hgkw/keyword.py
author Christian Ebert <blacktrash@gmx.net>
Fri, 30 Mar 2007 17:12:38 +0200
branchkwmap-templates
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parent 156 0382bccf861e
child 159 28fd5b5eb3ad
permissions -rw-r--r--
kwfmatcher first check for commit
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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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# 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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# Binary files are not touched.
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#
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# 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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'''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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The exansion works in 2 modes:
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    1) working mode: substitution takes place on every commit and
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       update of the working repository.
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    2) archive mode: substitution is only triggered by "hg archive".
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Caveat: "hg import" might fail if the patches were exported from a
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repo with a different/no keyword setup, whereas "hg unbundle" is
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safe.
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Configuration is done in the [keyword] and [keywordmaps] sections of
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hgrc files.
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Example:
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     [keyword]
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     # filename patterns for expansion are configured in this section
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     **.py =          ## expand keywords in all python files
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     x* = ignore      ## but ignore files matching "x*"
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     ** = archive     ## keywords in all textfiles are expanded
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                      ## when creating a distribution
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     y* = noarchive   ## keywords in files matching "y*" are not expanded
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                      ## on archive creation
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     ...
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     [keywordmaps]
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     # custom hg template maps _replace_ the CVS-like default ones
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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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If no [keywordmaps] are configured the extension falls back on the
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following defaults:
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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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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:commands,fancyopts,templater,util')
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    demandload(globals(), 'mercurial:cmdutil,context,filelog')
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    demandload(globals(), 'os re sys time')
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except ImportError:                    # demandimport
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    from mercurial.i18n import _
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    from mercurial import commands, fancyopts, templater, util
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    from mercurial import cmdutil, context, filelog
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    import os, re, sys, 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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def getcmd(ui):
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    '''Returns current hg command.'''
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    # commands.parse(ui, sys.argv[1:])[0] breaks "hg diff -r"
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    try:
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        args = fancyopts.fancyopts(sys.argv[1:], commands.globalopts, {})
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    except fancyopts.getopt.GetoptError, inst:
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        raise commands.ParseError(None, inst)
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    if args:
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        cmd = args[0]
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        aliases, i = commands.findcmd(ui, cmd)
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        return aliases[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 substitution functions.
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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)[^$]*?\$' %
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                '|'.join([re.escape(k) for k in self.templates.keys()]))
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        templater.common_filters['utcdate'] = utcdate
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        try:
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            self.t = cmdutil.changeset_templater(ui, repo,
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                    False, '', False)
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        except TypeError:
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            # depending on hg rev changeset_templater has extra "brinfo" arg
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            self.t = cmdutil.changeset_templater(ui, repo,
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                    False, None, '', False)
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134
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    def kwsub(self, mobj, path, node):
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        '''Substitutes keyword using corresponding template.'''
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        kw = mobj.group(1)
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        self.t.use_template(self.templates[kw])
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        self.ui.pushbuffer()
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        self.t.show(changenode=node, root=self.repo.root, file=path)
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        keywordsub = templater.firstline(self.ui.popbuffer())
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        return '$%s: %s $' % (kw, keywordsub)
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    def expand(self, path, node, filelog, data):
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        '''Returns data with expanded keywords.'''
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        if util.binary(data):
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            return data
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        c = context.filectx(self.repo, path, fileid=node, filelog=filelog)
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        cnode = c.node()
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        return self.re_kw.sub(lambda m: self.kwsub(m, path, cnode), data)
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    def shrink(self, text):
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        '''Returns text with all keyword substitutions removed.'''
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        if util.binary(text):
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            return text
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        return self.re_kw.sub(r'$\1$', text)
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    def overwrite(self, candidates, node):
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        '''Overwrites candidates in working dir expanding keywords.'''
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        files = []
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        for f in candidates:
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            data = self.repo.wfile(f).read()
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            if not util.binary(data):
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                data, kwct = self.re_kw.subn(lambda m:
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                        self.kwsub(m, f, node), data)
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                if kwct:
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                    self.ui.debug(_('overwriting %s expanding keywords\n') % f)
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                    self.repo.wfile(f, 'w').write(data)
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                    files.append(f)
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        if files:
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            self.repo.dirstate.update(files, 'n')
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class kwfilelog(filelog.filelog):
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    '''
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    Superclass over filelog to customize its 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, kwtemplater):
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        super(kwfilelog, self).__init__(opener, path)
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        self.path = path
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        self.kwtemplater = kwtemplater
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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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        return self.kwtemplater.expand(self.path, node, self, 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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        text = self.kwtemplater.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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        text = self.kwtemplater.shrink(text)
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        return super(kwfilelog, self).cmp(node, text)
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   215
42
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def reposetup(ui, repo):
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    '''Sets up repo as kwrepo for keyword substitution.
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    Overrides file method to return kwfilelog instead of filelog
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    if file matches user configuration.
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    Wraps commit to overwrite configured files with updated
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    keyword substitutions.
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    This is done for local repos only, and only if there are
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    files configured at all for keyword substitution.'''
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    if not repo.local():
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        return
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149
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    archivemode = (getcmd(repo.ui) == 'archive')
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    inc, exc, archive, noarchive = [], ['.hg*'], [], ['.hg*']
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    for pat, opt in repo.ui.configitems('keyword'):
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        if opt == 'archive':
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            archive.append(pat)
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        elif opt == 'noarchive':
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            noarchive.append(pat)
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        elif opt == 'ignore':
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            exc.append(pat)
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        else:
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            inc.append(pat)
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    if archivemode:
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        inc, exc = archive, noarchive
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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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            # only use kwfilelog when needed
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            if self.kwfmatcher(f):
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                kwt = kwtemplater(self.ui, self)
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                return kwfilelog(self.sopener, f, kwt)
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            else:
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                return filelog.filelog(self.sopener, f)
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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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            wrelease = False
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            if not wlock:
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                wlock = self.wlock()
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                wrelease = True
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            try:
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                removed = self.status()[2]
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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 if self.kwfmatcher(f)
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                        and f not in removed
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                        and not os.path.islink(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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                kwt.overwrite(candidates, node)
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                return node
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            finally:
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                if wrelease:
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                    wlock.release()
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    repo.__class__ = kwrepo