overcommit-hook

#!/usr/bin/env ruby

# Entrypoint for Overcommit hook integration. Installing Overcommit will result
# in all of your git hooks being symlinked to this file, allowing the framework
# to manage your hooks for you.

# Required for Ruby 1.8 compatibility (for older OSX versions)
if RUBY_VERSION.split('.')[0..1] == ['1', '8']
  require 'rubygems'
end

hook_type = File.basename($0)
if hook_type == 'overcommit-hook'
  puts "Don't run `overcommit-hook` directly; it is intended to be symlinked " <<
       "by each hook in a repository's .git/hooks directory."
  exit 64 # EX_USAGE
end

begin
  require 'overcommit'
rescue LoadError
  puts 'Overcommit is not installed. Install it to manage git hooks for ' <<
       'this repository? (y/n)'

  # If the hook isn't interactive, we need to map STDIN to keyboard manually
  STDIN.reopen('/dev/tty') if STDIN.eof?

  if (answer = gets) && answer.strip.downcase.start_with?('y')
    if system('gem install overcommit')
      Gem.clear_paths # Reset load paths so newly installed gem is found
      require 'overcommit'
    else
      puts 'Unable to install Overcommit'
      exit
    end
  else
    puts 'You chose not to install Overcommit'
    puts "No hooks were run for '#{hook_type}'"
    exit
  end
end

begin
  hook_type_class = Overcommit::Utils.camel_case(hook_type)

  config = Overcommit::ConfigurationLoader.load_repo_config
  config.apply_environment!(hook_type_class, ENV)

  # Ensure this script and all symlinks are always up-to-date (it's cheap to do)
  Overcommit::Installer.new(Overcommit::Logger.silent).
                        run(Overcommit::Utils.repo_root, :action => :install)

  context = Overcommit::HookContext.create(hook_type_class, config, ARGV, STDIN)
  logger = Overcommit::Logger.new(STDOUT)
  runner = Overcommit::HookRunner.new(config, logger, context)

  status = runner.run

  exit(status ? 0 : 65) # 65 = EX_DATAERR
rescue Overcommit::Exceptions::ConfigurationError => error
  puts error
  exit 78 # EX_CONFIG
rescue Overcommit::Exceptions::HookContextLoadError => error
  puts error
  puts 'Are you running an old version of Overcommit?'
  exit 69 # EX_UNAVAILABLE
rescue Overcommit::Exceptions::InvalidGitRepo => error
  puts error
  exit 64 # EX_USAGE
rescue => error
  puts error.message
  puts error.backtrace
  puts "Report this bug at #{Overcommit::BUG_REPORT_URL}"
  exit 70 # EX_SOFTWARE
end