#!/usr/bin/env ruby

require "optparse"
require_relative "./helpers/submodule"

usage = <<-EOH
Usage:
  #{$0} [-t|--test] [-h|--help]

Examples:
  #{$0}         # Update .gitmodules file in-place
  #{$0} --help  # Display this help message
  #{$0} --test  # Exit with an error code if .gitmodules needs sorting
EOH

$testing = false

OptionParser.new do |opts|
  opts.banner = usage
  opts.on("-h", "--help") do
    puts usage
    exit
  end
  opts.on("-t", "--test", "Don't update file; only test if it's unsorted") do
    $testing = true
  end
end.parse!

unsorted = read ".gitmodules"
sorted = Submodule.list.join

if $testing
  exit unsorted == sorted
else
  write ".gitmodules", sorted
end