Update custom homebrew taps

[achew22]

What would you like Renovate to be able to do?

It would be really nice if Renovate Bot could update a homebrew tap automatically so that the latest release is always what is available from homebrew.

Describe the solution you'd like

For binaries that are live as a github archive and are compiled (example) it would be really nice if you could detect those, find the latest version and send a PR to update it and the sha256 of the latest tag.

Describe alternatives you've considered

Doing it manually 😦

Additional context

Thanks so much!

[rarkins]

https://docs.brew.sh/How-to-Create-and-Maintain-a-Tap

[rarkins]

fileMatch: ^Formula/[^/]+\.rb$

Initially let's support github-hosted ones only, e.g.

class Ibazel < Formula
  desc 'IBazel is a tool for building Bazel targets when source files change.'
  homepage 'https://github.com/bazelbuild/bazel-watcher'
  url "https://github.com/bazelbuild/bazel-watcher/archive/v0.6.0.tar.gz"
  sha256 '819ae4ff201f62e769e627335b122c84a472671b80d6fa0407b157c0c982b219'

Note the inconsistent use of " vs ' above

Generating the sha256 seems similar to how we actually do it for bazel updates too.

Anecdote: the homebrew core project has nearly 3500 projects in in its Formula folder: https://github.com/Homebrew/homebrew-core/tree/master/Formula

[rarkins]

This will be a new manager named "homebrew" in lib/managers/homebrew

fileMatch: ^Formula/[^/]+\.rb$

Parse it line-by-line, look for any class X < Formula

If URL matches https://github.com/*/*/archive/<valid semver>.tar.gz then add it as a valid dep, otherwise skip it.

Use existing github datasource, filtering for releases.

The update will need to download the calculate the sha256 whenever the file has changed (don't recalculate if the file was already updated)

[renovate-bot]

🎉 This issue has been resolved in version 16.10.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀