#!/usr/bin/ruby
# -*- coding: utf-8 -*-

HOMEBREW_BREW_FILE = ENV['HOMEBREW_BREW_FILE'] = File.expand_path(__FILE__)

require 'pathname'
HOMEBREW_LIBRARY_PATH = Pathname.new(__FILE__).realpath.dirname.parent.join("Library/Homebrew").to_s
$:.unshift(HOMEBREW_LIBRARY_PATH)
require 'global'

case ARGV.first when '-h', '--help', '--usage', '-?', 'help', nil
  require 'cmd/help'
  puts Homebrew.help_s
  exit ARGV.first ? 0 : 1
when '--version'
  puts HOMEBREW_VERSION
  exit 0
when '-v'
  if ARGV.length > 1
    puts "Homebrew #{HOMEBREW_VERSION}"
    # continue in verbose mode
    ARGV << ARGV.shift
  else
    puts HOMEBREW_VERSION
    exit 0
  end
end

if Process.uid.zero? and not File.stat(HOMEBREW_BREW_FILE).uid.zero?
  # note we only abort if Homebrew is *not* uninstalled sudo and the user
  # calls brew as root. The fix is to chown brew to root.
  abort "Cowardly refusing to `sudo brew'"
end
case HOMEBREW_PREFIX.to_s when '/', '/usr'
  # it may work, but I only see pain this route and don't want to support it
  abort "Cowardly refusing to continue at this prefix: #{HOMEBREW_PREFIX}"
end
if MACOS_VERSION < 10.5
  abort <<-EOABORT.undent
    Homebrew requires Leopard or higher. For Tiger support, see:
    http://github.com/sceaga/homebrew/tree/tiger
  EOABORT
end

# Many Pathname operations use getwd when they shouldn't, and then throw
# odd exceptions. Reduce our support burden by showing a user-friendly error.
Dir.getwd rescue abort "The current working directory doesn't exist, cannot proceed."


def require? path
  require path.to_s.chomp
rescue LoadError => e
  # HACK :( because we should raise on syntax errors but
  # not if the file doesn't exist. TODO make robust!
  raise unless e.to_s.include? path
end

begin
  aliases = {'ls' => :list,
             'homepage' => :home,
             '-S' => :search,
             'up' => :update,
             'ln' => :link,
             'instal' => :install, # gem does the same
             'rm' => :uninstall,
             'remove' => :uninstall,
             'configure' => :diy,
             'abv' => :info,
             'dr' => :doctor,
             '--repo' => '--repository',
             'environment' => '--env'  # same as gem
             }

  cmd = ARGV.shift
  cmd = aliases[cmd] if aliases[cmd]

  # Add example external commands to PATH before checking.
  ENV['PATH'] += ":#{HOMEBREW_REPOSITORY}/Library/Contributions/examples"
  if system "/usr/bin/which -s brew-#{cmd}"
    %w[CACHE CELLAR LIBRARY_PATH PREFIX REPOSITORY].each do |e|
      ENV["HOMEBREW_#{e}"] = Object.const_get "HOMEBREW_#{e}"
    end
    exec "brew-#{cmd}", *ARGV
  elsif require? `/usr/bin/which brew-#{cmd}.rb`
    exit 0
  elsif require? HOMEBREW_REPOSITORY/"Library/Homebrew/cmd"/cmd
    Homebrew.send cmd.to_s.gsub('-', '_')
  else
    # Check for git commands
    if %w[branch checkout pull push rebase reset].include? cmd
      onoe "Unknown command: #{cmd} (did you mean `git #{cmd}'?)"
    else
      onoe "Unknown command: #{cmd}"
    end
  end

rescue FormulaUnspecifiedError
  abort "This command requires a formula argument"
rescue KegUnspecifiedError
  abort "This command requires a keg argument"
rescue UsageError
  onoe "Invalid usage"
  abort ARGV.usage
rescue SystemExit
  puts "Kernel.exit" if ARGV.verbose?
  raise
rescue Interrupt => e
  puts # seemingly a newline is typical
  exit 130
rescue BuildError => e
  require 'cmd/--config'
  require 'cmd/--env'

  e.backtrace[1] =~ %r{Library/Formula/(.+)\.rb:(\d+)}
  formula_name = $1
  error_line = $2

  ohai "Exit Status: #{e.exit_status}"
  puts "http://github.com/mxcl/homebrew/blob/master/Library/Formula/#{formula_name}.rb#L#{error_line}"
  ohai "Environment"
  puts Homebrew.config_s
  ohai "Build Flags"
  Homebrew.dump_build_env e.env
  puts
  onoe e
  puts PLEASE_REPORT_BUG
  # this feature can be slow (depends on network conditions and if github is up)
  # so ideally we'd show feedback, eg. "checking for existing issues..." and
  # then replace that string with the following when the github api returns
  issues = GitHub.issues_for_formula formula_name
  puts "These existing issues may help you:", *issues unless issues.empty?
  if e.was_running_configure?
    puts "It looks like an autotools configure failed."
    puts "Consider re-running the install with '-vd' to keep 'config.log' around:"
    puts "    brew install -vd #{formula_name}"
    puts "Gist 'config.log' and any error output when reporting an issue."
    puts "Remember to include your config information: brew --config"
  end
  puts
  puts "Also try:"
  puts "  `brew doctor` to check your setup for common problems."
  puts "  `brew missing` to check installed packages for missing deps."
  exit 1
rescue RuntimeError, SystemCallError => e
  onoe e
  puts e.backtrace if ARGV.debug?
  exit 1
rescue Exception => e
  onoe e
  puts PLEASE_REPORT_BUG
  puts e.backtrace
  exit 1
end