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homebrew-cask/CONTRIBUTING.md

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How To Contribute

👍🎉 First off, thanks for taking the time to contribute! 🎉👍

Updating a Cask

Notice an application that's out-of-date in Homebrew-Cask? In most cases, it's very simple to update it. We have a script that will ask for the new version number, and take care of updating the Cask file and submitting a pull request to us:

# install and setup script - only needed once
brew install vitorgalvao/tiny-scripts/cask-repair
cask-repair --help

# fork homebrew-cask to your account - only needed once
cd "$(brew --repository)/Library/Taps/caskroom/homebrew-cask/Casks"
hub fork

# use to update <outdated_cask>
outdated_cask='<the-cask-i-want-to-update>'
github_user='<my-github-username>'
cd "$(brew --repository)/Library/Taps/caskroom/homebrew-cask/Casks"

cask-repair --pull origin --push $github_user $outdated_cask

If there is a more complicated change, or there is a case where cask-repair fails, you can also follow the steps in Adding a Cask to do the same thing manually. Remember to update the version and shasum values, as well as the appcast checkpoint, if there is one.

Getting Set Up To Contribute

For manual updates, you'll need to fork the repository and add your copy as a remote (can also be done with hub fork).

  1. Fork the repository in GitHub with the Fork button.

  2. Add your GitHub fork as a remote for your homebrew-cask Tap:

$ github_user='<my-github-username>'
$ cd "$(brew --repository)"/Library/Taps/caskroom/homebrew-cask
$ git remote add "$github_user" "https://github.com/$github_user/homebrew-cask"
  1. Switch to a new branch (ie. new-feature), and work from there: git checkout -b new-feature

Adding a Cask

Notice an application that's not in Homebrew-Cask yet? Make sure it's not yet in Homebrew-Versions (can be searched from the Github repository page) or Homebrew (can be searched with brew search). Mac App Store apps can't be installed via Homebrew-Cask, but check out mas for an alternative.

With a bit of work, you can create a Cask for it. This document will walk you through creating a new Cask, testing it, and submitting it to us.

Style guide

Some style guidelines:

  • All Casks and code should be indented using two spaces (never tabs)
  • There should not be any extraneous comments - the only comments that should be used are the ones explicitly defined in the Cask Language Reference
  • The stanza order and position of newlines is important to make things easier (See Stanza order)
  • Use string manipulations to improve the maintainability of your Cask (See version methods)
  • Test your cask using brew cask audit/style (See testing)
  • Make one Pull Request per Cask change
  • Squash commits after updating a Pull Request
  • Use descriptive commit messages - mention app name and version (ie. Upgrade Transmission.app to v2.82)