Kill branches which exist on your origin but not locally

kill_orphaned_branches.rb

#!/usr/bin/ruby

# delete branches which exist on the origin repo but not locally
 
WHITELIST = [
  "master",
  "production",
  "earth",
  "wind",
  "water",
  "fire",
  "heart",
  "mind"
]
 
branch_status = `git remote show origin`
status_lines = branch_status.split(/\n/).map(&:strip)
 
remote_branches = status_lines.drop_while {|line| line !~ /^Remote branches:/}
remote_branches.shift # also kill "Remote branches:"
remote_branches = remote_branches.take_while {|line| line !~ /^Local branch/}
remote_branches = remote_branches.map {|line| line.split[0]}
 
local_branches = `git branch`.split(/\n/).map {|s| s.sub(/^\*?\s*/, "")}
 
target_branches = remote_branches - local_branches - WHITELIST
 
target_branches.pop # also kill "Local"
 
# to be safe, try this dry-run version first:
# target_branches.each {|branch| puts "git push origin :#{branch}"}
 
target_branches.each {|branch| `git push origin :#{branch}`}