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# Copyright (C) 2009-2010 Gianluca Montecchi <gian@grys.it>
# W. Trevor King <wking@drexel.edu>
#
# 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.
"""
Darcs backend.
"""
import codecs
import os
import re
import shutil
import sys
import time # work around http://mercurial.selenic.com/bts/issue618
try: # import core module, Python >= 2.5
from xml.etree import ElementTree
except ImportError: # look for non-core module
from elementtree import ElementTree
from xml.sax.saxutils import unescape
import libbe
import base
if libbe.TESTING == True:
import doctest
import unittest
def new():
return Darcs()
class Darcs(base.VCS):
name='darcs'
client='darcs'
def __init__(self, *args, **kwargs):
base.VCS.__init__(self, *args, **kwargs)
self.versioned = True
self.__updated = [] # work around http://mercurial.selenic.com/bts/issue618
def _vcs_version(self):
status,output,error = self._u_invoke_client('--version')
return output.rstrip('\n')
def version_cmp(self, *args):
"""
Compare the installed darcs version V_i with another version
V_o (given in *args). Returns
1 if V_i > V_o,
0 if V_i == V_o, and
-1 if V_i < V_o
>>> d = Darcs(repo='.')
>>> d._vcs_version = lambda : "2.3.1 (release)"
>>> d.version_cmp(2,3,1)
0
>>> d.version_cmp(2,3,2)
-1
>>> d.version_cmp(2,3,0)
1
>>> d.version_cmp(3)
-1
>>> d._vcs_version = lambda : "2.0.0pre2"
>>> d._parsed_version = None
>>> d.version_cmp(3)
Traceback (most recent call last):
...
NotImplementedError: Cannot parse "2.0.0pre2" portion of Darcs version "2.0.0pre2"
invalid literal for int() with base 10: '0pre2'
"""
if not hasattr(self, '_parsed_version') \
or self._parsed_version == None:
num_part = self._vcs_version().split(' ')[0]
try:
self._parsed_version = [int(i) for i in num_part.split('.')]
except ValueError, e:
raise NotImplementedError(
'Cannot parse "%s" portion of Darcs version "%s"\n %s'
% (num_part, self._vcs_version(), str(e)))
cmps = [cmp(a,b) for a,b in zip(self._parsed_version, args)]
for c in cmps:
if c != 0:
return c
return 0
def _vcs_get_user_id(self):
# following http://darcs.net/manual/node4.html#SECTION00410030000000000000
# as of June 29th, 2009
if self.repo == None:
return None
darcs_dir = os.path.join(self.repo, '_darcs')
if darcs_dir != None:
for pref_file in ['author', 'email']:
pref_path = os.path.join(darcs_dir, 'prefs', pref_file)
if os.path.exists(pref_path):
return self.get_file_contents(pref_path)
for env_variable in ['DARCS_EMAIL', 'EMAIL']:
if env_variable in os.environ:
return os.environ[env_variable]
return None
def _vcs_detect(self, path):
if self._u_search_parent_directories(path, "_darcs") != None :
return True
return False
def _vcs_root(self, path):
"""Find the root of the deepest repository containing path."""
# Assume that nothing funny is going on; in particular, that we aren't
# dealing with a bare repo.
if os.path.isdir(path) != True:
path = os.path.dirname(path)
darcs_dir = self._u_search_parent_directories(path, '_darcs')
if darcs_dir == None:
return None
return os.path.dirname(darcs_dir)
def _vcs_init(self, path):
self._u_invoke_client('init', cwd=path)
def _vcs_destroy(self):
vcs_dir = os.path.join(self.repo, '_darcs')
if os.path.exists(vcs_dir):
shutil.rmtree(vcs_dir)
def _vcs_add(self, path):
if os.path.isdir(path):
return
self._u_invoke_client('add', path)
def _vcs_remove(self, path):
if not os.path.isdir(self._u_abspath(path)):
os.remove(os.path.join(self.repo, path)) # darcs notices removal
def _vcs_update(self, path):
self.__updated.append(path) # work around http://mercurial.selenic.com/bts/issue618
pass # darcs notices changes
def _vcs_get_file_contents(self, path, revision=None):
if revision == None:
return base.VCS._vcs_get_file_contents(self, path, revision)
if self.version_cmp(2, 0, 0) == 1:
status,output,error = self._u_invoke_client( \
'show', 'contents', '--patch', revision, path)
return output
# Darcs versions < 2.0.0pre2 lack the 'show contents' command
status,output,error = self._u_invoke_client( \
'diff', '--unified', '--from-patch', revision, path,
unicode_output=False)
major_patch = output
status,output,error = self._u_invoke_client( \
'diff', '--unified', '--patch', revision, path,
unicode_output=False)
target_patch = output
# '--output -' to be supported in GNU patch > 2.5.9
# but that hasn't been released as of June 30th, 2009.
# Rewrite path to status before the patch we want
args=['patch', '--reverse', path]
status,output,error = self._u_invoke(args, stdin=major_patch)
# Now apply the patch we want
args=['patch', path]
status,output,error = self._u_invoke(args, stdin=target_patch)
if os.path.exists(os.path.join(self.repo, path)) == True:
contents = base.VCS._vcs_get_file_contents(self, path)
else:
contents = ''
# Now restore path to it's current incarnation
args=['patch', '--reverse', path]
status,output,error = self._u_invoke(args, stdin=target_patch)
args=['patch', path]
status,output,error = self._u_invoke(args, stdin=major_patch)
current_contents = base.VCS._vcs_get_file_contents(self, path)
return contents
def _vcs_path(self, id, revision):
return self._u_find_id(id, revision)
def _vcs_isdir(self, path, revision):
if self.version_cmp(2, 3, 1) == 1:
# Sun Nov 15 20:32:06 EST 2009 thomashartman1@gmail.com
# * add versioned show files functionality (darcs show files -p 'some patch')
status,output,error = self._u_invoke_client( \
'show', 'files', '--no-files', '--patch', revision)
children = output.rstrip('\n').splitlines()
rpath = '.'
children = [self._u_rel_path(c, rpath) for c in children]
if path in children:
return True
return False
# Darcs versions <= 2.3.1 lack the --patch option for 'show files'
raise NotImplementedError
def _vcs_listdir(self, path, revision):
if self.version_cmp(2, 3, 1) == 1:
# Sun Nov 15 20:32:06 EST 2009 thomashartman1@gmail.com
# * add versioned show files functionality (darcs show files -p 'some patch')
# Wed Dec 9 05:42:21 EST 2009 Luca Molteni <volothamp@gmail.com>
# * resolve issue835 show file with file directory arguments
path = path.rstrip(os.path.sep)
status,output,error = self._u_invoke_client( \
'show', 'files', '--patch', revision, path)
files = output.rstrip('\n').splitlines()
if path == '.':
descendents = [self._u_rel_path(f, path) for f in files
if f != '.']
else:
descendents = [self._u_rel_path(f, path) for f in files
if f.startswith(path)]
return [f for f in descendents if f.count(os.path.sep) == 0]
# Darcs versions <= 2.3.1 lack the --patch option for 'show files'
raise NotImplementedError
def _vcs_commit(self, commitfile, allow_empty=False):
id = self.get_user_id()
if id == None or '@' not in id:
id = '%s <%s@invalid.com>' % (id, id)
args = ['record', '--all', '--author', id, '--logfile', commitfile]
status,output,error = self._u_invoke_client(*args)
empty_strings = ['No changes!']
# work around http://mercurial.selenic.com/bts/issue618
if self._u_any_in_string(empty_strings, output) == True \
and len(self.__updated) > 0:
time.sleep(1)
for path in self.__updated:
os.utime(os.path.join(self.repo, path), None)
status,output,error = self._u_invoke_client(*args)
self.__updated = []
# end work around
if self._u_any_in_string(empty_strings, output) == True:
if allow_empty == False:
raise base.EmptyCommit()
# note that darcs does _not_ make an empty revision.
# this returns the last non-empty revision id...
revision = self._vcs_revision_id(-1)
else:
revline = re.compile("Finished recording patch '(.*)'")
match = revline.search(output)
assert match != None, output+error
assert len(match.groups()) == 1
revision = match.groups()[0]
return revision
def _vcs_revision_id(self, index):
status,output,error = self._u_invoke_client('changes', '--xml')
revisions = []
xml_str = output.encode('unicode_escape').replace(r'\n', '\n')
element = ElementTree.XML(xml_str)
assert element.tag == 'changelog', element.tag
for patch in element.getchildren():
assert patch.tag == 'patch', patch.tag
for child in patch.getchildren():
if child.tag == 'name':
text = unescape(unicode(child.text).decode('unicode_escape').strip())
revisions.append(text)
revisions.reverse()
try:
if index > 0:
return revisions[index-1]
elif index < 0:
return revisions[index]
else:
return None
except IndexError:
return None
if libbe.TESTING == True:
base.make_vcs_testcase_subclasses(Darcs, sys.modules[__name__])
unitsuite =unittest.TestLoader().loadTestsFromModule(sys.modules[__name__])
suite = unittest.TestSuite([unitsuite, doctest.DocTestSuite()])
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