class Utils::Editor

def activate
  if Array(config.vim_default_args).include?('-g')
    edit_remote("stupid_trick#{rand}")
    sleep pause_duration
    edit_remote_send('<ESC>:bw<CR>')
  else
    switch_to_index =
      `tmux list-panes -F '\#{pane_pid} \#{pane_index}'`.lines.find { |l|
        pid, index = l.split(' ')
        pid.to_i == $$ and next
        if `ps -eo ppid,command|grep ^#{pid}` =~ %r(/edit( |$))
          break index.to_i
        end
      }
    switch_to_index and system "tmux select-pane -t #{switch_to_index}"
  end
end

def cmd(*parts)
  command = parts.compact.inject([]) do |a, p|
    case
    when p == nil, p == []
      a
    when p.respond_to?(:to_ary)
      a.concat p.to_ary
    else
      a << p.to_s
    end
  end
  $DEBUG and warn command * ' '
  system(*command.map(&:to_s))
end

def derive_server_name
  name = ENV['VIM_SERVER'] || Dir.pwd
  RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ and name = "G_#{name}"
  name.upcase
end

def edit(*filenames)
  if filenames.size == 1 and
    source_location = filenames.first.source_location
  then
    edit_source_location(source_location) # || edit_file(expand_globs(source_location[0, 1]))
  elsif source_locations = filenames.map(&:source_location).compact.full?
    filenames = expand_globs(source_locations.map(&:first))
    edit_file(*filenames)
  end.tap do
    activate
  end
end

def edit_file(*filenames)
  make_dirs(*filenames)
  edit_remote_file(*filenames)
end

def edit_file_linenumber(filename, linenumber)
  make_dirs filename
  if wait?
    edit_remote_wait("+#{linenumber}", filename)
  else
    edit_remote("+#{linenumber}", filename)
  end
end

def edit_remote(*args)
  cmd(*vim, '--servername', servername, '--remote', *args)
end

def edit_remote_file(*filenames)
  if wait?
    edit_remote_wait(*filenames)
  else
    edit_remote(*filenames)
  end
end

def edit_remote_send(*args)
  cmd(*vim, '--servername', servername, '--remote-send', *args)
end

def edit_remote_wait(*args)
  cmd(*vim, '--servername', servername, '--remote-wait', *args)
end

def edit_source_location(source_location)
  edit_file_linenumber(source_location[0], source_location[1])
end

def expand_globs(filenames)
  filenames.map { |f| Dir[f] }.flatten.uniq.sort.full? || filenames
end

def file_linenumber?(filename)
  filename.match(FILE_LINENUMBER_REGEXP)
end

def fullscreen=(enabled)
  start
  sleep pause_duration
  if enabled
    edit_remote_send '<ESC>:set fullscreen<CR>'
  else
    edit_remote_send '<ESC>:set nofullscreen<CR>'
  end
  activate
end

def initialize
  self.wait           = false
  self.pause_duration = 1
  self.servername     = derive_server_name
  config              = Utils::Config::ConfigFile.new
  config.configure_from_paths
  self.config = config.edit
  yield self if block_given?
end

def make_dirs(*filenames)
  if mkdir
    for filename in filenames
      FileUtils.mkdir_p File.dirname(filename)
    end
  end
end

def serverlist
  @serverlist ||= `#{vim.map(&:inspect) * ' '} --serverlist`.split
end

def start
  started? or cmd(*vim, '--servername', servername)
end

def started?(name = servername)
  serverlist.member?(name)
end

def stop
  started? and edit_remote_send('<ESC>:qa<CR>')
end

def vim
  ([ config.vim_path ] + Array(config.vim_default_args))
end