#!/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

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 'This repository contains hooks installed by Overcommit, but the ' \
       "overcommit gem is not installed.\n" \
       'Install it with `gem install overcommit`.'
  exit
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.new(logger).load_repo_config

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

  printer = Overcommit::Printer.new(logger, context)
  runner = Overcommit::HookRunner.new(config, logger, context, 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 Overcommit::Exceptions::InvalidHookSignature
  exit 1
rescue => error
  puts error.message
  puts error.backtrace
  puts "Report this bug at #{Overcommit::BUG_REPORT_URL}"
  exit 70 # EX_SOFTWARE
end