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# Copyright (C) 2009 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')
num_part = output.split(' ')[0]
self.parsed_version = [int(i) for i in num_part.split('.')]
return output
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)
else:
if self.parsed_version[0] >= 2:
status,output,error = self._u_invoke_client( \
'show', 'contents', '--patch', revision, path)
return output
else:
# 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_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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