Git Branch Switcher

switch.sh

#!/usr/bin/env ruby
require 'highline'

# Creates a numbered menu of your most recently committed branches to quickly jump between them

# Prerequisites: 
# 1) ruby
# 2) gem install highline

LIMIT = 6

def main

    branches = `git branch --sort=-committerdate`.split("\n").map do |line|
        line.gsub(/[* ]/,'')
    end

    if !is_clean
        # list them but can't switch to any
        puts "Working Directory is not clean."
        return puts (branches.map {|branch| " - " + branch + "\n"}).join
    end

    # always include master in the list
    branches.push('master') if !branches.include? 'master'

    # make a menu
    cli = HighLine.new
    cli.choose do |menu|
        menu.prompt = "Pick a branch to switch to:  "
        menu.choice('Nothing, nevermind...') {|result| return }
        branches.each_with_index do |branch, i|
            next if i > LIMIT
            menu.choice(branch) {|result| checkout result}
        end
    end
end

def is_clean
    `git status`.include? 'nothing to commit, working tree clean'
end

def checkout(branch)
    `git checkout #{branch}`
end

main