#!/usr/bin/env ruby

require 'git'
require 'logger'

g = Git.open(Dir.pwd)

if ARGV.include?("-h") || ARGV.include?("--help")
  puts <<-EOF
USAGE: git bump [options]

-h              Print out help
-v              Verbose output
--major         Bump major version
--minor         Bump minor version
--dry           Don't create a new tag, just show what it would be
  EOF
  exit(0)
end

verbose = ARGV.include?("-v") || ARGV.include?("--verbose")
separator = ARGV.include?("--google") || ARGV.include?("-g") || g.config("core.gaeversion").eql?("true") ? "-" : "."

current_version = `git describe`.strip

@major, @minor, @patch = current_version.split(/[\.-]/)

@major ||= 0; @minor ||= 0; @patch ||= 0

if ARGV.include?("--major");
  @major = @major.to_i.next; @minor = 0; @patch = 0
elsif ARGV.include?("--minor")
  @minor = @minor.to_i.next; @patch = 0
else
  @patch = @patch.to_i.next
end

new_version = [@major, @minor, @patch].join(separator)
puts "CURRENT VERSION: #{current_version}" if verbose
puts "NEW VERSION: #{new_version}"

unless ARGV.include?("--dry")
  _command = "git tag -m '#{new_version}' #{new_version}"
  puts "--> #{_command}" if verbose
  system(_command)

  _command = "git push --tags"
  puts "--> #{_command}" if verbose
  system(_command)
end