Feature request: bulk delete old branches

[nathanl]

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It is common for repos to accumulate dead branches. These are clutter for developers and also force GitHub to retain the commits on those branches in storage. git branch -a --merged will not identify them if they were squash merged. In that case, deleting them requires a human judgment call. Right now, this requires tedious git push origin :dead_branch_name commands.

I request a "branch cleanup" tool that lists all branches by the age of their last commit. For each branch, info about the last commit (message, committer, date) should be shown. Users could check a box next to each branch to be deleted and bulk delete them.

As evidence that this feature would be popular, the StackOverflow question How do I remove all stale branches from Github? has been viewed 22k times.

I believe this feature would also free up storage space for GitHub as many old, irrelevant commits could then be removed with git gc.

[nathanl]

I just realized that /branches on any repo provides a reasonable way to do this.