355 lines
8.5 KiB
Rust
355 lines
8.5 KiB
Rust
use std::{
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collections::HashMap, convert::Infallible, env::current_dir, ffi::OsString, path::Path,
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str::FromStr, string::ToString, time::Duration,
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};
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use clap::ArgMatches;
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use miette::{miette, IntoDiagnostic, Result};
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use notify_rust::Notification;
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use tracing::{debug, debug_span};
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use watchexec::{
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action::{Action, Outcome, PostSpawn, PreSpawn},
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command::{Command, Shell},
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config::RuntimeConfig,
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error::RuntimeError,
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event::{Event, ProcessEnd, Tag},
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fs::Watcher,
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handler::SyncFnHandler,
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keyboard::Keyboard,
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paths::summarise_events_to_env,
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signal::{process::SubSignal, source::MainSignal},
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};
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pub fn runtime(args: &ArgMatches) -> Result<RuntimeConfig> {
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let _span = debug_span!("args-runtime").entered();
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let mut config = RuntimeConfig::default();
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config.command(interpret_command_args(args)?);
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config.pathset(match args.values_of_os("paths") {
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Some(paths) => paths.map(|os| Path::new(os).to_owned()).collect(),
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None => vec![current_dir().into_diagnostic()?],
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});
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config.action_throttle(Duration::from_millis(
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args.value_of("debounce")
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.unwrap_or("50")
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.parse()
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.into_diagnostic()?,
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));
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config.keyboard_emit_eof(args.is_present("stdin-quit"));
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if let Some(interval) = args.value_of("poll") {
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config.file_watcher(Watcher::Poll(Duration::from_millis(
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interval.parse().into_diagnostic()?,
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)));
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}
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if args.is_present("no-process-group") {
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config.command_grouped(false);
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}
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let clear = args.is_present("clear");
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let notif = args.is_present("notif");
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let on_busy = if args.is_present("restart") {
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"restart"
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} else if args.is_present("watch-when-idle") {
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"do-nothing"
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} else {
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args.value_of("on-busy-update").unwrap_or("queue")
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}
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.to_owned();
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let signal = if args.is_present("kill") {
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Some(SubSignal::ForceStop)
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} else {
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args.value_of("signal")
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.map(SubSignal::from_str)
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.transpose()
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.into_diagnostic()?
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};
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let print_events = args.is_present("print-events");
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let once = args.is_present("once");
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let delay_run = args
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.value_of("delay-run")
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.map(u64::from_str)
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.transpose()
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.into_diagnostic()?
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.map(Duration::from_secs);
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config.on_action(move |action: Action| {
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let fut = async { Ok::<(), Infallible>(()) };
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if print_events {
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for (n, event) in action.events.iter().enumerate() {
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eprintln!("[EVENT {n}] {event}");
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}
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}
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if once {
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action.outcome(Outcome::both(
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if let Some(delay) = &delay_run {
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Outcome::both(Outcome::Sleep(*delay), Outcome::Start)
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} else {
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Outcome::Start
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},
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Outcome::wait(Outcome::Exit),
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));
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return fut;
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}
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let signals: Vec<MainSignal> = action.events.iter().flat_map(Event::signals).collect();
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let has_paths = action.events.iter().flat_map(Event::paths).next().is_some();
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if signals.contains(&MainSignal::Terminate) {
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action.outcome(Outcome::both(Outcome::Stop, Outcome::Exit));
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return fut;
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}
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if signals.contains(&MainSignal::Interrupt) {
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action.outcome(Outcome::both(Outcome::Stop, Outcome::Exit));
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return fut;
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}
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let is_keyboard_eof = action
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.events
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.iter()
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.any(|e| e.tags.contains(&Tag::Keyboard(Keyboard::Eof)));
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if is_keyboard_eof {
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action.outcome(Outcome::both(Outcome::Stop, Outcome::Exit));
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return fut;
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}
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if !has_paths {
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if !signals.is_empty() {
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let mut out = Outcome::DoNothing;
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for sig in signals {
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out = Outcome::both(out, Outcome::Signal(sig.into()));
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}
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action.outcome(out);
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return fut;
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}
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let completion = action.events.iter().flat_map(Event::completions).next();
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if let Some(status) = completion {
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let (msg, printit) = match status {
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Some(ProcessEnd::ExitError(code)) => {
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(format!("Command exited with {code}"), true)
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}
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Some(ProcessEnd::ExitSignal(sig)) => {
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(format!("Command killed by {sig:?}"), true)
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}
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Some(ProcessEnd::ExitStop(sig)) => {
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(format!("Command stopped by {sig:?}"), true)
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}
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Some(ProcessEnd::Continued) => ("Command continued".to_string(), true),
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Some(ProcessEnd::Exception(ex)) => {
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(format!("Command ended by exception {ex:#x}"), true)
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}
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Some(ProcessEnd::Success) => ("Command was successful".to_string(), false),
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None => ("Command completed".to_string(), false),
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};
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if printit {
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eprintln!("[[{msg}]]");
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}
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if notif {
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Notification::new()
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.summary("Watchexec: command ended")
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.body(&msg)
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.show()
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.map_or_else(
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|err| {
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eprintln!("[[Failed to send desktop notification: {err}]]");
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},
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drop,
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);
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}
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action.outcome(Outcome::DoNothing);
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return fut;
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}
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}
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let start = if clear {
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Outcome::both(Outcome::Clear, Outcome::Start)
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} else {
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Outcome::Start
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};
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let start = if let Some(delay) = &delay_run {
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Outcome::both(Outcome::Sleep(*delay), start)
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} else {
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start
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};
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let when_idle = start.clone();
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let when_running = match on_busy.as_str() {
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"restart" => Outcome::both(
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if let Some(sig) = signal {
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Outcome::both(
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Outcome::Signal(sig),
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Outcome::both(Outcome::Sleep(Duration::from_secs(60)), Outcome::Stop),
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)
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} else {
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Outcome::Stop
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},
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start,
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),
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"signal" => Outcome::Signal(signal.unwrap_or(SubSignal::Terminate)),
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"queue" => Outcome::wait(start),
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// "do-nothing" => Outcome::DoNothing,
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_ => Outcome::DoNothing,
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};
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action.outcome(Outcome::if_running(when_running, when_idle));
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fut
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});
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let mut add_envs = HashMap::new();
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for pair in args.values_of("command-env").unwrap_or_default() {
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if let Some((k, v)) = pair.split_once('=') {
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add_envs.insert(k.to_owned(), OsString::from(v));
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} else {
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return Err(miette!("{pair} is not in key=value format"));
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}
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}
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debug!(
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?add_envs,
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"additional environment variables to add to command"
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);
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let workdir = args
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.value_of_os("command-workdir")
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.map(|wkd| Path::new(wkd).to_owned());
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let no_env = args.is_present("no-environment");
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config.on_pre_spawn(move |prespawn: PreSpawn| {
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let add_envs = add_envs.clone();
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let workdir = workdir.clone();
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async move {
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if !no_env || !add_envs.is_empty() || workdir.is_some() {
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if let Some(mut command) = prespawn.command().await {
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let mut envs = add_envs.clone();
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if !no_env {
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envs.extend(
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summarise_events_to_env(prespawn.events.iter())
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.into_iter()
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.map(|(k, v)| (format!("WATCHEXEC_{k}_PATH"), v)),
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);
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}
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for (k, v) in envs {
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debug!(?k, ?v, "inserting environment variable");
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command.env(k, v);
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}
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if let Some(ref workdir) = workdir {
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debug!(?workdir, "set command workdir");
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command.current_dir(workdir);
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}
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}
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}
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Ok::<(), Infallible>(())
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}
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});
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config.on_post_spawn(SyncFnHandler::from(move |postspawn: PostSpawn| {
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if notif {
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Notification::new()
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.summary("Watchexec: change detected")
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.body(&format!("Running {}", postspawn.command))
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.show()
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.map_or_else(
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|err| {
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eprintln!("[[Failed to send desktop notification: {err}]]");
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},
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drop,
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);
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}
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Ok::<(), Infallible>(())
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}));
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Ok(config)
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}
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fn interpret_command_args(args: &ArgMatches) -> Result<Command> {
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let mut cmd = args
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.values_of("command")
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.expect("(clap) Bug: command is not present")
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.map(ToString::to_string)
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.collect::<Vec<_>>();
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Ok(if args.is_present("no-shell") {
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Command::Exec {
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prog: cmd.remove(0),
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args: cmd,
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}
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} else {
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let (shell, shopts) = if let Some(s) = args.value_of("shell") {
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if s.is_empty() {
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return Err(RuntimeError::CommandShellEmptyShell).into_diagnostic();
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} else if s.eq_ignore_ascii_case("powershell") {
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(Shell::Powershell, Vec::new())
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} else if s.eq_ignore_ascii_case("none") {
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return Ok(Command::Exec {
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prog: cmd.remove(0),
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args: cmd,
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});
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} else if s.eq_ignore_ascii_case("cmd") {
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(cmd_shell(s.into()), Vec::new())
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} else {
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let sh = s.split_ascii_whitespace().collect::<Vec<_>>();
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// UNWRAP: checked by first if branch
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#[allow(clippy::unwrap_used)]
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let (shprog, shopts) = sh.split_first().unwrap();
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(
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Shell::Unix((*shprog).to_string()),
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shopts.iter().map(|s| (*s).to_string()).collect(),
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)
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}
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} else {
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(default_shell(), Vec::new())
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};
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Command::Shell {
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shell,
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args: shopts,
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command: cmd.join(" "),
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}
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})
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}
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// until 2.0, then Powershell
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#[cfg(windows)]
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fn default_shell() -> Shell {
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Shell::Cmd
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}
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#[cfg(not(windows))]
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fn default_shell() -> Shell {
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Shell::Unix("sh".to_string())
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}
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// because Shell::Cmd is only on windows
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#[cfg(windows)]
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fn cmd_shell(_: String) -> Shell {
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Shell::Cmd
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}
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#[cfg(not(windows))]
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fn cmd_shell(s: String) -> Shell {
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Shell::Unix(s)
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}
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