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use crate::{keymap, Args};
use anyhow::Error;
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 helix_core::{state::coords_at_pos, state::Mode, State};
use std::io::{self, stdout, Write};
use std::path::PathBuf;
use std::time::Duration;
use tui::backend::CrosstermBackend;
use tui::buffer::Buffer as Surface;
use tui::layout::Rect;
use tui::style::Style;
type Terminal = tui::Terminal<CrosstermBackend<std::io::Stdout>>;
static EX: smol::Executor = smol::Executor::new();
pub struct Editor {
terminal: Terminal,
state: Option<State>,
first_line: u16,
size: (u16, u16),
}
impl Editor {
pub fn new(mut args: Args) -> Result<Self, Error> {
let backend = CrosstermBackend::new(stdout());
let mut terminal = Terminal::new(backend)?;
let mut editor = Editor {
terminal,
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> {
self.state = Some(State::load(path)?);
Ok(())
}
fn render(&mut self) {
match &self.state {
Some(state) => {
let area = Rect::new(0, 0, self.size.0, self.size.1);
let mut surface = Surface::empty(area);
let lines = state
.doc
.lines_at(self.first_line as usize)
.take(self.size.1 as usize)
.map(|x| x.as_str().unwrap());
let mut stdout = stdout();
for (n, line) in lines.enumerate() {
execute!(
stdout,
SetForegroundColor(Color::DarkCyan),
cursor::MoveTo(0, n as u16),
Print((n + 1).to_string())
);
surface.set_string(2, n as u16, line, Style::default());
// execute!(
// stdout,
// SetForegroundColor(Color::Reset),
// cursor::MoveTo(2, n as u16),
// Print(line)
// );
}
// iterate over selections and render them
let select = Style::default().bg(tui::style::Color::LightBlue);
let text = state.doc.slice(..);
for range in state.selection.ranges() {
// get terminal coords for x,y for each range pos
// TODO: this won't work with multiline
let (y1, x1) = coords_at_pos(&text, range.from());
let (y2, x2) = coords_at_pos(&text, range.to());
let area = Rect::new(
(x1 + 2) as u16,
y1 as u16,
(x2 - x1 + 1) as u16,
(y2 - y1 + 1) as u16,
);
surface.set_style(area, select);
// TODO: don't highlight next char in append mode
}
let mode = match state.mode {
Mode::Insert => "INS",
Mode::Normal => "NOR",
};
execute!(
stdout,
SetForegroundColor(Color::Reset),
cursor::MoveTo(0, self.size.1),
Print(mode)
);
use tui::backend::Backend;
// TODO: double buffer and diff here
let empty = Surface::empty(area);
self.terminal
.backend_mut()
.draw(empty.diff(&surface).into_iter());
// set cursor shape
match state.mode {
Mode::Insert => write!(stdout, "\x1B[6 q"),
Mode::Normal => write!(stdout, "\x1B[2 q"),
};
// render the cursor
let pos = state.selection.cursor();
let coords = coords_at_pos(&state.doc.slice(..), pos);
execute!(
stdout,
cursor::MoveTo((coords.1 + 2) as u16, coords.0 as u16)
);
}
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))) => {
if let Some(state) = &mut self.state {
match state.mode {
Mode::Insert => {
match event {
KeyEvent {
code: KeyCode::Esc, ..
} => helix_core::commands::normal_mode(state, 1),
KeyEvent {
code: KeyCode::Char(c),
..
} => helix_core::commands::insert_char(state, c),
_ => (), // skip
}
self.render();
}
Mode::Normal => {
// TODO: handle modes and sequences (`gg`)
if let Some(command) = keymap.get(&event) {
// TODO: handle count other than 1
command(state, 1);
self.render();
}
}
}
}
}
Some(Ok(_)) => {
// unhandled event
}
Some(Err(x)) => panic!(x),
None => break,
}
}
}
pub async fn run(&mut self) -> Result<(), Error> {
enable_raw_mode()?;
let mut stdout = stdout();
execute!(stdout, terminal::EnterAlternateScreen)?;
self.print_events().await;
// reset cursor shape
write!(stdout, "\x1B[2 q");
execute!(stdout, terminal::LeaveAlternateScreen)?;
disable_raw_mode()?;
Ok(())
}
}
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