watchexec/src/main.rs

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#![feature(process_exec)]
#[macro_use] extern crate clap;
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extern crate env_logger;
extern crate libc;
#[macro_use] extern crate log;
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#[macro_use] extern crate lazy_static;
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extern crate notify;
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#[cfg(unix)] extern crate nix;
#[cfg(windows)] extern crate winapi;
#[cfg(windows)] extern crate kernel32;
mod args;
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mod gitignore;
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mod interrupt_handler;
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mod notification_filter;
mod runner;
mod watcher;
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use std::sync::mpsc::{channel, Receiver, RecvError};
use std::{env, thread, time};
use std::path::{Path, PathBuf};
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use notification_filter::NotificationFilter;
use runner::Runner;
use watcher::{Event, Watcher};
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// Starting at the specified path, search for gitignore files,
// stopping at the first one found.
fn find_gitignore_file(path: &Path) -> Option<PathBuf> {
let mut gitignore_path = path.join(".gitignore");
if gitignore_path.exists() {
return Some(gitignore_path);
}
let p = path.to_owned();
while let Some(p) = p.parent() {
gitignore_path = p.join(".gitignore");
if gitignore_path.exists() {
return Some(gitignore_path);
}
}
None
}
fn init_logger(debug: bool) {
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let mut log_builder = env_logger::LogBuilder::new();
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let level = if debug {
log::LogLevelFilter::Debug
} else {
log::LogLevelFilter::Warn
};
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log_builder
.format(|r| format!("*** {}", r.args()))
.filter(None, level);
log_builder.init().expect("unable to initialize logger");
}
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fn main() {
let args = args::get_args();
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init_logger(args.debug);
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let cwd = env::current_dir()
.expect("unable to get cwd")
.canonicalize()
.expect("unable to canonicalize cwd");
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let mut gitignore_file = None;
if !args.no_vcs_ignore {
if let Some(gitignore_path) = find_gitignore_file(&cwd) {
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debug!("Found .gitignore file: {:?}", gitignore_path);
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gitignore_file = gitignore::parse(&gitignore_path).ok();
}
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}
let mut filter = NotificationFilter::new(&cwd, gitignore_file).expect("unable to create notification filter");
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for f in args.filters {
filter.add_filter(&f).expect("bad filter");
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}
for i in args.ignores {
filter.add_ignore(&i).expect("bad ignore pattern");
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}
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let (tx, rx) = channel();
let mut watcher = Watcher::new(tx, args.poll, args.poll_interval)
.expect("unable to create watcher");
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if watcher.is_polling() {
warn!("Polling for changes every {} ms", args.poll_interval);
}
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for path in args.paths {
match Path::new(&path).canonicalize() {
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Ok(canonicalized) => watcher.watch(canonicalized).expect("unable to watch path"),
Err(_) => {
println!("invalid path: {}", path);
return;
}
}
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}
let cmd = args.cmd;
let mut runner = Runner::new(args.restart, args.clear_screen);
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if args.run_initially {
runner.run_command(&cmd, vec![]);
}
while !interrupt_handler::interrupt_requested() {
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let e = wait(&rx, &filter).expect("error when waiting for filesystem changes");
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debug!("{:?}: {:?}", e.op, e.path);
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// TODO: update wait to return all paths
let updated: Vec<&str> = e.path
.iter()
.map(|p| p.to_str().unwrap())
.collect();
runner.run_command(&cmd, updated);
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}
}
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fn wait(rx: &Receiver<Event>, filter: &NotificationFilter) -> Result<Event, RecvError> {
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loop {
// Block on initial notification
let e = try!(rx.recv());
if let Some(ref path) = e.path {
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if filter.is_excluded(path) {
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continue;
}
}
// Accumulate subsequent events
thread::sleep(time::Duration::from_millis(250));
// Drain rx buffer and drop them
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while let Ok(_) = rx.try_recv() {
// nothing to do here
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}
return Ok(e);
}
}