git-branch-cleanup

#!/usr/bin/ruby -w

require 'optparse'

options = {}

option_parser = OptionParser.new do |parser|
	parser.banner = "Usage: git-branch-cleanup [options]

Deletes already-merged branches from local repository.

This is useful if you have merged branches into master
and thus no longer need this one.

Will not delete branches that have not been merged.
"

  parser.on("-h", "--help", "Print program help") do
      puts parser.help
      exit(0)
  end
end

option_parser.parse!

unless options.empty?
  # Do something with the options
end

current_branch = nil
branches = []

# Figure out the current branch
#
begin
  %x{git branch --merged}.split("\n").each { |line|
    if line.include?("*")
      branch = line.sub(/\*\s+/, '')
      current_branch = branch
    else
      branch = line.sub(/\s+/, '')
      branches << branch
    end
  }
rescue => detail
  puts "Could not get branch list: #{detail}"
  exit(1)
end

unless current_branch == "master"
  raise "Must be on master branch to delete unused branches"
end

# This is a bit counter-intuitive. We just try to delete everything,
# and rely on the behavior of git to refuse to delete branches that
# haven't been merged. If we encounter one of those, we just keep moving.
branches.each do |branch|
  begin
    system("git branch -d #{branch}")
  rescue => detail
    puts "Could not delete branch #{branch}: #{detail}"
    exit(2)
  end
end