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render buffer

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This commit is contained in:
Aram Drevekenin 2020-08-25 15:59:19 +02:00
parent 91f172588c
commit 1a3e74be47
1 changed files with 96 additions and 111 deletions
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205
src/main.rs
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@ -5,7 +5,7 @@ use futures::future::join_all;
use ::std::fmt::{self, Display, Formatter};
use std::cmp::max;
use std::io::{Read, Write};
use std::collections::VecDeque;
use std::collections::{VecDeque};
use nix::pty::Winsize;
use std::os::unix::io::RawFd;
use ::std::thread;
@ -18,8 +18,6 @@ use std::sync::mpsc::{channel, Sender, Receiver};
use crate::os_input_output::{get_os_input, OsInputOutput, OsApi};
struct ReadFromPid {
pid: RawFd,
os_input: Box<dyn OsApi>,
@ -52,7 +50,6 @@ impl Stream for ReadFromPid {
nix::Error::Sys(errno) => {
if *errno == nix::errno::Errno::EAGAIN {
return Poll::Ready(Some(vec![])) // TODO: better with timeout waker somehow
// task::block_on(task::sleep(Duration::from_millis(10)));
} else {
panic!("error {:?}", e);
}
@ -121,12 +118,13 @@ struct TerminalOutput {
newline_indices: Vec<usize>, // canonical line breaks we get from the vt interpreter
linebreak_indices: Vec<usize>, // linebreaks from line wrapping
pending_ansi_code: Option<String>, // this is used eg. in a carriage return, where we need to preserve the style
x_coords: u16,
}
const EMPTY_TERMINAL_CHARACTER: TerminalCharacter = TerminalCharacter { character: ' ', ansi_code: None };
impl TerminalOutput {
pub fn new (pid: RawFd, ws: Winsize) -> TerminalOutput {
pub fn new (pid: RawFd, ws: Winsize, x_coords: u16) -> TerminalOutput {
TerminalOutput {
pid,
characters: vec![],
@ -137,9 +135,11 @@ impl TerminalOutput {
display_cols: ws.ws_col,
should_render: false,
pending_ansi_code: None,
x_coords,
}
}
pub fn handle_event(&mut self, event: VteEvent) {
self.should_render = true; // TODO: more accurately
match event {
VteEvent::Print(c) => {
self.print(c);
@ -167,12 +167,24 @@ impl TerminalOutput {
}
}
}
pub fn reduce_width(&mut self, count: u16) {
pub fn reduce_width_right(&mut self, count: u16) {
self.x_coords += count;
self.display_cols -= count;
self.reflow_lines();
self.should_render = true;
}
pub fn increase_width(&mut self, count: u16) {
pub fn reduce_width_left(&mut self, count: u16) {
self.display_cols -= count;
self.reflow_lines();
self.should_render = true;
}
pub fn increase_width_left(&mut self, count: u16) {
self.x_coords -= count;
self.display_cols += count;
self.reflow_lines();
self.should_render = true;
}
pub fn increase_width_right(&mut self, count: u16) {
self.display_cols += count;
self.reflow_lines();
self.should_render = true;
@ -188,14 +200,37 @@ impl TerminalOutput {
if next_newline_index == Some(&i) {
x = 0;
next_newline_index = newline_indices.next();
} else if x == self.display_cols as u64 && i < self.cursor_position {
} else if x == self.display_cols as u64 && i <= self.cursor_position {
self.linebreak_indices.push(i);
x = 0;
}
x += 1;
}
}
pub fn read_buffer_as_lines (&self) -> Vec<Vec<&TerminalCharacter>> {
pub fn buffer_as_vte_output(&mut self) -> Option<String> {
if self.should_render {
let mut vte_output = String::new();
let buffer_lines = &self.read_buffer_as_lines();
let display_cols = &self.display_cols;
for (row, line) in buffer_lines.iter().enumerate() {
// vte_output.push_str(&format!("\u{1b}[{};{}H\u{1b}[m", row + 1, 1)); // goto row/col
vte_output.push_str(&format!("\u{1b}[{};{}H\u{1b}[m", row + 1, self.x_coords + 1)); // goto row/col
for (col, t_character) in line.iter().enumerate() {
if (col as u16) < *display_cols {
// in some cases (eg. while resizing) some characters will spill over
// before they are corrected by the shell (for the prompt) or by reflowing
// lines
vte_output.push_str(&t_character.to_string());
}
}
}
self.should_render = false;
Some(vte_output)
} else {
None
}
}
fn read_buffer_as_lines (&self) -> Vec<Vec<&TerminalCharacter>> {
if DEBUGGING {
return vec![];
}
@ -212,33 +247,41 @@ impl TerminalOutput {
let mut next_newline_index = newline_indices.next();
let mut next_linebreak_index = linebreak_indices.next();
let mut debug_messages = String::new();
loop {
debug_messages.push_str(&format!("\r\n*** i {:?}", i));
i -= 1;
let terminal_character = self.characters.get(i).unwrap();
current_line.push_front(terminal_character);
if let Some(newline_index) = next_newline_index {
if newline_index == &i {
debug_messages.push_str(&format!("Some(newline_index): {:?} == {:?}", newline_index, i));
if *newline_index == i + 1 {
debug_messages.push_str(&format!("equals i"));
// pad line
for _ in current_line.len()..self.display_cols as usize {
current_line.push_back(&EMPTY_TERMINAL_CHARACTER);
}
output.push_front(Vec::from(current_line.drain(..).collect::<Vec<&TerminalCharacter>>()));
next_newline_index = newline_indices.next();
continue;
}
}
if let Some(linebreak_index) = next_linebreak_index {
if linebreak_index == &i {
debug_messages.push_str(&format!("Some(linebreak_index): {:?}", linebreak_index));
if *linebreak_index == i + 1 {
debug_messages.push_str(&format!("equals i"));
// pad line
for _ in current_line.len()..self.display_cols as usize {
current_line.push_back(&EMPTY_TERMINAL_CHARACTER);
}
output.push_front(Vec::from(current_line.drain(..).collect::<Vec<&TerminalCharacter>>()));
next_linebreak_index = linebreak_indices.next();
continue;
}
}
if i == 0 || output.len() == self.display_rows as usize {
let terminal_character = self.characters.get(i).unwrap();
current_line.push_front(terminal_character);
if i == 0 || output.len() == self.display_rows as usize - 1 {
for _ in current_line.len()..self.display_cols as usize {
current_line.push_back(&EMPTY_TERMINAL_CHARACTER);
}
output.push_front(Vec::from(current_line.drain(..).collect::<Vec<&TerminalCharacter>>()));
break;
}
}
@ -251,7 +294,14 @@ impl TerminalOutput {
output.push_front(Vec::from(empty_line.clone()));
}
}
// self.should_render = false;
let mut debug_output = String::new();
for line in output.iter() {
for t_char in line.iter() {
debug_output.push(t_char.character);
}
debug_output.push('\n');
}
Vec::from(output)
}
pub fn cursor_position_in_last_line (&self) -> usize {
@ -334,8 +384,8 @@ impl TerminalOutput {
}
}
fn add_newline (&mut self) {
self.newline_indices.push(self.characters.len()); // -1?
self.cursor_position = self.characters.len(); // -1?
self.newline_indices.push(self.characters.len());
self.cursor_position = self.characters.len();
self.should_render = true;
self.pending_ansi_code = None;
}
@ -591,21 +641,6 @@ fn split_horizontally_with_gap (rect: &Winsize) -> (Winsize, Winsize) {
(first_rect, second_rect)
}
fn character_is_already_onscreen(
last_character: &TerminalCharacter,
current_character: &TerminalCharacter,
) -> bool {
let last_character_style = match &last_character.ansi_code {
Some(ansi_code) => Some(ansi_code.as_str()),
None => None,
};
let current_character_style = match &current_character.ansi_code {
Some(ansi_code) => Some(ansi_code.as_str()),
None => None,
};
last_character_style == current_character_style && last_character.character == current_character.character
}
enum ScreenInstruction {
Pty(RawFd, VteEvent),
Render,
@ -620,7 +655,6 @@ struct Screen {
pub receiver: Receiver<ScreenInstruction>,
pub sender: Sender<ScreenInstruction>,
full_screen_ws: Winsize,
last_frame: Option<Vec<TerminalCharacter>>,
vertical_separator: TerminalCharacter, // TODO: better
active_terminal: Option<RawFd>,
terminal1_output: Option<TerminalOutput>,
@ -635,7 +669,6 @@ impl Screen {
receiver,
sender,
full_screen_ws: full_screen_ws.clone(),
last_frame: None,
vertical_separator: TerminalCharacter::new('|').ansi_code(String::from("\u{1b}[m")), // TODO: better
terminal1_output: None,
terminal2_output: None,
@ -645,10 +678,12 @@ impl Screen {
}
pub fn add_terminal(&mut self, pid: RawFd, ws: Winsize) {
if self.terminal1_output.is_none() {
self.terminal1_output = Some(TerminalOutput::new(pid, ws));
let terminal1_x = 0;
self.terminal1_output = Some(TerminalOutput::new(pid, ws, terminal1_x));
self.active_terminal = Some(pid);
} else if self.terminal2_output.is_none() {
self.terminal2_output = Some(TerminalOutput::new(pid, ws));
let terminal2_x = self.terminal1_output.as_ref().unwrap().display_cols + 1;
self.terminal2_output = Some(TerminalOutput::new(pid, ws, terminal2_x));
} else {
panic!("cannot support more than 2 terminals atm");
}
@ -675,98 +710,48 @@ impl Screen {
}
}
pub fn render (&mut self) {
let left_terminal_lines = self.terminal1_output.as_ref().unwrap().read_buffer_as_lines();
let right_terminal_lines = self.terminal2_output.as_ref().unwrap().read_buffer_as_lines();
if left_terminal_lines.len() < self.full_screen_ws.ws_row as usize || right_terminal_lines.len() < self.full_screen_ws.ws_row as usize {
// TODO: this is hacky and is only here(?) for when the terminals are not ready yet
return;
}
let vte_output_terminal1 = self.terminal1_output.as_mut().unwrap().buffer_as_vte_output();
let vte_output_terminal2 = self.terminal2_output.as_mut().unwrap().buffer_as_vte_output();
let mut frame: Vec<&TerminalCharacter> = vec![];
let empty_vec = vec![]; // TODO: do not allocate, and less hacky
for i in 0..self.full_screen_ws.ws_row {
let left_terminal_row = left_terminal_lines.get(i as usize).unwrap_or(&empty_vec);
for terminal_character in left_terminal_row.iter() {
frame.push(terminal_character);
let mut vte_output_boundaries = String::new();
for row in 0..self.full_screen_ws.ws_row {
vte_output_boundaries.push_str(&format!("\u{1b}[{};{}H\u{1b}[m", row + 1, self.terminal1_output.as_ref().unwrap().display_cols + 1)); // goto row/col
vte_output_boundaries.push_str(&self.vertical_separator.to_string());
}
frame.push(&self.vertical_separator);
let right_terminal_row = right_terminal_lines.get(i as usize).unwrap_or(&empty_vec);
for terminal_character in right_terminal_row.iter() {
frame.push(terminal_character);
}
}
let mut data_lines = String::new();
match &self.last_frame {
Some(last_frame) => {
if last_frame.len() != frame.len() {
// this is not ideal
// right now it happens when we resize a pane, until fish resets the last line
return
}
let mut last_character_was_changed = false;
let mut last_rendered_char_style = None;
for i in 0..last_frame.len() {
let last_character = last_frame.get(i).unwrap();
let current_character = frame.get(i).unwrap();
let row = i / self.full_screen_ws.ws_col as usize + 1;
let col = i % self.full_screen_ws.ws_col as usize + 1;
if !character_is_already_onscreen(&last_character, &current_character) {
if !last_character_was_changed {
data_lines.push_str(&format!("\u{1b}[{};{}H\u{1b}[m", row, &col)); // goto row/col
}
// TODO: only render the ansi_code if it is different from the previous
// rendered ansi code (previous char in this loop)
if last_rendered_char_style == current_character.ansi_code && last_character_was_changed {
data_lines.push(current_character.character);
} else {
data_lines.push_str(&current_character.to_string());
last_rendered_char_style = current_character.ansi_code.clone();
}
last_character_was_changed = true;
} else {
last_character_was_changed = false;
last_rendered_char_style = None;
}
}
},
None => {
print!("\u{1b}c"); // clear screen
for terminal_character in frame.iter() {
data_lines.push_str(&terminal_character.to_string());
}
}
}
// TODO: consider looping through current frame and only updating the cells that changed
self.last_frame = Some(frame.into_iter().cloned().collect::<Vec<_>>());
let left_terminal_cursor_position = self.terminal1_output.as_ref().unwrap().cursor_position_in_last_line();
let right_terminal_cursor_position = self.terminal2_output.as_ref().unwrap().cursor_position_in_last_line();
let active_terminal = self.active_terminal.unwrap();
if active_terminal == self.terminal1_output.as_ref().unwrap().pid {
data_lines.push_str(&format!("\r\u{1b}[{}C", left_terminal_cursor_position));
let goto_cursor_position = format!("\r\u{1b}[{}C", left_terminal_cursor_position);
vte_output_boundaries.push_str(&goto_cursor_position);
} else {
data_lines.push_str(&format!("\r\u{1b}[{}C", right_terminal_cursor_position + (self.terminal1_output.as_ref().unwrap().display_cols + 1) as usize));
let goto_cursor_position = format!("\r\u{1b}[{}C", right_terminal_cursor_position + (self.terminal1_output.as_ref().unwrap().display_cols + 1) as usize);
vte_output_boundaries.push_str(&goto_cursor_position);
}
::std::io::stdout().write_all(&data_lines.as_bytes()).expect("cannot write to stdout");
if let Some(vte_output_terminal1) = vte_output_terminal1 {
::std::io::stdout().write_all(&vte_output_terminal1.as_bytes()).expect("cannot write to stdout");
}
if let Some(vte_output_terminal2) = vte_output_terminal2 {
::std::io::stdout().write_all(&vte_output_terminal2.as_bytes()).expect("cannot write to stdout");
}
// ::std::io::stdout().write_all(&vte_output_terminal2.as_bytes()).expect("cannot write to stdout");
::std::io::stdout().write_all(&vte_output_boundaries.as_bytes()).expect("cannot write to stdout");
::std::io::stdout().flush().expect("could not flush");
}
pub fn resize_left (&mut self) {
let terminal1_output = self.terminal1_output.as_mut().unwrap();
let terminal2_output = self.terminal2_output.as_mut().unwrap();
terminal1_output.reduce_width(10);
terminal2_output.increase_width(10);
terminal1_output.reduce_width_left(10);
terminal2_output.increase_width_left(10);
self.os_api.set_terminal_size_using_fd(terminal1_output.pid, terminal1_output.display_cols, terminal1_output.display_rows);
self.os_api.set_terminal_size_using_fd(terminal2_output.pid, terminal2_output.display_cols, terminal2_output.display_rows);
}
pub fn resize_right (&mut self) {
let terminal1_output = self.terminal1_output.as_mut().unwrap();
let terminal2_output = self.terminal2_output.as_mut().unwrap();
terminal1_output.increase_width(10);
terminal2_output.reduce_width(10);
terminal1_output.increase_width_right(10);
terminal2_output.reduce_width_right(10);
self.os_api.set_terminal_size_using_fd(terminal1_output.pid, terminal1_output.display_cols, terminal1_output.display_rows);
self.os_api.set_terminal_size_using_fd(terminal2_output.pid, terminal2_output.display_cols, terminal2_output.display_rows);
}