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hgk: enable selected patch text on Windows...
hgk: enable selected patch text on Windows Port a patch from gitk. Original description: On windows, mouse input follows the keyboard focus, so to allow selecting text from the patch canvas we must not shift focus back to the top level. This change has no negative impact on X, so we don't explicitly test for Win32 on this change. This provides similar selection capability as already available using X-Windows. Signed-off-by: Mark Levedahl <mdl123@verizon.net> Signed-off-by: Paul Mackerras <paulus@samba.org>

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transaction.py
183 lines | 5.1 KiB | text/x-python | PythonLexer
# transaction.py - simple journaling scheme for mercurial
#
# This transaction scheme is intended to gracefully handle program
# errors and interruptions. More serious failures like system crashes
# can be recovered with an fsck-like tool. As the whole repository is
# effectively log-structured, this should amount to simply truncating
# anything that isn't referenced in the changelog.
#
# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from i18n import _
import errno
import error
def active(func):
def _active(self, *args, **kwds):
if self.count == 0:
raise error.Abort(_(
'cannot use transaction when it is already committed/aborted'))
return func(self, *args, **kwds)
return _active
def _playback(journal, report, opener, entries, unlink=True):
for f, o, ignore in entries:
if o or not unlink:
try:
fp = opener(f, 'a')
fp.truncate(o)
fp.close()
except IOError:
report(_("failed to truncate %s\n") % f)
raise
else:
try:
opener.unlink(f)
except (IOError, OSError), inst:
if inst.errno != errno.ENOENT:
raise
opener.unlink(journal)
class transaction(object):
def __init__(self, report, opener, journal, after=None, createmode=None):
self.count = 1
self.usages = 1
self.report = report
self.opener = opener
self.after = after
self.entries = []
self.map = {}
self.journal = journal
self._queue = []
self.file = opener.open(self.journal, "w")
if createmode is not None:
opener.chmod(self.journal, createmode & 0666)
def __del__(self):
if self.journal:
self._abort()
@active
def startgroup(self):
self._queue.append([])
@active
def endgroup(self):
q = self._queue.pop()
d = ''.join(['%s\0%d\n' % (x[0], x[1]) for x in q])
self.entries.extend(q)
self.file.write(d)
self.file.flush()
@active
def add(self, file, offset, data=None):
if file in self.map:
return
if self._queue:
self._queue[-1].append((file, offset, data))
return
self.entries.append((file, offset, data))
self.map[file] = len(self.entries) - 1
# add enough data to the journal to do the truncate
self.file.write("%s\0%d\n" % (file, offset))
self.file.flush()
@active
def find(self, file):
if file in self.map:
return self.entries[self.map[file]]
return None
@active
def replace(self, file, offset, data=None):
'''
replace can only replace already committed entries
that are not pending in the queue
'''
if file not in self.map:
raise KeyError(file)
index = self.map[file]
self.entries[index] = (file, offset, data)
self.file.write("%s\0%d\n" % (file, offset))
self.file.flush()
@active
def nest(self):
self.count += 1
self.usages += 1
return self
def release(self):
if self.count > 0:
self.usages -= 1
# if the transaction scopes are left without being closed, fail
if self.count > 0 and self.usages == 0:
self._abort()
def running(self):
return self.count > 0
@active
def close(self):
'''commit the transaction'''
self.count -= 1
if self.count != 0:
return
self.file.close()
self.entries = []
if self.after:
self.after()
if self.opener.isfile(self.journal):
self.opener.unlink(self.journal)
self.journal = None
@active
def abort(self):
'''abort the transaction (generally called on error, or when the
transaction is not explicitly committed before going out of
scope)'''
self._abort()
def _abort(self):
self.count = 0
self.usages = 0
self.file.close()
try:
if not self.entries:
if self.journal:
self.opener.unlink(self.journal)
return
self.report(_("transaction abort!\n"))
try:
_playback(self.journal, self.report, self.opener,
self.entries, False)
self.report(_("rollback completed\n"))
except Exception:
self.report(_("rollback failed - please run hg recover\n"))
finally:
self.journal = None
def rollback(opener, file, report):
entries = []
fp = opener.open(file)
lines = fp.readlines()
fp.close()
for l in lines:
try:
f, o = l.split('\0')
entries.append((f, int(o), None))
except ValueError:
report(_("couldn't read journal entry %r!\n") % l)
_playback(file, report, opener, entries)