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watchexec

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Executes commands in response to file modifications

// repository documentation

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# Watchexec

Software development often involves running the same commands over and over. Boring!

`watchexec` is a simple, standalone tool that watches a path and runs a command whenever it detects modifications.

Example use cases:

* Automatically run unit tests
* Run linters/syntax checkers
* Rebuild artifacts

## Features

* Simple invocation and use, does not require a cryptic command line involving `xargs`
* Runs on OS X, Linux, and Windows
* Monitors current directory and all subdirectories for changes
* Coalesces multiple filesystem events into one, for editors that use swap/backup files during saving
* Loads `.gitignore` and `.ignore` files
* Uses process groups to keep hold of forking programs
* Provides the paths that changed in environment variables or STDIN
* Does not require a language runtime, not tied to any particular language or ecosystem
* [And more!](./crates/cli/#features)

## Quick start

Watch all JavaScript, CSS and HTML files in the current directory and all subdirectories for changes, running `npm run build` when a change is detected:

$ watchexec -e js,css,html npm run build

Call/restart `python server.py` when any Python file in the current directory (and all subdirectories) changes:

$ watchexec -r -e py -- python server.py

More usage examples: [in the CLI README](./crates/cli/#usage-examples)!

## Install

- With [your package manager](./doc/packages.md) for Arch, Debian, Homebrew, Nix, Scoop, Chocolatey…
- From binary with [Binstall](https://github.com/cargo-bins/cargo-binstall): `cargo binstall watchexec-cli` 
- As [pre-built binary package from Github](https://github.com/watchexec/watchexec/releases/latest)
- From source with Cargo: `cargo install --locked watchexec-cli`

All options in detail: [in the CLI README](./crates/cli/#installation),
in the online help (`watchexec -h`, `watchexec --help`, or `watchexec --manual`),
and [in the manual page](./doc/watchexec.1.md).

## Augment

Watchexec pairs well with:

- [checkexec](https://github.com/kurtbuilds/checkexec): to run only when source files are newer than a target file
- [just](https://github.com/casey/just): a modern alternative to `make`
- [systemfd](https://github.com/mitsuhiko/systemfd): socket-passing in development

## Extend

- [watchexec library](./crates/lib/): to create more specialised watchexec-powered tools.
  - [watchexec-events](./crates/events/): event types for watchexec.
  - [watchexec-signals](./crates/signals/): signal types for watchexec.
  - [watchexec-supervisor](./crates/supervisor/): process lifecycle manager (the _exec_ part of watchexec).
- [clearscreen](https://github.com/watchexec/clearscreen): to clear the (terminal) screen on every platform.
- [command group](https://github.com/watchexec/command-group): to run commands in process groups.
- [ignore files](./crates/ignore-files/): to find, parse, and interpret ignore files.
- [project origins](./crates/project-origins/): to find the origin(s) directory of a project.
- [notify](https://github.com/notify-rs/notify): to respond to file modifications (third-party).

### Downstreams

Selected downstreams of watchexec and associated crates:

- [cargo watch](https://github.com/watchexec/cargo-watch): a specialised watcher for Rust/Cargo projects.
- [cargo lambda](https://github.com/cargo-lambda/cargo-lambda): a dev tool for Rust-powered AWS Lambda functions.
- [create-rust-app](https://create-rust-app.dev): a template for Rust+React web apps.
- [devenv.sh](https://github.com/cachix/devenv): a developer environment with nix-based declarative configs.
- [dotter](https://github.com/supercuber/dotter): a dotfile manager.
- [ghciwatch](https://github.com/mercurytechnologies/ghciwatch): a specialised watcher for Haskell projects.
- [tectonic](https://tectonic-typesetting.github.io/book/latest/): a TeX/LaTeX typesetting system.

watchexec

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