Watchy

Run commands when paths change.

Install

You'll need to install Node.js to use Watchy. Node comes packaged with npm, which is Node's package manager, and the preferred method of installing Watchy. After installing Node, simply type

npm install -g watchy

and you should have the watchy command available!

Usage

Usage: watchy [options] -- <command> [args...]

Run commands when paths change.

Options:
  -V, --version                   output the version number
  -d, --debounce [seconds]        trigger a change at most every [seconds] seconds
  -k, --keep-alive                restart the process if it exits
  -r, --restart [string]          send [string] to STDIN to restart the process
  -R, --no-restart-after-signal   disable process restart after being signaled and exited
  -s, --silent                    only output errors
  -S, --no-init-spawn             prevent spawn when the watcher is created
  -t, --shutdown-signal [signal]  use [signal] to shut down the process (default: "SIGTERM")
  -T, --reload-signal [signal]    use [signal] to reload the process (defaults to shutdown
                                  signal)
  -w, --watch [pattern]           watch [pattern] for changes, can be specified multiple times
  -W, --wait [seconds]            send SIGKILL to the process after [seconds] if it hasn't
                                  exited
  -h, --help                      display help for command

The watch patterns are extglob format.

Examples

# The simple case
watchy -w 'lib/**/*' -- say "The lib directory changed."

# Piping works as well
watchy -w 'styles/**/*.less' -- bash -c "lessc styles/main.less | autoprefixer -o .tmp/styles/main.css"

# Keep a process alive, restarting it as soon as it exits or "server.js"
# changes.
watchy -kw server.js -- node server.js

# Watch every file except dotfiles, the node_modules folder, and JSON files.
# NOTE: Listen to as few files as possible for better performance.
watchy -w . -i '/\.|/node_modules|\.json$' -- node server.js

# Tick tock!
watchy -ks -- bash -c 'date && sleep 1'

# Tick tock (annoying version)!
watchy -ks -- bash -c 'say "In case you were wondering, it is `date`" && sleep 5'

# The envvar WATCHY_PATHS is passed to the process.
watchy -S -w '**/*' -- bash -c 'echo $WATCHY_PATHS changed'
# => modified /Users/casey/Documents/code/watchy/README.md

Note: If you're using watchy for help with preprocessing, I'd recommend checking out my cogs project that is highly optimized for that case with in-memory processed file caching, directives, AMD support, and much more.

SIGTERM

By default, watchy will send SIGTERM to the running process after a change and wait for it to exit gracefully. By sending the --wait|-W n option, you can tell watchy to forcefully SIGKILL the process after n seconds. In general, you should try to clean up connections in your processes like so:

process.on('SIGTERM', () => {
  server.close();
  db.disconnect();
  redis.quit();
  // etc...
});

Node API

As of 0.9.0 watchy exposes a Node.js API.

import { watch } from 'watchy';

watch({
  debounce: 0.5,
  onChange: paths => console.log(paths),
  patterns: ['js/**/*.js', 'css/**/*.css'],
});