#! /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>
"""
__copyright__ = "Copyright (C) 2006 Hewlett-Packard Development Company, L.P."
__author__    = "Aneesh Kumar K.V <aneesh.kumar@hp.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"

re_ident = re.compile('(author|committer) (?P<ident>.*) (?P<epoch>\d+) (?P<tz>[+-]\d{4})')

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

def show_date(epoch, tz):
        secs = float(epoch)
        tzsecs = float(tz[1:3]) * 3600
        tzsecs += float(tz[3:5]) * 60
        if (tz[0] == "+"):
                secs += tzsecs
        else:
                secs -= tzsecs

        return time.strftime("%Y-%m-%d %H:%M:%S", time.gmtime(secs))


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, [ names ]) 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 = int(max(cols, start, end))

                (column, colour, names) = self.node
                names_len = 0
                if (len(names) != 0):
                        for item in names:
                                names_len += len(item)

                width = box_size * (cols + 1 ) + names_len 
                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, names) = 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)


                if (len(names) != 0):
                        name = " "
                        for item in names:
                                name = name + item + " "

                        ctx.select_font_face("Monospace")
                        ctx.set_font_size(13)
                        ctx.text_path(name)

                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 """

        children_sha1 = {}

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


        def parse_commit(self, commit_lines):

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

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

                # IF we don't have parent
                if (len(self.parent_sha1) == 0):
                        self.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 self.message == "":
                                        self.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_ident.match(line)
                        if (m != None):
                                date = show_date(m.group('epoch'), m.group('tz'))
                                if m.group(1) == "author":
                                        self.author = m.group('ident')
                                        self.date = date
                                elif m.group(1) == "committer":
                                        self.committer = m.group('ident')
                                        self.commit_date = date

                                continue

        def get_message(self, with_diff=0):
                if (with_diff == 1):
                        message = self.diff_tree()
                else:
                        fp = os.popen("git cat-file commit " + self.commit_sha1)
                        message = fp.read()
                        fp.close()

                return message

        def diff_tree(self):
                fp = os.popen("git diff-tree --pretty --cc  -v -p --always " +  self.commit_sha1)
                diff = fp.read()
                fp.close()
                return diff

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 repository 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."""
                vbox = gtk.VBox()
                self.window.add(vbox)
                vbox.show()

                menu_bar = gtk.MenuBar()
                save_menu = gtk.ImageMenuItem(gtk.STOCK_SAVE)
                save_menu.connect("activate", self.save_menu_response, "save")
                save_menu.show()
                menu_bar.append(save_menu)
                vbox.pack_start(menu_bar, False, False, 2)
                menu_bar.show()

                scrollwin = gtk.ScrolledWindow()
                scrollwin.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
                scrollwin.set_shadow_type(gtk.SHADOW_IN)
                vbox.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, encoding):
                """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(unicode(fp.read(), encoding).encode('utf-8'))
                fp.close()
                self.window.show()

        def save_menu_response(self, widget, string):
                dialog = gtk.FileChooserDialog("Save..", None, gtk.FILE_CHOOSER_ACTION_SAVE,
                                (gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL,
                                        gtk.STOCK_SAVE, gtk.RESPONSE_OK))
                dialog.set_default_response(gtk.RESPONSE_OK)
                response = dialog.run()
                if response == gtk.RESPONSE_OK:
                        patch_buffer = self.buffer.get_text(self.buffer.get_start_iter(),
                                        self.buffer.get_end_iter())
                        fp = open(dialog.get_filename(), "w")
                        fp.write(patch_buffer)
                        fp.close()
                dialog.destroy()

class GitView:
        """ This is the main class
        """
        version = "0.7"

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

                self.get_encoding()
                self.get_bt_sha1()

                # 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 get_bt_sha1(self):
                """ Update the bt_sha1 dictionary with the
                respective sha1 details """

                self.bt_sha1 = { }
                ls_remote = re.compile('^(.{40})\trefs/([^^]+)(?:\\^(..))?$');
                fp = os.popen('git ls-remote "${GIT_DIR-.git}"')
                while 1:
                        line = string.strip(fp.readline())
                        if line == '':
                                break
                        m = ls_remote.match(line)
                        if not m:
                                continue
                        (sha1, name) = (m.group(1), m.group(2))
                        if not self.bt_sha1.has_key(sha1):
                                self.bt_sha1[sha1] = []
                        self.bt_sha1[sha1].append(name)
                fp.close()

        def get_encoding(self):
                fp = os.popen("git repo-config --get i18n.commitencoding")
                self.encoding=string.strip(fp.readline())
                fp.close()
                if (self.encoding == ""):
                        self.encoding = "utf-8"


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

                menu_bar = gtk.MenuBar()
                menu_bar.set_pack_direction(gtk.PACK_DIRECTION_RTL)
                help_menu = gtk.MenuItem("Help")
                menu = gtk.Menu()
                about_menu = gtk.MenuItem("About")
                menu.append(about_menu)
                about_menu.connect("activate", self.about_menu_response, "about")
                about_menu.show()
                help_menu.set_submenu(menu)
                help_menu.show()
                menu_bar.append(help_menu)
                vbox.pack_start(menu_bar, False, False, 2)
                menu_bar.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(True)
                column.pack_start(cell, expand=True)
                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 about_menu_response(self, widget, string):
                dialog = gtk.AboutDialog()
                dialog.set_name("Gitview")
                dialog.set_version(GitView.version)
                dialog.set_authors(["Aneesh Kumar K.V <aneesh.kumar@hp.com>"])
                dialog.set_website("http://www.kernel.org/pub/software/scm/git/")
                dialog.set_copyright("Use and distribute under the terms of the GNU General Public License")
                dialog.set_wrap_license(True)
                dialog.run()
                dialog.destroy()


        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 = []

                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 = []

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

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

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

                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(self.with_diff)
                        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(unicode(message, self.encoding).encode('utf-8'))

                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, self.encoding)
                        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 = Commit.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.commits = []

                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 = Commit(commit_lines)
                        if (commit != None ):
                                self.commits.append(commit)

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

                fp.close()

                for commit in self.commits:
                        (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

                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 = -1 

                # Add the incomplete lines of the last cell in this
                try:
                        colour = self.colours[commit.commit_sha1]
                except KeyError:
                        self.colours[commit.commit_sha1] = last_colour+1
                        last_colour = self.colours[commit.commit_sha1] 
                        colour =   self.colours[commit.commit_sha1] 

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

                #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

                for sha1 in self.incomplete_line.keys():
                        if (sha1 != commit.commit_sha1):
                                self.draw_incomplete_line(sha1, node_pos,
                                                out_line, in_line, index)
                        else:
                                del self.incomplete_line[sha1]


                for parent_id in commit.parent_sha1:
                        try:
                                tmp_node_pos = self.nodepos[parent_id]
                        except KeyError:
                                self.colours[parent_id] = last_colour+1
                                last_colour = self.colours[parent_id]
                                self.nodepos[parent_id] = last_nodepos+1
                                last_nodepos = self.nodepos[parent_id] 

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

                try:
                        branch_tag = self.bt_sha1[commit.commit_sha1]
                except KeyError:
                        branch_tag = [ ]


                node = (node_pos, colour, branch_tag)

                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):
                try:
                        self.incomplete_line[sha1].append(self.nodepos[sha1])
                except KeyError:
                        self.incomplete_line[sha1] = [self.nodepos[sha1]]

        def draw_incomplete_line(self, sha1, node_pos, out_line, in_line, index):
                for idx, pos in enumerate(self.incomplete_line[sha1]):
                        if(pos == node_pos):
                                #remove the straight line and add a slash
                                if ((pos, pos, self.colours[sha1]) in out_line):
                                        out_line.remove((pos, pos, self.colours[sha1]))
                                out_line.append((pos, pos+0.5, self.colours[sha1]))
                                self.incomplete_line[sha1][idx] = pos = pos+0.5
                        try:
                                next_commit = self.commits[index+1]
                                if (next_commit.commit_sha1 == sha1 and pos != int(pos)):
                                # join the line back to the node point 
                                # This need to be done only if we modified it
                                        in_line.append((pos, pos-0.5, self.colours[sha1]))
                                        continue;
                        except IndexError:
                                pass
                        in_line.append((pos, pos, self.colours[sha1]))


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

if __name__ == "__main__":
        without_diff = 0

        if (len(sys.argv) > 1 ):
                if (sys.argv[1] == "--without-diff"):
                        without_diff = 1

        view = GitView( without_diff != 1)
        view.run(sys.argv[without_diff:])