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Use FETCH_HEAD to know where to rebase to after pull.
[stgit] / stgit / commands / common.py
1 """Function/variables common to all the commands
2 """
3
4 __copyright__ = """
5 Copyright (C) 2005, Catalin Marinas <catalin.marinas@gmail.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 """
20
21 import sys, os, os.path, re
22 from optparse import OptionParser, make_option
23
24 from stgit.utils import *
25 from stgit import stack, git, basedir
26 from stgit.config import config, file_extensions
27
28 crt_series = None
29
30
31 # Command exception class
32 class CmdException(Exception):
33     pass
34
35
36 # Utility functions
37 class RevParseException(Exception):
38     """Revision spec parse error."""
39     pass
40
41 def parse_rev(rev):
42     """Parse a revision specification into its
43     patchname@branchname//patch_id parts. If no branch name has a slash
44     in it, also accept / instead of //."""
45     files, dirs = list_files_and_dirs(os.path.join(basedir.get(),
46                                                    'refs', 'heads'))
47     if len(dirs) != 0:
48         # We have branch names with / in them.
49         branch_chars = r'[^@]'
50         patch_id_mark = r'//'
51     else:
52         # No / in branch names.
53         branch_chars = r'[^@/]'
54         patch_id_mark = r'(/|//)'
55     patch_re = r'(?P<patch>[^@/]+)'
56     branch_re = r'@(?P<branch>%s+)' % branch_chars
57     patch_id_re = r'%s(?P<patch_id>[a-z.]*)' % patch_id_mark
58
59     # Try //patch_id.
60     m = re.match(r'^%s$' % patch_id_re, rev)
61     if m:
62         return None, None, m.group('patch_id')
63
64     # Try path[@branch]//patch_id.
65     m = re.match(r'^%s(%s)?%s$' % (patch_re, branch_re, patch_id_re), rev)
66     if m:
67         return m.group('patch'), m.group('branch'), m.group('patch_id')
68
69     # Try patch[@branch].
70     m = re.match(r'^%s(%s)?$' % (patch_re, branch_re), rev)
71     if m:
72         return m.group('patch'), m.group('branch'), None
73
74     # No, we can't parse that.
75     raise RevParseException
76
77 def git_id(rev):
78     """Return the GIT id
79     """
80     if not rev:
81         return None
82     try:
83         patch, branch, patch_id = parse_rev(rev)
84         if branch == None:
85             series = crt_series
86         else:
87             series = stack.Series(branch)
88         if patch == None:
89             patch = series.get_current()
90             if not patch:
91                 raise CmdException, 'No patches applied'
92         if patch in series.get_applied() or patch in series.get_unapplied():
93             if patch_id in ['top', '', None]:
94                 return series.get_patch(patch).get_top()
95             elif patch_id == 'bottom':
96                 return series.get_patch(patch).get_bottom()
97             elif patch_id == 'top.old':
98                 return series.get_patch(patch).get_old_top()
99             elif patch_id == 'bottom.old':
100                 return series.get_patch(patch).get_old_bottom()
101             elif patch_id == 'log':
102                 return series.get_patch(patch).get_log()
103         if patch == 'base' and patch_id == None:
104             return read_string(series.get_base_file())
105     except RevParseException:
106         pass
107     return git.rev_parse(rev + '^{commit}')
108
109 def check_local_changes():
110     if git.local_changes():
111         raise CmdException, \
112               'local changes in the tree. Use "refresh" or "status --reset"'
113
114 def check_head_top_equal():
115     if not crt_series.head_top_equal():
116         raise CmdException(
117             'HEAD and top are not the same. You probably committed\n'
118             '  changes to the tree outside of StGIT. To bring them\n'
119             '  into StGIT, use the "assimilate" command')
120
121 def check_conflicts():
122     if os.path.exists(os.path.join(basedir.get(), 'conflicts')):
123         raise CmdException, \
124               'Unsolved conflicts. Please resolve them first or\n' \
125               '  revert the changes with "status --reset"'
126
127 def print_crt_patch(branch = None):
128     if not branch:
129         patch = crt_series.get_current()
130     else:
131         patch = stack.Series(branch).get_current()
132
133     if patch:
134         print 'Now at patch "%s"' % patch
135     else:
136         print 'No patches applied'
137
138 def resolved(filename, reset = None):
139     if reset:
140         reset_file = filename + file_extensions()[reset]
141         if os.path.isfile(reset_file):
142             if os.path.isfile(filename):
143                 os.remove(filename)
144             os.rename(reset_file, filename)
145
146     git.update_cache([filename], force = True)
147
148     for ext in file_extensions().values():
149         fn = filename + ext
150         if os.path.isfile(fn):
151             os.remove(fn)
152
153 def resolved_all(reset = None):
154     conflicts = git.get_conflicts()
155     if conflicts:
156         for filename in conflicts:
157             resolved(filename, reset)
158         os.remove(os.path.join(basedir.get(), 'conflicts'))
159
160 def push_patches(patches, check_merged = False):
161     """Push multiple patches onto the stack. This function is shared
162     between the push and pull commands
163     """
164     forwarded = crt_series.forward_patches(patches)
165     if forwarded > 1:
166         print 'Fast-forwarded patches "%s" - "%s"' % (patches[0],
167                                                       patches[forwarded - 1])
168     elif forwarded == 1:
169         print 'Fast-forwarded patch "%s"' % patches[0]
170
171     names = patches[forwarded:]
172
173     # check for patches merged upstream
174     if check_merged:
175         print 'Checking for patches merged upstream...',
176         sys.stdout.flush()
177
178         merged = crt_series.merged_patches(names)
179
180         print 'done (%d found)' % len(merged)
181     else:
182         merged = []
183
184     for p in names:
185         print 'Pushing patch "%s"...' % p,
186         sys.stdout.flush()
187
188         if p in merged:
189             crt_series.push_patch(p, empty = True)
190             print 'done (merged upstream)'
191         else:
192             modified = crt_series.push_patch(p)
193
194             if crt_series.empty_patch(p):
195                 print 'done (empty patch)'
196             elif modified:
197                 print 'done (modified)'
198             else:
199                 print 'done'
200
201 def pop_patches(patches, keep = False):
202     """Pop the patches in the list from the stack. It is assumed that
203     the patches are listed in the stack reverse order.
204     """
205     if len(patches) == 0:
206         print 'nothing to push/pop'
207     else:
208         p = patches[-1]
209         if len(patches) == 1:
210             print 'Popping patch "%s"...' % p,
211         else:
212             print 'Popping "%s" - "%s" patches...' % (patches[0], p),
213         sys.stdout.flush()
214
215         crt_series.pop_patch(p, keep)
216
217         print 'done'
218
219 def parse_patches(patch_args, patch_list, boundary = 0, ordered = False):
220     """Parse patch_args list for patch names in patch_list and return
221     a list. The names can be individual patches and/or in the
222     patch1..patch2 format.
223     """
224     patches = []
225
226     for name in patch_args:
227         pair = name.split('..')
228         for p in pair:
229             if p and not p in patch_list:
230                 raise CmdException, 'Unknown patch name: %s' % p
231
232         if len(pair) == 1:
233             # single patch name
234             pl = pair
235         elif len(pair) == 2:
236             # patch range [p1]..[p2]
237             # inclusive boundary
238             if pair[0]:
239                 first = patch_list.index(pair[0])
240             else:
241                 first = -1
242             # exclusive boundary
243             if pair[1]:
244                 last = patch_list.index(pair[1]) + 1
245             else:
246                 last = -1
247
248             # only cross the boundary if explicitly asked
249             if not boundary:
250                 boundary = len(patch_list)
251             if first < 0:
252                 if last <= boundary:
253                     first = 0
254                 else:
255                     first = boundary
256             if last < 0:
257                 if first < boundary:
258                     last = boundary
259                 else:
260                     last = len(patch_list)
261
262             if last > first:
263                 pl = patch_list[first:last]
264             else:
265                 pl = patch_list[(last - 1):(first + 1)]
266                 pl.reverse()
267         else:
268             raise CmdException, 'Malformed patch name: %s' % name
269
270         for p in pl:
271             if p in patches:
272                 raise CmdException, 'Duplicate patch name: %s' % p
273
274         patches += pl
275
276     if ordered:
277         patches = [p for p in patch_list if p in patches]
278
279     return patches
280
281 def name_email(address):
282     """Return a tuple consisting of the name and email parsed from a
283     standard 'name <email>' or 'email (name)' string
284     """
285     address = re.sub('[\\\\"]', '\\\\\g<0>', address)
286     str_list = re.findall('^(.*)\s*<(.*)>\s*$', address)
287     if not str_list:
288         str_list = re.findall('^(.*)\s*\((.*)\)\s*$', address)
289         if not str_list:
290             raise CmdException, 'Incorrect "name <email>"/"email (name)" string: %s' % address
291         return ( str_list[0][1], str_list[0][0] )
292
293     return str_list[0]
294
295 def name_email_date(address):
296     """Return a tuple consisting of the name, email and date parsed
297     from a 'name <email> date' string
298     """
299     address = re.sub('[\\\\"]', '\\\\\g<0>', address)
300     str_list = re.findall('^(.*)\s*<(.*)>\s*(.*)\s*$', address)
301     if not str_list:
302         raise CmdException, 'Incorrect "name <email> date" string: %s' % address
303
304     return str_list[0]
305
306 def address_or_alias(addr_str):
307     """Return the address if it contains an e-mail address or look up
308     the aliases in the config files.
309     """
310     def __address_or_alias(addr):
311         if addr.find('@') >= 0:
312             # it's an e-mail address
313             return addr
314         alias = config.get('mail.alias.'+addr)
315         if alias:
316             # it's an alias
317             return alias
318
319         raise CmdException, 'unknown e-mail alias: %s' % addr
320
321     addr_list = [__address_or_alias(addr.strip())
322                  for addr in addr_str.split(',')]
323     return ', '.join(addr_list)
324
325 def patch_name_from_msg(msg):
326     """Return a string to be used as a patch name. This is generated
327     from the first 30 characters of the top line of the string passed
328     as argument."""
329     if not msg:
330         return None
331
332     subject_line = msg[:30].lstrip().split('\n', 1)[0].lower()
333     return re.sub('[\W]+', '-', subject_line).strip('-')
334
335 def make_patch_name(msg, unacceptable, default_name = 'patch',
336                     alternative = True):
337     """Return a patch name generated from the given commit message,
338     guaranteed to make unacceptable(name) be false. If the commit
339     message is empty, base the name on default_name instead."""
340     patchname = patch_name_from_msg(msg)
341     if not patchname:
342         patchname = default_name
343     if alternative and unacceptable(patchname):
344         suffix = 0
345         while unacceptable('%s-%d' % (patchname, suffix)):
346             suffix += 1
347         patchname = '%s-%d' % (patchname, suffix)
348     return patchname