#!/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.

# Prevent a Ruby stack trace from appearing when we interrupt the hook.
# Note that this will be overridden when Overcommit is loaded, since the
# InterruptHandler will redefine the trap at that time.
Signal.trap('INT') do
  puts 'Hook run interrupted'
  exit 130
end

# Allow hooks to be disabled via environment variable so git commands can be run
# in scripts without Overcommit running hooks
if ENV['OVERCOMMIT_DISABLE'].to_i != 0 || ENV['OVERCOMMIT_DISABLED'].to_i != 0
  exit
end

# Required for Ruby 1.8 compatibility (for older OSX versions)
if RUBY_VERSION.split('.')[0..1] == %w[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')
    puts 'Installing...'
    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 -- try running `gem install overcommit`'
      exit 69 # EX_UNAVAILABLE
    end
  else
    puts 'You chose not to install Overcommit'
    puts "No hooks were run for '#{hook_type}'"
    exit
  end
end

if Gem::Version.new(Overcommit::VERSION) < Gem::Version.new('0.6.0')
  puts "Installed version of Overcommit (#{Overcommit::VERSION}) is " \
       "incompatible with the installed hooks.\n" \
       'Run `gem install overcommit && overcommit --install` to ensure ' \
       "you're up-to-date."
  exit 64 # EX_USAGE
end

begin
  logger = Overcommit::Logger.new(STDOUT)

  # Ensure master hook is up-to-date
  installer = Overcommit::Installer.new(logger)
  if installer.run(Overcommit::Utils.repo_root, :action => :update)
    exec($0, *ARGV) # Execute the updated hook with all original arguments
  end

  config = Overcommit::ConfigurationLoader.load_repo_config

  context = Overcommit::HookContext.create(hook_type, config, ARGV, STDIN)
  config.apply_environment!(context, ENV)

  input = Overcommit::UserInput.new(STDIN)

  printer = Overcommit::Printer.new(logger, context)
  runner = Overcommit::HookRunner.new(config, logger, context, input, printer)

  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::HookSetupFailed,
       Overcommit::Exceptions::HookCleanupFailed => error
  puts error.message
  exit 74 # EX_IOERR
rescue Overcommit::Exceptions::HookCancelled
  puts 'You cancelled the hook run'
  exit 130 # Ctrl-C cancel
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