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|
use crossterm::{
cursor,
cursor::position,
event::{self, read, Event, EventStream, KeyCode, KeyEvent},
execute, queue,
style::{Color, Print, SetForegroundColor},
terminal::{self, disable_raw_mode, enable_raw_mode},
};
use futures::{future::FutureExt, select, StreamExt};
use std::io::{self, stdout, Write};
use std::path::PathBuf;
use std::time::Duration;
use anyhow::Error;
use crate::{keymap, Args};
use helix_core::{state::coords_at_pos, Buffer, State};
pub struct BufferComponent<'a> {
x: u16,
y: u16,
contents: Vec<&'a str>,
}
impl BufferComponent<'_> {
pub fn render(&self) {
let mut line_count = 0;
for line in &self.contents {
execute!(
stdout(),
SetForegroundColor(Color::DarkCyan),
cursor::MoveTo(self.x, self.y + line_count),
Print((line_count + 1).to_string())
);
execute!(
stdout(),
SetForegroundColor(Color::Reset),
cursor::MoveTo(self.x + 2, self.y + line_count),
Print(line)
);
line_count += 1;
}
}
}
pub struct Editor {
state: Option<State>,
first_line: u16,
size: (u16, u16),
}
impl Editor {
pub fn new(mut args: Args) -> Result<Self, Error> {
let mut editor = Editor {
state: None,
first_line: 0,
size: terminal::size().unwrap(),
};
if let Some(file) = args.files.pop() {
editor.open(file)?;
}
Ok(editor)
}
pub fn open(&mut self, path: PathBuf) -> Result<(), Error> {
let buffer = Buffer::load(path)?;
let state = State::new(buffer);
self.state = Some(state);
Ok(())
}
fn render(&mut self) {
// TODO:
match &self.state {
Some(s) => {
let view = BufferComponent {
x: 0,
y: self.first_line,
contents: s
.file()
.lines_at(self.first_line as usize)
.take(self.size.1 as usize)
.map(|x| x.as_str().unwrap())
.collect::<Vec<&str>>(),
};
view.render();
}
None => (),
}
}
pub async fn print_events(&mut self) {
let mut reader = EventStream::new();
let keymap = keymap::default();
self.render();
loop {
// Handle key events
let mut event = reader.next().await;
match event {
// TODO: handle resize events
Some(Ok(Event::Key(KeyEvent {
code: KeyCode::Char('q'),
..
}))) => {
break;
}
Some(Ok(Event::Key(event))) => {
// TODO: handle modes and sequences (`gg`)
if let Some(command) = keymap.get(&event) {
if let Some(state) = &mut self.state {
// TODO: handle count other than 1
command(state, 1);
self.render();
// render the cursor
let pos = self.state.as_ref().unwrap().selection.primary().head;
let coords = coords_at_pos(
&self.state.as_ref().unwrap().doc.contents.slice(..),
pos,
);
execute!(
stdout(),
cursor::MoveTo((coords.1 + 2) as u16, coords.0 as u16)
);
}
}
}
Some(Ok(_)) => {
// unhandled event
()
}
Some(Err(x)) => panic!(x),
None => break,
}
}
}
pub fn run(&mut self) -> Result<(), Error> {
enable_raw_mode()?;
let mut stdout = stdout();
execute!(stdout, terminal::EnterAlternateScreen)?;
use std::thread;
// Same number of threads as there are CPU cores.
let num_threads = num_cpus::get().max(1);
// A channel that sends the shutdown signal.
let (s, r) = piper::chan::<()>(0);
let mut threads = Vec::new();
// Create an executor thread pool.
for _ in 0..num_threads {
// Spawn an executor thread that waits for the shutdown signal.
let r = r.clone();
threads.push(thread::spawn(move || smol::run(r.recv())));
}
// No need to `run()`, now we can just block on the main future.
smol::block_on(self.print_events());
// Send a shutdown signal.
drop(s);
execute!(stdout, terminal::LeaveAlternateScreen)?;
// Wait for threads to finish.
for t in threads {
t.join().unwrap();
}
disable_raw_mode()?;
Ok(())
}
}
|
