File: changelog.py

package info (click to toggle)
logilab-common 0.58.0-1
  • links: PTS, VCS
  • area: main
  • in suites: wheezy
  • size: 1,132 kB
  • sloc: python: 11,407; makefile: 57; sh: 11
file content (236 lines) | stat: -rw-r--r-- 8,041 bytes parent folder | download | duplicates (3)
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
# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of logilab-common.
#
# logilab-common is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option) any
# later version.
#
# logilab-common 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with logilab-common.  If not, see <http://www.gnu.org/licenses/>.
"""Manipulation of upstream change log files.

The upstream change log files format handled is simpler than the one
often used such as those generated by the default Emacs changelog mode.

Sample ChangeLog format::

  Change log for project Yoo
  ==========================

   --
      * add a new functionality

  2002-02-01 -- 0.1.1
      * fix bug #435454
      * fix bug #434356

  2002-01-01 -- 0.1
      * initial release


There is 3 entries in this change log, one for each released version and one
for the next version (i.e. the current entry).
Each entry contains a set of messages corresponding to changes done in this
release.
All the non empty lines before the first entry are considered as the change
log title.
"""

__docformat__ = "restructuredtext en"

import sys
from stat import S_IWRITE

BULLET = '*'
SUBBULLET = '-'
INDENT = ' ' * 4

class NoEntry(Exception):
    """raised when we are unable to find an entry"""

class EntryNotFound(Exception):
    """raised when we are unable to find a given entry"""

class Version(tuple):
    """simple class to handle soft version number has a tuple while
    correctly printing it as X.Y.Z
    """
    def __new__(cls, versionstr):
        if isinstance(versionstr, basestring):
            versionstr = versionstr.strip(' :') # XXX (syt) duh?
            parsed = cls.parse(versionstr)
        else:
            parsed = versionstr
        return tuple.__new__(cls, parsed)

    @classmethod
    def parse(cls, versionstr):
        versionstr = versionstr.strip(' :')
        try:
            return [int(i) for i in versionstr.split('.')]
        except ValueError, ex:
            raise ValueError("invalid literal for version '%s' (%s)"%(versionstr, ex))

    def __str__(self):
        return '.'.join([str(i) for i in self])

# upstream change log #########################################################

class ChangeLogEntry(object):
    """a change log entry, i.e. a set of messages associated to a version and
    its release date
    """
    version_class = Version

    def __init__(self, date=None, version=None, **kwargs):
        self.__dict__.update(kwargs)
        if version:
            self.version = self.version_class(version)
        else:
            self.version = None
        self.date = date
        self.messages = []

    def add_message(self, msg):
        """add a new message"""
        self.messages.append(([msg], []))

    def complete_latest_message(self, msg_suite):
        """complete the latest added message
        """
        if not self.messages:
            raise ValueError('unable to complete last message as there is no previous message)')
        if self.messages[-1][1]: # sub messages
            self.messages[-1][1][-1].append(msg_suite)
        else: # message
            self.messages[-1][0].append(msg_suite)

    def add_sub_message(self, sub_msg, key=None):
        if not self.messages:
            raise ValueError('unable to complete last message as there is no previous message)')
        if key is None:
            self.messages[-1][1].append([sub_msg])
        else:
            raise NotImplementedError("sub message to specific key are not implemented yet")

    def write(self, stream=sys.stdout):
        """write the entry to file """
        stream.write('%s  --  %s\n' % (self.date or '', self.version or ''))
        for msg, sub_msgs in self.messages:
            stream.write('%s%s %s\n' % (INDENT, BULLET, msg[0]))
            stream.write(''.join(msg[1:]))
            if sub_msgs:
                stream.write('\n')
            for sub_msg in sub_msgs:
                stream.write('%s%s %s\n' % (INDENT * 2, SUBBULLET, sub_msg[0]))
                stream.write(''.join(sub_msg[1:]))
            stream.write('\n')

        stream.write('\n\n')

class ChangeLog(object):
    """object representation of a whole ChangeLog file"""

    entry_class = ChangeLogEntry

    def __init__(self, changelog_file, title=''):
        self.file = changelog_file
        self.title = title
        self.additional_content = ''
        self.entries = []
        self.load()

    def __repr__(self):
        return '<ChangeLog %s at %s (%s entries)>' % (self.file, id(self),
                                                      len(self.entries))

    def add_entry(self, entry):
        """add a new entry to the change log"""
        self.entries.append(entry)

    def get_entry(self, version='', create=None):
        """ return a given changelog entry
        if version is omitted, return the current entry
        """
        if not self.entries:
            if version or not create:
                raise NoEntry()
            self.entries.append(self.entry_class())
        if not version:
            if self.entries[0].version and create is not None:
                self.entries.insert(0, self.entry_class())
            return self.entries[0]
        version = self.version_class(version)
        for entry in self.entries:
            if entry.version == version:
                return entry
        raise EntryNotFound()

    def add(self, msg, create=None):
        """add a new message to the latest opened entry"""
        entry = self.get_entry(create=create)
        entry.add_message(msg)

    def load(self):
        """ read a logilab's ChangeLog from file """
        try:
            stream = open(self.file)
        except IOError:
            return
        last = None
        expect_sub = False
        for line in stream.readlines():
            sline = line.strip()
            words = sline.split()
            # if new entry
            if len(words) == 1 and words[0] == '--':
                expect_sub = False
                last = self.entry_class()
                self.add_entry(last)
            # if old entry
            elif len(words) == 3 and words[1] == '--':
                expect_sub = False
                last = self.entry_class(words[0], words[2])
                self.add_entry(last)
            # if title
            elif sline and last is None:
                self.title = '%s%s' % (self.title, line)
            # if new entry
            elif sline and sline[0] == BULLET:
                expect_sub = False
                last.add_message(sline[1:].strip())
            # if new sub_entry
            elif expect_sub and sline and sline[0] == SUBBULLET:
                last.add_sub_message(sline[1:].strip())
            # if new line for current entry
            elif sline and last.messages:
                last.complete_latest_message(line)
            else:
                expect_sub = True
                self.additional_content += line
        stream.close()

    def format_title(self):
        return '%s\n\n' % self.title.strip()

    def save(self):
        """write back change log"""
        # filetutils isn't importable in appengine, so import locally
        from logilab.common.fileutils import ensure_fs_mode
        ensure_fs_mode(self.file, S_IWRITE)
        self.write(open(self.file, 'w'))

    def write(self, stream=sys.stdout):
        """write changelog to stream"""
        stream.write(self.format_title())
        for entry in self.entries:
            entry.write(stream)