Source

trac-ticketlinks / trac / versioncontrol / web_ui / browser.py

Full commit
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
# -*- coding: utf-8 -*-
#
# Copyright (C) 2003-2009 Edgewall Software
# Copyright (C) 2003-2005 Jonas Borgström <jonas@edgewall.com>
# Copyright (C) 2005-2007 Christian Boos <cboos@neuf.fr>
# All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://trac.edgewall.org/wiki/TracLicense.
#
# This software consists of voluntary contributions made by many
# individuals. For the exact contribution history, see the revision
# history and logs, available at http://trac.edgewall.org/log/.
#
# Author: Jonas Borgström <jonas@edgewall.com>

from datetime import datetime, timedelta
from fnmatch import fnmatchcase
import re

from genshi.builder import tag

from trac.config import ListOption, BoolOption, Option
from trac.core import *
from trac.mimeview.api import Mimeview, is_binary, \
                              IHTMLPreviewAnnotator, Context
from trac.perm import IPermissionRequestor
from trac.resource import Resource, ResourceNotFound
from trac.util import as_bool, embedded_numbers
from trac.util.compat import any, cleandoc
from trac.util.datefmt import http_date, to_datetime, utc
from trac.util.html import escape, Markup
from trac.util.text import exception_to_unicode, shorten_line
from trac.util.translation import _
from trac.web import IRequestHandler, RequestDone
from trac.web.chrome import add_ctxtnav, add_link, add_script, add_stylesheet, \
                            prevnext_nav, INavigationContributor
from trac.wiki.api import IWikiSyntaxProvider, IWikiMacroProvider, parse_args
from trac.wiki.formatter import format_to_html, format_to_oneliner
from trac.versioncontrol.api import NoSuchChangeset, RepositoryManager
from trac.versioncontrol.web_ui.util import *


CHUNK_SIZE = 4096


class IPropertyRenderer(Interface):
    """Render node properties in TracBrowser and TracChangeset views."""

    def match_property(name, mode):
        """Indicate whether this renderer can treat the given property

        `mode` is the current rendering context, which can be:
         - 'browser' rendered in the browser view
         - 'changeset' rendered in the changeset view as a node property
         - 'revprop' rendered in the changeset view as a revision property
        Other identifiers might be used by plugins, so it's advised to simply
        ignore unknown modes.

        Returns a quality number, ranging from 0 (unsupported) to 9
        (''perfect'' match).
        """

    def render_property(name, mode, context, props):
        """Render the given property.

        `name` is the property name as given to `match()`,
        `mode` is the same as for `match_property`,
        `context` is the context for the node being render
        (useful when the rendering depends on the node kind) and
        `props` is the collection of the corresponding properties
        (i.e. the `node.get_properties()`).

        The rendered result can be one of the following:
        - `None`: the property will be skipped
        - an `unicode` value: the property will be displayed as text
        - a `RenderedProperty` instance: the property will only be displayed
          using the instance's `content` attribute, and the other attributes
          will also be used in some display contexts (like `revprop`)
        - `Markup` or other Genshi content: the property will be displayed
          normally, using that content as a block-level markup
        """


class RenderedProperty(object):
    def __init__(self, name=None, name_attributes=None,
                 content=None, content_attributes=None):
        self.name = name
        self.name_attributes = name_attributes
        self.content = content
        self.content_attributes = content_attributes


class DefaultPropertyRenderer(Component):
    """Default version control property renderer."""

    implements(IPropertyRenderer)

    def match_property(self, name, mode):
        return 1

    def render_property(self, name, mode, context, props):
        # No special treatment besides respecting newlines in values.
        value = props[name]
        if value and '\n' in value:
            value = Markup(''.join(['<br />%s' % escape(v)
                                    for v in value.split('\n')]))
        return value


class WikiPropertyRenderer(Component):
    """Wiki text property renderer."""

    implements(IPropertyRenderer)

    wiki_properties = ListOption('browser', 'wiki_properties',
                                 'trac:description',
        doc="""Comma-separated list of version control properties to render
        as wiki content in the repository browser.

        (''since 0.11'')""")

    oneliner_properties = ListOption('browser', 'oneliner_properties',
                                 'trac:summary',
        doc="""Comma-separated list of version control properties to render
        as oneliner wiki content in the repository browser.

        (''since 0.11'')""")

    def match_property(self, name, mode):
        return (name in self.wiki_properties or \
                name in self.oneliner_properties) and 4 or 0

    def render_property(self, name, mode, context, props):
        if name in self.wiki_properties:
            return format_to_html(self.env, context, props[name])
        else:
            return format_to_oneliner(self.env, context, props[name])


class TimeRange(object):

    min = datetime(1, 1, 1, 0, 0, 0, 0, utc) # tz aware version of datetime.min
    
    def __init__(self, base):
        self.oldest = self.newest = base
        self._total = None

    def seconds_between(self, dt1, dt2):
        delta = dt1 - dt2
        return delta.days * 24 * 3600 + delta.seconds
    
    def to_seconds(self, dt):
        return self.seconds_between(dt, TimeRange.min)

    def from_seconds(self, secs):
        return TimeRange.min + timedelta(*divmod(secs, 24* 3600))

    def relative(self, datetime):
        if self._total is None:
            self._total = float(self.seconds_between(self.newest, self.oldest))
        age = 1.0
        if self._total:
            age = self.seconds_between(datetime, self.oldest) / self._total
        return age

    def insert(self, datetime):
        self._total = None
        self.oldest = min(self.oldest, datetime)
        self.newest = max(self.newest, datetime)



class BrowserModule(Component):

    implements(INavigationContributor, IPermissionRequestor, IRequestHandler,
               IWikiSyntaxProvider, IHTMLPreviewAnnotator, 
               IWikiMacroProvider)

    property_renderers = ExtensionPoint(IPropertyRenderer)

    downloadable_paths = ListOption('browser', 'downloadable_paths',
                                    '/trunk, /branches/*, /tags/*',
        doc="""List of repository paths that can be downloaded.
        
        Leave the option empty if you want to disable all downloads, otherwise
        set it to a comma-separated list of authorized paths (those paths are
        glob patterns, i.e. "*" can be used as a wild card)
        (''since 0.10'')""")

    color_scale = BoolOption('browser', 'color_scale', True,
        doc="""Enable colorization of the ''age'' column.
        
        This uses the same color scale as the source code annotation:
        blue is older, red is newer.
        (''since 0.11'')""")

    NEWEST_COLOR = (255, 136, 136)

    newest_color = Option('browser', 'newest_color', repr(NEWEST_COLOR),
        doc="""(r,g,b) color triple to use for the color corresponding
        to the newest color, for the color scale used in ''blame'' or
        the browser ''age'' column if `color_scale` is enabled.
        (''since 0.11'')""")

    OLDEST_COLOR = (136, 136, 255)

    oldest_color = Option('browser', 'oldest_color', repr(OLDEST_COLOR),
        doc="""(r,g,b) color triple to use for the color corresponding
        to the oldest color, for the color scale used in ''blame'' or
        the browser ''age'' column if `color_scale` is enabled.
        (''since 0.11'')""")

    intermediate_point = Option('browser', 'intermediate_point', '',
        doc="""If set to a value between 0 and 1 (exclusive), this will be the
        point chosen to set the `intermediate_color` for interpolating
        the color value.
        (''since 0.11'')""")

    intermediate_color = Option('browser', 'intermediate_color', '',
        doc="""(r,g,b) color triple to use for the color corresponding
        to the intermediate color, if two linear interpolations are used
        for the color scale (see `intermediate_point`).
        If not set, the intermediate color between `oldest_color` and
        `newest_color` will be used.
        (''since 0.11'')""")

    render_unsafe_content = BoolOption('browser', 'render_unsafe_content',
                                        'false',
        """Whether raw files should be rendered in the browser, or only made 
        downloadable.
 
        Pretty much any file may be interpreted as HTML by the browser,
        which allows a malicious user to create a file containing cross-site
        scripting attacks.
        
        For open repositories where anyone can check-in a file, it is
        recommended to leave this option disabled (which is the default).""")

    hidden_properties = ListOption('browser', 'hide_properties', 'svk:merge',
        doc="""Comma-separated list of version control properties to hide from
        the repository browser.
        (''since 0.9'')""")

    # public methods

    def get_custom_colorizer(self):
        """Returns a converter for values from [0.0, 1.0] to a RGB triple."""
        
        def interpolate(old, new, value):
            # Provides a linearly interpolated color triple for `value`
            # which must be a floating point value between 0.0 and 1.0
            return tuple([int(b + (a - b) * value) for a, b in zip(new, old)])

        def parse_color(rgb, default):
            # Get three ints out of a `rgb` string or return `default`
            try:
                t = tuple([int(v) for v in re.split(r'(\d+)', rgb)[1::2]])
                return len(t) == 3 and t or default
            except ValueError:
                return default
        
        newest_color = parse_color(self.newest_color, self.NEWEST_COLOR)
        oldest_color = parse_color(self.oldest_color, self.OLDEST_COLOR)
        try:
            intermediate = float(self.intermediate_point)
        except ValueError:
            intermediate = None
        if intermediate:
            intermediate_color = parse_color(self.intermediate_color, None)
            if not intermediate_color:
                intermediate_color = tuple([(a + b) / 2 for a, b in
                                            zip(newest_color, oldest_color)])
            def colorizer(value):
                if value <= intermediate:
                    value = value / intermediate
                    return interpolate(oldest_color, intermediate_color, value)
                else:
                    value = (value - intermediate) / (1.0 - intermediate)
                    return interpolate(intermediate_color, newest_color, value)
        else:
            def colorizer(value):
                return interpolate(oldest_color, newest_color, value)
        return colorizer
        
    # INavigationContributor methods

    def get_active_navigation_item(self, req):
        return 'browser'

    def get_navigation_items(self, req):
        rm = RepositoryManager(self.env)
        if 'BROWSER_VIEW' in req.perm and rm.get_real_repositories():
            yield ('mainnav', 'browser',
                   tag.a(_('Browse Source'), href=req.href.browser()))

    # IPermissionRequestor methods

    def get_permission_actions(self):
        return ['BROWSER_VIEW', 'FILE_VIEW']

    # IRequestHandler methods

    def match_request(self, req):
        match = re.match(r'/(export|browser|file)(/.*)?$', req.path_info)
        if match:
            mode, path = match.groups()
            if mode == 'export':
                if path and '/' in path:
                    path_elts = path.split('/', 2)
                    if len(path_elts) != 3:
                        return False
                    path = path_elts[2]
                    req.args['rev'] = path_elts[1]
                    req.args['format'] = 'raw'
            elif mode == 'file':
                req.redirect(req.href.browser(path, rev=req.args.get('rev'),
                                              format=req.args.get('format')),
                             permanent=True)
            req.args['path'] = path or '/'
            return True

    def process_request(self, req):
        req.perm.require('BROWSER_VIEW')

        presel = req.args.get('preselected')
        if presel and (presel + '/').startswith(req.href.browser() + '/'):
            req.redirect(presel)

        path = req.args.get('path', '/')
        rev = req.args.get('rev', '')
        if rev in ('', 'HEAD'):
            rev = None
        order = req.args.get('order', 'name').lower()
        desc = req.args.has_key('desc')
        xhr = req.get_header('X-Requested-With') == 'XMLHttpRequest'
        
        rm = RepositoryManager(self.env)
        all_repositories = rm.get_all_repositories()
        reponame, repos, path = rm.get_repository_by_path(path)

        # Repository index
        show_index = not reponame and path == '/'
        if show_index:
            if repos and (as_bool(all_repositories[''].get('hidden'))
                          or not repos.can_view(req.perm)):
                repos = None

        if not repos and reponame:
            raise ResourceNotFound(_("Repository '%(repo)s' not found",
                                     repo=reponame))

        if reponame and reponame != repos.reponame: # Redirect alias
            qs = req.query_string
            req.redirect(req.href.browser(repos.reponame or None, path)
                         + (qs and '?' + qs or ''))
        reponame = repos and repos.reponame or None
        
        # Find node for the requested path/rev
        context = Context.from_request(req)
        node = None
        display_rev = lambda rev: rev
        if repos:
            try:
                if rev:
                    rev = repos.normalize_rev(rev)
                # If `rev` is `None`, we'll try to reuse `None` consistently,
                # as a special shortcut to the latest revision.
                rev_or_latest = rev or repos.youngest_rev
                node = get_existing_node(req, repos, path, rev_or_latest)
            except NoSuchChangeset, e:
                raise ResourceNotFound(e.message,
                                       _('Invalid changeset number'))

            context = context(repos.resource.child('source', path,
                                                   version=rev_or_latest))
            display_rev = repos.display_rev

        # Prepare template data
        path_links = get_path_links(req.href, reponame, path, rev,
                                    order, desc)

        repo_data = dir_data = file_data = None
        if show_index:
            repo_data = self._render_repository_index(
                                        context, all_repositories, order, desc)
        if node:
            if node.isdir:
                dir_data = self._render_dir(req, repos, node, rev, order, desc)
            elif node.isfile:
                file_data = self._render_file(req, context, repos, node, rev)

        if not repos and not (repo_data and repo_data['repositories']):
            raise ResourceNotFound(_("No node %(path)s", path=path))

        quickjump_data = properties_data = None
        if node and not xhr:
            properties_data = self.render_properties(
                    'browser', context, node.get_properties())
            quickjump_data = list(repos.get_quickjump_entries(rev))

        data = {
            'context': context, 'reponame': reponame, 'repos': repos,
            'repoinfo': all_repositories.get(reponame or ''),
            'path': path, 'rev': node and node.rev, 'stickyrev': rev,
            'display_rev': display_rev,
            'created_path': node and node.created_path,
            'created_rev': node and node.created_rev,
            'properties': properties_data,
            'path_links': path_links,
            'order': order, 'desc': desc and 1 or None,
            'repo': repo_data, 'dir': dir_data, 'file': file_data,
            'quickjump_entries': quickjump_data,
            'wiki_format_messages': \
                self.config['changeset'].getbool('wiki_format_messages'),
            'xhr': xhr,
        }                   
        if xhr: # render and return the content only
            return 'dir_entries.html', data, None

        if dir_data or repo_data:
            add_script(req, 'common/js/expand_dir.js')
            add_script(req, 'common/js/keyboard_nav.js')

        # Links for contextual navigation
        if node:
            if node.isfile:
                prev_rev = repos.previous_rev(rev=node.rev,
                                              path=node.created_path)
                if prev_rev:
                    href = req.href.browser(reponame,
                                            node.created_path, rev=prev_rev)
                    add_link(req, 'prev', href,
                             _('Revision %(num)s', num=display_rev(prev_rev)))
                if rev is not None:
                    add_link(req, 'up', req.href.browser(reponame,
                                                         node.created_path))
                next_rev = repos.next_rev(rev=node.rev,
                                          path=node.created_path)
                if next_rev:
                    href = req.href.browser(reponame, node.created_path,
                                            rev=next_rev)
                    add_link(req, 'next', href,
                             _('Revision %(num)s', num=display_rev(next_rev)))
                prevnext_nav(req, _('Previous Revision'), _('Next Revision'),
                             _('Latest Revision'))
            else:
                if path != '/':
                    add_link(req, 'up', path_links[-2]['href'],
                             _('Parent directory'))
                add_ctxtnav(req, tag.a(_('Last Change'), 
                            href=req.href.changeset(node.rev, reponame,
                                                    node.created_path)))
            if node.isfile:
                annotate = data['file']['annotate']
                if annotate:
                    add_ctxtnav(req, _('Normal'), 
                                title=_('View file without annotations'), 
                                href=req.href.browser(reponame,
                                                      node.created_path, 
                                                      rev=rev))
                if annotate != 'blame':
                    add_ctxtnav(req, _('Blame'), 
                                title=_('Annotate each line with the last '
                                        'changed revision '
                                        '(this can be time consuming...)'), 
                                href=req.href.browser(reponame,
                                                      node.created_path, 
                                                      rev=rev,
                                                      annotate='blame'))
            add_ctxtnav(req, _('Revision Log'), 
                        href=req.href.log(reponame, path, rev=rev))
            path_url = repos.get_path_url(path, rev)
            if path_url:
                if path_url.startswith('//'):
                    path_url = req.scheme + ':' + path_url
                add_ctxtnav(req, _('Repository URL'), href=path_url)

        add_stylesheet(req, 'common/css/browser.css')
        return 'browser.html', data, None

    # Internal methods

    def _render_repository_index(self, context, all_repositories, order, desc):
        # Color scale for the age column
        timerange = custom_colorizer = None
        if self.color_scale:
            custom_colorizer = self.get_custom_colorizer()

        rm = RepositoryManager(self.env)
        repositories = []
        for reponame, repoinfo in all_repositories.iteritems():
            if not reponame or as_bool(repoinfo.get('hidden')):
                continue
            try:
                repos = rm.get_repository(reponame)
                if repos:
                    if not repos.can_view(context.perm):
                        continue
                    try:
                        youngest = repos.get_changeset(repos.youngest_rev)
                    except NoSuchChangeset:
                        youngest = None
                    if self.color_scale and youngest:
                        if not timerange:
                            timerange = TimeRange(youngest.date)
                        else:
                            timerange.insert(youngest.date)
                    raw_href = self._get_download_href(context.href, repos,
                                                       None, None)
                    entry = (reponame, repoinfo, repos, youngest, None,
                             raw_href)
                else:
                    entry = (reponame, repoinfo, None, None, u"\u2013")
            except TracError, err:
                entry = (reponame, repoinfo, None, None,
                         exception_to_unicode(err))
            if entry[-1] is not None:   # Check permission in case of error
                root = Resource('repository', reponame).child('source', '/')
                if 'BROWSER_VIEW' not in context.perm(root):
                    continue
            repositories.append(entry)

        # Ordering of repositories
        if order == 'date':
            def repo_order((reponame, repoinfo, repos, youngest, err)):
                return (youngest and youngest.date or to_datetime(0),
                        embedded_numbers(reponame.lower()))
        elif order == 'author':
            def repo_order((reponame, repoinfo, repos, youngest, err)):
                return (youngest and youngest.author.lower() or '',
                        embedded_numbers(reponame.lower()))
        else:
            def repo_order((reponame, repoinfo, repos, youngest, err)):
                return embedded_numbers(reponame.lower())

        repositories = sorted(repositories, key=repo_order, reverse=desc)

        return {'repositories' : repositories,
                'timerange': timerange, 'colorize_age': custom_colorizer}

    def _render_dir(self, req, repos, node, rev, order, desc):
        req.perm(node.resource).require('BROWSER_VIEW')

        # Entries metadata
        class entry(object):
            __slots__ = 'name rev kind isdir path content_length'.split()
            def __init__(self, node):
                for f in entry.__slots__:
                    setattr(self, f, getattr(node, f))
                
        entries = [entry(n) for n in node.get_entries()
                   if n.can_view(req.perm)]
        changes = get_changes(repos, [i.rev for i in entries], self.log)

        if rev:
            newest = repos.get_changeset(rev).date
        else:
            newest = datetime.now(req.tz)

        # Color scale for the age column
        timerange = custom_colorizer = None
        if self.color_scale:
            timerange = TimeRange(newest)
            max_s = req.args.get('range_max_secs')
            min_s = req.args.get('range_min_secs')
            parent_range = [timerange.from_seconds(long(s))
                            for s in [max_s, min_s] if s]
            this_range = [c.date for c in changes.values() if c]
            for dt in this_range + parent_range:
                timerange.insert(dt)
            custom_colorizer = self.get_custom_colorizer()

        # Ordering of entries
        if order == 'date':
            def file_order(a):
                return (changes[a.rev].date,
                        embedded_numbers(a.name.lower()))
        elif order == 'size':
            def file_order(a):
                return (a.content_length,
                        embedded_numbers(a.name.lower()))
        elif order == 'author':
            def file_order(a):
                return (changes[a.rev].author.lower(),
                        embedded_numbers(a.name.lower()))
        else:
            def file_order(a):
                return embedded_numbers(a.name.lower())

        dir_order = desc and 1 or -1

        def browse_order(a):
            return a.isdir and dir_order or 0, file_order(a)
        entries = sorted(entries, key=browse_order, reverse=desc)

        # ''Zip Archive'' alternate link
        path = node.path.strip('/')
        if repos.reponame:
            path = repos.reponame + '/' + path
        if any(fnmatchcase(path, p.strip('/'))
               for p in self.downloadable_paths):
            zip_href = req.href.changeset(rev or repos.youngest_rev, 
                                          repos.reponame or None, node.path,
                                          old=rev,
                                          old_path=repos.reponame or '/',
                                          format='zip')
            add_link(req, 'alternate', zip_href, _('Zip Archive'),
                     'application/zip', 'zip')

        return {'entries': entries, 'changes': changes,
                'timerange': timerange, 'colorize_age': custom_colorizer,
                'range_max_secs': (timerange and
                                   timerange.to_seconds(timerange.newest)),
                'range_min_secs': (timerange and
                                   timerange.to_seconds(timerange.oldest)),
                }

    def _render_file(self, req, context, repos, node, rev=None):
        req.perm(node.resource).require('FILE_VIEW')

        mimeview = Mimeview(self.env)

        # MIME type detection
        content = node.get_content()
        chunk = content.read(CHUNK_SIZE)
        mime_type = node.content_type
        if not mime_type or mime_type == 'application/octet-stream':
            mime_type = mimeview.get_mimetype(node.name, chunk) or \
                        mime_type or 'text/plain'

        # Eventually send the file directly
        format = req.args.get('format')
        if format in ('raw', 'txt'):
            req.send_response(200)
            req.send_header('Content-Type',
                            format == 'txt' and 'text/plain' or mime_type)
            req.send_header('Content-Length', node.content_length)
            req.send_header('Last-Modified', http_date(node.last_modified))
            if rev is None:
                req.send_header('Pragma', 'no-cache')
                req.send_header('Cache-Control', 'no-cache')
                req.send_header('Expires', 'Fri, 01 Jan 1999 00:00:00 GMT')
            if not self.render_unsafe_content:
                # Force browser to download files instead of rendering
                # them, since they might contain malicious code enabling 
                # XSS attacks
                req.send_header('Content-Disposition', 'attachment')
            req.end_headers()

            while 1:
                if not chunk:
                    raise RequestDone
                req.write(chunk)
                chunk = content.read(CHUNK_SIZE)
        else:
            # The changeset corresponding to the last change on `node` 
            # is more interesting than the `rev` changeset.
            changeset = repos.get_changeset(node.rev)

            # add ''Plain Text'' alternate link if needed
            if not is_binary(chunk) and mime_type != 'text/plain':
                plain_href = req.href.browser(repos.reponame or None,
                                              node.path, rev=rev, format='txt')
                add_link(req, 'alternate', plain_href, _('Plain Text'),
                         'text/plain')

            # add ''Original Format'' alternate link (always)
            raw_href = req.href.export(rev or repos.youngest_rev, 
                                       repos.reponame or None, node.path)
            add_link(req, 'alternate', raw_href, _('Original Format'),
                     mime_type)

            self.log.debug("Rendering preview of node %s@%s with mime-type %s"
                           % (node.name, str(rev), mime_type))

            del content # the remainder of that content is not needed

            add_stylesheet(req, 'common/css/code.css')

            annotations = ['lineno']
            annotate = req.args.get('annotate')
            if annotate:
                annotations.insert(0, annotate)
            preview_data = mimeview.preview_data(context, node.get_content(),
                                                 node.get_content_length(),
                                                 mime_type, node.created_path,
                                                 raw_href,
                                                 annotations=annotations,
                                                 force_source=bool(annotate))
            return {
                'changeset': changeset,
                'size': node.content_length,
                'preview': preview_data,
                'annotate': annotate,
                }

    # public methods
    
    def render_properties(self, mode, context, props):
        """Prepare rendering of a collection of properties."""
        return filter(None, [self.render_property(name, mode, context, props)
                             for name in sorted(props)])

    def render_property(self, name, mode, context, props):
        """Renders a node property to HTML."""
        if name in self.hidden_properties:
            return
        candidates = []
        for renderer in self.property_renderers:
            quality = renderer.match_property(name, mode)
            if quality > 0:
                candidates.append((quality, renderer))
        candidates.sort(reverse=True)
        for (quality, renderer) in candidates:
            try:
                rendered = renderer.render_property(name, mode, context, props)
                if not rendered:
                    return rendered
                if isinstance(rendered, RenderedProperty):
                    value = rendered.content
                else:
                    value = rendered
                    rendered = None
                prop = {'name': name, 'value': value, 'rendered': rendered}
                return prop
            except Exception, e:
                self.log.warning('Rendering failed for property %s with '
                                 'renderer %s: %s', name,
                                 renderer.__class__.__name__,
                                 exception_to_unicode(e, traceback=True))

    # IWikiSyntaxProvider methods

    def get_wiki_syntax(self):
        return []

    def get_link_resolvers(self):
        """TracBrowser link resolvers.
         - `source:` and `browser:`
             * simple paths (/dir/file)
             * paths at a given revision (/dir/file@234)
             * paths with line number marks (/dir/file@234:10,20-30)
             * paths with line number anchor (/dir/file@234#L100)
            Marks and anchor can be combined.
            The revision must be present when specifying line numbers.
            In the few cases where it would be redundant (e.g. for tags), the
            revision number itself can be omitted: /tags/v10/file@100-110#L99
        """
        return [('repos', self._format_browser_link),
                ('export', self._format_export_link),
                ('source', self._format_browser_link),
                ('browser', self._format_browser_link)]

    def _format_export_link(self, formatter, ns, export, label):
        export, query, fragment = formatter.split_link(export)
        if ':' in export:
            rev, path = export.split(':', 1)
        elif '@' in export:
            path, rev = export.split('@', 1)
        else:
            rev, path = 'HEAD', export
        return tag.a(label, class_='export',
                     href=formatter.href.export(rev, path) + fragment)

    def _format_browser_link(self, formatter, ns, path, label):
        path, query, fragment = formatter.split_link(path)
        rev = marks = None
        match = self.PATH_LINK_RE.match(path)
        if match:
            path, rev, marks = match.groups()
        return tag.a(label, class_='source',
                     href=(formatter.href.browser(path, rev=rev, marks=marks) +
                           query + fragment))

    PATH_LINK_RE = re.compile(r"([^@#:]*)"     # path
                              r"[@:]([^#:]+)?" # rev
                              r"(?::(\d+(?:-\d+)?(?:,\d+(?:-\d+)?)*))?" # marks
                              )

    # IHTMLPreviewAnnotator methods

    def get_annotation_type(self):
        return 'blame', _('Rev'), _('Revision in which the line changed')

    def get_annotation_data(self, context):
        """Cache the annotation data corresponding to each revision."""
        return BlameAnnotator(self.env, context)

    def annotate_row(self, context, row, lineno, line, blame_annotator):
        blame_annotator.annotate(row, lineno)

    # IWikiMacroProvider methods

    def get_macros(self):
        yield "RepositoryIndex"

    def get_macro_description(self, name):
        return cleandoc("""
        Display the list of available repositories.

        Can be given the following named arguments:
        
          ''format''::
            Select the rendering format:
            - ''compact'' produces a comma-separated list of repository prefix
              names (default)
            - ''list'' produces a description list of repository prefix names 
            - ''table'' produces a table view, similar to the one visible in
              the ''Browse View'' page
          ''glob''::
            Do a glob-style filtering on the repository names (defaults to '*')
          ''order''::
            Order repositories by the given column (one of "name", "date" or
            "author")
          ''desc''::
            When set to 1, order by descending order

        (''since 0.12'')
        """)

    def expand_macro(self, formatter, name, content):
        args, kwargs = parse_args(content)
        format = kwargs.get('format', 'compact')
        glob = kwargs.get('glob', '*')
        order = kwargs.get('order')
        desc = as_bool(kwargs.get('desc', 0))

        rm = RepositoryManager(self.env)
        all_repos = dict(rdata for rdata in rm.get_all_repositories().items()
                         if fnmatchcase(rdata[0], glob))

        if format == 'table':
            repo = self._render_repository_index(formatter.context, all_repos,
                                                 order, desc)

            add_stylesheet(formatter.req, 'common/css/browser.css')
            wiki_format_messages = self.config['changeset'] \
                                       .getbool('wiki_format_messages')
            data = {'repo': repo, 'order': order, 'desc': desc and 1 or None,
                    'reponame': None, 'path': '/', 'stickyrev': None,
                    'wiki_format_messages': wiki_format_messages}
            from trac.web.chrome import Chrome
            return Chrome(self.env).render_template(
                    formatter.req, 'repository_index.html', data, None,
                    fragment=True)

        def get_repository(reponame):
            try:
                return rm.get_repository(reponame)
            except TracError:
                return

        all_repos = [(reponame, get_repository(reponame))
                     for reponame in all_repos]
        all_repos = sorted(((reponame, repos) for reponame, repos in all_repos
                            if repos
                            and not as_bool(repos.params.get('hidden'))
                            and repos.can_view(formatter.perm)),
                           reverse=desc)

        def repolink(reponame, repos):
            label = reponame or _('(default)')
            return Markup(tag.a(label, 
                          title=_('View repository %(repo)s', repo=label),
                          href=formatter.href.browser(repos.reponame or None)))

        if format == 'list':
            return tag.dl([
                tag(tag.dt(repolink(reponame, repos)),
                    tag.dd(repos.params.get('description')))
                for reponame, repos in all_repos])
        else: # compact
            return Markup(', ').join([repolink(reponame, repos)
                                      for reponame, repos in all_repos])

        

class BlameAnnotator(object):

    def __init__(self, env, context):
        self.env = env
        self.context = context
        rm = RepositoryManager(self.env)
        self.repos = rm.get_repository(context.resource.parent.id)
        self.path = context.resource.id
        self.rev = context.resource.version
        # maintain state
        self.prev_chgset = None
        self.chgset_data = {}
        add_script(context.req, 'common/js/blame.js')
        add_stylesheet(context.req, 'common/css/changeset.css')
        add_stylesheet(context.req, 'common/css/diff.css')
        self.reset()

    def reset(self):
        rev = self.rev
        node = self.repos.get_node(self.path, rev)
        # FIXME: get_annotations() should be in the Resource API
        # -- get revision numbers for each line
        self.annotations = node.get_annotations()
        # -- from the annotations, retrieve changesets and
        # determine the span of dates covered, for the color code.
        # Note: changesets[i].rev can differ from annotations[i]
        # (long form vs. compact, short rev form for the latter).
        self.changesets = []
        chgset = self.repos.get_changeset(rev)
        chgsets = {rev: chgset}
        self.timerange = TimeRange(chgset.date)
        for idx in range(len(self.annotations)):
            rev = self.annotations[idx]
            chgset = chgsets.get(rev)
            if not chgset:
                chgset = self.repos.get_changeset(rev)
                chgsets[rev] = chgset
                self.timerange.insert(chgset.date)
            # get list of changeset parallel to annotations
            self.changesets.append(chgset)
        # -- retrieve the original path of the source, for each rev
        # (support for copy/renames)
        self.paths = {}
        for path, rev, chg in node.get_history():
            self.paths[rev] = path
        # -- get custom colorize function
        browser = BrowserModule(self.env)
        self.colorize_age = browser.get_custom_colorizer()

    def annotate(self, row, lineno):
        if lineno > len(self.annotations):
            row.append(tag.th())
            return
        rev = self.annotations[lineno-1]
        chgset = self.changesets[lineno-1]
        path = self.paths.get(rev, None)
        # Note: path will be None if copy/rename is not supported
        # by get_history
        
        # -- compute anchor and style once per revision
        if rev not in self.chgset_data:
            chgset_href = \
                self.context.href.changeset(rev, self.repos.reponame or None,
                                            path)
            short_author = chgset.author.split(' ', 1)[0]
            title = shorten_line('%s: %s' % (short_author, chgset.message))
            anchor = tag.a('[%s]' % self.repos.short_rev(rev), # shortname
                           title=title, href=chgset_href)
            color = self.colorize_age(self.timerange.relative(chgset.date))
            style = 'background-color: rgb(%d, %d, %d);' % color
            self.chgset_data[rev] = (anchor, style)
        else:
            anchor, style = self.chgset_data[rev]

        if self.prev_chgset != chgset:
            self.prev_style = style
        # optimize away the path if there's no copy/rename info
        if not path or path == self.path:
            path = ''
        # -- produce blame column, eventually with an anchor
        style = self.prev_style
        if lineno < len(self.changesets) and self.changesets[lineno] == chgset:
            style += ' border-bottom: none;'
        blame_col = tag.th(style=style, class_='blame r%s' % rev)
        if self.prev_chgset != chgset:
            blame_col.append(anchor)
            self.prev_chgset = chgset
        row.append(blame_col)