# -*- coding: utf8 -*-

#
# reformats the selection to fit to the right margin, based
# on uwog's more featureful C plugin
#

import gedit
import gtk


class ParPlugin(gedit.Plugin):
	def __init__(self):
		gedit.Plugin.__init__(self)

	def reformat_selection(self, window):
		view = window.get_active_view()
		if not view:
			 return

		right_margin = view.get_property("margin")

		doc = view.get_buffer()

		if not doc.get_selection_bounds():
			return

		ins = doc.get_insert()
		sel = doc.get_selection_bound()

		s = doc.get_iter_at_mark(ins)
		e = doc.get_iter_at_mark(sel)

		if s.compare(e) < 0:
			end = sel
		else:
			s = e
			end = ins

		doc.begin_user_action()

		s.set_line_offset(0)
		while s.compare(doc.get_iter_at_mark(end)) < 0:
			chars = s.get_chars_in_line()

			if chars == 0:
				# empty line, skip
				s.forward_line()

			elif chars > right_margin:
				s.set_line_offset(right_margin)
				s.backward_word_start()
				if s.starts_line():
					# ouch... no word breaks in the line, skip for now
					s.forward_line()
				else:
					# todo: strip whitespaces
					doc.insert(s, "\n")

			elif chars < right_margin:
				if s.forward_to_line_end():
					tmp = s.copy()
					s.backward_word_start()
					s.forward_word_end()
					if not tmp.forward_word_end():
						break  # we hit the end iter
					tmp.backward_word_start()

					# two empty lines mean end of paragraph
					if s.get_line() - s.get_line() > 2:
						s.forward_line()
						continue

					doc.delete(s, tmp)
					doc.insert(s, " ")
					s.set_line_offset(0) # re evaluate the line

			else:
				s.forward_line()

		doc.end_user_action()

	def activate(self, window):
		action = ("Par",
			  None,
			  "Format Paragraph",
			  "<Control>J",
			  "Reformat selection to fit the right margin",
			  lambda x, y: self.reformat_selection(y))

		# store per window data in the window object
		windowdata = dict()
		window.set_data("ParPluginWindowDataKey", windowdata)

		windowdata["action_group"] = gtk.ActionGroup("GeditParPluginActions")
		#windowdata["action_group"].set_translation_domain(GETTEXT_PACKAGE)
		windowdata["action_group"].add_actions ([action], window)

		manager = window.get_ui_manager()
		manager.insert_action_group(windowdata["action_group"], -1)

		windowdata["ui_id"] = manager.new_merge_id ()

		manager.add_ui (windowdata["ui_id"],
				"/MenuBar/EditMenu/EditOps_4",
				"Par",
				"Par",
				gtk.UI_MANAGER_MENUITEM, 
				True)

	def deactivate(self, window):
		windowdata = window.get_data("ParPluginWindowDataKey")
		manager = window.get_ui_manager()
		manager.remove_action_ui(windowdata["ui_id"])
		manager.remove_action_group(windowdata["action_group"])

	def update_ui(self, window):
		view = window.get_active_view()
		windowdata = window.get_data("ParPluginWindowDataKey")
		windowdata["action_group"].set_sensitive(bool(view and view.get_editable()))