utils/src/plugin_api/plugin_command.rs

@@ -5,13 +5,13 @@ pub use super::generated_api::api::{
         OpenCommandPanePayload, OpenFilePayload, PaneIdAndShouldFloat,
         PluginCommand as ProtobufPluginCommand, PluginMessagePayload,
         RequestPluginPermissionPayload, ResizePayload, SetTimeoutPayload, SubscribePayload,
-        SwitchTabToPayload, SwitchToModePayload, UnsubscribePayload,
+        SwitchSessionPayload, SwitchTabToPayload, SwitchToModePayload, UnsubscribePayload,
     },
     plugin_permission::PermissionType as ProtobufPermissionType,
     resize::ResizeAction as ProtobufResizeAction,
 };
 
-use crate::data::{PermissionType, PluginCommand};
+use crate::data::{ConnectToSession, PermissionType, PluginCommand};
 
 use std::convert::TryFrom;
 
@@ -500,6 +500,23 @@ impl TryFrom<ProtobufPluginCommand> for PluginCommand {
                 },
                 _ => Err("Mismatched payload for RequestPluginPermission"),
             },
+            Some(CommandName::SwitchSession) => match protobuf_plugin_command.payload {
+                Some(Payload::SwitchSessionPayload(payload)) => {
+                    let pane_id = match (payload.pane_id, payload.pane_id_is_plugin) {
+                        (Some(pane_id), Some(is_plugin)) => Some((pane_id, is_plugin)),
+                        (None, None) => None,
+                        _ => {
+                            return Err("Malformed payload for SwitchSession, 'pane_id' and 'is_plugin' must be included together or not at all")
+                        }
+                    };
+                    Ok(PluginCommand::SwitchSession(ConnectToSession {
+                        name: payload.name,
+                        tab_position: payload.tab_position.map(|p| p as usize),
+                        pane_id,
+                    }))
+                },
+                _ => Err("Mismatched payload for SwitchSession"),
+            },
             None => Err("Unrecognized plugin command"),
         }
     }
@@ -846,6 +863,15 @@ impl TryFrom<PluginCommand> for ProtobufPluginCommand {
                     },
                 )),
             }),
+            PluginCommand::SwitchSession(switch_to_session) => Ok(ProtobufPluginCommand {
+                name: CommandName::SwitchSession as i32,
+                payload: Some(Payload::SwitchSessionPayload(SwitchSessionPayload {
+                    name: switch_to_session.name,
+                    tab_position: switch_to_session.tab_position.map(|t| t as u32),
+                    pane_id: switch_to_session.pane_id.map(|p| p.0),
+                    pane_id_is_plugin: switch_to_session.pane_id.map(|p| p.1),
+                })),
+            }),
         }
     }
 }

zellij-utils/src/snapshots/zellij_utils__setup__setup_test__default_config_with_no_cli_arguments.snap

@@ -2489,6 +2489,29 @@ Config {
             ): [
                 Detach,
             ],
+            Char(
+                'w',
+            ): [
+                LaunchOrFocusPlugin(
+                    RunPlugin {
+                        _allow_exec_host_cmd: false,
+                        location: Zellij(
+                            PluginTag(
+                                "session-manager",
+                            ),
+                        ),
+                        configuration: PluginUserConfiguration(
+                            {
+                                "floating": "true",
+                            },
+                        ),
+                    },
+                    true,
+                ),
+                SwitchToMode(
+                    Normal,
+                ),
+            ],
             Alt(
                 Char(
                     '+',
@@ -3586,6 +3609,23 @@ Config {
                 {},
             ),
         },
+        PluginTag(
+            "session-manager",
+        ): PluginConfig {
+            path: "session-manager",
+            run: Pane(
+                None,
+            ),
+            _allow_exec_host_cmd: false,
+            location: Zellij(
+                PluginTag(
+                    "session-manager",
+                ),
+            ),
+            userspace_configuration: PluginUserConfiguration(
+                {},
+            ),
+        },
         PluginTag(
             "status-bar",
         ): PluginConfig {

zellij-utils/src/snapshots/zellij_utils__setup__setup_test__layout_env_vars_override_config_env_vars.snap

@@ -2489,6 +2489,29 @@ Config {
             ): [
                 Detach,
             ],
+            Char(
+                'w',
+            ): [
+                LaunchOrFocusPlugin(
+                    RunPlugin {
+                        _allow_exec_host_cmd: false,
+                        location: Zellij(
+                            PluginTag(
+                                "session-manager",
+                            ),
+                        ),
+                        configuration: PluginUserConfiguration(
+                            {
+                                "floating": "true",
+                            },
+                        ),
+                    },
+                    true,
+                ),
+                SwitchToMode(
+                    Normal,
+                ),
+            ],
             Alt(
                 Char(
                     '+',
@@ -3586,6 +3609,23 @@ Config {
                 {},
             ),
         },
+        PluginTag(
+            "session-manager",
+        ): PluginConfig {
+            path: "session-manager",
+            run: Pane(
+                None,
+            ),
+            _allow_exec_host_cmd: false,
+            location: Zellij(
+                PluginTag(
+                    "session-manager",
+                ),
+            ),
+            userspace_configuration: PluginUserConfiguration(
+                {},
+            ),
+        },
         PluginTag(
             "status-bar",
         ): PluginConfig {

zellij-utils/src/snapshots/zellij_utils__setup__setup_test__layout_keybinds_override_config_keybinds.snap

@@ -102,6 +102,23 @@ Config {
                 {},
             ),
         },
+        PluginTag(
+            "session-manager",
+        ): PluginConfig {
+            path: "session-manager",
+            run: Pane(
+                None,
+            ),
+            _allow_exec_host_cmd: false,
+            location: Zellij(
+                PluginTag(
+                    "session-manager",
+                ),
+            ),
+            userspace_configuration: PluginUserConfiguration(
+                {},
+            ),
+        },
         PluginTag(
             "status-bar",
         ): PluginConfig {

zellij-utils/src/snapshots/zellij_utils__setup__setup_test__layout_plugins_override_config_plugins.snap

@@ -2489,6 +2489,29 @@ Config {
             ): [
                 Detach,
             ],
+            Char(
+                'w',
+            ): [
+                LaunchOrFocusPlugin(
+                    RunPlugin {
+                        _allow_exec_host_cmd: false,
+                        location: Zellij(
+                            PluginTag(
+                                "session-manager",
+                            ),
+                        ),
+                        configuration: PluginUserConfiguration(
+                            {
+                                "floating": "true",
+                            },
+                        ),
+                    },
+                    true,
+                ),
+                SwitchToMode(
+                    Normal,
+                ),
+            ],
             Alt(
                 Char(
                     '+',
@@ -3586,6 +3609,23 @@ Config {
                 {},
             ),
         },
+        PluginTag(
+            "session-manager",
+        ): PluginConfig {
+            path: "session-manager",
+            run: Pane(
+                None,
+            ),
+            _allow_exec_host_cmd: false,
+            location: Zellij(
+                PluginTag(
+                    "session-manager",
+                ),
+            ),
+            userspace_configuration: PluginUserConfiguration(
+                {},
+            ),
+        },
         PluginTag(
             "some-other-plugin",
         ): PluginConfig {

zellij-utils/src/snapshots/zellij_utils__setup__setup_test__layout_themes_override_config_themes.snap

@@ -2489,6 +2489,29 @@ Config {
             ): [
                 Detach,
             ],
+            Char(
+                'w',
+            ): [
+                LaunchOrFocusPlugin(
+                    RunPlugin {
+                        _allow_exec_host_cmd: false,
+                        location: Zellij(
+                            PluginTag(
+                                "session-manager",
+                            ),
+                        ),
+                        configuration: PluginUserConfiguration(
+                            {
+                                "floating": "true",
+                            },
+                        ),
+                    },
+                    true,
+                ),
+                SwitchToMode(
+                    Normal,
+                ),
+            ],
             Alt(
                 Char(
                     '+',
@@ -3890,6 +3913,23 @@ Config {
                 {},
             ),
         },
+        PluginTag(
+            "session-manager",
+        ): PluginConfig {
+            path: "session-manager",
+            run: Pane(
+                None,
+            ),
+            _allow_exec_host_cmd: false,
+            location: Zellij(
+                PluginTag(
+                    "session-manager",
+                ),
+            ),
+            userspace_configuration: PluginUserConfiguration(
+                {},
+            ),
+        },
         PluginTag(
             "status-bar",
         ): PluginConfig {

zellij-utils/src/snapshots/zellij_utils__setup__setup_test__layout_ui_config_overrides_config_ui_config.snap

@@ -2489,6 +2489,29 @@ Config {
             ): [
                 Detach,
             ],
+            Char(
+                'w',
+            ): [
+                LaunchOrFocusPlugin(
+                    RunPlugin {
+                        _allow_exec_host_cmd: false,
+                        location: Zellij(
+                            PluginTag(
+                                "session-manager",
+                            ),
+                        ),
+                        configuration: PluginUserConfiguration(
+                            {
+                                "floating": "true",
+                            },
+                        ),
+                    },
+                    true,
+                ),
+                SwitchToMode(
+                    Normal,
+                ),
+            ],
             Alt(
                 Char(
                     '+',
@@ -3586,6 +3609,23 @@ Config {
                 {},
             ),
         },
+        PluginTag(
+            "session-manager",
+        ): PluginConfig {
+            path: "session-manager",
+            run: Pane(
+                None,
+            ),
+            _allow_exec_host_cmd: false,
+            location: Zellij(
+                PluginTag(
+                    "session-manager",
+                ),
+            ),
+            userspace_configuration: PluginUserConfiguration(
+                {},
+            ),
+        },
         PluginTag(
             "status-bar",
         ): PluginConfig {