132 lines
3.4 KiB
Rust
132 lines
3.4 KiB
Rust
use std::time::Duration;
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use crate::signal::process::SubSignal;
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/// The outcome to execute when an action is triggered.
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///
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/// Logic against the state of the command should be expressed using these variants, rather than
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/// inside the action handler, as it ensures the state of the command is always the latest available
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/// when the outcome is executed.
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#[derive(Clone, Debug, PartialEq, Eq)]
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#[non_exhaustive]
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pub enum Outcome {
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/// Stop processing this action silently.
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DoNothing,
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/// If the command is running, stop it.
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///
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/// This should be used with an `IfRunning`, and will warn if the command is not running.
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Stop,
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/// If the command isn't running, start it.
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///
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/// This should be used with an `IfRunning`, and will warn if the command is running.
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Start,
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/// Wait for command completion.
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///
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/// Does nothing if the command isn't running.
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Wait,
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/// Sleep for some duration.
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Sleep(Duration),
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/// Send this signal to the command.
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///
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/// This does not wait for the command to complete.
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Signal(SubSignal),
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/// Clear the (terminal) screen.
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Clear,
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/// Reset the (terminal) screen.
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///
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/// This invokes (in order): [`WindowsCooked`][clearscreen::ClearScreen::WindowsCooked],
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/// [`WindowsVt`][clearscreen::ClearScreen::WindowsVt],
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/// [`VtLeaveAlt`][clearscreen::ClearScreen::VtLeaveAlt],
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/// [`VtWellDone`][clearscreen::ClearScreen::VtWellDone],
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/// and [the default clear][clearscreen::ClearScreen::default()].
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Reset,
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/// Exit watchexec.
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Exit,
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/// When command is running, do the first, otherwise the second.
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IfRunning(Box<Outcome>, Box<Outcome>),
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/// Do both outcomes in order.
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Both(Box<Outcome>, Box<Outcome>),
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}
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impl Default for Outcome {
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fn default() -> Self {
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Self::DoNothing
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}
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}
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impl Outcome {
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/// Convenience function to create an outcome conditional on the state of the subprocess.
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#[must_use]
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pub fn if_running(then: Self, otherwise: Self) -> Self {
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Self::IfRunning(Box::new(then), Box::new(otherwise))
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}
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/// Convenience function to create a sequence of outcomes.
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#[must_use]
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pub fn both(one: Self, two: Self) -> Self {
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Self::Both(Box::new(one), Box::new(two))
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}
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/// Convenience function to wait for the subprocess to complete before executing the outcome.
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#[must_use]
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pub fn wait(and_then: Self) -> Self {
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Self::Both(Box::new(Self::Wait), Box::new(and_then))
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}
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/// Resolves the outcome given the current state of the subprocess.
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#[must_use]
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pub fn resolve(self, is_running: bool) -> Self {
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match (is_running, self) {
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(true, Self::IfRunning(then, _)) => then.resolve(true),
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(false, Self::IfRunning(_, otherwise)) => otherwise.resolve(false),
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(ir, Self::Both(one, two)) => Self::both(one.resolve(ir), two.resolve(ir)),
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(_, other) => other,
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}
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn simple_if_running() {
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assert_eq!(
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Outcome::if_running(Outcome::Stop, Outcome::Start).resolve(true),
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Outcome::Stop
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);
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assert_eq!(
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Outcome::if_running(Outcome::Stop, Outcome::Start).resolve(false),
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Outcome::Start
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);
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}
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#[test]
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fn simple_passthrough() {
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assert_eq!(Outcome::Wait.resolve(true), Outcome::Wait);
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assert_eq!(Outcome::Clear.resolve(false), Outcome::Clear);
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}
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#[test]
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fn nested_if_runnings() {
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assert_eq!(
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Outcome::both(
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Outcome::if_running(Outcome::Stop, Outcome::Start),
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Outcome::if_running(Outcome::Wait, Outcome::Exit)
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)
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.resolve(true),
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Outcome::Both(Box::new(Outcome::Stop), Box::new(Outcome::Wait))
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);
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}
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}
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