/b-gtk/fix-viz

"""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

from gi.repository import Gtk

from gi.repository import Pango

import os

import re

import sys

import inspect

try:

    from xml.etree.ElementTree import Element, SubElement, tostring

except ImportError:

    from elementtree.ElementTree import Element, SubElement, tostring

try:

    from gi.repository import GtkSource

    have_gtksourceview = True

except ImportError:

    have_gtksourceview = False

try:

    from gi.repository import GConf

    have_gconf = True

except ImportError:

    have_gconf = False

from bzrlib import (

    errors,

    merge as _mod_merge,

    osutils,

    urlutils,

    workingtree,

)

from bzrlib.diff import show_diff_trees

from bzrlib.patches import parse_patches

from bzrlib.trace import warning

from bzrlib.plugins.gtk.dialog import (

    error_dialog,

    info_dialog,

    warning_dialog,

    )

from bzrlib.plugins.gtk.i18n import _i18n

from bzrlib.plugins.gtk.window import Window

def fallback_guess_language(slm, content_type):

    for lang_id in slm.get_language_ids():

        lang = slm.get_language(lang_id)

        if "text/x-patch" in lang.get_mime_types():

            return lang

    return None

class SelectCancelled(Exception):

    pass

class DiffFileView(Gtk.ScrolledWindow):

    """Window for displaying diffs from a diff file"""

    def __init__(self):

        GObject.GObject.__init__(self)

        self.construct()

        self._diffs = {}

    def construct(self):

        self.set_policy(Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.AUTOMATIC)

        self.set_shadow_type(Gtk.ShadowType.IN)

        if have_gtksourceview:

            self.buffer = GtkSource.Buffer()

            slm = GtkSource.LanguageManager()

            guess_language = getattr(GtkSource.LanguageManager, 

                "guess_language", fallback_guess_language)

            gsl = guess_language(slm, content_type="text/x-patch")

            if have_gconf:

                self.apply_gedit_colors(self.buffer)

            self.apply_colordiff_colors(self.buffer)

            self.buffer.set_language(gsl)

            self.buffer.set_highlight_syntax(True)

            self.sourceview = GtkSource.View(self.buffer)

        else:

            self.buffer = Gtk.TextBuffer()

            self.sourceview = Gtk.TextView(self.buffer)

        self.sourceview.set_editable(False)

        self.sourceview.modify_font(Pango.FontDescription("Monospace"))

        self.add(self.sourceview)

        self.sourceview.show()

    @staticmethod

    def apply_gedit_colors(buf):

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

        This method needs the gconf module.

        :param buf: a GtkSource.Buffer object.

        """

        GEDIT_SCHEME_PATH = '/apps/gedit-2/preferences/editor/colors/scheme'

        GEDIT_USER_STYLES_PATH = os.path.expanduser('~/.gnome2/gedit/styles')

        client = GConf.Client.get_default()

        style_scheme_name = client.get_string(GEDIT_SCHEME_PATH)

        if style_scheme_name is not None:

            style_scheme_mgr = GtkSource.StyleSchemeManager()

            style_scheme_mgr.append_search_path(GEDIT_USER_STYLES_PATH)

            style_scheme = style_scheme_mgr.get_scheme(style_scheme_name)

            if style_scheme is not None:

                buf.set_style_scheme(style_scheme)

    @classmethod

    def apply_colordiff_colors(klass, buf):

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

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

        :param buf: a "Diff" GtkSource.Buffer object.

        """

        scheme_manager = GtkSource.StyleSchemeManager()

        style_scheme = scheme_manager.get_scheme('colordiff')

        # if style scheme not found, we'll generate it from colordiffrc

        # TODO: reload if colordiffrc has changed.

        if style_scheme is None:

            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(klass.parse_colordiffrc(f))

                        f.close()

            if not colors:

                # ~/.colordiffrc does not exist

                return

            mapping = {

                # map GtkSourceView2 scheme styles to colordiff names

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

                # defaulting to old names if they're not present

                'diff:added-line': ['newtext'],

                'diff:removed-line': ['oldtext'],

                'diff:location': ['location', 'diffstuff'],

                'diff:file': ['file', 'diffstuff'],

                'diff:special-case': ['specialcase', 'diffstuff'],

            }

            converted_colors = {}

            for name, values in mapping.items():

                color = None

                for value in values:

                    color = colors.get(value, None)

                    if color is not None:

                        break

                if color is None:

                    continue

                converted_colors[name] = color

            # some xml magic to produce needed style scheme description

            e_style_scheme = Element('style-scheme')

            e_style_scheme.set('id', 'colordiff')

            e_style_scheme.set('_name', 'ColorDiff')

            e_style_scheme.set('version', '1.0')

            for name, color in converted_colors.items():

                style = SubElement(e_style_scheme, 'style')

                style.set('name', name)

                style.set('foreground', '#%s' % color)

            scheme_xml = tostring(e_style_scheme, 'UTF-8')

            if not os.path.exists(os.path.expanduser('~/.local/share/gtksourceview-2.0/styles')):

                os.makedirs(os.path.expanduser('~/.local/share/gtksourceview-2.0/styles'))

            file(os.path.expanduser('~/.local/share/gtksourceview-2.0/styles/colordiff.xml'), 'w').write(scheme_xml)

            scheme_manager.force_rescan()

            style_scheme = scheme_manager.get_scheme('colordiff')

        buf.set_style_scheme(style_scheme)

    @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):

        sections = []

        if specific_files is None:

            self.buffer.set_text(self._diffs[None])

        else:

            for specific_file in specific_files:

                sections.append(self._diffs[specific_file])

            self.buffer.set_text(''.join(sections))

class DiffView(DiffFileView):

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

    def __init__(self):

        DiffFileView.__init__(self)

        self.rev_tree = None

        self.parent_tree = None

    def show_diff(self, specific_files):

        """Show the diff for the specified 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.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC)

        scrollwin.set_shadow_type(Gtk.ShadowType.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, True, True, 0)

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

        self.treeview.append_column(column)

    def set_diff_text(self, lines):

        """Set the current diff from a list of lines

        :param lines: The diff to show, in unified diff format

        """

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

        # text view

    def set_diff_text_sections(self, sections):

        if getattr(self, 'diff_view', None) is None:

            self.diff_view = DiffFileView()

            self.pack2(self.diff_view)

        self.diff_view.show()

        for oldname, newname, patch in sections:

            self.diff_view._diffs[newname] = str(patch)

            if newname is None:

                newname = ''

            self.model.append(None, [oldname, newname])

        self.diff_view.show_diff(None)

    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.

        """

        if getattr(self, 'diff_view', None) is None:

            self.diff_view = DiffView()

            self.pack2(self.diff_view)

        self.diff_view.show()

        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()

        self.diff_view.show_diff(None)

    def set_file(self, file_path):

        """Select the current file to display"""

        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 errors.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)

    def _on_wraplines_toggled(self, widget=None, wrap=False):

        """Callback for when the wrap lines checkbutton is toggled"""

        if wrap or widget.get_active():

            self.diff_view.sourceview.set_wrap_mode(Gtk.WrapMode.WORD)

        else:

            self.diff_view.sourceview.set_wrap_mode(Gtk.WrapMode.NONE)

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, operations=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(operations)

    def construct(self, operations):

        """Construct the window contents."""

        self.vbox = Gtk.VBox()

        self.add(self.vbox)

        self.vbox.show()

        self.diff = DiffWidget()

        self.vbox.pack_end(self.diff, True, True, 0)

        self.diff.show_all()

        # Build after DiffWidget to connect signals

        menubar = self._get_menu_bar()

        self.vbox.pack_start(menubar, False, False, 0)

        hbox = self._get_button_bar(operations)

        if hbox is not None:

            self.vbox.pack_start(hbox, False, True, 0)

    def _get_menu_bar(self):

        menubar = Gtk.MenuBar()

        # View menu

        mb_view = Gtk.MenuItem(_i18n("_View"))

        mb_view_menu = Gtk.Menu()

        mb_view_wrapsource = Gtk.CheckMenuItem(_i18n("Wrap _Long Lines"))

        mb_view_wrapsource.connect('activate', self.diff._on_wraplines_toggled)

        mb_view_wrapsource.show()

        mb_view_menu.append(mb_view_wrapsource)

        mb_view.show()

        mb_view.set_submenu(mb_view_menu)

        mb_view.show()

        menubar.append(mb_view)

        menubar.show()

        return menubar

    def _get_button_bar(self, operations):

        """Return a button bar to use.

        :return: None, meaning that no button bar will be used.

        """

        if operations is None:

            return None

        hbox = Gtk.HButtonBox()

        hbox.set_layout(Gtk.ButtonBoxStyle.START)

        for title, method in operations:

            merge_button = Gtk.Button(title)

            merge_button.show()

            merge_button.set_relief(Gtk.ReliefStyle.NONE)

            merge_button.connect("clicked", method)

            hbox.pack_start(merge_button, expand=False, fill=True)

        hbox.show()

        return hbox

    def _get_merge_target(self):

        d = Gtk.FileChooserDialog('Merge branch', self,

                                  Gtk.FileChooserAction.SELECT_FOLDER,

                                  buttons=(Gtk.STOCK_OK, Gtk.ResponseType.OK,

                                           Gtk.STOCK_CANCEL,

                                           Gtk.ResponseType.CANCEL,))

        try:

            result = d.run()

            if result != Gtk.ResponseType.OK:

                raise SelectCancelled()

            return d.get_current_folder_uri()

        finally:

            d.destroy()

    def _merge_successful(self):

        # No conflicts found.

        info_dialog(_i18n('Merge successful'),

                    _i18n('All changes applied successfully.'))

    def _conflicts(self):

        warning_dialog(_i18n('Conflicts encountered'),

                       _i18n('Please resolve the conflicts manually'

                             ' before committing.'))

    def _handle_error(self, e):

        error_dialog('Error', str(e))

    def _get_save_path(self, basename):

        d = Gtk.FileChooserDialog('Save As', self,

                                  Gtk.FileChooserAction.SAVE,

                                  buttons=(Gtk.STOCK_OK, Gtk.ResponseType.OK,

                                           Gtk.STOCK_CANCEL,

                                           Gtk.ResponseType.CANCEL,))

        d.set_current_name(basename)

        try:

            result = d.run()

            if result != Gtk.ResponseType.OK:

                raise SelectCancelled()

            return urlutils.local_path_from_url(d.get_uri())

        finally:

            d.destroy()

    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)

class DiffController(object):

    def __init__(self, path, patch, window=None, allow_dirty=False):

        self.path = path

        self.patch = patch

        self.allow_dirty = allow_dirty

        if window is None:

            window = DiffWindow(operations=self._provide_operations())

            self.initialize_window(window)

        self.window = window

    def initialize_window(self, window):

        window.diff.set_diff_text_sections(self.get_diff_sections())

        window.set_title(self.path + " - diff")

    def get_diff_sections(self):

        yield "Complete Diff", None, ''.join(self.patch)

        # allow_dirty was added to parse_patches in bzrlib 2.2b1

        if 'allow_dirty' in inspect.getargspec(parse_patches).args:

            patches = parse_patches(self.patch, allow_dirty=self.allow_dirty)

        else:

            patches = parse_patches(self.patch)

        for patch in patches:

            oldname = patch.oldname.split('\t')[0]

            newname = patch.newname.split('\t')[0]

            yield oldname, newname, str(patch)

    def perform_save(self, window):

        try:

            save_path = self.window._get_save_path(osutils.basename(self.path))

        except SelectCancelled:

            return

        source = open(self.path, 'rb')

        try:

            target = open(save_path, 'wb')

            try:

                osutils.pumpfile(source, target)

            finally:

                target.close()

        finally:

            source.close()

    def _provide_operations(self):

        return [('Save', self.perform_save)]

class MergeDirectiveController(DiffController):

    def __init__(self, path, directive, window=None):

        DiffController.__init__(self, path, directive.patch.splitlines(True),

                                window)

        self.directive = directive

        self.merge_target = None

    def _provide_operations(self):

        return [('Merge', self.perform_merge), ('Save', self.perform_save)]

    def perform_merge(self, window):

        if self.merge_target is None:

            try:

                self.merge_target = self.window._get_merge_target()

            except SelectCancelled:

                return

        tree = workingtree.WorkingTree.open(self.merge_target)

        tree.lock_write()

        try:

            try:

                if tree.has_changes():

                    raise errors.UncommittedChanges(tree)

                merger, verified = _mod_merge.Merger.from_mergeable(

                    tree, self.directive, pb=None)

                merger.merge_type = _mod_merge.Merge3Merger

                conflict_count = merger.do_merge()

                merger.set_pending()

                if conflict_count == 0:

                    self.window._merge_successful()

                else:

                    self.window._conflicts()

                    # There are conflicts to be resolved.

                self.window.destroy()

            except Exception, e:

                self.window._handle_error(e)

        finally:

            tree.unlock()

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'

    missing = 'missing'