hgkw/keyword.py
author Christian Ebert <blacktrash@gmx.net>
Tue, 17 Jul 2007 09:45:36 +0200
branchkwmap-templates
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parent 183 80fa00250c6d
child 185 bc5cd6cf69bc
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Set ui to repo.ui at once where needed for backwards compatibility
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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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An additional date template filter {date|utcdate} is provided.
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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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    [extensions]
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    hgext.keyword =
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    [keyword]
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    # expand keywords in every python file,
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    # except those matching "x*"
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    **.py =
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    x* = ignore
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For [keywordmaps] demonstration run "hg kwdemo".
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'''
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from mercurial.i18n import gettext as _
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from mercurial import commands, fancyopts, templater, util
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from mercurial import cmdutil, context, filelog, localrepo
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# findcmd might be in cmdutil or commands
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# depending on mercurial version
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if hasattr(cmdutil, 'findcmd'):
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    findcmd = cmdutil.findcmd
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else:
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    findcmd = commands.findcmd
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import os, re, shutil, sys, tempfile, 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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nokwcommands = ('add', 'addremove', 'bundle', 'clone', 'copy', 'export',
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                'incoming', 'outgoing', 'push', 'remove', 'rename', 'rollback')
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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 = findcmd(ui, cmd)
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        return aliases[0]
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def keywordmatcher(ui, repo):
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    '''Collects include/exclude filename patterns for expansion
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    candidates of current configuration. Returns filename matching
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    function if include patterns exist, None otherwise.'''
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    inc, exc = [], ['.hg*']
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    for pat, opt in 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 None
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    return util.matcher(repo.root, inc=inc, exc=exc)[1]
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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, path='', node=None):
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        self.ui = ui
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        self.repo = repo
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        self.path = path
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        self.node = node
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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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        escaped = [re.escape(k) for k in self.templates.keys()]
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        self.re_kw = re.compile(r'\$(%s)[^$]*?\$' % '|'.join(escaped))
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        templater.common_filters['utcdate'] = utcdate
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        try:
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            self.t = cmdutil.changeset_templater(ui, repo, False, '', False)
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        except TypeError:
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            # depending on hg rev changeset_templater has extra "brinfo" arg
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            self.t = cmdutil.changeset_templater(ui, repo,
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                                                 False, None, '', False)
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    def kwsub(self, mobj):
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        '''Substitutes keyword using corresponding template.'''
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        kw = mobj.group(1)
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        self.t.use_template(self.templates[kw])
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        self.ui.pushbuffer()
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        self.t.show(changenode=self.node, root=self.repo.root, file=self.path)
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        keywordsub = templater.firstline(self.ui.popbuffer())
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        return '$%s: %s $' % (kw, keywordsub)
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    def expand(self, node, data):
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        '''Returns data with expanded keywords.'''
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        if util.binary(data):
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            return data
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        c = context.filectx(self.repo, self.path, fileid=node)
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        self.node = c.node()
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        return self.re_kw.sub(self.kwsub, data)
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    def shrink(self, text):
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        '''Returns text with all keyword substitutions removed.'''
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        if util.binary(text):
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            return text
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        return self.re_kw.sub(r'$\1$', text)
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    def overwrite(self, candidates, mn):
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        '''Overwrites candidates in working dir expanding keywords.'''
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        files = []
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        m = self.repo.manifest.read(mn)
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        for f in candidates:
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            data = self.repo.wread(f)
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            if not util.binary(data):
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                self.path = f
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                data, kwct = self.re_kw.subn(self.kwsub, 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.wwrite(f, data, m.flags(f))
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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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    Subclass of filelog to hook into 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.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(node, 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, 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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        if self.renamed(node):
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            t2 = super(kwfilelog, self).read(node)
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            return t2 != text
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        return super(kwfilelog, self).cmp(node, text)
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42
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def demo(ui, repo, **opts):
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    '''print [keywordmaps] configuration and an expansion example
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    '''
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    msg = 'hg keyword config and expansion example'
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    fn = 'demo.txt'
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    tmpdir = tempfile.mkdtemp('', 'kwdemo.')
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    ui.note(_('creating temporary repo at %s\n') % tmpdir)
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    _repo = localrepo.localrepository(ui, path=tmpdir, create=True)
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    # for backwards compatibility
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    ui = _repo.ui
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    ui.setconfig('keyword', fn, '')
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    if opts['default']:
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        kwstatus = 'default'
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        kwmaps = deftemplates
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    else:
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        kwstatus = 'current'
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        kwmaps = dict(ui.configitems('keywordmaps')) or deftemplates
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    if ui.configitems('keywordmaps'):
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        for k, v in kwmaps.items():
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            ui.setconfig('keywordmaps', k, v)
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    reposetup(ui, _repo)
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    ui.status(_('config with %s keyword template maps:\n') % kwstatus)
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    ui.write('[keyword]\n%s =\n[keywordmaps]\n' % fn)
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    for k, v in kwmaps.items():
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        ui.write('%s = %s\n' % (k, v))
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    path = _repo.wjoin(fn)
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    keywords = '$' + '$\n$'.join(kwmaps.keys()) + '$\n'
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    _repo.wopener(fn, 'w').write(keywords)
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    _repo.add([fn])
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    ui.note(_('\n%s keywords written to %s:\n') % (kwstatus, path))
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    ui.note(keywords)
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    ui.note(_("\nhg --repository '%s' commit\n") % tmpdir)
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    _repo.commit(text=msg)
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    pathinfo = ('', ' in %s' % path)[ui.verbose]
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    ui.status(_('\n%s keywords expanded%s:\n') % (kwstatus, pathinfo))
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    ui.write(_repo.wread(fn))
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    ui.debug(_('\nremoving temporary repo %s\n') % tmpdir)
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    shutil.rmtree(tmpdir)
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182
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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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    # for backwards compatibility
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    ui = repo.ui
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    if not repo.local() or getcmd(ui) in nokwcommands:
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        return
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    kwfmatcher = keywordmatcher(ui, repo)
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    if kwfmatcher is None:
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        return
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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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            if kwfmatcher(f):
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                kwt = kwtemplater(ui, self, path=f)
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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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            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(node1=p1, node2=p2, files=files,
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                                      match=match, wlock=wlock)[2]
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                node = super(kwrepo,
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                             self).commit(files=files, text=text, user=user,
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                                          date=date, match=match, force=force,
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                                          lock=lock, wlock=wlock,
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                                          force_editor=force_editor,
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                                          p1=p1, p2=p2, extra=extra)
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                if node is None:
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                    return node
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                cl = self.changelog.read(node)
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                candidates = [f for f in cl[3] if 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 candidates:
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                    kwt = kwtemplater(ui, self, node=node)
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                    kwt.overwrite(candidates, cl[0])
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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
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cmdtable = {
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    'kwdemo':
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        (demo,
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         [('d', 'default', None, _('use default keyword maps'))],
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         _('hg kwdemo [-d]')),
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}