hgkw/keyword.py
author Christian Ebert <blacktrash@gmx.net>
Fri, 09 Feb 2007 16:16:22 +0100
branchkwmap-templates
changeset 136 5e9d6c57d679
parent 135 a4c748fc7e00
child 137 bfea48fbcb88
permissions -rw-r--r--
Parse templates at kwtemplater init for less overhead in matchfunction
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# keyword.py - keyword expansion for Mercurial
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#
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# Copyright 2007 Christian Ebert <blacktrash@gmx.net>
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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#
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# $Id$
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#
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# Keyword expansion hack against the grain of a DSCM
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#
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# There are many good reasons why this is not needed in a distributed
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# SCM, still it may be useful in very small projects based on single
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# files (like LaTeX packages), that are mostly addressed to an audience
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# not running a version control system.
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#
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# For in-depth discussion refer to
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# <http://www.selenic.com/mercurial/wiki/index.cgi/KeywordPlan>.
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#
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# Keyword expansion is based on Mercurial's changeset template mappings.
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# The extension provides an additional UTC-date filter ({date|utcdate}).
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#
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# The user has the choice either to create his own keywords and their
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# expansions or to use the CVS-like default ones.
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#
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# Default $keywords$ and their $keyword: substition $ are:
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#     Revision: changeset id
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#     Author:   username
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#     Date:     %Y/%m/%d %H:%M:%S [UTC]
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#     RCSFile:  basename,v
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#     Source:   /path/to/basename,v
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#     Id:       basename,v csetid %Y/%m/%d %H:%M:%S username
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#     Header:   /path/to/basename,v csetid %Y/%m/%d %H:%M:%S username
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#
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# Expansions spanning more than one line are truncated to their first line.
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# Incremental expansion (like CVS' $Log$) is not supported.
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#
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# Simple setup in hgrc:
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#
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#     # enable extension
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#     keyword = /full/path/to/keyword.py
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#     # or, if script in hgext folder:
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#     # hgext.keyword =
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#
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#     # filename patterns for expansion are configured in this section
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#     # files matching patterns with value 'ignore' are ignored
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#     [keyword]
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#     **.py =
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#     x* = ignore
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#     ...
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#     # in case you prefer your own keyword maps over the cvs-like defaults:
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#     [keywordmaps]
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#     HGdate = {date|rfc822date}
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#     lastlog = {desc} ## same as {desc|firstline} in this context
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#     checked in by = {author}
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#     ...
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'''keyword expansion in local repositories
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This extension expands RCS/CVS-like or self-customized keywords in
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the text files selected by your configuration.
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Keywords are only expanded in local repositories and not logged by
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Mercurial internally. The mechanism can be regarded as a convenience
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for the current user and may be turned off anytime.
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Substitution takes place on every commit and update of the working
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repository.
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Configuration is done in the [keyword] and [keywordmaps] sections of
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hgrc files.
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'''
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try:
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    from mercurial.demandload import * # stable
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    from mercurial.i18n import gettext as _
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    demandload(globals(), 'mercurial:cmdutil,templater,util')
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    demandload(globals(), 'mercurial:context,filelog,revlog')
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    demandload(globals(), 'os.path re time')
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except ImportError: # demandimport
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    from mercurial.i18n import _
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    from mercurial import cmdutil, templater, util
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    from mercurial import context, filelog, revlog
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    import os.path, re, time
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deftemplates = {
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        'Revision': '{node|short}',
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        'Author': '{author|user}',
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        'Date': '{date|utcdate}',
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        'RCSFile': '{file|basename},v',
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        'Source': '{root}/{file},v',
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        'Id': '{file|basename},v {node|short} {date|utcdate} {author|user}',
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        'Header': '{root}/{file},v {node|short} {date|utcdate} {author|user}',
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        }
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def utcdate(date):
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    '''Returns hgdate in cvs-like UTC format.'''
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    return time.strftime('%Y/%m/%d %H:%M:%S', time.gmtime(date[0]))
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class kwtemplater(object):
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    '''
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    Sets up keyword templates, corresponding keyword regex, and
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    provides keyword expansion function.
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    '''
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    def __init__(self, ui, repo):
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        self.ui = ui
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        self.repo = repo
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        templates = dict(ui.configitems('keywordmaps'))
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        if templates:
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            # parse templates here for less overhead in kwsub matchfunc
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            for k in templates.keys():
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                templates[k] = templater.parsestring(templates[k],
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                        quoted=False)
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        self.templates = templates or deftemplates
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        self.re_kw = re.compile(r'\$(%s)[^$]*?\$' %
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                '|'.join(re.escape(k) for k in self.templates.keys()))
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        templater.common_filters['utcdate'] = utcdate
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        try:
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            self.t = cmdutil.changeset_templater(ui, repo,
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                    False, '', False)
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        except TypeError:
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            # depending on hg rev changeset_templater has extra "brinfo" arg
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            self.t = cmdutil.changeset_templater(ui, repo,
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                    False, None, '', False)
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    def kwsub(self, mobj, path, node):
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        '''Substitutes keyword using corresponding template.'''
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        kw = mobj.group(1)
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        self.t.use_template(self.templates[kw])
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        self.ui.pushbuffer()
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        self.t.show(changenode=node, root=self.repo.root, file=path)
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        keywordsub = templater.firstline(self.ui.popbuffer())
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        return '$%s: %s $' % (kw, keywordsub)
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    def expand(self, path, node, data):
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        '''Returns data with expanded keywords.'''
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        if util.binary(data):
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            return data
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        return self.re_kw.sub(lambda m: self.kwsub(m, path, node), data)
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    def expandn(self, path, node, data):
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        '''Returns data with expanded keywords and number of expansions.'''
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        if util.binary(data):
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            return data, None
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        return self.re_kw.subn(lambda m: self.kwsub(m, path, node), data)
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    def shrink(self, text):
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        '''Returns text with all keyword substitutions removed.'''
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        if util.binary(text):
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            return text
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        return self.re_kw.sub(r'$\1$', text)
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def reposetup(ui, repo):
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    '''Sets up repo, and filelog especially, as kwrepo and kwfilelog
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    for keyword substitution. This is done for local repos only.'''
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    if not repo.local():
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        return
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    inc, exc = [], ['.hg*']
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    for pat, opt in repo.ui.configitems('keyword'):
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        if opt != 'ignore':
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            inc.append(pat)
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        else:
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            exc.append(pat)
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    if not inc:
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        return
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    repo.kwfmatcher = util.matcher(repo.root, inc=inc, exc=exc)[1]
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    class kwrepo(repo.__class__):
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        def file(self, f):
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            if f[0] == '/':
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                f = f[1:]
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            return filelog.filelog(self.sopener, f, self, self.revlogversion)
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        def commit(self, files=None, text="", user=None, date=None,
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                match=util.always, force=False, lock=None, wlock=None,
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                force_editor=False, p1=None, p2=None, extra={}):
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            '''Wraps commit, expanding keywords of committed and
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            configured files in working directory.'''
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            node = super(kwrepo, self).commit(files=files,
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                    text=text, user=user, date=date,
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                    match=match, force=force, lock=lock, wlock=wlock,
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                    force_editor=force_editor, p1=p1, p2=p2, extra=extra)
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            if node is None:
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                return node
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            candidates = self.changelog.read(node)[3]
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            candidates = [f for f in candidates
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                    if self.kwfmatcher(f) and os.path.isfile(self.wjoin(f))]
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            if not candidates:
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                return node
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            kwt = kwtemplater(self.ui, self)
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            overwrite = []
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            for f in candidates:
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                data = self.wfile(f).read()
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                data, kwct = kwt.expandn(f, node, data)
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                if kwct:
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                    ui.debug(_('overwriting %s expanding keywords\n' % f))
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                    self.wfile(f, 'w').write(data)
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                    overwrite.append(f)
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            if overwrite:
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                self.dirstate.update(overwrite, 'n')
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            return node
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    class kwfilelog(filelog.filelog):
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        '''
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        Superclass over filelog to customize it's read, add, cmp methods.
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        Keywords are "stored" unexpanded, and expanded on reading.
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        '''
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        def __init__(self, opener, path, repo,
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                     defversion=revlog.REVLOG_DEFAULT_VERSION):
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            super(kwfilelog, self).__init__(opener, path, defversion)
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            self._repo = repo
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            self._path = path
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            # only init kwtemplater if needed
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            if not isinstance(repo, int) and repo.kwfmatcher(path):
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                self.kwt = kwtemplater(repo.ui, repo)
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            else:
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                self.kwt = None
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        def read(self, node):
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            '''Substitutes keywords when reading filelog.'''
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            data = super(kwfilelog, self).read(node)
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            if self.kwt:
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                c = context.filectx(self._repo, self._path,
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                                    fileid=node, filelog=self)
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                data = self.kwt.expand(self._path, c.node(), data)
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            return data
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        def add(self, text, meta, tr, link, p1=None, p2=None):
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            '''Removes keyword substitutions when adding to filelog.'''
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            if self.kwt:
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                text = self.kwt.shrink(text)
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            return super(kwfilelog, self).add(text,
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                            meta, tr, link, p1=p1, p2=p2)
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        def cmp(self, node, text):
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            '''Removes keyword substitutions for comparison.'''
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            if self.kwt:
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                text = self.kwt.shrink(text)
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            return super(kwfilelog, self).cmp(node, text)
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    filelog.filelog = kwfilelog
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    repo.__class__ = kwrepo