#! /usr/bin/env python

# 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 2 of the License, or
# (at your option) any later version.

""" gitview
GUI browser for git repository 
This program is based on bzrk by Scott James Remnant <scott@ubuntu.com>
"""
__author__    = "Aneesh Kumar K.V <aneesh.kumar@gmail.com>"


import sys
import os
import gtk
import pygtk
import pango
import re
import time
import gobject
import cairo
import math
import string

try:
    import gtksourceview
    have_gtksourceview = True
except ImportError:
    have_gtksourceview = False
    print "Running without gtksourceview module"


def list_to_string(args, skip):
	count = len(args)
	i = skip
	str_arg=" "
	while (i < count ):
		str_arg = str_arg + args[i]
		str_arg = str_arg + " "
		i = i+1

	return str_arg


class CellRendererGraph(gtk.GenericCellRenderer):
	"""Cell renderer for directed graph.

	This module contains the implementation of a custom GtkCellRenderer that
	draws part of the directed graph based on the lines suggested by the code
	in graph.py.

	Because we're shiny, we use Cairo to do this, and because we're naughty
	we cheat and draw over the bits of the TreeViewColumn that are supposed to
	just be for the background.

	Properties:
	node              (column, colour) tuple to draw revision node,
	in_lines          (start, end, colour) tuple list to draw inward lines,
	out_lines         (start, end, colour) tuple list to draw outward lines.
	"""

	__gproperties__ = {
	"node":         ( gobject.TYPE_PYOBJECT, "node",
			  "revision node instruction",
			  gobject.PARAM_WRITABLE
			),
	"in-lines":     ( gobject.TYPE_PYOBJECT, "in-lines",
			  "instructions to draw lines into the cell",
			  gobject.PARAM_WRITABLE
			),
	"out-lines":    ( gobject.TYPE_PYOBJECT, "out-lines",
			  "instructions to draw lines out of the cell",
			  gobject.PARAM_WRITABLE
			),
	}

	def do_set_property(self, property, value):
		"""Set properties from GObject properties."""
		if property.name == "node":
			self.node = value
		elif property.name == "in-lines":
			self.in_lines = value
		elif property.name == "out-lines":
			self.out_lines = value
		else:
			raise AttributeError, "no such property: '%s'" % property.name

	def box_size(self, widget):
		"""Calculate box size based on widget's font.

		Cache this as it's probably expensive to get.  It ensures that we
		draw the graph at least as large as the text.
		"""
		try:
			return self._box_size
		except AttributeError:
			pango_ctx = widget.get_pango_context()
			font_desc = widget.get_style().font_desc
			metrics = pango_ctx.get_metrics(font_desc)

			ascent = pango.PIXELS(metrics.get_ascent())
			descent = pango.PIXELS(metrics.get_descent())

			self._box_size = ascent + descent + 6
			return self._box_size

	def set_colour(self, ctx, colour, bg, fg):
		"""Set the context source colour.

		Picks a distinct colour based on an internal wheel; the bg
		parameter provides the value that should be assigned to the 'zero'
		colours and the fg parameter provides the multiplier that should be
		applied to the foreground colours.
		"""
		colours = [
		    ( 1.0, 0.0, 0.0 ),
		    ( 1.0, 1.0, 0.0 ),
		    ( 0.0, 1.0, 0.0 ),
		    ( 0.0, 1.0, 1.0 ),
		    ( 0.0, 0.0, 1.0 ),
		    ( 1.0, 0.0, 1.0 ),
		    ]

		colour %= len(colours)
		red   = (colours[colour][0] * fg) or bg
		green = (colours[colour][1] * fg) or bg
		blue  = (colours[colour][2] * fg) or bg

		ctx.set_source_rgb(red, green, blue)

	def on_get_size(self, widget, cell_area):
		"""Return the size we need for this cell.

		Each cell is drawn individually and is only as wide as it needs
		to be, we let the TreeViewColumn take care of making them all
		line up.
		"""
		box_size = self.box_size(widget)

		cols = self.node[0]
		for start, end, colour in self.in_lines + self.out_lines:
			cols = max(cols, start, end)

		width = box_size * (cols + 1)
		height = box_size

		# FIXME I have no idea how to use cell_area properly
		return (0, 0, width, height)

	def on_render(self, window, widget, bg_area, cell_area, exp_area, flags):
		"""Render an individual cell.

		Draws the cell contents using cairo, taking care to clip what we
		do to within the background area so we don't draw over other cells.
		Note that we're a bit naughty there and should really be drawing
		in the cell_area (or even the exposed area), but we explicitly don't
		want any gutter.

		We try and be a little clever, if the line we need to draw is going
		to cross other columns we actually draw it as in the .---' style
		instead of a pure diagonal ... this reduces confusion by an
		incredible amount.
		"""
		ctx = window.cairo_create()
		ctx.rectangle(bg_area.x, bg_area.y, bg_area.width, bg_area.height)
		ctx.clip()

		box_size = self.box_size(widget)

		ctx.set_line_width(box_size / 8)
		ctx.set_line_cap(cairo.LINE_CAP_SQUARE)

		# Draw lines into the cell
		for start, end, colour in self.in_lines:
			ctx.move_to(cell_area.x + box_size * start + box_size / 2,
					bg_area.y - bg_area.height / 2)

			if start - end > 1:
				ctx.line_to(cell_area.x + box_size * start, bg_area.y)
				ctx.line_to(cell_area.x + box_size * end + box_size, bg_area.y)
			elif start - end < -1:
				ctx.line_to(cell_area.x + box_size * start + box_size,
						bg_area.y)
				ctx.line_to(cell_area.x + box_size * end, bg_area.y)

		    	ctx.line_to(cell_area.x + box_size * end + box_size / 2,
					bg_area.y + bg_area.height / 2)

			self.set_colour(ctx, colour, 0.0, 0.65)
			ctx.stroke()

		# Draw lines out of the cell
		for start, end, colour in self.out_lines:
			ctx.move_to(cell_area.x + box_size * start + box_size / 2,
					bg_area.y + bg_area.height / 2)

			if start - end > 1:
				ctx.line_to(cell_area.x + box_size * start,
						bg_area.y + bg_area.height)
				ctx.line_to(cell_area.x + box_size * end + box_size,
						bg_area.y + bg_area.height)
			elif start - end < -1:
				ctx.line_to(cell_area.x + box_size * start + box_size,
						bg_area.y + bg_area.height)
				ctx.line_to(cell_area.x + box_size * end,
						bg_area.y + bg_area.height)

			ctx.line_to(cell_area.x + box_size * end + box_size / 2,
					bg_area.y + bg_area.height / 2 + bg_area.height)

			self.set_colour(ctx, colour, 0.0, 0.65)
			ctx.stroke()

		# Draw the revision node in the right column
		(column, colour) = self.node
		ctx.arc(cell_area.x + box_size * column + box_size / 2,
				cell_area.y + cell_area.height / 2,
				box_size / 4, 0, 2 * math.pi)

		self.set_colour(ctx, colour, 0.0, 0.5)
		ctx.stroke_preserve()

		self.set_colour(ctx, colour, 0.5, 1.0)
		ctx.fill()

class Commit:
	""" This represent a commit object obtained after parsing the git-rev-list 
	output """

	def __init__(self):
		self.message 		= ""
		self.author		= ""
		self.date 		= ""
		self.committer 		= ""
		self.commit_date 	= ""
		self.commit_sha1	= ""
		self.parent_sha1	= [ ]

	def get_message(self):
		fp = os.popen("git cat-file commit " + self.commit_sha1)
		message = fp.read()
		fp.close()
		return message


class DiffWindow:
	"""Diff window.
	This object represents and manages a single window containing the
	differences between two revisions on a branch.
	"""

	def __init__(self):
		self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
		self.window.set_border_width(0)
		self.window.set_title("Git reposotiry browser diff window")

		# Use two thirds of the screen by default
		screen = self.window.get_screen()
		monitor = screen.get_monitor_geometry(0)
		width = int(monitor.width * 0.66)
		height = int(monitor.height * 0.66)
		self.window.set_default_size(width, height)

		self.construct()

	def construct(self):
		"""Construct the window contents."""
		hbox = gtk.HBox(spacing=6)
		hbox.set_border_width(12)
		self.window.add(hbox)
		hbox.show()

		scrollwin = gtk.ScrolledWindow()
		scrollwin.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
		scrollwin.set_shadow_type(gtk.SHADOW_IN)
		hbox.pack_start(scrollwin, expand=True, fill=True)
		scrollwin.show()

		if have_gtksourceview:
			self.buffer = gtksourceview.SourceBuffer()
			slm = gtksourceview.SourceLanguagesManager()
			gsl = slm.get_language_from_mime_type("text/x-patch")
			self.buffer.set_highlight(True)
			self.buffer.set_language(gsl)
			sourceview = gtksourceview.SourceView(self.buffer)
		else:
			self.buffer = gtk.TextBuffer()
			sourceview = gtk.TextView(self.buffer)

		sourceview.set_editable(False)
		sourceview.modify_font(pango.FontDescription("Monospace"))
		scrollwin.add(sourceview)
		sourceview.show()


	def set_diff(self, commit_sha1, parent_sha1):
		"""Set the differences showed by this window.
		Compares the two trees and populates the window with the
		differences.
		"""
		# Diff with the first commit or the last commit shows nothing
		if (commit_sha1 == 0 or parent_sha1 == 0 ):
			return 

		fp = os.popen("git diff-tree -p " + parent_sha1 + " " + commit_sha1)
		self.buffer.set_text(fp.read())
		fp.close()
		self.window.show()


class GitView:
	""" This is the main class
	"""

	def __init__(self):
        	self.window =  	gtk.Window(gtk.WINDOW_TOPLEVEL)
        	self.window.set_border_width(0)
		self.window.set_title("Git repository browser")


        	# Use three-quarters of the screen by default
        	screen = self.window.get_screen()
        	monitor = screen.get_monitor_geometry(0)
        	width = int(monitor.width * 0.75)
        	height = int(monitor.height * 0.75)
        	self.window.set_default_size(width, height)

        	# FIXME AndyFitz!
        	icon = self.window.render_icon(gtk.STOCK_INDEX, gtk.ICON_SIZE_BUTTON)
        	self.window.set_icon(icon)

        	self.accel_group = gtk.AccelGroup()
        	self.window.add_accel_group(self.accel_group)

        	self.construct()


	def construct(self):
		"""Construct the window contents."""
		paned = gtk.VPaned()
		paned.pack1(self.construct_top(), resize=True, shrink=False)
		paned.pack2(self.construct_bottom(), resize=False, shrink=True)
		self.window.add(paned)
		paned.show()

	def construct_top(self):
		"""Construct the top-half of the window."""
		vbox = gtk.VBox(spacing=6)
		vbox.set_border_width(12)
		vbox.show()

		scrollwin = gtk.ScrolledWindow()
		scrollwin.set_policy(gtk.POLICY_NEVER, gtk.POLICY_AUTOMATIC)
		scrollwin.set_shadow_type(gtk.SHADOW_IN)
		vbox.pack_start(scrollwin, expand=True, fill=True)
		scrollwin.show()

		self.treeview = gtk.TreeView()
		self.treeview.set_rules_hint(True)
		self.treeview.set_search_column(4)
		self.treeview.connect("cursor-changed", self._treeview_cursor_cb)
		scrollwin.add(self.treeview)
		self.treeview.show()

		cell = CellRendererGraph()
		column = gtk.TreeViewColumn()
		column.set_resizable(False)
		column.pack_start(cell, expand=False)
		column.add_attribute(cell, "node", 1)
		column.add_attribute(cell, "in-lines", 2)
		column.add_attribute(cell, "out-lines", 3)
		self.treeview.append_column(column)

		cell = gtk.CellRendererText()
		cell.set_property("width-chars", 65)
		cell.set_property("ellipsize", pango.ELLIPSIZE_END)
		column = gtk.TreeViewColumn("Message")
		column.set_resizable(True)
		column.pack_start(cell, expand=True)
		column.add_attribute(cell, "text", 4)
		self.treeview.append_column(column)

		cell = gtk.CellRendererText()
		cell.set_property("width-chars", 40)
		cell.set_property("ellipsize", pango.ELLIPSIZE_END)
		column = gtk.TreeViewColumn("Author")
		column.set_resizable(True)
		column.pack_start(cell, expand=True)
		column.add_attribute(cell, "text", 5)
		self.treeview.append_column(column)

		cell = gtk.CellRendererText()
		cell.set_property("ellipsize", pango.ELLIPSIZE_END)
		column = gtk.TreeViewColumn("Date")
		column.set_resizable(True)
		column.pack_start(cell, expand=True)
		column.add_attribute(cell, "text", 6)
		self.treeview.append_column(column)

		return vbox


	def construct_bottom(self):
		"""Construct the bottom half of the window."""
		vbox = gtk.VBox(False, spacing=6)
		vbox.set_border_width(12)
		(width, height) = self.window.get_size()
		vbox.set_size_request(width, int(height / 2.5))
		vbox.show()

		self.table = gtk.Table(rows=4, columns=4)
		self.table.set_row_spacings(6)
		self.table.set_col_spacings(6)
		vbox.pack_start(self.table, expand=False, fill=True)
		self.table.show()

		align = gtk.Alignment(0.0, 0.5)
		label = gtk.Label()
		label.set_markup("<b>Revision:</b>")
		align.add(label)
		self.table.attach(align, 0, 1, 0, 1, gtk.FILL, gtk.FILL)
		label.show()
		align.show()

		align = gtk.Alignment(0.0, 0.5)
		self.revid_label = gtk.Label()
		self.revid_label.set_selectable(True)
		align.add(self.revid_label)
		self.table.attach(align, 1, 2, 0, 1, gtk.EXPAND | gtk.FILL, gtk.FILL)
		self.revid_label.show()
		align.show()

		align = gtk.Alignment(0.0, 0.5)
		label = gtk.Label()
		label.set_markup("<b>Committer:</b>")
		align.add(label)
		self.table.attach(align, 0, 1, 1, 2, gtk.FILL, gtk.FILL)
		label.show()
		align.show()

		align = gtk.Alignment(0.0, 0.5)
		self.committer_label = gtk.Label()
		self.committer_label.set_selectable(True)
		align.add(self.committer_label)
		self.table.attach(align, 1, 2, 1, 2, gtk.EXPAND | gtk.FILL, gtk.FILL)
		self.committer_label.show()
		align.show()

		align = gtk.Alignment(0.0, 0.5)
		label = gtk.Label()
		label.set_markup("<b>Timestamp:</b>")
		align.add(label)
		self.table.attach(align, 0, 1, 2, 3, gtk.FILL, gtk.FILL)
		label.show()
		align.show()

		align = gtk.Alignment(0.0, 0.5)
		self.timestamp_label = gtk.Label()
		self.timestamp_label.set_selectable(True)
		align.add(self.timestamp_label)
		self.table.attach(align, 1, 2, 2, 3, gtk.EXPAND | gtk.FILL, gtk.FILL)
		self.timestamp_label.show()
		align.show()

		align = gtk.Alignment(0.0, 0.5)
		label = gtk.Label()
		label.set_markup("<b>Parents:</b>")
		align.add(label)
		self.table.attach(align, 0, 1, 3, 4, gtk.FILL, gtk.FILL)
		label.show()
		align.show()

		self.parents_widgets = []

		scrollwin = gtk.ScrolledWindow()
		scrollwin.set_policy(gtk.POLICY_NEVER, gtk.POLICY_AUTOMATIC)
		scrollwin.set_shadow_type(gtk.SHADOW_IN)
		vbox.pack_start(scrollwin, expand=True, fill=True)
		scrollwin.show()

		self.message_buffer = gtk.TextBuffer()
		textview = gtk.TextView(self.message_buffer)
		textview.set_editable(False)
		textview.set_wrap_mode(gtk.WRAP_WORD)
		textview.modify_font(pango.FontDescription("Monospace"))
		scrollwin.add(textview)
		textview.show()

		align = gtk.Alignment(0.0, 0.5)
		label = gtk.Label()
		label.set_markup("<b>Children:</b>")
		align.add(label)
		self.table.attach(align, 2, 3, 3, 4, gtk.FILL, gtk.FILL)
		label.show()
		align.show()

		self.children_widgets = []

		return vbox

	def _treeview_cursor_cb(self, *args):
		"""Callback for when the treeview cursor changes."""
		(path, col) = self.treeview.get_cursor()
		commit = self.model[path][0]

		if commit.committer is not None:
			committer = commit.committer
			timestamp = commit.commit_date
			message   =  commit.get_message()
			revid_label = commit.commit_sha1
		else:
    			committer = ""
    			timestamp = ""
    			message = ""
			revid_label = ""

		self.revid_label.set_text(revid_label)
		self.committer_label.set_text(committer)
		self.timestamp_label.set_text(timestamp)
		self.message_buffer.set_text(message)

		for widget in self.parents_widgets:
			self.table.remove(widget)

		self.parents_widgets = []
		self.table.resize(4 + len(commit.parent_sha1) - 1, 4)
		for idx, parent_id in enumerate(commit.parent_sha1):
			self.table.set_row_spacing(idx + 3, 0)

			align = gtk.Alignment(0.0, 0.0)
			self.parents_widgets.append(align)
			self.table.attach(align, 1, 2, idx + 3, idx + 4,
					gtk.EXPAND | gtk.FILL, gtk.FILL)
			align.show()

			hbox = gtk.HBox(False, 0)
			align.add(hbox)
			hbox.show()

			label = gtk.Label(parent_id)
			label.set_selectable(True)
			hbox.pack_start(label, expand=False, fill=True)
			label.show()

			image = gtk.Image()
			image.set_from_stock(gtk.STOCK_JUMP_TO, gtk.ICON_SIZE_MENU)
			image.show()

			button = gtk.Button()
			button.add(image)
			button.set_relief(gtk.RELIEF_NONE)
			button.connect("clicked", self._go_clicked_cb, parent_id)
			hbox.pack_start(button, expand=False, fill=True)
			button.show()

			image = gtk.Image()
			image.set_from_stock(gtk.STOCK_FIND, gtk.ICON_SIZE_MENU)
			image.show()

			button = gtk.Button()
			button.add(image)
			button.set_relief(gtk.RELIEF_NONE)
			button.set_sensitive(True)
			button.connect("clicked", self._show_clicked_cb,
					commit.commit_sha1, parent_id)
			hbox.pack_start(button, expand=False, fill=True)
			button.show()

		# Populate with child details
		for widget in self.children_widgets:
			self.table.remove(widget)

		self.children_widgets = []
		try:
			child_sha1 = self.children_sha1[commit.commit_sha1]
		except KeyError:
			# We don't have child
			child_sha1 = [ 0 ]

		if ( len(child_sha1) > len(commit.parent_sha1)):
			self.table.resize(4 + len(child_sha1) - 1, 4)

		for idx, child_id in enumerate(child_sha1):
			self.table.set_row_spacing(idx + 3, 0)

			align = gtk.Alignment(0.0, 0.0)
			self.children_widgets.append(align)
			self.table.attach(align, 3, 4, idx + 3, idx + 4,
					gtk.EXPAND | gtk.FILL, gtk.FILL)
			align.show()

			hbox = gtk.HBox(False, 0)
			align.add(hbox)
			hbox.show()

			label = gtk.Label(child_id)
			label.set_selectable(True)
			hbox.pack_start(label, expand=False, fill=True)
			label.show()

			image = gtk.Image()
			image.set_from_stock(gtk.STOCK_JUMP_TO, gtk.ICON_SIZE_MENU)
			image.show()

			button = gtk.Button()
			button.add(image)
			button.set_relief(gtk.RELIEF_NONE)
			button.connect("clicked", self._go_clicked_cb, child_id)
			hbox.pack_start(button, expand=False, fill=True)
			button.show()

			image = gtk.Image()
			image.set_from_stock(gtk.STOCK_FIND, gtk.ICON_SIZE_MENU)
			image.show()

			button = gtk.Button()
			button.add(image)
			button.set_relief(gtk.RELIEF_NONE)
			button.set_sensitive(True)
			button.connect("clicked", self._show_clicked_cb,
					child_id, commit.commit_sha1)
			hbox.pack_start(button, expand=False, fill=True)
			button.show()

	def _destroy_cb(self, widget):
		"""Callback for when a window we manage is destroyed."""
		self.quit()


	def quit(self):
		"""Stop the GTK+ main loop."""
		gtk.main_quit()

	def run(self, args):
		self.set_branch(args)
        	self.window.connect("destroy", self._destroy_cb)
		self.window.show()
		gtk.main()

	def set_branch(self, args):
		"""Fill in different windows with info from the reposiroty"""
		fp = os.popen("git rev-parse --sq --default HEAD " + list_to_string(args, 1))
		git_rev_list_cmd = fp.read()
		fp.close()
		fp = os.popen("git rev-list  --header --topo-order --parents " + git_rev_list_cmd)
		self.update_window(fp)

	def update_window(self, fp):
		commit_lines = []

		self.model = gtk.ListStore(gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT,
				gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT, str, str, str)

		# used for cursor positioning 
		self.index = {}

		self.colours = {}
		self.nodepos = {}
		self.incomplete_line = {}
		self.children_sha1 = {}

		index = 0
		last_colour = 0
		last_nodepos = -1
		out_line = []	
		input_line = fp.readline()
		while (input_line != ""):
			# The commit header ends with '\0'
			# This NULL is immediately followed by the sha1 of the 
			# next commit
			if (input_line[0] != '\0'):
				commit_lines.append(input_line)
				input_line = fp.readline()
				continue;

			commit = self.parse_commit(commit_lines);
			if (commit != None ):
				(out_line, last_colour, last_nodepos) = self.draw_graph(commit,
										index, out_line,
										last_colour,
										last_nodepos)
				self.index[commit.commit_sha1] = index
				index += 1

			# Skip the '\0
			commit_lines = []
			commit_lines.append(input_line[1:])
			input_line = fp.readline()

		fp.close()

		self.treeview.set_model(self.model)
		self.treeview.show()

	def draw_graph(self, commit, index, out_line, last_colour, last_nodepos):
		in_line=[]

		#   |   -> outline
		#   X
		#   |\  <- inline 

		# Reset nodepostion
		if (last_nodepos > 5):
			last_nodepos = 0

		# Add the incomplete lines of the last cell in this 
		for sha1 in self.incomplete_line.keys():
			if ( sha1 != commit.commit_sha1):
				for pos in self.incomplete_line[sha1]:
					in_line.append((pos, pos, self.colours[sha1]))
			else:
				del self.incomplete_line[sha1]

		try:
			colour = self.colours[commit.commit_sha1]
		except KeyError:
			last_colour +=1
			self.colours[commit.commit_sha1] = last_colour
			colour =  last_colour
		try:
			node_pos = self.nodepos[commit.commit_sha1]
		except KeyError:
			last_nodepos +=1
			self.nodepos[commit.commit_sha1] = last_nodepos
			node_pos = last_nodepos

		#The first parent always continue on the same line
		try:
			# check we alreay have the value
			tmp_node_pos = self.nodepos[commit.parent_sha1[0]]
		except KeyError:
			self.colours[commit.parent_sha1[0]] = colour
			self.nodepos[commit.parent_sha1[0]] = node_pos

		in_line.append((node_pos, self.nodepos[commit.parent_sha1[0]],
					self.colours[commit.parent_sha1[0]]))

		self.add_incomplete_line(commit.parent_sha1[0], index+1)

		if (len(commit.parent_sha1) > 1):
			for parent_id in commit.parent_sha1[1:]:
				try:
					tmp_node_pos = self.nodepos[parent_id]
				except KeyError:
					last_colour += 1;
					self.colours[parent_id] = last_colour
					last_nodepos +=1
					self.nodepos[parent_id] = last_nodepos

				in_line.append((node_pos, self.nodepos[parent_id],
							self.colours[parent_id]))
				self.add_incomplete_line(parent_id, index+1)

		node = (node_pos, colour) 

		self.model.append([commit, node, out_line, in_line,
				commit.message, commit.author, commit.date]) 

		return (in_line, last_colour, last_nodepos)

	def add_incomplete_line(self, sha1, index):
		try:
			self.incomplete_line[sha1].append(self.nodepos[sha1])
		except KeyError:
			self.incomplete_line[sha1] = [self.nodepos[sha1]]


	def parse_commit(self, commit_lines):

		commit = Commit()

		# First line is the sha1 lines
		line = string.strip(commit_lines[0])
		sha1 = re.split(" ", line)
		commit.commit_sha1 = sha1[0]
		commit.parent_sha1 = sha1[1:]

		#build the child list
		for parent_id in commit.parent_sha1:
			try:
				self.children_sha1[parent_id].append(commit.commit_sha1)
			except KeyError:
				self.children_sha1[parent_id] = [commit.commit_sha1]

		# IF we don't have parent
		if (len(commit.parent_sha1) == 0):
			commit.parent_sha1 = [0]

		for line in commit_lines[1:]:
			m = re.match("^ ", line)
			if (m != None):
				# First line of the commit message used for short log
				if commit.message == "":
					commit.message = string.strip(line)
				continue

			m = re.match("tree", line)
			if (m != None):
				continue

			m = re.match("parent", line)
			if (m != None):
				continue


			m = re.match("author", line)
			if (m  != None ):
				patch_author = re.split(" ", line)	
				commit.author = list_to_string(patch_author[1:-2], 0)
				commit.date = time.strftime("%Y-%m-%d %H:%M:%S",
						time.gmtime(float(patch_author[-2])))
				continue

			m = re.match("committer", line)
			if (m  != None ):
				patch_committer = re.split(" ", line)	
				commit.committer = list_to_string(patch_committer[1:-2], 0)
				commit.commit_date = time.strftime("%Y-%m-%d %H:%M:%S",
						time.gmtime(float(patch_committer[-2])))
				continue

		return commit


	def _go_clicked_cb(self, widget, revid):
		"""Callback for when the go button for a parent is clicked."""
		try:
			self.treeview.set_cursor(self.index[revid])
		except KeyError:
			print "Revision %s not present in the list" % revid
			# revid == 0 is the parent of the first commit
			if (revid != 0 ):
				print "Try running gitview without any options"

		self.treeview.grab_focus()

	def _show_clicked_cb(self, widget,  commit_sha1, parent_sha1):
		"""Callback for when the show button for a parent is clicked."""
		window = DiffWindow()
		window.set_diff(commit_sha1, parent_sha1)
		self.treeview.grab_focus()

if __name__ == "__main__":
	view = GitView()
	view.run(sys.argv)