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|
use anyhow::Result;
use crossbeam::sync::WaitGroup;
use crossterm::{
cursor,
event::{self, Event, KeyCode, KeyEvent, KeyModifiers},
execute, queue, style,
terminal::{
self, disable_raw_mode, enable_raw_mode, size, ClearType, EnterAlternateScreen,
LeaveAlternateScreen,
},
};
use mdcat::{
push_tty,
terminal::{TerminalProgram, TerminalSize},
Environment, ResourceAccess, Settings,
};
use pulldown_cmark::Parser;
use std::{
io::{self, Write},
sync::{
atomic::{AtomicBool, Ordering},
mpsc::Receiver,
Arc,
},
thread,
time::Duration,
};
use syntect::parsing::SyntaxSet;
use crate::repl::{dump, ReplyEvent};
pub fn render_stream(
rx: Receiver<ReplyEvent>,
ctrlc: Arc<AtomicBool>,
markdown_render: Arc<MarkdownRender>,
) -> Result<()> {
let wg = WaitGroup::new();
let ctrlc_clone = ctrlc.clone();
let stream_done = Arc::new(AtomicBool::new(false));
let stream_done_clone = stream_done.clone();
let wg_clone = wg.clone();
thread::spawn(move || {
let _ = detect_ctrlc(ctrlc_clone, stream_done_clone);
drop(wg_clone);
});
let ret = render_stream_inner(rx, ctrlc, markdown_render);
stream_done.store(true, Ordering::SeqCst);
wg.wait();
ret
}
fn detect_ctrlc(ctrlc: Arc<AtomicBool>, stream_done: Arc<AtomicBool>) -> Result<()> {
loop {
if ctrlc.load(Ordering::SeqCst) || stream_done.load(Ordering::SeqCst) {
return Ok(());
}
if event::poll(Duration::from_millis(100))? {
if let Event::Key(KeyEvent {
code: KeyCode::Char('c'),
modifiers: KeyModifiers::CONTROL,
..
}) = event::read()?
{
ctrlc.store(true, Ordering::SeqCst);
break;
}
}
}
Ok(())
}
fn render_stream_inner(
rx: Receiver<ReplyEvent>,
ctrlc: Arc<AtomicBool>,
markdown_render: Arc<MarkdownRender>,
) -> Result<()> {
// setup terminal
enable_raw_mode()?;
let mut output = String::new();
let mut stdout = io::stdout();
execute!(stdout, EnterAlternateScreen)?;
fn clear(stdout: &mut impl Write) -> io::Result<()> {
queue!(
stdout,
style::ResetColor,
terminal::Clear(ClearType::All),
cursor::Hide,
cursor::MoveTo(0, 0)
)
}
clear(&mut stdout)?;
while let Ok(ev) = rx.recv() {
if ctrlc.load(Ordering::SeqCst) {
break;
}
match ev {
ReplyEvent::Text(text) => {
output.push_str(&text);
let rows = size()?.1 as usize;
let lines: Vec<&str> = output.split('\n').collect();
let len = lines.len();
let skip = if len > rows { len - rows } else { 0 };
let mut selected_lines = vec![];
let mut count_begin_code = 0;
let mut code = None;
for (index, line) in lines.iter().enumerate() {
if index < skip {
if line.starts_with("```") {
count_begin_code += 1;
code = Some(*line);
}
} else {
selected_lines.push(*line);
}
}
if count_begin_code % 2 == 1 {
if let Some(code) = code {
selected_lines[0] = code
}
};
let content = selected_lines.join("\n");
let markdown = markdown_render.render(&content)?;
if text.contains('\n') {
clear(&mut stdout)?;
for line in markdown.split('\n') {
queue!(stdout, style::Print(line), cursor::MoveToNextLine(1))?;
}
} else if let Some(line) = markdown.split('\n').last() {
queue!(
stdout,
style::ResetColor,
terminal::Clear(ClearType::CurrentLine),
cursor::MoveToColumn(0),
style::Print(line)
)?;
}
stdout.flush()?;
}
ReplyEvent::Done => {
break;
}
}
}
execute!(stdout, style::ResetColor, cursor::Show)?;
// restore terminal
disable_raw_mode()?;
execute!(stdout, LeaveAlternateScreen)?;
Ok(())
}
pub struct MarkdownRender {
env: Environment,
settings: Settings,
}
impl MarkdownRender {
pub fn init() -> Result<Self> {
let terminal = TerminalProgram::detect();
let env =
Environment::for_local_directory(&std::env::current_dir().expect("Working directory"))?;
let settings = Settings {
resource_access: ResourceAccess::LocalOnly,
syntax_set: SyntaxSet::load_defaults_newlines(),
terminal_capabilities: terminal.capabilities(),
terminal_size: TerminalSize::default(),
};
Ok(Self { env, settings })
}
pub fn print(&self, input: &str) -> Result<()> {
let markdown = self.render(input)?;
dump(markdown, 0);
Ok(())
}
pub fn render(&self, input: &str) -> Result<String> {
let source = Parser::new(input);
let mut sink = Vec::new();
push_tty(&self.settings, &self.env, &mut sink, source)?;
Ok(String::from_utf8_lossy(&sink).into())
}
}
|
