mod assets;
mod relay;
mod watcher;
use std::io;
use std::process::{Command, Stdio};
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Arc;
use std::thread;
use std::time::Duration;
use anyhow::{Context, Result};
use crate::cli::WatchArgs;
use crate::typst::compile::{
reject_reserved_typst_inputs, resolve_output_path, typst_watch_args, ReservedInputs,
};
use crate::typst::preprocess::{
execute_preprocess_plan, prepare_preprocess_plan, preprocess, PreprocessOptions,
};
use crate::typst::version::assert_supported_typst;
use crate::utils::{process, tools};
use relay::{join_relay, relay_typst_watch_output};
fn preprocess_options(args: &WatchArgs, sync_pages: bool) -> PreprocessOptions {
PreprocessOptions {
input: args.input.clone(),
root: None,
config: args.common.config.clone(),
display_root: None,
quiet: args.common.quiet,
status: true,
progress: false,
timeout: args.common.timeout,
sync_pages,
theme: None,
fallback_theme: crate::theme::ThemeSelection::Default,
html_syntax_theme: None,
param_overrides: args.common.params.clone(),
}
}
pub fn run_watch(args: WatchArgs) -> Result<()> {
let format = args.format.map(|format| format.as_str().to_string());
let sync_pages = format.as_deref().unwrap_or("pdf") == "pdf";
reject_reserved_typst_inputs(&args.typst_args)?;
let initial = preprocess(preprocess_options(&args, sync_pages))?;
let stop = Arc::new(AtomicBool::new(false));
let stop_for_handler = Arc::clone(&stop);
ctrlc::set_handler(move || {
stop_for_handler.store(true, Ordering::Relaxed);
})
.context("failed to set Ctrl+C handler")?;
let resolved_output =
resolve_output_path(&initial.layout, args.output.as_deref(), format.as_deref());
let root = initial.layout.root.clone();
let asset_server = if format.as_deref() == Some("html") {
let server = assets::start(root.clone(), Arc::clone(&stop))?;
if !args.common.quiet {
eprintln!("serving Calepin assets at {}", server.base_url());
}
Some(server)
} else {
None
};
let watch_args = typst_watch_args(
&initial.layout,
args.output.as_deref(),
format.as_deref(),
&args.typst_args,
ReservedInputs {
asset_base: asset_server.as_ref().map(|server| server.base_url()),
..ReservedInputs::default()
},
);
assert_supported_typst(&initial.executables.typst)?;
process::validate_executable(
&initial.executables.typst,
"start typst watch",
Some(&tools::TYPST),
)?;
let child = Command::new(&initial.executables.typst)
.args(&watch_args)
.current_dir(&root)
.stdin(Stdio::inherit())
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.spawn()
.map_err(|error| {
process::spawn_error(
&initial.executables.typst,
"start typst watch",
error,
Some(&tools::TYPST),
)
});
let mut child = match child {
Ok(child) => child,
Err(error) => {
stop.store(true, Ordering::Relaxed);
if let Some(server) = asset_server {
server.join();
}
return Err(error);
}
};
let stdout = child
.stdout
.take()
.context("failed to capture typst watch stdout")?;
let stderr = child
.stderr
.take()
.context("failed to capture typst watch stderr")?;
let stdout_relay = thread::spawn(move || relay_typst_watch_output(stdout, io::stdout()));
let stderr_relay = thread::spawn(move || relay_typst_watch_output(stderr, io::stderr()));
let watcher_stop = Arc::clone(&stop);
let watcher_args = args.clone();
let watcher_root = root.clone();
let watcher_output = resolved_output.clone();
let quiet = args.common.quiet;
let watcher = thread::spawn(move || {
let options = preprocess_options(&watcher_args, sync_pages);
let mut last_fingerprint = initial.fingerprint;
let result = watcher::watch_root(
&watcher_root,
&watcher_output,
watcher_args.common.config.as_deref(),
Arc::clone(&watcher_stop),
move |changed| match prepare_preprocess_plan(options.clone()) {
Ok(plan) => {
if plan.fingerprint == last_fingerprint && plan.layout.results_path.exists() {
return;
}
if !quiet {
let names = changed
.iter()
.filter_map(|path| path.file_name())
.map(|name| name.to_string_lossy().to_string())
.collect::<Vec<_>>()
.join(", ");
eprintln!("rebuilding {names}...");
}
match execute_preprocess_plan(plan) {
Ok(output) => {
last_fingerprint = output.fingerprint;
}
Err(error) => {
cwarn!("rebuild failed: {}", error);
}
}
}
Err(error) => {
cwarn!("rebuild failed: {}", error);
}
},
);
if let Err(error) = result {
cwarn!("watch error: {}", error);
}
});
loop {
if stop.load(Ordering::Relaxed) {
break;
}
match child.try_wait() {
Ok(Some(_status)) => break,
Ok(None) => thread::sleep(Duration::from_millis(200)),
Err(error) => {
cwarn!("failed to poll typst watch: {}", error);
break;
}
}
}
stop.store(true, Ordering::Relaxed);
let _ = child.kill();
let _ = child.wait();
join_relay("stdout", stdout_relay);
join_relay("stderr", stderr_relay);
let _ = watcher.join();
if let Some(server) = asset_server {
server.join();
}
Ok(())
}