/b-gtk/fix-viz

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  • Committer: Vincent Ladeuil
  • Date: 2009-05-06 11:51:38 UTC
  • mfrom: (628.1.2 gtk)
  • Revision ID: v.ladeuil+lp@free.fr-20090506115138-7abxvg2qz4gzraup
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diff.py
 
1
"""Difference window.
 
2
 
 
3
This module contains the code to manage the diff window which shows
 
4
the changes made between two revisions on a branch.
 
5
"""
 
6
 
 
7
__copyright__ = "Copyright 2005 Canonical Ltd."
 
8
__author__    = "Scott James Remnant <scott@ubuntu.com>"
 
9
 
 
10
 
 
11
from cStringIO import StringIO
 
12
 
 
13
import pygtk
 
14
pygtk.require("2.0")
 
15
import gtk
 
16
import pango
 
17
import os
 
18
import re
 
19
import sys
 
20
 
 
21
try:
 
22
    import gtksourceview
 
23
    have_gtksourceview = True
 
24
except ImportError:
 
25
    have_gtksourceview = False
 
26
try:
 
27
    import gconf
 
28
    have_gconf = True
 
29
except ImportError:
 
30
    have_gconf = False
 
31
 
 
32
from bzrlib import (
 
33
    merge as _mod_merge,
 
34
    osutils,
 
35
    progress,
 
36
    urlutils,
 
37
    workingtree,
 
38
)
 
39
from bzrlib.diff import show_diff_trees, internal_diff
 
40
from bzrlib.errors import NoSuchFile
 
41
from bzrlib.patches import parse_patches
 
42
from bzrlib.trace import warning
 
43
from bzrlib.plugins.gtk import _i18n
 
44
from bzrlib.plugins.gtk.window import Window
 
45
from dialog import error_dialog, info_dialog, warning_dialog
 
46
 
 
47
 
 
48
class SelectCancelled(Exception):
 
49
 
 
50
    pass
 
51
 
 
52
 
 
53
class DiffFileView(gtk.ScrolledWindow):
 
54
    """Window for displaying diffs from a diff file"""
 
55
 
 
56
    def __init__(self):
 
57
        gtk.ScrolledWindow.__init__(self)
 
58
        self.construct()
 
59
        self._diffs = {}
 
60
 
 
61
    def construct(self):
 
62
        self.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
 
63
        self.set_shadow_type(gtk.SHADOW_IN)
 
64
 
 
65
        if have_gtksourceview:
 
66
            self.buffer = gtksourceview.SourceBuffer()
 
67
            slm = gtksourceview.SourceLanguagesManager()
 
68
            gsl = slm.get_language_from_mime_type("text/x-patch")
 
69
            if have_gconf:
 
70
                self.apply_gedit_colors(gsl)
 
71
            self.apply_colordiff_colors(gsl)
 
72
            self.buffer.set_language(gsl)
 
73
            self.buffer.set_highlight(True)
 
74
 
 
75
            self.sourceview = gtksourceview.SourceView(self.buffer)
 
76
        else:
 
77
            self.buffer = gtk.TextBuffer()
 
78
            self.sourceview = gtk.TextView(self.buffer)
 
79
 
 
80
        self.sourceview.set_editable(False)
 
81
        self.sourceview.modify_font(pango.FontDescription("Monospace"))
 
82
        self.add(self.sourceview)
 
83
        self.sourceview.show()
 
84
 
 
85
    @staticmethod
 
86
    def apply_gedit_colors(lang):
 
87
        """Set style for lang to that specified in gedit configuration.
 
88
 
 
89
        This method needs the gconf module.
 
90
 
 
91
        :param lang: a gtksourceview.SourceLanguage object.
 
92
        """
 
93
        GEDIT_SYNTAX_PATH = '/apps/gedit-2/preferences/syntax_highlighting'
 
94
        GEDIT_LANG_PATH = GEDIT_SYNTAX_PATH + '/' + lang.get_id()
 
95
 
 
96
        client = gconf.client_get_default()
 
97
        client.add_dir(GEDIT_LANG_PATH, gconf.CLIENT_PRELOAD_NONE)
 
98
 
 
99
        for tag in lang.get_tags():
 
100
            tag_id = tag.get_id()
 
101
            gconf_key = GEDIT_LANG_PATH + '/' + tag_id
 
102
            style_string = client.get_string(gconf_key)
 
103
 
 
104
            if style_string is None:
 
105
                continue
 
106
 
 
107
            # function to get a bool from a string that's either '0' or '1'
 
108
            string_bool = lambda x: bool(int(x))
 
109
 
 
110
            # style_string is a string like "2/#FFCCAA/#000000/0/1/0/0"
 
111
            # values are: mask, fg, bg, italic, bold, underline, strike
 
112
            # this packs them into (str_value, attr_name, conv_func) tuples
 
113
            items = zip(style_string.split('/'), ['mask', 'foreground',
 
114
                'background', 'italic', 'bold', 'underline', 'strikethrough' ],
 
115
                [ int, gtk.gdk.color_parse, gtk.gdk.color_parse, string_bool,
 
116
                    string_bool, string_bool, string_bool ]
 
117
            )
 
118
 
 
119
            style = gtksourceview.SourceTagStyle()
 
120
 
 
121
            # XXX The mask attribute controls whether the present values of
 
122
            # foreground and background color should in fact be used. Ideally
 
123
            # (and that's what gedit does), one could set all three attributes,
 
124
            # and let the TagStyle object figure out which colors to use.
 
125
            # However, in the GtkSourceview python bindings, the mask attribute
 
126
            # is read-only, and it's derived instead from the colors being
 
127
            # set or not. This means that we have to sometimes refrain from
 
128
            # setting fg or bg colors, depending on the value of the mask.
 
129
            # This code could go away if mask were writable.
 
130
            mask = int(items[0][0])
 
131
            if not (mask & 1): # GTK_SOURCE_TAG_STYLE_USE_BACKGROUND
 
132
                items[2:3] = []
 
133
            if not (mask & 2): # GTK_SOURCE_TAG_STYLE_USE_FOREGROUND
 
134
                items[1:2] = []
 
135
            items[0:1] = [] # skip the mask unconditionally
 
136
 
 
137
            for value, attr, func in items:
 
138
                try:
 
139
                    value = func(value)
 
140
                except ValueError:
 
141
                    warning('gconf key %s contains an invalid value: %s'
 
142
                            % gconf_key, value)
 
143
                else:
 
144
                    setattr(style, attr, value)
 
145
 
 
146
            lang.set_tag_style(tag_id, style)
 
147
 
 
148
    @classmethod
 
149
    def apply_colordiff_colors(klass, lang):
 
150
        """Set style colors for lang using the colordiff configuration file.
 
151
 
 
152
        Both ~/.colordiffrc and ~/.colordiffrc.bzr-gtk are read.
 
153
 
 
154
        :param lang: a "Diff" gtksourceview.SourceLanguage object.
 
155
        """
 
156
        colors = {}
 
157
 
 
158
        for f in ('~/.colordiffrc', '~/.colordiffrc.bzr-gtk'):
 
159
            f = os.path.expanduser(f)
 
160
            if os.path.exists(f):
 
161
                try:
 
162
                    f = file(f)
 
163
                except IOError, e:
 
164
                    warning('could not open file %s: %s' % (f, str(e)))
 
165
                else:
 
166
                    colors.update(klass.parse_colordiffrc(f))
 
167
                    f.close()
 
168
 
 
169
        if not colors:
 
170
            # ~/.colordiffrc does not exist
 
171
            return
 
172
 
 
173
        mapping = {
 
174
                # map GtkSourceView tags to colordiff names
 
175
                # since GSV is richer, accept new names for extra bits,
 
176
                # defaulting to old names if they're not present
 
177
                'Added@32@line': ['newtext'],
 
178
                'Removed@32@line': ['oldtext'],
 
179
                'Location': ['location', 'diffstuff'],
 
180
                'Diff@32@file': ['file', 'diffstuff'],
 
181
                'Special@32@case': ['specialcase', 'diffstuff'],
 
182
        }
 
183
 
 
184
        for tag in lang.get_tags():
 
185
            tag_id = tag.get_id()
 
186
            keys = mapping.get(tag_id, [])
 
187
            color = None
 
188
 
 
189
            for key in keys:
 
190
                color = colors.get(key, None)
 
191
                if color is not None:
 
192
                    break
 
193
 
 
194
            if color is None:
 
195
                continue
 
196
 
 
197
            style = gtksourceview.SourceTagStyle()
 
198
            try:
 
199
                style.foreground = gtk.gdk.color_parse(color)
 
200
            except ValueError:
 
201
                warning('not a valid color: %s' % color)
 
202
            else:
 
203
                lang.set_tag_style(tag_id, style)
 
204
 
 
205
    @staticmethod
 
206
    def parse_colordiffrc(fileobj):
 
207
        """Parse fileobj as a colordiff configuration file.
 
208
 
 
209
        :return: A dict with the key -> value pairs.
 
210
        """
 
211
        colors = {}
 
212
        for line in fileobj:
 
213
            if re.match(r'^\s*#', line):
 
214
                continue
 
215
            if '=' not in line:
 
216
                continue
 
217
            key, val = line.split('=', 1)
 
218
            colors[key.strip()] = val.strip()
 
219
        return colors
 
220
 
 
221
    def set_trees(self, rev_tree, parent_tree):
 
222
        self.rev_tree = rev_tree
 
223
        self.parent_tree = parent_tree
 
224
#        self._build_delta()
 
225
 
 
226
#    def _build_delta(self):
 
227
#        self.parent_tree.lock_read()
 
228
#        self.rev_tree.lock_read()
 
229
#        try:
 
230
#            self.delta = iter_changes_to_status(self.parent_tree, self.rev_tree)
 
231
#            self.path_to_status = {}
 
232
#            self.path_to_diff = {}
 
233
#            source_inv = self.parent_tree.inventory
 
234
#            target_inv = self.rev_tree.inventory
 
235
#            for (file_id, real_path, change_type, display_path) in self.delta:
 
236
#                self.path_to_status[real_path] = u'=== %s %s' % (change_type, display_path)
 
237
#                if change_type in ('modified', 'renamed and modified'):
 
238
#                    source_ie = source_inv[file_id]
 
239
#                    target_ie = target_inv[file_id]
 
240
#                    sio = StringIO()
 
241
#                    source_ie.diff(internal_diff, *old path, *old_tree,
 
242
#                                   *new_path, target_ie, self.rev_tree,
 
243
#                                   sio)
 
244
#                    self.path_to_diff[real_path] = 
 
245
#
 
246
#        finally:
 
247
#            self.rev_tree.unlock()
 
248
#            self.parent_tree.unlock()
 
249
 
 
250
    def show_diff(self, specific_files):
 
251
        sections = []
 
252
        if specific_files is None:
 
253
            self.buffer.set_text(self._diffs[None])
 
254
        else:
 
255
            for specific_file in specific_files:
 
256
                sections.append(self._diffs[specific_file])
 
257
            self.buffer.set_text(''.join(sections))
 
258
 
 
259
 
 
260
class DiffView(DiffFileView):
 
261
    """This is the soft and chewy filling for a DiffWindow."""
 
262
 
 
263
    def __init__(self):
 
264
        DiffFileView.__init__(self)
 
265
        self.rev_tree = None
 
266
        self.parent_tree = None
 
267
 
 
268
    def show_diff(self, specific_files):
 
269
        """Show the diff for the specified files"""
 
270
        s = StringIO()
 
271
        show_diff_trees(self.parent_tree, self.rev_tree, s, specific_files,
 
272
                        old_label='', new_label='',
 
273
                        # path_encoding=sys.getdefaultencoding()
 
274
                        # The default is utf-8, but we interpret the file
 
275
                        # contents as getdefaultencoding(), so we should
 
276
                        # probably try to make the paths in the same encoding.
 
277
                        )
 
278
        # str.decode(encoding, 'replace') doesn't do anything. Because if a
 
279
        # character is not valid in 'encoding' there is nothing to replace, the
 
280
        # 'replace' is for 'str.encode()'
 
281
        try:
 
282
            decoded = s.getvalue().decode(sys.getdefaultencoding())
 
283
        except UnicodeDecodeError:
 
284
            try:
 
285
                decoded = s.getvalue().decode('UTF-8')
 
286
            except UnicodeDecodeError:
 
287
                decoded = s.getvalue().decode('iso-8859-1')
 
288
                # This always works, because every byte has a valid
 
289
                # mapping from iso-8859-1 to Unicode
 
290
        # TextBuffer must contain pure UTF-8 data
 
291
        self.buffer.set_text(decoded.encode('UTF-8'))
 
292
 
 
293
 
 
294
class DiffWidget(gtk.HPaned):
 
295
    """Diff widget
 
296
 
 
297
    """
 
298
    def __init__(self):
 
299
        super(DiffWidget, self).__init__()
 
300
 
 
301
        # The file hierarchy: a scrollable treeview
 
302
        scrollwin = gtk.ScrolledWindow()
 
303
        scrollwin.set_policy(gtk.POLICY_NEVER, gtk.POLICY_AUTOMATIC)
 
304
        scrollwin.set_shadow_type(gtk.SHADOW_IN)
 
305
        self.pack1(scrollwin)
 
306
        scrollwin.show()
 
307
        
 
308
        self.model = gtk.TreeStore(str, str)
 
309
        self.treeview = gtk.TreeView(self.model)
 
310
        self.treeview.set_headers_visible(False)
 
311
        self.treeview.set_search_column(1)
 
312
        self.treeview.connect("cursor-changed", self._treeview_cursor_cb)
 
313
        scrollwin.add(self.treeview)
 
314
        self.treeview.show()
 
315
 
 
316
        cell = gtk.CellRendererText()
 
317
        cell.set_property("width-chars", 20)
 
318
        column = gtk.TreeViewColumn()
 
319
        column.pack_start(cell, expand=True)
 
320
        column.add_attribute(cell, "text", 0)
 
321
        self.treeview.append_column(column)
 
322
 
 
323
    def set_diff_text(self, lines):
 
324
        """Set the current diff from a list of lines
 
325
 
 
326
        :param lines: The diff to show, in unified diff format
 
327
        """
 
328
        # The diffs of the  selected file: a scrollable source or
 
329
        # text view
 
330
 
 
331
    def set_diff_text_sections(self, sections):
 
332
        if getattr(self, 'diff_view', None) is None:
 
333
            self.diff_view = DiffFileView()
 
334
            self.pack2(self.diff_view)
 
335
        self.diff_view.show()
 
336
        for oldname, newname, patch in sections:
 
337
            self.diff_view._diffs[newname] = str(patch)
 
338
            if newname is None:
 
339
                newname = ''
 
340
            self.model.append(None, [oldname, newname])
 
341
        self.diff_view.show_diff(None)
 
342
 
 
343
    def set_diff(self, rev_tree, parent_tree):
 
344
        """Set the differences showed by this window.
 
345
 
 
346
        Compares the two trees and populates the window with the
 
347
        differences.
 
348
        """
 
349
        if getattr(self, 'diff_view', None) is None:
 
350
            self.diff_view = DiffView()
 
351
            self.pack2(self.diff_view)
 
352
        self.diff_view.show()
 
353
        self.diff_view.set_trees(rev_tree, parent_tree)
 
354
        self.rev_tree = rev_tree
 
355
        self.parent_tree = parent_tree
 
356
 
 
357
        self.model.clear()
 
358
        delta = self.rev_tree.changes_from(self.parent_tree)
 
359
 
 
360
        self.model.append(None, [ "Complete Diff", "" ])
 
361
 
 
362
        if len(delta.added):
 
363
            titer = self.model.append(None, [ "Added", None ])
 
364
            for path, id, kind in delta.added:
 
365
                self.model.append(titer, [ path, path ])
 
366
 
 
367
        if len(delta.removed):
 
368
            titer = self.model.append(None, [ "Removed", None ])
 
369
            for path, id, kind in delta.removed:
 
370
                self.model.append(titer, [ path, path ])
 
371
 
 
372
        if len(delta.renamed):
 
373
            titer = self.model.append(None, [ "Renamed", None ])
 
374
            for oldpath, newpath, id, kind, text_modified, meta_modified \
 
375
                    in delta.renamed:
 
376
                self.model.append(titer, [ oldpath, newpath ])
 
377
 
 
378
        if len(delta.modified):
 
379
            titer = self.model.append(None, [ "Modified", None ])
 
380
            for path, id, kind, text_modified, meta_modified in delta.modified:
 
381
                self.model.append(titer, [ path, path ])
 
382
 
 
383
        self.treeview.expand_all()
 
384
        self.diff_view.show_diff(None)
 
385
 
 
386
    def set_file(self, file_path):
 
387
        """Select the current file to display"""
 
388
        tv_path = None
 
389
        for data in self.model:
 
390
            for child in data.iterchildren():
 
391
                if child[0] == file_path or child[1] == file_path:
 
392
                    tv_path = child.path
 
393
                    break
 
394
        if tv_path is None:
 
395
            raise NoSuchFile(file_path)
 
396
        self.treeview.set_cursor(tv_path)
 
397
        self.treeview.scroll_to_cell(tv_path)
 
398
 
 
399
    def _treeview_cursor_cb(self, *args):
 
400
        """Callback for when the treeview cursor changes."""
 
401
        (path, col) = self.treeview.get_cursor()
 
402
        specific_files = [ self.model[path][1] ]
 
403
        if specific_files == [ None ]:
 
404
            return
 
405
        elif specific_files == [ "" ]:
 
406
            specific_files = None
 
407
        
 
408
        self.diff_view.show_diff(specific_files)
 
409
    
 
410
    def _on_wraplines_toggled(self, widget=None, wrap=False):
 
411
        """Callback for when the wrap lines checkbutton is toggled"""
 
412
        if wrap or widget.get_active():
 
413
            self.diff_view.sourceview.set_wrap_mode(gtk.WRAP_WORD)
 
414
        else:
 
415
            self.diff_view.sourceview.set_wrap_mode(gtk.WRAP_NONE)
 
416
 
 
417
class DiffWindow(Window):
 
418
    """Diff window.
 
419
 
 
420
    This object represents and manages a single window containing the
 
421
    differences between two revisions on a branch.
 
422
    """
 
423
 
 
424
    def __init__(self, parent=None, operations=None):
 
425
        Window.__init__(self, parent)
 
426
        self.set_border_width(0)
 
427
        self.set_title("bzrk diff")
 
428
 
 
429
        # Use two thirds of the screen by default
 
430
        screen = self.get_screen()
 
431
        monitor = screen.get_monitor_geometry(0)
 
432
        width = int(monitor.width * 0.66)
 
433
        height = int(monitor.height * 0.66)
 
434
        self.set_default_size(width, height)
 
435
        self.construct(operations)
 
436
 
 
437
    def construct(self, operations):
 
438
        """Construct the window contents."""
 
439
        self.vbox = gtk.VBox()
 
440
        self.add(self.vbox)
 
441
        self.vbox.show()
 
442
        self.diff = DiffWidget()
 
443
        self.vbox.pack_end(self.diff, True, True, 0)
 
444
        self.diff.show_all()
 
445
        # Build after DiffWidget to connect signals
 
446
        menubar = self._get_menu_bar()
 
447
        self.vbox.pack_start(menubar, False, False, 0)
 
448
        hbox = self._get_button_bar(operations)
 
449
        if hbox is not None:
 
450
            self.vbox.pack_start(hbox, False, True, 0)
 
451
        
 
452
    
 
453
    def _get_menu_bar(self):
 
454
        menubar = gtk.MenuBar()
 
455
        # View menu
 
456
        mb_view = gtk.MenuItem(_i18n("_View"))
 
457
        mb_view_menu = gtk.Menu()
 
458
        mb_view_wrapsource = gtk.CheckMenuItem(_i18n("Wrap _Long Lines"))
 
459
        mb_view_wrapsource.connect('activate', self.diff._on_wraplines_toggled)
 
460
        mb_view_wrapsource.show()
 
461
        mb_view_menu.append(mb_view_wrapsource)
 
462
        mb_view.show()
 
463
        mb_view.set_submenu(mb_view_menu)
 
464
        mb_view.show()
 
465
        menubar.append(mb_view)
 
466
        menubar.show()
 
467
        return menubar
 
468
    
 
469
    def _get_button_bar(self, operations):
 
470
        """Return a button bar to use.
 
471
 
 
472
        :return: None, meaning that no button bar will be used.
 
473
        """
 
474
        if operations is None:
 
475
            return None
 
476
        hbox = gtk.HButtonBox()
 
477
        hbox.set_layout(gtk.BUTTONBOX_START)
 
478
        for title, method in operations:
 
479
            merge_button = gtk.Button(title)
 
480
            merge_button.show()
 
481
            merge_button.set_relief(gtk.RELIEF_NONE)
 
482
            merge_button.connect("clicked", method)
 
483
            hbox.pack_start(merge_button, expand=False, fill=True)
 
484
        hbox.show()
 
485
        return hbox
 
486
 
 
487
    def _get_merge_target(self):
 
488
        d = gtk.FileChooserDialog('Merge branch', self,
 
489
                                  gtk.FILE_CHOOSER_ACTION_SELECT_FOLDER,
 
490
                                  buttons=(gtk.STOCK_OK, gtk.RESPONSE_OK,
 
491
                                           gtk.STOCK_CANCEL,
 
492
                                           gtk.RESPONSE_CANCEL,))
 
493
        try:
 
494
            result = d.run()
 
495
            if result != gtk.RESPONSE_OK:
 
496
                raise SelectCancelled()
 
497
            return d.get_current_folder_uri()
 
498
        finally:
 
499
            d.destroy()
 
500
 
 
501
    def _merge_successful(self):
 
502
        # No conflicts found.
 
503
        info_dialog(_i18n('Merge successful'),
 
504
                    _i18n('All changes applied successfully.'))
 
505
 
 
506
    def _conflicts(self):
 
507
        warning_dialog(_i18n('Conflicts encountered'),
 
508
                       _i18n('Please resolve the conflicts manually'
 
509
                             ' before committing.'))
 
510
 
 
511
    def _handle_error(self, e):
 
512
        error_dialog('Error', str(e))
 
513
 
 
514
    def _get_save_path(self, basename):
 
515
        d = gtk.FileChooserDialog('Save As', self,
 
516
                                  gtk.FILE_CHOOSER_ACTION_SAVE,
 
517
                                  buttons=(gtk.STOCK_OK, gtk.RESPONSE_OK,
 
518
                                           gtk.STOCK_CANCEL,
 
519
                                           gtk.RESPONSE_CANCEL,))
 
520
        d.set_current_name(basename)
 
521
        try:
 
522
            result = d.run()
 
523
            if result != gtk.RESPONSE_OK:
 
524
                raise SelectCancelled()
 
525
            return urlutils.local_path_from_url(d.get_uri())
 
526
        finally:
 
527
            d.destroy()
 
528
 
 
529
    def set_diff(self, description, rev_tree, parent_tree):
 
530
        """Set the differences showed by this window.
 
531
 
 
532
        Compares the two trees and populates the window with the
 
533
        differences.
 
534
        """
 
535
        self.diff.set_diff(rev_tree, parent_tree)
 
536
        self.set_title(description + " - bzrk diff")
 
537
 
 
538
    def set_file(self, file_path):
 
539
        self.diff.set_file(file_path)
 
540
 
 
541
 
 
542
class DiffController(object):
 
543
 
 
544
    def __init__(self, path, patch, window=None):
 
545
        self.path = path
 
546
        self.patch = patch
 
547
        if window is None:
 
548
            window = DiffWindow(operations=self._provide_operations())
 
549
            self.initialize_window(window)
 
550
        self.window = window
 
551
 
 
552
    def initialize_window(self, window):
 
553
        window.diff.set_diff_text_sections(self.get_diff_sections())
 
554
        window.set_title(self.path + " - diff")
 
555
 
 
556
    def get_diff_sections(self):
 
557
        yield "Complete Diff", None, ''.join(self.patch)
 
558
        for patch in parse_patches(self.patch):
 
559
            oldname = patch.oldname.split('\t')[0]
 
560
            newname = patch.newname.split('\t')[0]
 
561
            yield oldname, newname, str(patch)
 
562
 
 
563
    def perform_save(self, window):
 
564
        try:
 
565
            save_path = self.window._get_save_path(osutils.basename(self.path))
 
566
        except SelectCancelled:
 
567
            return
 
568
        source = open(self.path, 'rb')
 
569
        try:
 
570
            target = open(save_path, 'wb')
 
571
            try:
 
572
                osutils.pumpfile(source, target)
 
573
            finally:
 
574
                target.close()
 
575
        finally:
 
576
            source.close()
 
577
 
 
578
    def _provide_operations(self):
 
579
        return [('Save', self.perform_save)]
 
580
 
 
581
 
 
582
class MergeDirectiveController(DiffController):
 
583
 
 
584
    def __init__(self, path, directive, window=None):
 
585
        DiffController.__init__(self, path, directive.patch.splitlines(True),
 
586
                                window)
 
587
        self.directive = directive
 
588
        self.merge_target = None
 
589
 
 
590
    def _provide_operations(self):
 
591
        return [('Merge', self.perform_merge), ('Save', self.perform_save)]
 
592
 
 
593
    def perform_merge(self, window):
 
594
        if self.merge_target is None:
 
595
            try:
 
596
                self.merge_target = self.window._get_merge_target()
 
597
            except SelectCancelled:
 
598
                return
 
599
        tree = workingtree.WorkingTree.open(self.merge_target)
 
600
        tree.lock_write()
 
601
        try:
 
602
            try:
 
603
                merger, verified = _mod_merge.Merger.from_mergeable(tree,
 
604
                    self.directive, progress.DummyProgress())
 
605
                merger.check_basis(True)
 
606
                merger.merge_type = _mod_merge.Merge3Merger
 
607
                conflict_count = merger.do_merge()
 
608
                merger.set_pending()
 
609
                if conflict_count == 0:
 
610
                    self.window._merge_successful()
 
611
                else:
 
612
                    self.window._conflicts()
 
613
                    # There are conflicts to be resolved.
 
614
                self.window.destroy()
 
615
            except Exception, e:
 
616
                self.window._handle_error(e)
 
617
        finally:
 
618
            tree.unlock()
 
619
 
 
620
 
 
621
def iter_changes_to_status(source, target):
 
622
    """Determine the differences between trees.
 
623
 
 
624
    This is a wrapper around iter_changes which just yields more
 
625
    understandable results.
 
626
 
 
627
    :param source: The source tree (basis tree)
 
628
    :param target: The target tree
 
629
    :return: A list of (file_id, real_path, change_type, display_path)
 
630
    """
 
631
    added = 'added'
 
632
    removed = 'removed'
 
633
    renamed = 'renamed'
 
634
    renamed_and_modified = 'renamed and modified'
 
635
    modified = 'modified'
 
636
    kind_changed = 'kind changed'
 
637
    missing = 'missing'
 
638
 
 
639
    # TODO: Handle metadata changes
 
640
 
 
641
    status = []
 
642
    target.lock_read()
 
643
    try:
 
644
        source.lock_read()
 
645
        try:
 
646
            for (file_id, paths, changed_content, versioned, parent_ids, names,
 
647
                 kinds, executables) in target.iter_changes(source):
 
648
 
 
649
                # Skip the root entry if it isn't very interesting
 
650
                if parent_ids == (None, None):
 
651
                    continue
 
652
 
 
653
                change_type = None
 
654
                if kinds[0] is None:
 
655
                    source_marker = ''
 
656
                else:
 
657
                    source_marker = osutils.kind_marker(kinds[0])
 
658
 
 
659
                if kinds[1] is None:
 
660
                    if kinds[0] is None:
 
661
                        # We assume bzr will flag only files in that case,
 
662
                        # there may be a bzr bug there as only files seems to
 
663
                        # not receive any kind.
 
664
                        marker = osutils.kind_marker('file')
 
665
                    else:
 
666
                        marker = osutils.kind_marker(kinds[0])
 
667
                else:
 
668
                    marker = osutils.kind_marker(kinds[1])
 
669
 
 
670
                real_path = paths[1]
 
671
                if real_path is None:
 
672
                    real_path = paths[0]
 
673
                assert real_path is not None
 
674
 
 
675
                present_source = versioned[0] and kinds[0] is not None
 
676
                present_target = versioned[1] and kinds[1] is not None
 
677
 
 
678
                if kinds[0] is None and kinds[1] is None:
 
679
                    change_type = missing
 
680
                    display_path = real_path + marker
 
681
                elif present_source != present_target:
 
682
                    if present_target:
 
683
                        change_type = added
 
684
                    else:
 
685
                        assert present_source
 
686
                        change_type = removed
 
687
                    display_path = real_path + marker
 
688
                elif names[0] != names[1] or parent_ids[0] != parent_ids[1]:
 
689
                    # Renamed
 
690
                    if changed_content or executables[0] != executables[1]:
 
691
                        # and modified
 
692
                        change_type = renamed_and_modified
 
693
                    else:
 
694
                        change_type = renamed
 
695
                    display_path = (paths[0] + source_marker
 
696
                                    + ' => ' + paths[1] + marker)
 
697
                elif kinds[0] != kinds[1]:
 
698
                    change_type = kind_changed
 
699
                    display_path = (paths[0] + source_marker
 
700
                                    + ' => ' + paths[1] + marker)
 
701
                elif changed_content or executables[0] != executables[1]:
 
702
                    change_type = modified
 
703
                    display_path = real_path + marker
 
704
                else:
 
705
                    assert False, "How did we get here?"
 
706
 
 
707
                status.append((file_id, real_path, change_type, display_path))
 
708
        finally:
 
709
            source.unlock()
 
710
    finally:
 
711
        target.unlock()
 
712
 
 
713
    return status