fix(scroll): support show/hide cursor and fix vim scrolling behaviour (#27)

src/main.rs

@@ -269,7 +269,7 @@ pub fn start(mut os_input: Box<dyn OsApi>, opts: Opt) {
             send_screen_instructions.send(ScreenInstruction::ScrollDown).unwrap();
         } else if buffer[0] == 24 { // ctrl-x
             send_screen_instructions.send(ScreenInstruction::CloseFocusedPane).unwrap();
-        } else if buffer[0] == 6 { // ctrl-f
+        } else if buffer[0] == 5 { // ctrl-e
             send_screen_instructions.send(ScreenInstruction::ToggleActiveTerminalFullscreen).unwrap();
         } else {
             // println!("\r buffer {:?}   ", buffer[0]);

src/screen.rs

@@ -264,13 +264,13 @@ impl Screen {
             self.os_api.tcdrain(*active_terminal_id).expect("failed to drain terminal");
         }
     }
-    fn get_active_terminal_cursor_position(&self) -> (usize, usize) { // (x, y)
+    fn get_active_terminal_cursor_position(&self) -> Option<(usize, usize)> { // (x, y)
         let active_terminal = &self.get_active_terminal().unwrap();
-        let (x_in_terminal, y_in_terminal) = active_terminal.cursor_coordinates();
-
+        active_terminal.cursor_coordinates().and_then(|(x_in_terminal, y_in_terminal)| {
             let x = active_terminal.get_x() + x_in_terminal;
             let y = active_terminal.get_y() + y_in_terminal;
-        (x, y)
+            Some((x, y))
+        })
     }
     pub fn toggle_active_terminal_fullscreen(&mut self) {
         if let Some(active_terminal_id) = self.get_active_terminal_id() {
@@ -312,10 +312,20 @@ impl Screen {
         let vte_output = boundaries.vte_output();
         stdout.write_all(&vte_output.as_bytes()).expect("cannot write to stdout");
 
-        let (cursor_position_x, cursor_position_y) = self.get_active_terminal_cursor_position();
+        match self.get_active_terminal_cursor_position() {
+            Some((cursor_position_x, cursor_position_y)) => {
+                let show_cursor = "\u{1b}[?25h";
                 let goto_cursor_position = format!("\u{1b}[{};{}H\u{1b}[m", cursor_position_y + 1, cursor_position_x + 1); // goto row/col
+                stdout.write_all(&show_cursor.as_bytes()).expect("cannot write to stdout");
                 stdout.write_all(&goto_cursor_position.as_bytes()).expect("cannot write to stdout");
                 stdout.flush().expect("could not flush");
+            },
+            None => {
+                let hide_cursor = "\u{1b}[?25l";
+                stdout.write_all(&hide_cursor.as_bytes()).expect("cannot write to stdout");
+                stdout.flush().expect("could not flush");
+            }
+        }
     }
     fn terminal_ids_directly_left_of(&self, id: &RawFd) -> Option<Vec<RawFd>> {
         let mut ids = vec![];

src/terminal_pane/scroll.rs

@@ -172,7 +172,8 @@ pub struct Scroll {
     total_columns: usize,
     lines_in_view: usize,
     viewport_bottom_offset: Option<usize>,
-    scroll_region: Option<(usize, usize)> // start line, end line (if set, this is the area the will scroll)
+    scroll_region: Option<(usize, usize)>, // start line, end line (if set, this is the area the will scroll)
+    show_cursor: bool,
 }
 
 impl Scroll {
@@ -187,6 +188,7 @@ impl Scroll {
             cursor_position, 
             viewport_bottom_offset: None,
             scroll_region: None,
+            show_cursor: true,
         }
     }
     pub fn as_character_lines(&self) -> Vec<Vec<TerminalCharacter>> {
@@ -243,10 +245,17 @@ impl Scroll {
             self.cursor_position.move_to_beginning_of_linewrap();
         }
     }
+    pub fn show_cursor (&mut self) {
+        self.show_cursor = true;
+    }
+    pub fn hide_cursor (&mut self) {
+        self.show_cursor = false;
+    }
     pub fn add_canonical_line(&mut self) {
         let current_canonical_line_index = self.cursor_position.line_index.0;
         if let Some((scroll_region_top, scroll_region_bottom)) = self.scroll_region {
             // the scroll region indices start at 1, so we need to adjust them
+            if self.show_cursor { // scroll region should be ignored if the cursor is hidden
                 let scroll_region_top_index = scroll_region_top - 1;
                 let scroll_region_bottom_index = scroll_region_bottom - 1;
                 if current_canonical_line_index == scroll_region_bottom_index { // end of scroll region
@@ -260,6 +269,7 @@ impl Scroll {
                     return;
                 }
             }
+        }
         if current_canonical_line_index == self.canonical_lines.len() - 1 {
             let new_canonical_line = CanonicalLine::new();
             self.canonical_lines.push(new_canonical_line);
@@ -272,7 +282,10 @@ impl Scroll {
             panic!("cursor out of bounds, cannot add_canonical_line");
         }
     }
-    pub fn cursor_coordinates_on_screen(&self) -> (usize, usize) { // (x, y)
+    pub fn cursor_coordinates_on_screen(&self) -> Option<(usize, usize)> { // (x, y)
+        if !self.show_cursor {
+            return None
+        }
         let (canonical_line_cursor_position, line_wrap_cursor_position) = self.cursor_position.line_index;
         let x = self.cursor_position.column_index;
         let mut y = 0;
@@ -294,10 +307,12 @@ impl Scroll {
         let total_lines = self.canonical_lines.iter().fold(0, |total_lines, current_line| total_lines + current_line.wrapped_fragments.len()); // TODO: is this performant enough? should it be cached or kept track of?
         let y = if total_lines < self.lines_in_view {
             total_lines - y
+        } else if y > self.lines_in_view {
+            self.lines_in_view
         } else {
             self.lines_in_view - y
         };
-        (x, y)
+        Some((x, y))
     }
     pub fn move_cursor_forward(&mut self, count: usize) {
         let (current_canonical_line_index, current_line_wrap_position) = self.cursor_position.line_index;

src/terminal_pane/terminal_pane.rs

@@ -223,7 +223,7 @@ impl TerminalPane {
     pub fn read_buffer_as_lines (&self) -> Vec<Vec<TerminalCharacter>> {
         self.scroll.as_character_lines()
     }
-    pub fn cursor_coordinates (&self) -> (usize, usize) { // (x, y)
+    pub fn cursor_coordinates (&self) -> Option<(usize, usize)> { // (x, y)
         self.scroll.cursor_coordinates_on_screen()
     }
     pub fn scroll_up(&mut self, count: usize) {
@@ -255,8 +255,8 @@ impl TerminalPane {
         self.should_render = true;
     }
     fn add_newline (&mut self) {
-        self.scroll.add_canonical_line(); // TODO: handle scroll region
-        self.reset_all_ansi_codes();
+        self.scroll.add_canonical_line();
+        // self.reset_all_ansi_codes(); // TODO: find out if we should be resetting here or not
         self.should_render = true;
     }
     fn move_to_beginning_of_line (&mut self) {
@@ -557,14 +557,41 @@ impl vte::Perform for TerminalPane {
             let move_back_count = if params[0] == 0 { 1 } else { params[0] as usize };
             self.scroll.move_cursor_back(move_back_count);
         } else if c == 'l' {
-            // TBD
+            let first_intermediate_is_questionmark = match _intermediates.get(0) {
+                Some(b'?') => true,
+                None => false,
+                _ => false
+            };
+            if first_intermediate_is_questionmark {
+                match params.get(0) {
+                    Some(25) => {
+                        self.scroll.hide_cursor();
+                        self.should_render = true;
+                    },
+                    _ => {}
+                };
+            }
         } else if c == 'h' {
-            // TBD
+            let first_intermediate_is_questionmark = match _intermediates.get(0) {
+                Some(b'?') => true,
+                None => false,
+                _ => false
+            };
+            if first_intermediate_is_questionmark {
+                match params.get(0) {
+                    Some(25) => {
+                        self.scroll.show_cursor();
+                        self.should_render = true;
+                    },
+                    _ => {}
+                };
+            }
         } else if c == 'r' {
             if params.len() > 1 {
                 let top_line_index = params[0] as usize;
                 let bottom_line_index = params[1] as usize;
                 self.scroll.set_scroll_region(top_line_index, bottom_line_index);
+                self.scroll.show_cursor();
             } else {
                 self.scroll.clear_scroll_region();
             }

src/tests/integration/basic.rs

@@ -170,7 +170,7 @@ pub fn toggle_focused_pane_fullscreen () {
     // split-largest_terminal * 3, toggle-fullscreen * 2, ctrl-p, toggle-fullscreen * 2, ctrl-p, toggle-fullscreen * 2, ctrl-p, toggle-fullscreen * 2 and quit
     // (ctrl-z + ctrl-z + ctrl-z + ctrl-z + ctrl-f, ctrl-f, ctrl-p, ctrl-f, ctrl-f, ctrl-p, ctrl-f,
     // ctrl-f, ctrl-p, ctrl-f, ctrl-f, ctrl-q)
-    fake_input_output.add_terminal_input(&[26, 26, 26, 6, 6, 16, 6, 6, 16, 6, 6, 16, 6, 6, 17]);
+    fake_input_output.add_terminal_input(&[26, 26, 26, 5, 5, 16, 5, 5, 16, 5, 5, 16, 5, 5, 17]);
     let mut opts = Opt::default();
     opts.max_panes = Some(4);
     start(Box::new(fake_input_output.clone()), opts);

src/tests/integration/snapshots/mosaic__tests__integration__compatibility__run_bandwhich_from_fish_shell-2.snap

@@ -29,4 +29,4 @@ expression: snapshot
 │                                                                                                                  │
 └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
  Press <SPACE> to pause. Use <TAB> to rearrange tables. (DNS queries hidden).                                       
-Bye from Mosaic!█                                                                                                   
+Bye from Mosaic!                                                                                                    

src/tests/integration/snapshots/mosaic__tests__integration__compatibility__run_bandwhich_from_fish_shell.snap

@@ -6,7 +6,7 @@ expression: snapshot
 ┌Utilization by process name───────────────────────────────────────────────────────────────────────────────────────┐
 │Process                                              Connections              Up / Down                           │
 │                                                                                                                  │
-│firefox                                              3                        46Bps / 5█Bps                       │
+│firefox                                              3                        46Bps / 57Bps                       │
 │                                                                                                                  │
 │                                                                                                                  │
 │                                                                                                                  │

src/tests/utils.rs

@@ -14,16 +14,18 @@ pub fn get_output_frame_snapshots(output_frames: &[Vec<u8>], win_size: &Winsize)
             vte_parser.advance(&mut terminal_output, *byte);
         }
         let output_lines = terminal_output.read_buffer_as_lines();
-        let (cursor_x, cursor_y) = terminal_output.cursor_coordinates();
+        let cursor_coordinates = terminal_output.cursor_coordinates();
         let mut snapshot = String::new();
         for (line_index, line) in output_lines.iter().enumerate() {
             for (character_index, terminal_character) in line.iter().enumerate() {
+                if let Some((cursor_x, cursor_y)) = cursor_coordinates {
                     if line_index == cursor_y && character_index == cursor_x {
                         snapshot.push('█');
-                } else {
-                    snapshot.push(terminal_character.character);
+                        continue;
                     }
                 }
+                snapshot.push(terminal_character.character);
+            }
             if line_index != output_lines.len() - 1 {
                 snapshot.push('\n');
             }