config: explicitly track the use of the standard default value
We introduce a small object used to detect that no specific default value has
been passed to 'ui.config'. We need this explicit special value since "None" is
a valid and common default value.
The end goal here is to make progress on a centralised and explicit declaration
of the available config option. A first good usecase for this are "default"
value. Before starting looking further down this alley we needs to rework the
handling of default value in the 'ui' object to have all configxyz methods going
through the same logic. This is the first changeset on this trek.
# coding=UTF-8
from __future__ import absolute_import
import base64
import zlib
from mercurial import (
changegroup,
exchange,
extensions,
filelog,
revlog,
util,
)
# Test only: These flags are defined here only in the context of testing the
# behavior of the flag processor. The canonical way to add flags is to get in
# touch with the community and make them known in revlog.
REVIDX_NOOP = (1 << 3)
REVIDX_BASE64 = (1 << 2)
REVIDX_GZIP = (1 << 1)
REVIDX_FAIL = 1
def validatehash(self, text):
return True
def bypass(self, text):
return False
def noopdonothing(self, text):
return (text, True)
def b64encode(self, text):
return (base64.b64encode(text), False)
def b64decode(self, text):
return (base64.b64decode(text), True)
def gzipcompress(self, text):
return (zlib.compress(text), False)
def gzipdecompress(self, text):
return (zlib.decompress(text), True)
def supportedoutgoingversions(orig, repo):
versions = orig(repo)
versions.discard('01')
versions.discard('02')
versions.add('03')
return versions
def allsupportedversions(orig, ui):
versions = orig(ui)
versions.add('03')
return versions
def noopaddrevision(orig, self, text, transaction, link, p1, p2,
cachedelta=None, node=None,
flags=revlog.REVIDX_DEFAULT_FLAGS):
if '[NOOP]' in text:
flags |= REVIDX_NOOP
return orig(self, text, transaction, link, p1, p2, cachedelta=cachedelta,
node=node, flags=flags)
def b64addrevision(orig, self, text, transaction, link, p1, p2,
cachedelta=None, node=None,
flags=revlog.REVIDX_DEFAULT_FLAGS):
if '[BASE64]' in text:
flags |= REVIDX_BASE64
return orig(self, text, transaction, link, p1, p2, cachedelta=cachedelta,
node=node, flags=flags)
def gzipaddrevision(orig, self, text, transaction, link, p1, p2,
cachedelta=None, node=None,
flags=revlog.REVIDX_DEFAULT_FLAGS):
if '[GZIP]' in text:
flags |= REVIDX_GZIP
return orig(self, text, transaction, link, p1, p2, cachedelta=cachedelta,
node=node, flags=flags)
def failaddrevision(orig, self, text, transaction, link, p1, p2,
cachedelta=None, node=None,
flags=revlog.REVIDX_DEFAULT_FLAGS):
# This addrevision wrapper is meant to add a flag we will not have
# transforms registered for, ensuring we handle this error case.
if '[FAIL]' in text:
flags |= REVIDX_FAIL
return orig(self, text, transaction, link, p1, p2, cachedelta=cachedelta,
node=node, flags=flags)
def extsetup(ui):
# Enable changegroup3 for flags to be sent over the wire
wrapfunction = extensions.wrapfunction
wrapfunction(changegroup,
'supportedoutgoingversions',
supportedoutgoingversions)
wrapfunction(changegroup,
'allsupportedversions',
allsupportedversions)
# Teach revlog about our test flags
flags = [REVIDX_NOOP, REVIDX_BASE64, REVIDX_GZIP, REVIDX_FAIL]
revlog.REVIDX_KNOWN_FLAGS |= util.bitsfrom(flags)
revlog.REVIDX_FLAGS_ORDER.extend(flags)
# Teach exchange to use changegroup 3
for k in exchange._bundlespeccgversions.keys():
exchange._bundlespeccgversions[k] = '03'
# Add wrappers for addrevision, responsible to set flags depending on the
# revision data contents.
wrapfunction(filelog.filelog, 'addrevision', noopaddrevision)
wrapfunction(filelog.filelog, 'addrevision', b64addrevision)
wrapfunction(filelog.filelog, 'addrevision', gzipaddrevision)
wrapfunction(filelog.filelog, 'addrevision', failaddrevision)
# Register flag processors for each extension
revlog.addflagprocessor(
REVIDX_NOOP,
(
noopdonothing,
noopdonothing,
validatehash,
)
)
revlog.addflagprocessor(
REVIDX_BASE64,
(
b64decode,
b64encode,
bypass,
),
)
revlog.addflagprocessor(
REVIDX_GZIP,
(
gzipdecompress,
gzipcompress,
bypass
)
)