# keyword.py - $Keyword$ expansion for Mercurial
#
# Copyright 2007 Christian Ebert <blacktrash@gmx.net>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.
#
# $Id$
#
# Keyword expansion hack against the grain of a DSCM
#
# There are many good reasons why this is not needed in a distributed
# SCM, still it may be useful in very small projects based on single
# files (like LaTeX packages), that are mostly addressed to an audience
# not running a version control system.
#
# For in-depth discussion refer to
# <http://www.selenic.com/mercurial/wiki/index.cgi/KeywordPlan>.
#
# Keyword expansion is based on Mercurial's changeset template mappings.
#
# Binary files are not touched.
#
# Setup in hgrc:
#
# [extensions]
# # enable extension
# keyword = /full/path/to/hgkw/keyword.py
# # or, if script in canonical hgext folder:
# # hgext.keyword =
#
# Files to act upon/ignore are specified in the [keyword] section.
# Customized keyword template mappings in the [keywordmaps] section.
#
# Run "hg help keyword" and "hg kwdemo" to get info on configuration.
'''keyword expansion in local repositories
This extension expands RCS/CVS-like or self-customized $Keywords$
in tracked text files selected by your configuration.
Keywords are only expanded in local repositories and not stored in
the change history. The mechanism can be regarded as a convenience
for the current user or for archive distribution.
Configuration is done in the [keyword] and [keywordmaps] sections
of hgrc files.
Example:
[keyword]
# expand keywords in every python file except those matching "x*"
**.py =
x* = ignore
Note: the more specific you are in your filename patterns
the less you lose speed in huge repos.
For [keywordmaps] template mapping and expansion demonstration and
control run "hg kwdemo".
An additional date template filter {date|utcdate} is provided.
The default template mappings (view with "hg kwdemo -d") can be replaced
with customized keywords and templates.
Again, run "hg kwdemo" to control the results of your config changes.
Before changing/disabling active keywords, run "hg kwshrink" to avoid
the risk of inadvertedly storing expanded keywords in the change history.
To force expansion after enabling it, or a configuration change, run
"hg kwexpand".
Expansions spanning more than one line and incremental expansions,
like CVS' $Log$, are not supported. A keyword template map
"Log = {desc}" expands to the first line of the changeset description.
Caveat: "hg import" fails if the patch context contains an active
keyword. In that case run "hg kwshrink", and then reimport.
Or, better, use bundle/unbundle to share changes.
'''
from mercurial import commands, cmdutil, context, fancyopts
from mercurial import filelog, localrepo, templater, util, hg
from mercurial.i18n import gettext as _
import re, shutil, sys, tempfile, time
# findcmd, bail_if_changed were in commands until 0c61124ad877
try:
findcmd = cmdutil.findcmd
bail_if_changed = cmdutil.bail_if_changed
except AttributeError:
findcmd = commands.findcmd
bail_if_changed = commands.bail_if_changed
commands.optionalrepo += ' kwdemo'
def utcdate(date):
'''Returns hgdate in cvs-like UTC format.'''
return time.strftime('%Y/%m/%d %H:%M:%S', time.gmtime(date[0]))
class kwtemplater(object):
'''
Sets up keyword templates, corresponding keyword regex, and
provides keyword substitution functions.
'''
templates = {
'Revision': '{node|short}',
'Author': '{author|user}',
'Date': '{date|utcdate}',
'RCSFile': '{file|basename},v',
'Source': '{root}/{file},v',
'Id': '{file|basename},v {node|short} {date|utcdate} {author|user}',
'Header': '{root}/{file},v {node|short} {date|utcdate} {author|user}',
}
def __init__(self, ui, repo, expand, path='', node=None):
self.ui = ui
self.repo = repo
self.t = expand or None
self.path = path
self.node = node
kwmaps = self.ui.configitems('keywordmaps')
if kwmaps:
self.templates = {}
for k, v in kwmaps:
self.templates[k] = templater.parsestring(v, quoted=False)
escaped = [re.escape(k) for k in self.templates.keys()]
rawkeyword = r'\$(%s)(: [^$\n\r]*? )??\$'
self.re_kw = re.compile(rawkeyword % '|'.join(escaped))
if self.t:
templater.common_filters['utcdate'] = utcdate
try:
self.t = cmdutil.changeset_templater(self.ui, self.repo,
False, '', False)
except TypeError:
# depending on hg rev changeset_templater has extra "brinfo" arg
self.t = cmdutil.changeset_templater(self.ui, self.repo,
False, None, '', False)
def _ctxnode(self, node):
'''Obtains missing node from file context.'''
if not self.node:
c = context.filectx(self.repo, self.path, fileid=node)
self.node = c.node()
def _kwsub(self, mobj):
'''Substitutes keyword using corresponding template.'''
kw = mobj.group(1)
self.t.use_template(self.templates[kw])
self.ui.pushbuffer()
self.t.show(changenode=self.node, root=self.repo.root, file=self.path)
keywordsub = templater.firstline(self.ui.popbuffer())
return '$%s: %s $' % (kw, keywordsub)
def expand(self, node, data):
'''Returns data with keywords expanded.'''
if util.binary(data):
return data
self._ctxnode(node)
return self.re_kw.sub(self._kwsub, data)
def process(self, node, data):
'''Returns a tuple: data, count.
Count is number of keywords/keyword substitutions.
Keywords in data are expanded, if templater was initialized.'''
if util.binary(data):
return data, None
if self.t:
self._ctxnode(node)
return self.re_kw.subn(self._kwsub, data)
return data, self.re_kw.search(data)
def shrink(self, text):
'''Returns text with all keyword substitutions removed.'''
if util.binary(text):
return text
return self.re_kw.sub(r'$\1$', text)
def overwrite(self, candidates, man, commit):
'''Overwrites files in working directory if keywords are detected.
Keywords are expanded if keyword templater is initialized,
otherwise their substitution is removed.'''
expand = self.t is not None
action = ('shrinking', 'expanding')[expand]
notify = (self.ui.note, self.ui.debug)[commit]
overwritten = []
for f in candidates:
fp = self.repo.file(f, kwexp=expand, kwcnt=True)
data, kwfound = fp.read(man[f])
if kwfound:
notify(_('overwriting %s %s keywords\n') % (f, action))
try:
self.repo.wwrite(f, data, man.flags(f))
except AttributeError:
# older versions want file descriptor as 3. optional arg
self.repo.wwrite(f, data)
overwritten.append(f)
if overwritten:
try:
for f in overwritten:
self.repo.dirstate.normal(f)
except AttributeError:
# older versions don't know about dirstate.normal
self.repo.dirstate.update(overwritten, 'n')
class kwfilelog(filelog.filelog):
'''
Subclass of filelog to hook into its read, add, cmp methods.
Keywords are "stored" unexpanded, and processed on reading.
'''
def __init__(self, opener, path, kwtemplater, kwcnt):
super(kwfilelog, self).__init__(opener, path)
self.kwtemplater = kwtemplater
self.kwcnt = kwcnt
def read(self, node):
'''Passes data through kwemplater methods for
either unconditional keyword expansion
or counting of keywords and substitution method
set by the calling overwrite function.'''
data = super(kwfilelog, self).read(node)
if not self.kwcnt:
return self.kwtemplater.expand(node, data)
return self.kwtemplater.process(node, data)
def add(self, text, meta, tr, link, p1=None, p2=None):
'''Removes keyword substitutions when adding to filelog.'''
text = self.kwtemplater.shrink(text)
return super(kwfilelog, self).add(text, meta, tr, link, p1=p1, p2=p2)
def cmp(self, node, text):
'''Removes keyword substitutions for comparison.'''
text = self.kwtemplater.shrink(text)
if self.renamed(node):
t2 = super(kwfilelog, self).read(node)
return t2 != text
return super(kwfilelog, self).cmp(node, text)
def _keywordmatcher(ui, repo):
'''Collects include/exclude filename patterns for expansion
candidates of current configuration. Returns filename matching
function if include patterns exist, None otherwise.'''
inc, exc = [], ['.hg*']
for pat, opt in ui.configitems('keyword'):
if opt != 'ignore':
inc.append(pat)
else:
exc.append(pat)
if inc:
return util.matcher(repo.root, inc=inc, exc=exc)[1]
return None
def _weedcandidates(man, kwfmatcher, candidates):
'''Weeds out files that do not match keyword file matcher,
are not tracked, or are links.'''
files = man.keys()
if candidates:
return [f for f in candidates if kwfmatcher(f)
and f in files and not man.linkf(f)]
# kwexpand w/o args on all files in manifest
return [f for f in files if kwfmatcher(f) and not man.linkf(f)]
def _overwrite(ui, repo, files, expand):
'''Expands/shrinks keywords in working directory.'''
wlock = lock = None
try:
wlock = repo.wlock()
lock = repo.lock()
bail_if_changed(repo)
ctx = repo.changectx()
if not ctx:
raise hg.RepoError(_('no revision checked out'))
kwfmatcher = _keywordmatcher(ui, repo)
if kwfmatcher is None:
ui.warn(_('no files configured for keyword expansion\n'))
return
man = ctx.manifest()
files = _weedcandidates(man, kwfmatcher, files)
if not files:
ui.warn(_('files not configured for expansion or untracked\n'))
return
commit = False
kwt = kwtemplater(ui, repo, expand, node=ctx.node())
kwt.overwrite(files, man, commit)
finally:
del wlock, lock
def shrink(ui, repo, *args):
'''revert expanded keywords in working directory
run before changing/disabling active keywords
or if you experience problems with "hg import" or "hg merge"
'''
expand = False
_overwrite(ui, repo, args, expand)
def expand(ui, repo, *args):
'''expand keywords in working directory
run after (re)enabling keyword expansion
'''
expand = True
_overwrite(ui, repo, args, expand)
def demo(ui, repo, *args, **opts):
'''print [keywordmaps] configuration and an expansion example
show current, custom, or default keyword template maps and their expansion
extend current configuration by specifying maps as arguments
and optionally by reading from an additional hgrc file
override current keyword template maps with "default" option
'''
def _demostatus(stat):
ui.status(_('\n\t%s\n') % stat)
def _showitems(section, items):
ui.write('[%s]\n' % section)
for k, v in items:
ui.write('%s = %s\n' % (k, v))
msg = 'hg keyword config and expansion example'
kwstatus = 'current'
fn = 'demo.txt'
branchname = 'demobranch'
tmpdir = tempfile.mkdtemp('', 'kwdemo.')
ui.note(_('creating temporary repo at %s\n') % tmpdir)
repo = localrepo.localrepository(ui, path=tmpdir, create=True)
ui.setconfig('keyword', fn, '')
if args or opts['rcfile']:
kwstatus = 'custom'
if opts['rcfile']:
ui.readconfig(opts['rcfile'])
if opts['default']:
kwstatus = 'default'
kwmaps = kwtemplater.templates
if ui.configitems('keywordmaps'):
# override maps from optional rcfile
for k, v in kwmaps.items():
ui.setconfig('keywordmaps', k, v)
elif args:
# simulate hgrc parsing
rcmaps = ['[keywordmaps]\n'] + [a + '\n' for a in args]
fp = repo.opener('hgrc', 'w')
fp.writelines(rcmaps)
fp.close()
ui.readconfig(repo.join('hgrc'))
if not opts['default']:
kwmaps = dict(ui.configitems('keywordmaps')) or kwtemplater.templates
reposetup(ui, repo)
for k, v in ui.configitems('extensions'):
if k.endswith('keyword'):
extension = '%s = %s' % (k, v)
break
_demostatus('config using %s keyword template maps' % kwstatus)
ui.write('[extensions]\n%s\n' % extension)
_showitems('keyword', ui.configitems('keyword'))
_showitems('keywordmaps', kwmaps.items())
keywords = '$' + '$\n$'.join(kwmaps.keys()) + '$\n'
repo.wopener(fn, 'w').write(keywords)
repo.add([fn])
path = repo.wjoin(fn)
ui.note(_('\n%s keywords written to %s:\n') % (kwstatus, path))
ui.note(keywords)
ui.note('\nhg -R "%s" branch "%s"\n' % (tmpdir, branchname))
# silence branch command if not verbose
quiet = ui.quiet
verbose = ui.verbose
ui.quiet = not verbose
commands.branch(ui, repo, branchname)
ui.quiet = quiet
ui.note('hg -R "%s" ci -m "%s"\n' % (tmpdir, msg))
repo.commit(text=msg)
pathinfo = ('', ' in %s' % path)[ui.verbose]
_demostatus('%s keywords expanded%s' % (kwstatus, pathinfo))
ui.write(repo.wread(fn))
ui.debug(_('\nremoving temporary repo %s\n') % tmpdir)
shutil.rmtree(tmpdir)
def reposetup(ui, repo):
'''Sets up repo as kwrepo for keyword substitution.
Overrides file method to return kwfilelog instead of filelog
if file matches user configuration.
Wraps commit to overwrite configured files with updated
keyword substitutions.
This is done for local repos only, and only if there are
files configured at all for keyword substitution.'''
nokwcommands = ['add', 'addremove', 'bundle', 'clone', 'copy', 'export',
'grep', 'identify', 'incoming', 'init', 'outgoing', 'push',
'remove', 'rename', 'rollback']
def _getcmd():
# commands or cmdutil.parse(ui, sys.argv[1:])[0]
# is broken before 88803a69b24a (fancyopts)
# results in no output from "hg diff --rev" with older hg versions
args = fancyopts.fancyopts(sys.argv[1:], commands.globalopts, {})
if args:
cmd = args[0]
aliases, i = findcmd(ui, cmd)
return aliases[0]
if not repo.local() or _getcmd() in nokwcommands:
return
kwfmatcher = _keywordmatcher(ui, repo)
if kwfmatcher is None:
return
class kwrepo(repo.__class__):
def file(self, f, kwexp=True, kwcnt=False):
if f[0] == '/':
f = f[1:]
if kwfmatcher(f):
kwt = kwtemplater(ui, self, kwexp, path=f)
return kwfilelog(self.sopener, f, kwt, kwcnt)
return filelog.filelog(self.sopener, f)
def commit(self, files=None, text='', user=None, date=None,
match=util.always, force=False, lock=None, wlock=None,
force_editor=False, p1=None, p2=None, extra={}):
try:
kwlock = lock
kwwlock = wlock
del wlock, lock
except NameError:
# (w)lock arguments removed in recent Hg versions
kwwlock = kwlock = None
try:
if not kwwlock:
kwwlock = self.wlock()
if not kwlock:
kwlock = self.lock()
try:
node = super(kwrepo,
self).commit(files=files, text=text,
user=user, date=date,
match=match, force=force,
lock=kwlock, wlock=kwwlock,
force_editor=force_editor,
p1=p1, p2=p2, extra=extra)
except TypeError:
node = super(kwrepo,
self).commit(files=files, text=text,
user=user, date=date,
match=match, force=force,
force_editor=force_editor,
p1=p1, p2=p2, extra=extra)
if node is not None:
cl = self.changelog.read(node)
mn = self.manifest.read(cl[0])
candidates = _weedcandidates(mn, kwfmatcher, cl[3])
if candidates:
expand = commit = True
kwt = kwtemplater(ui, self, expand, node=node)
kwt.overwrite(candidates, mn, commit)
return node
finally:
del kwwlock, kwlock
repo.__class__ = kwrepo
cmdtable = {
'kwdemo':
(demo,
[('d', 'default', None, _('show default keyword template maps')),
('f', 'rcfile', [], _('read maps from RCFILE'))],
_('hg kwdemo [-d] [-f RCFILE] [TEMPLATEMAP ...]')),
'kwshrink': (shrink, [], _('hg kwshrink [NAME] ...')),
'kwexpand': (expand, [], _('hg kwexpand [NAME] ...')),
}