Watch your files and run commands on changes from a crystal script

Installation

1. Add the dependency to your shard.yml:

   dependencies:
     watch:
       github: danreeves/watch

2. Run shards install

Usage

Create a crystal file to be your task manager, something like watch.cr

require "watch"

Watch.watch "./src/**/*.cr", "crystal build src/main.cr"
Watch.watch "./*", "echo \"wow a file changed\"", opts: [:verbose, :log_changes]
Watch.run

Now you can run it with crystal run watch.cr and rebuild your main application whenever a file changes. Useful for webservers like Kemal!

Every Watch.watch is run in it's own Fiber so you can have multiple tasks doing different things looking at different files.

Watch.watch(glob: String, command: String, opts: [], interval: Int32)

watch takes a glob of files to watch and a command to run. Configuration is provided by opts and includes:

• :on_start: Run the command immediately as well as on file changes
• :log_changes: Print a message when a file changes
• :verbose: Increases the verbosity of the message to includes how many files changed and whether they were new files, deletions, or changes.

Watch.run

Required to be called at the end of your watch script to prevent the process for finishing.

Contributing

1. Fork it (https://github.com/danreeves/watch/fork)
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Contributors

• Dan Reeves - creator and maintainer