~bzr-pqm/bzr/bzr.dev

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
# Copyright (C) 2005-2011 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA


"""Commit message editor support."""

import codecs
import os
from subprocess import call
import sys

from bzrlib import (
    cmdline,
    config,
    osutils,
    trace,
    transport,
    ui,
    )
from bzrlib.errors import BzrError, BadCommitMessageEncoding
from bzrlib.hooks import Hooks


def _get_editor():
    """Return a sequence of possible editor binaries for the current platform"""
    try:
        yield os.environ["BZR_EDITOR"], '$BZR_EDITOR'
    except KeyError:
        pass

    e = config.GlobalStack().get('editor')
    if e is not None:
        yield e, config.config_filename()

    for varname in 'VISUAL', 'EDITOR':
        if varname in os.environ:
            yield os.environ[varname], '$' + varname

    if sys.platform == 'win32':
        for editor in 'wordpad.exe', 'notepad.exe':
            yield editor, None
    else:
        for editor in ['/usr/bin/editor', 'vi', 'pico', 'nano', 'joe']:
            yield editor, None


def _run_editor(filename):
    """Try to execute an editor to edit the commit message."""
    for candidate, candidate_source in _get_editor():
        edargs = cmdline.split(candidate)
        try:
            ## mutter("trying editor: %r", (edargs +[filename]))
            x = call(edargs + [filename])
        except OSError, e:
            if candidate_source is not None:
                # We tried this editor because some user configuration (an
                # environment variable or config file) said to try it.  Let
                # the user know their configuration is broken.
                trace.warning(
                    'Could not start editor "%s" (specified by %s): %s\n'
                    % (candidate, candidate_source, str(e)))
            continue
            raise
        if x == 0:
            return True
        elif x == 127:
            continue
        else:
            break
    raise BzrError("Could not start any editor.\nPlease specify one with:\n"
                   " - $BZR_EDITOR\n - editor=/some/path in %s\n"
                   " - $VISUAL\n - $EDITOR" % \
                    config.config_filename())


DEFAULT_IGNORE_LINE = "%(bar)s %(msg)s %(bar)s" % \
    { 'bar' : '-' * 14, 'msg' : 'This line and the following will be ignored' }


def edit_commit_message(infotext, ignoreline=DEFAULT_IGNORE_LINE,
                        start_message=None):
    """Let the user edit a commit message in a temp file.

    This is run if they don't give a message or
    message-containing file on the command line.

    :param infotext:    Text to be displayed at bottom of message
                        for the user's reference;
                        currently similar to 'bzr status'.

    :param ignoreline:  The separator to use above the infotext.

    :param start_message:   The text to place above the separator, if any.
                            This will not be removed from the message
                            after the user has edited it.

    :return:    commit message or None.
    """

    if not start_message is None:
        start_message = start_message.encode(osutils.get_user_encoding())
    infotext = infotext.encode(osutils.get_user_encoding(), 'replace')
    return edit_commit_message_encoded(infotext, ignoreline, start_message)


def edit_commit_message_encoded(infotext, ignoreline=DEFAULT_IGNORE_LINE,
                                start_message=None):
    """Let the user edit a commit message in a temp file.

    This is run if they don't give a message or
    message-containing file on the command line.

    :param infotext:    Text to be displayed at bottom of message
                        for the user's reference;
                        currently similar to 'bzr status'.
                        The string is already encoded

    :param ignoreline:  The separator to use above the infotext.

    :param start_message:   The text to place above the separator, if any.
                            This will not be removed from the message
                            after the user has edited it.
                            The string is already encoded

    :return:    commit message or None.
    """
    msgfilename = None
    try:
        msgfilename, hasinfo = _create_temp_file_with_commit_template(
                                    infotext, ignoreline, start_message)
        if not msgfilename:
            return None
        basename = osutils.basename(msgfilename)
        msg_transport = transport.get_transport(osutils.dirname(msgfilename))
        reference_content = msg_transport.get_bytes(basename)
        if not _run_editor(msgfilename):
            return None
        edited_content = msg_transport.get_bytes(basename)
        if edited_content == reference_content:
            if not ui.ui_factory.confirm_action(
                u"Commit message was not edited, use anyway",
                "bzrlib.msgeditor.unchanged",
                {}):
                # Returning "" makes cmd_commit raise 'empty commit message
                # specified' which is a reasonable error, given the user has
                # rejected using the unedited template.
                return ""
        started = False
        msg = []
        lastline, nlines = 0, 0
        # codecs.open() ALWAYS opens file in binary mode but we need text mode
        # 'rU' mode useful when bzr.exe used on Cygwin (bialix 20070430)
        f = file(msgfilename, 'rU')
        try:
            try:
                for line in codecs.getreader(osutils.get_user_encoding())(f):
                    stripped_line = line.strip()
                    # strip empty line before the log message starts
                    if not started:
                        if stripped_line != "":
                            started = True
                        else:
                            continue
                    # check for the ignore line only if there
                    # is additional information at the end
                    if hasinfo and stripped_line == ignoreline:
                        break
                    nlines += 1
                    # keep track of the last line that had some content
                    if stripped_line != "":
                        lastline = nlines
                    msg.append(line)
            except UnicodeDecodeError:
                raise BadCommitMessageEncoding()
        finally:
            f.close()

        if len(msg) == 0:
            return ""
        # delete empty lines at the end
        del msg[lastline:]
        # add a newline at the end, if needed
        if not msg[-1].endswith("\n"):
            return "%s%s" % ("".join(msg), "\n")
        else:
            return "".join(msg)
    finally:
        # delete the msg file in any case
        if msgfilename is not None:
            try:
                os.unlink(msgfilename)
            except IOError, e:
                trace.warning(
                    "failed to unlink %s: %s; ignored", msgfilename, e)


def _create_temp_file_with_commit_template(infotext,
                                           ignoreline=DEFAULT_IGNORE_LINE,
                                           start_message=None,
                                           tmpdir=None):
    """Create temp file and write commit template in it.

    :param infotext: Text to be displayed at bottom of message for the
        user's reference; currently similar to 'bzr status'.  The text is
        already encoded.

    :param ignoreline:  The separator to use above the infotext.

    :param start_message: The text to place above the separator, if any.
        This will not be removed from the message after the user has edited
        it.  The string is already encoded

    :return:    2-tuple (temp file name, hasinfo)
    """
    import tempfile
    tmp_fileno, msgfilename = tempfile.mkstemp(prefix='bzr_log.',
                                               dir=tmpdir, text=True)
    msgfile = os.fdopen(tmp_fileno, 'w')
    try:
        if start_message is not None:
            msgfile.write("%s\n" % start_message)

        if infotext is not None and infotext != "":
            hasinfo = True
            msgfile.write("\n\n%s\n\n%s" %(ignoreline, infotext))
        else:
            hasinfo = False
    finally:
        msgfile.close()

    return (msgfilename, hasinfo)


def make_commit_message_template(working_tree, specific_files):
    """Prepare a template file for a commit into a branch.

    Returns a unicode string containing the template.
    """
    # TODO: make provision for this to be overridden or modified by a hook
    #
    # TODO: Rather than running the status command, should prepare a draft of
    # the revision to be committed, then pause and ask the user to
    # confirm/write a message.
    from StringIO import StringIO       # must be unicode-safe
    from bzrlib.status import show_tree_status
    status_tmp = StringIO()
    show_tree_status(working_tree, specific_files=specific_files,
                     to_file=status_tmp, verbose=True)
    return status_tmp.getvalue()


def make_commit_message_template_encoded(working_tree, specific_files,
                                         diff=None, output_encoding='utf-8'):
    """Prepare a template file for a commit into a branch.

    Returns an encoded string.
    """
    # TODO: make provision for this to be overridden or modified by a hook
    #
    # TODO: Rather than running the status command, should prepare a draft of
    # the revision to be committed, then pause and ask the user to
    # confirm/write a message.
    from StringIO import StringIO       # must be unicode-safe
    from bzrlib.diff import show_diff_trees

    template = make_commit_message_template(working_tree, specific_files)
    template = template.encode(output_encoding, "replace")

    if diff:
        stream = StringIO()
        show_diff_trees(working_tree.basis_tree(),
                        working_tree, stream, specific_files,
                        path_encoding=output_encoding)
        template = template + '\n' + stream.getvalue()

    return template


class MessageEditorHooks(Hooks):
    """A dictionary mapping hook name to a list of callables for message editor
    hooks.

    e.g. ['commit_message_template'] is the list of items to be called to
    generate a commit message template
    """

    def __init__(self):
        """Create the default hooks.

        These are all empty initially.
        """
        Hooks.__init__(self, "bzrlib.msgeditor", "hooks")
        self.add_hook('set_commit_message',
            "Set a fixed commit message. "
            "set_commit_message is called with the "
            "bzrlib.commit.Commit object (so you can also change e.g. revision "
            "properties by editing commit.builder._revprops) and the message "
            "so far. set_commit_message must return the message to use or None"
            " if it should use the message editor as normal.", (2, 4))
        self.add_hook('commit_message_template',
            "Called when a commit message is being generated. "
            "commit_message_template is called with the bzrlib.commit.Commit "
            "object and the message that is known so far. "
            "commit_message_template must return a new message to use (which "
            "could be the same as it was given). When there are multiple "
            "hooks registered for commit_message_template, they are chained "
            "with the result from the first passed into the second, and so "
            "on.", (1, 10))


hooks = MessageEditorHooks()


def set_commit_message(commit, start_message=None):
    """Sets the commit message.
    :param commit: Commit object for the active commit.
    :return: The commit message or None to continue using the message editor
    """
    start_message = None
    for hook in hooks['set_commit_message']:
        start_message = hook(commit, start_message)
    return start_message


def generate_commit_message_template(commit, start_message=None):
    """Generate a commit message template.

    :param commit: Commit object for the active commit.
    :param start_message: Message to start with.
    :return: A start commit message or None for an empty start commit message.
    """
    start_message = None
    for hook in hooks['commit_message_template']:
        start_message = hook(commit, start_message)
    return start_message