/b-gtk/fix-viz

# -*- coding: UTF-8 -*-

"""Difference window.

This module contains the code to manage the diff window which shows

the changes made between two revisions on a branch.

"""

__copyright__ = "Copyright © 2005 Canonical Ltd."

__author__    = "Scott James Remnant <scott@ubuntu.com>"

from cStringIO import StringIO

import pygtk

pygtk.require("2.0")

import gtk

import pango

import os

import re

import sys

try:

    import gtksourceview

    have_gtksourceview = True

except ImportError:

    have_gtksourceview = False

try:

    import gconf

    have_gconf = True

except ImportError:

    have_gconf = False

from bzrlib import osutils

from bzrlib.diff import show_diff_trees, internal_diff

from bzrlib.errors import NoSuchFile

from bzrlib.trace import warning

from bzrlib.plugins.gtk.window import Window

class DiffView(gtk.ScrolledWindow):

    """This is the soft and chewy filling for a DiffWindow."""

    def __init__(self):

        gtk.ScrolledWindow.__init__(self)

        self.construct()

        self.rev_tree = None

        self.parent_tree = None

    def construct(self):

        self.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)

        self.set_shadow_type(gtk.SHADOW_IN)

        if have_gtksourceview:

            self.buffer = gtksourceview.SourceBuffer()

            slm = gtksourceview.SourceLanguagesManager()

            gsl = slm.get_language_from_mime_type("text/x-patch")

            if have_gconf:

                self.apply_gedit_colors(gsl)

            self.apply_colordiff_colors(gsl)

            self.buffer.set_language(gsl)

            self.buffer.set_highlight(True)

            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"))

        self.add(sourceview)

        sourceview.show()

    @staticmethod

    def apply_gedit_colors(lang):

        """Set style for lang to that specified in gedit configuration.

        This method needs the gconf module.

        :param lang: a gtksourceview.SourceLanguage object.

        """

        GEDIT_SYNTAX_PATH = '/apps/gedit-2/preferences/syntax_highlighting'

        GEDIT_LANG_PATH = GEDIT_SYNTAX_PATH + '/' + lang.get_id()

        client = gconf.client_get_default()

        client.add_dir(GEDIT_LANG_PATH, gconf.CLIENT_PRELOAD_NONE)

        for tag in lang.get_tags():

            tag_id = tag.get_id()

            gconf_key = GEDIT_LANG_PATH + '/' + tag_id

            style_string = client.get_string(gconf_key)

            if style_string is None:

                continue

            # function to get a bool from a string that's either '0' or '1'

            string_bool = lambda x: bool(int(x))

            # style_string is a string like "2/#FFCCAA/#000000/0/1/0/0"

            # values are: mask, fg, bg, italic, bold, underline, strike

            # this packs them into (str_value, attr_name, conv_func) tuples

            items = zip(style_string.split('/'), ['mask', 'foreground',

                'background', 'italic', 'bold', 'underline', 'strikethrough' ],

                [ int, gtk.gdk.color_parse, gtk.gdk.color_parse, string_bool,

                    string_bool, string_bool, string_bool ]

            )

            style = gtksourceview.SourceTagStyle()

            # XXX The mask attribute controls whether the present values of

            # foreground and background color should in fact be used. Ideally

            # (and that's what gedit does), one could set all three attributes,

            # and let the TagStyle object figure out which colors to use.

            # However, in the GtkSourceview python bindings, the mask attribute

            # is read-only, and it's derived instead from the colors being

            # set or not. This means that we have to sometimes refrain from

            # setting fg or bg colors, depending on the value of the mask.

            # This code could go away if mask were writable.

            mask = int(items[0][0])

            if not (mask & 1): # GTK_SOURCE_TAG_STYLE_USE_BACKGROUND

                items[2:3] = []

            if not (mask & 2): # GTK_SOURCE_TAG_STYLE_USE_FOREGROUND

                items[1:2] = []

            items[0:1] = [] # skip the mask unconditionally

            for value, attr, func in items:

                try:

                    value = func(value)

                except ValueError:

                    warning('gconf key %s contains an invalid value: %s'

                            % gconf_key, value)

                else:

                    setattr(style, attr, value)

            lang.set_tag_style(tag_id, style)

    @staticmethod

    def apply_colordiff_colors(lang):

        """Set style colors for lang using the colordiff configuration file.

        Both ~/.colordiffrc and ~/.colordiffrc.bzr-gtk are read.

        :param lang: a "Diff" gtksourceview.SourceLanguage object.

        """

        colors = {}

        for f in ('~/.colordiffrc', '~/.colordiffrc.bzr-gtk'):

            f = os.path.expanduser(f)

            if os.path.exists(f):

                try:

                    f = file(f)

                except IOError, e:

                    warning('could not open file %s: %s' % (f, str(e)))

                else:

                    colors.update(DiffView.parse_colordiffrc(f))

                    f.close()

        if not colors:

            # ~/.colordiffrc does not exist

            return

        mapping = {

                # map GtkSourceView tags to colordiff names

                # since GSV is richer, accept new names for extra bits,

                # defaulting to old names if they're not present

                'Added@32@line': ['newtext'],

                'Removed@32@line': ['oldtext'],

                'Location': ['location', 'diffstuff'],

                'Diff@32@file': ['file', 'diffstuff'],

                'Special@32@case': ['specialcase', 'diffstuff'],

        }

        for tag in lang.get_tags():

            tag_id = tag.get_id()

            keys = mapping.get(tag_id, [])

            color = None

            for key in keys:

                color = colors.get(key, None)

                if color is not None:

                    break

            if color is None:

                continue

            style = gtksourceview.SourceTagStyle()

            try:

                style.foreground = gtk.gdk.color_parse(color)

            except ValueError:

                warning('not a valid color: %s' % color)

            else:

                lang.set_tag_style(tag_id, style)

    @staticmethod

    def parse_colordiffrc(fileobj):

        """Parse fileobj as a colordiff configuration file.

        :return: A dict with the key -> value pairs.

        """

        colors = {}

        for line in fileobj:

            if re.match(r'^\s*#', line):

                continue

            if '=' not in line:

                continue

            key, val = line.split('=', 1)

            colors[key.strip()] = val.strip()

        return colors

    def set_trees(self, rev_tree, parent_tree):

        self.rev_tree = rev_tree

        self.parent_tree = parent_tree

#        self._build_delta()

#    def _build_delta(self):

#        self.parent_tree.lock_read()

#        self.rev_tree.lock_read()

#        try:

#            self.delta = _iter_changes_to_status(self.parent_tree, self.rev_tree)

#            self.path_to_status = {}

#            self.path_to_diff = {}

#            source_inv = self.parent_tree.inventory

#            target_inv = self.rev_tree.inventory

#            for (file_id, real_path, change_type, display_path) in self.delta:

#                self.path_to_status[real_path] = u'=== %s %s' % (change_type, display_path)

#                if change_type in ('modified', 'renamed and modified'):

#                    source_ie = source_inv[file_id]

#                    target_ie = target_inv[file_id]

#                    sio = StringIO()

#                    source_ie.diff(internal_diff, *old path, *old_tree,

#                                   *new_path, target_ie, self.rev_tree,

#                                   sio)

#                    self.path_to_diff[real_path] = 

#

#        finally:

#            self.rev_tree.unlock()

#            self.parent_tree.unlock()

    def show_diff(self, specific_files):

        s = StringIO()

        show_diff_trees(self.parent_tree, self.rev_tree, s, specific_files,

                        old_label='', new_label='',

                        # path_encoding=sys.getdefaultencoding()

                        # The default is utf-8, but we interpret the file

                        # contents as getdefaultencoding(), so we should

                        # probably try to make the paths in the same encoding.

                        )

        # str.decode(encoding, 'replace') doesn't do anything. Because if a

        # character is not valid in 'encoding' there is nothing to replace, the

        # 'replace' is for 'str.encode()'

        try:

            decoded = s.getvalue().decode(sys.getdefaultencoding())

        except UnicodeDecodeError:

            try:

                decoded = s.getvalue().decode('UTF-8')

            except UnicodeDecodeError:

                decoded = s.getvalue().decode('iso-8859-1')

                # This always works, because every byte has a valid

                # mapping from iso-8859-1 to Unicode

        # TextBuffer must contain pure UTF-8 data

        self.buffer.set_text(decoded.encode('UTF-8'))

class DiffWidget(gtk.HPaned):

    """Diff widget

    """

    def __init__(self):

        super(DiffWidget, self).__init__()

        # The file hierarchy: a scrollable treeview

        scrollwin = gtk.ScrolledWindow()

        scrollwin.set_policy(gtk.POLICY_NEVER, gtk.POLICY_AUTOMATIC)

        scrollwin.set_shadow_type(gtk.SHADOW_IN)

        self.pack1(scrollwin)

        scrollwin.show()

        self.model = gtk.TreeStore(str, str)

        self.treeview = gtk.TreeView(self.model)

        self.treeview.set_headers_visible(False)

        self.treeview.set_search_column(1)

        self.treeview.connect("cursor-changed", self._treeview_cursor_cb)

        scrollwin.add(self.treeview)

        self.treeview.show()

        cell = gtk.CellRendererText()

        cell.set_property("width-chars", 20)

        column = gtk.TreeViewColumn()

        column.pack_start(cell, expand=True)

        column.add_attribute(cell, "text", 0)

        self.treeview.append_column(column)

        # The diffs of the  selected file: a scrollable source or

        # text view

        self.diff_view = DiffView()

        self.pack2(self.diff_view)

        self.diff_view.show()

    def set_diff(self, rev_tree, parent_tree):

        """Set the differences showed by this window.

        Compares the two trees and populates the window with the

        differences.

        """

        self.diff_view.set_trees(rev_tree, parent_tree)

        self.rev_tree = rev_tree

        self.parent_tree = parent_tree

        self.model.clear()

        delta = self.rev_tree.changes_from(self.parent_tree)

        self.model.append(None, [ "Complete Diff", "" ])

        if len(delta.added):

            titer = self.model.append(None, [ "Added", None ])

            for path, id, kind in delta.added:

                self.model.append(titer, [ path, path ])

        if len(delta.removed):

            titer = self.model.append(None, [ "Removed", None ])

            for path, id, kind in delta.removed:

                self.model.append(titer, [ path, path ])

        if len(delta.renamed):

            titer = self.model.append(None, [ "Renamed", None ])

            for oldpath, newpath, id, kind, text_modified, meta_modified \

                    in delta.renamed:

                self.model.append(titer, [ oldpath, newpath ])

        if len(delta.modified):

            titer = self.model.append(None, [ "Modified", None ])

            for path, id, kind, text_modified, meta_modified in delta.modified:

                self.model.append(titer, [ path, path ])

        self.treeview.expand_all()

    def set_file(self, file_path):

        tv_path = None

        for data in self.model:

            for child in data.iterchildren():

                if child[0] == file_path or child[1] == file_path:

                    tv_path = child.path

                    break

        if tv_path is None:

            raise NoSuchFile(file_path)

        self.treeview.set_cursor(tv_path)

        self.treeview.scroll_to_cell(tv_path)

    def _treeview_cursor_cb(self, *args):

        """Callback for when the treeview cursor changes."""

        (path, col) = self.treeview.get_cursor()

        specific_files = [ self.model[path][1] ]

        if specific_files == [ None ]:

            return

        elif specific_files == [ "" ]:

            specific_files = None

        self.diff_view.show_diff(specific_files)

class DiffWindow(Window):

    """Diff window.

    This object represents and manages a single window containing the

    differences between two revisions on a branch.

    """

    def __init__(self, parent=None):

        Window.__init__(self, parent)

        self.set_border_width(0)

        self.set_title("bzrk diff")

        # Use two thirds of the screen by default

        screen = self.get_screen()

        monitor = screen.get_monitor_geometry(0)

        width = int(monitor.width * 0.66)

        height = int(monitor.height * 0.66)

        self.set_default_size(width, height)

        self.construct()

    def construct(self):

        """Construct the window contents."""

        self.diff = DiffWidget()

        self.add(self.diff)

        self.diff.show_all()

    def set_diff(self, description, rev_tree, parent_tree):

        """Set the differences showed by this window.

        Compares the two trees and populates the window with the

        differences.

        """

        self.diff.set_diff(rev_tree, parent_tree)

        self.set_title(description + " - bzrk diff")

    def set_file(self, file_path):

        self.diff.set_file(file_path)

def _iter_changes_to_status(source, target):

    """Determine the differences between trees.

    This is a wrapper around _iter_changes which just yields more

    understandable results.

    :param source: The source tree (basis tree)

    :param target: The target tree

    :return: A list of (file_id, real_path, change_type, display_path)

    """

    added = 'added'

    removed = 'removed'

    renamed = 'renamed'

    renamed_and_modified = 'renamed and modified'

    modified = 'modified'

    kind_changed = 'kind changed'

    # TODO: Handle metadata changes

    status = []

    target.lock_read()

    try:

        source.lock_read()

        try:

            for (file_id, paths, changed_content, versioned, parent_ids, names,

                 kinds, executables) in target._iter_changes(source):

                # Skip the root entry if it isn't very interesting

                if parent_ids == (None, None):

                    continue

                change_type = None

                if kinds[0] is None:

                    source_marker = ''

                else:

                    source_marker = osutils.kind_marker(kinds[0])

                if kinds[1] is None:

                    assert kinds[0] is not None

                    marker = osutils.kind_marker(kinds[0])

                else:

                    marker = osutils.kind_marker(kinds[1])

                real_path = paths[1]

                if real_path is None:

                    real_path = paths[0]

                assert real_path is not None

                display_path = real_path + marker

                present_source = versioned[0] and kinds[0] is not None

                present_target = versioned[1] and kinds[1] is not None

                if present_source != present_target:

                    if present_target:

                        change_type = added

                    else:

                        assert present_source

                        change_type = removed

                elif names[0] != names[1] or parent_ids[0] != parent_ids[1]:

                    # Renamed

                    if changed_content or executables[0] != executables[1]:

                        # and modified

                        change_type = renamed_and_modified

                    else:

                        change_type = renamed

                    display_path = (paths[0] + source_marker

                                    + ' => ' + paths[1] + marker)

                elif kinds[0] != kinds[1]:

                    change_type = kind_changed

                    display_path = (paths[0] + source_marker

                                    + ' => ' + paths[1] + marker)

                elif changed_content is True or executables[0] != executables[1]:

                    change_type = modified

                else:

                    assert False, "How did we get here?"

                status.append((file_id, real_path, change_type, display_path))

        finally:

            source.unlock()

    finally:

        target.unlock()

    return status