# encoding: utf-8
#
# Copyright (C) 2009 by RegEchse <RegEchse@gmx.de>
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
#
# Provides a (title bar) item with word wrapped buffer title
# 
# History:
# 2009-12-06, RegEchse <RegEchse@gmx.de>
#     version 0.1: first public release
#
# KNOWN ISSUE:
#   Word wrapping breaks up color display in irc topics.
#   Due to this problem colors are currently removed before wrapping.
#   (Maybe support for topic color could be added if anybody wants it.)

VERSION = "0.1"
ITEM_NAME = "buffer_title_word_wrapped"

W = Weechat

def weechat_init
  W.register("title_wrapper", "RegEchse", VERSION, "GPL3", 
             "does (better) word wrapping for multilined title bar", "", "")
  W.bar_item_new(ITEM_NAME, "build_callback", "")
  W.hook_signal("buffer_title_changed", "update_title", "")
  W.hook_command("title_wrapper",
                 "shows some useful information (usage of bar item)",
                 "", "", "", "usage", "")
  return W::WEECHAT_RC_OK
end

def usage(data, buffer, args)
  W.print("", <<HELP)

Title bar word wrapper:
 This script provides a (title) bar item that expands to the title of buffer
  with lines wrapped to the current window width. Words that are too long will
  simply be split up after <window width> characters.
 To use the bar item /set weechat.bar.title.items "#{ITEM_NAME}"
  and /set weechat.bar.title.filling_top_bottom vertical
 Note:
  weechat.bar.title.size defaults to 1 which has to be set to either
    - a value > 1 to have a fixed line size for title bar or
    - 0 for auto resized title bar.
   If you use the latter one you might also consider 
   setting weechat.bar.title.size_max.

HELP
end

def update_title(data, signal, signal_data)
  W.bar_item_update(ITEM_NAME)
  return W::WEECHAT_RC_OK
end

def build_callback(data, item, window)
  buf   = W.window_get_pointer(window, "buffer")
  text  = W.buffer_get_string(buf, "title")
  width = W.window_get_integer(window, "win_width")
  
  if(W.buffer_get_string(buf, "plugin") == "irc")
    text = W.hook_modifier_exec("irc_color_decode", "0", text)
  end
  all = ""
  while( tmp = text.slice!(0, width) )
    i = tmp.rindex(" ")

    if(text.empty?)
      all << tmp
      break
    elsif(i == width ||
       (text[0,1] == " " && text = text[1..-1]) ||
       i.nil? ||
       tmp[0...i].rstrip.empty?)

      all << tmp << "\n"
    else
      all << tmp[0...i] << "\n"
      text = tmp[(i+1)..-1] + text
    end

  end

  return all.chomp
end