89 lines
3.2 KiB
Markdown
89 lines
3.2 KiB
Markdown
#watchexec
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[](https://travis-ci.org/mattgreen/watchexec)
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[](https://ci.appveyor.com/project/mattgreen/watchexec)
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[](https://crates.io/crates/watchexec)
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Software development often involves running the same commands over and over. Boring!
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`watchexec` is a **simple**, standalone tool that watches a path and runs a command whenever it detects modifications.
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Example use cases:
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* Automatically run unit tests
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* Run linters/syntax checkers
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##Features
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* Simple invocation and use
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* Runs on OS X, Linux and Windows
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* Monitors current directory and all subdirectories for changes
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* Uses most efficient event polling mechanism for your platform (except for [BSD](https://github.com/passcod/rsnotify#todo))
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* Coalesces multiple filesystem events into one, for editors that use swap/backup files during saving
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* By default, uses `.gitignore` to determine which files to ignore notifications for
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* Support for watching files with a specific extension
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* Support for filtering/ignoring events based on glob patterns
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* Launches child processes in a new process group
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* Sets the following environment variables in the child process:
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* `$WATCHEXEC_UPDATED_PATH` the path of the first file that triggered a change
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* `$WATCHEXEC_COMMON_PATH` the longest common path of all of the files that triggered a change
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* Optionally clears screen between executions
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* Optionally restarts the command with every modification (good for servers)
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* Does not require a language runtime
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##Anti-Features
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* Not tied to any particular language or ecosystem
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* Does not require a cryptic command line involving `xargs`
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##Usage Examples
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Watch all JavaScript, CSS and HTML files in the current directory and all subdirectories for changes, running `make` when a change is detected:
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$ watchexec --exts js,css,html make
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Call `make test` when any file changes in this directory/subdirectory, except for everything below `target`:
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$ watchexec -i target make test
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Call `ls -la` when any file changes in this directory/subdirectory:
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$ watchexec -- ls -la
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Call/restart `python server.py` when any Python file in the current directory (and all subdirectories) changes:
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$ watchexec -e py -r python server.py
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Run `make` when any file changes, using the `.gitignore` file in the current directory to filter:
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$ watchexec make
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##Installation
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###Cargo
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watchexec requires Rust 1.9 or later. You can install it using cargo:
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$ cargo install watchexec
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###OS X with Homebrew
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$ brew install https://raw.githubusercontent.com/mattgreen/watchexec/master/pkg/brew/watchexec.rb
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###Linux
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For now, use the GitHub Releases tab to obtain the binary. PRs for packaging in various distros are welcomed.
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###Windows
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Use the GitHub Releases tab to obtain the binary. In the future, I'll look at adding it to Chocolatey.
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##Building
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Rust 1.9 or later is required.
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##Credits
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* [notify](https://github.com/passcod/rsnotify) for doing most of the heavy-lifting
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* [globset](https://crates.io/crates/globset) for super-fast glob matching
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