#!/usr/bin/env ruby

##############################
# Create local tracking branches for all remote branches
# that don't have local branches with a matching name.
#
# TODO: Add remote name as an agument
# TODO: Add option for pass-through grep arguments to filter branches
##############################

# TODO: Accept this as an argument
REMOTE = 'origin'

# Filter only branches not already existing locally
local_branches = %x(git branch | sed 's/^*/ /' | sort).split
remote_branches = %x(git branch -r | sed 's&#{REMOTE}/&&' | sort).split
untracked_branches = remote_branches - local_branches

# Create a tracking branch for each untracked branch
untracked_branches.each { |branch|
  remote_branch = "#{REMOTE}/#{branch}"
  puts "Creating a tracking branch for #{branch}:#{remote_branch}"
  %x(git branch --track #{branch} #{remote_branch})
}