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|
use super::{MarkdownRender, ReplyEvent};
use crate::utils::{split_line_tail, AbortSignal};
use anyhow::Result;
use crossbeam::channel::Receiver;
use crossterm::{
cursor,
event::{self, Event, KeyCode, KeyModifiers},
queue, style,
terminal::{self, disable_raw_mode, enable_raw_mode},
};
use std::{
io::{self, Stdout, Write},
time::{Duration, Instant},
};
use textwrap::core::display_width;
pub fn repl_render_stream(
rx: &Receiver<ReplyEvent>,
render: &mut MarkdownRender,
abort: &AbortSignal,
) -> Result<()> {
enable_raw_mode()?;
let mut stdout = io::stdout();
let ret = repl_render_stream_inner(rx, render, abort, &mut stdout);
disable_raw_mode()?;
ret
}
fn repl_render_stream_inner(
rx: &Receiver<ReplyEvent>,
render: &mut MarkdownRender,
abort: &AbortSignal,
writer: &mut Stdout,
) -> Result<()> {
let mut last_tick = Instant::now();
let tick_rate = Duration::from_millis(50);
let mut buffer = String::new();
let mut buffer_rows = 1;
let columns = terminal::size()?.0;
loop {
if abort.aborted() {
return Ok(());
}
if let Ok(evt) = rx.try_recv() {
match evt {
ReplyEvent::Text(text) => {
let (col, mut row) = cursor::position()?;
// Fix unexpected duplicate lines on kitty, see https://github.com/sigoden/aichat/issues/105
if col == 0 && row > 0 && display_width(&buffer) == columns as usize {
row -= 1;
}
if row + 1 >= buffer_rows {
queue!(writer, cursor::MoveTo(0, row + 1 - buffer_rows),)?;
} else {
let scroll_rows = buffer_rows - row - 1;
queue!(
writer,
terminal::ScrollUp(scroll_rows),
cursor::MoveTo(0, 0),
)?;
}
// No guarantee that text returned by render will not be re-layouted, so it is better to clear it.
queue!(writer, terminal::Clear(terminal::ClearType::FromCursorDown))?;
if text.contains('\n') {
let text = format!("{buffer}{text}");
let (head, tail) = split_line_tail(&text);
buffer = tail.to_string();
let output = render.render(head);
print_block(writer, &output, columns)?;
queue!(writer, style::Print(&buffer),)?;
// No guarantee the buffer width of the buffer will not exceed the number of columns.
// So we calcuate the number of rows needed, rather than setting it directly to 1.
buffer_rows = need_rows(&buffer, columns);
} else {
buffer = format!("{buffer}{text}");
let output = render.render_line(&buffer);
if output.contains('\n') {
let (head, tail) = split_line_tail(&output);
buffer_rows = print_block(writer, head, columns)?;
queue!(writer, style::Print(&tail),)?;
// Same as above.
buffer_rows += need_rows(tail, columns);
} else {
queue!(writer, style::Print(&output))?;
buffer_rows = need_rows(&output, columns);
}
}
writer.flush()?;
}
ReplyEvent::Done => {
#[cfg(target_os = "windows")]
let eol = "\n\n";
#[cfg(not(target_os = "windows"))]
let eol = "\n";
queue!(writer, style::Print(eol))?;
writer.flush()?;
break;
}
}
continue;
}
let timeout = tick_rate
.checked_sub(last_tick.elapsed())
.unwrap_or_else(|| Duration::from_secs(0));
if crossterm::event::poll(timeout)? {
if let Event::Key(key) = event::read()? {
match key.code {
KeyCode::Char('c') if key.modifiers == KeyModifiers::CONTROL => {
abort.set_ctrlc();
return Ok(());
}
KeyCode::Char('d') if key.modifiers == KeyModifiers::CONTROL => {
abort.set_ctrld();
return Ok(());
}
_ => {}
}
}
}
if last_tick.elapsed() >= tick_rate {
last_tick = Instant::now();
}
}
Ok(())
}
fn print_block(writer: &mut Stdout, text: &str, columns: u16) -> Result<u16> {
let mut num = 0;
for line in text.split('\n') {
queue!(
writer,
style::Print(line),
style::Print("\n"),
cursor::MoveLeft(columns),
)?;
num += 1;
}
Ok(num)
}
fn need_rows(text: &str, columns: u16) -> u16 {
let buffer_width = display_width(text) as u16;
(buffer_width + columns - 1) / columns
}
|
