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|
use super::{MarkdownRender, SseEvent};
use crate::utils::{poll_abort_signal, spawn_spinner, AbortSignal};
use anyhow::Result;
use crossterm::{
cursor, queue, style,
terminal::{self, disable_raw_mode, enable_raw_mode},
};
use std::{
io::{self, stdout, Stdout, Write},
time::Duration,
};
use textwrap::core::display_width;
use tokio::sync::mpsc::UnboundedReceiver;
pub async fn markdown_stream(
rx: UnboundedReceiver<SseEvent>,
render: &mut MarkdownRender,
abort_signal: &AbortSignal,
) -> Result<()> {
enable_raw_mode()?;
let mut stdout = io::stdout();
let ret = markdown_stream_inner(rx, render, abort_signal, &mut stdout).await;
disable_raw_mode()?;
if ret.is_err() {
println!();
}
ret
}
pub async fn raw_stream(
mut rx: UnboundedReceiver<SseEvent>,
abort_signal: &AbortSignal,
) -> Result<()> {
let mut spinner = Some(spawn_spinner(&match crate::utils::current_query_scope() {
Some(scope) => format!("{scope} Generating"),
None => "Generating".to_string(),
}));
loop {
if abort_signal.aborted() {
break;
}
if let Some(evt) = rx.recv().await {
if let Some(spinner) = spinner.take() {
spinner.stop();
}
match evt {
SseEvent::Text(text) => {
print!("{text}");
stdout().flush()?;
}
SseEvent::Done => {
break;
}
}
}
}
if let Some(spinner) = spinner.take() {
spinner.stop();
}
Ok(())
}
async fn markdown_stream_inner(
mut rx: UnboundedReceiver<SseEvent>,
render: &mut MarkdownRender,
abort_signal: &AbortSignal,
writer: &mut Stdout,
) -> Result<()> {
let mut buffer = String::new();
let mut buffer_rows = 1;
let columns = terminal::size()?.0;
let mut spinner = Some(spawn_spinner(&match crate::utils::current_query_scope() {
Some(scope) => format!("{scope} Generating"),
None => "Generating".to_string(),
}));
'outer: loop {
if abort_signal.aborted() {
break;
}
for reply_event in gather_events(&mut rx).await {
if let Some(spinner) = spinner.take() {
spinner.stop();
}
match reply_event {
SseEvent::Text(mut text) => {
// tab width hacking
text = text.replace('\t', " ");
let mut attempts = 0;
let (col, mut row) = loop {
match cursor::position() {
Ok(pos) => break pos,
Err(_) if attempts < 3 => attempts += 1,
Err(e) => return Err(e.into()),
}
};
// 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);
let output = render.render(head);
print_block(writer, &output, columns)?;
buffer = tail.to_string();
} 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),)?;
// No guarantee the buffer width of the buffer will not exceed the number of columns.
// So we calculate the number of rows needed, rather than setting it directly to 1.
buffer_rows += need_rows(tail, columns);
} else {
queue!(writer, style::Print(&output))?;
buffer_rows = need_rows(&output, columns);
}
writer.flush()?;
}
SseEvent::Done => {
break 'outer;
}
}
}
if poll_abort_signal(abort_signal)? {
break;
}
}
if let Some(spinner) = spinner.take() {
spinner.stop();
}
Ok(())
}
async fn gather_events(rx: &mut UnboundedReceiver<SseEvent>) -> Vec<SseEvent> {
let mut texts = vec![];
let mut done = false;
tokio::select! {
_ = async {
while let Some(reply_event) = rx.recv().await {
match reply_event {
SseEvent::Text(v) => texts.push(v),
SseEvent::Done => {
done = true;
break;
}
}
}
} => {}
_ = tokio::time::sleep(Duration::from_millis(50)) => {}
};
let mut events = vec![];
if !texts.is_empty() {
events.push(SseEvent::Text(texts.join("")))
}
if done {
events.push(SseEvent::Done)
}
events
}
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 split_line_tail(text: &str) -> (&str, &str) {
if let Some((head, tail)) = text.rsplit_once('\n') {
(head, tail)
} else {
("", text)
}
}
fn need_rows(text: &str, columns: u16) -> u16 {
let buffer_width = display_width(text).max(1) as u16;
buffer_width.div_ceil(columns)
}
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