hgkw/keyword.py
author Christian Ebert <blacktrash@gmx.net>
Wed, 18 Jul 2007 16:17:04 +0200
branchkwmap-templates
changeset 187 a01a0392f648
parent 186 c1b7b1d052de
child 188 c5e1a361d009
permissions -rw-r--r--
kwdemo accepts maps as arguments, reads from optional rcfile
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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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# 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 $Keywords$
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in 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 or archive distribution.
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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 except those matching "x*"
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    **.py =
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    x* = ignore
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Note: the more specific you are in your [keyword] filename patterns
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      the less you lose speed in huge repos.
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For a [keywordmaps] template mapping and expansion demonstration
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run "hg kwdemo".
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An additional date template filter {date|utcdate} is provided.
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You can replace the default template mappings with customized keywords
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and templates of your choice.
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Again, run "hg kwdemo" to control the results of your config changes.
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When you change keyword configuration, especially the active keywords,
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and do not want to store expanded keywords in change history, run
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"hg kwshrink", and then change configuration.
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Caveat: "hg import" fails if the patch context contains an active
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        keyword. In that case run "hg kwshrink", reimport, and then
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        "hg kwexpand".
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        Or, better, use bundle/unbundle to share changes.
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'''
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from mercurial import commands, cmdutil, context, fancyopts
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from mercurial import filelog, localrepo, templater, util, hg
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from mercurial.i18n import gettext as _
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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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commands.optionalrepo += ' kwdemo'
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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, expand=True):
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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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            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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        if expand:
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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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        else:
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            self.t = None
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    def ctxnode(self, node):
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        '''Obtains missing node from file context.'''
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        if not self.node:
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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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    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 keywords expanded.'''
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        if util.binary(data):
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            return data
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        self.ctxnode(node)
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        return self.re_kw.sub(self.kwsub, data)
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186
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    def process(self, node, data):
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        '''Returns a tuple: data, count.
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        Count is number of keywords/keyword substitutions.
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        Keywords in data are expanded, if templater was initialized.'''
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        if util.binary(data):
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            return data, None
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        if self.t:
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            self.ctxnode(node)
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            return self.re_kw.subn(self.kwsub, data)
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        return data, self.re_kw.search(data)
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   196
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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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   202
186
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    def overwrite(self, candidates, man, commit=True):
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        '''Overwrites files in working directory if keywords are detected.
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        Keywords are expanded if keyword templater is initialized,
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   206
        otherwise their substitution is removed.'''
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        expand = self.t is not None
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        action = ('shrinking', 'expanding')[expand]
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        notify = (self.ui.note, self.ui.debug)[commit]
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        files = []
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        for f in candidates:
186
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            fp = self.repo.file(f, kwcnt=True, kwexp=expand)
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            data, cnt = fp.read(man[f])
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            if cnt:
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                notify(_('overwriting %s %s keywords\n') % (f, action))
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                self.repo.wwrite(f, data, man.flags(f))
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   217
                files.append(f)
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        if files:
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            self.repo.dirstate.update(files, 'n')
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   220
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   221
class kwfilelog(filelog.filelog):
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   222
    '''
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    Subclass of filelog to hook into its read, add, cmp methods.
186
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   224
    Keywords are "stored" unexpanded, and processed on reading.
144
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   225
    '''
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   226
    def __init__(self, opener, path, kwtemplater, kwcnt):
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   227
        super(kwfilelog, self).__init__(opener, path)
144
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   228
        self.kwtemplater = kwtemplater
186
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   229
        self.kwcnt = kwcnt
144
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   230
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   231
    def read(self, node):
186
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   232
        '''Passes data through kwemplater methods for
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   233
        either unconditional keyword expansion
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   234
        or counting of keywords and substitution method
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   235
        set by the calling overwrite function.'''
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   236
        data = super(kwfilelog, self).read(node)
186
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   237
        if not self.kwcnt:
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   238
            return self.kwtemplater.expand(node, data)
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   239
        return self.kwtemplater.process(node, data)
144
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   240
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   241
    def add(self, text, meta, tr, link, p1=None, p2=None):
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   242
        '''Removes keyword substitutions when adding to filelog.'''
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   243
        text = self.kwtemplater.shrink(text)
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   244
        return super(kwfilelog, self).add(text, meta, tr, link, p1=p1, p2=p2)
144
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   245
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   246
    def cmp(self, node, text):
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   247
        '''Removes keyword substitutions for comparison.'''
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   248
        text = self.kwtemplater.shrink(text)
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   249
        if self.renamed(node):
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   250
            t2 = super(kwfilelog, self).read(node)
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   251
            return t2 != text
144
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   252
        return super(kwfilelog, self).cmp(node, text)
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   253
186
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   254
def overwrite(ui, repo, files=None, expand=True):
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   255
    '''Expands/shrinks keywords in working directory.'''
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   256
    wlock = repo.wlock()
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    try:
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        ctx = repo.changectx()
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        if not ctx:
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            raise hg.RepoError(_('no changeset found'))
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        for changed in repo.status()[:4]:
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            if changed:
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                raise util.Abort(_('local changes detected'))
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        kwfmatcher = keywordmatcher(ui, repo)
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        if kwfmatcher is None:
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            ui.warn(_('no files configured for keyword expansion\n'))
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            return
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        m = ctx.manifest()
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        if files:
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            files = [f for f in files if f in m.keys()]
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        else:
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            files = m.keys()
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        files = [f for f in files if kwfmatcher(f) and not os.path.islink(f)]
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        if not files:
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            ui.warn(_('given files not tracked or '
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                      'not configured for expansion\n'))
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            return
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        kwt = kwtemplater(ui, repo, node=ctx.node(), expand=expand)
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        kwt.overwrite(files, m, commit=False)
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    finally:
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        wlock.release()
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def shrink(ui, repo, *args):
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    '''revert expanded keywords in working directory
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    run before:
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               disabling keyword expansion
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               changing keyword expansion configuration
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    or if you experience problems with "hg import"
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    '''
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    overwrite(ui, repo, files=args, expand=False)
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def expand(ui, repo, *args):
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    '''expand keywords in working directory
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    run after (re)enabling keyword expansion
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    '''
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    overwrite(ui, repo, files=args)
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def demo(ui, repo, *args, **opts):
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    '''print [keywordmaps] configuration and an expansion example
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    show current, custom, or default keyword template maps and their expansion
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    '''
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    msg = 'hg keyword config and expansion example'
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    kwstatus = 'current'
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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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        if args or opts['rcfile']:
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            kwstatus = 'custom'
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        for tmap in args:
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            k, v = tmap.split('=', 1)
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            ui.setconfig('keywordmaps', k.strip(), v.strip())
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        if opts['rcfile']:
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            ui.readconfig(opts['rcfile'])
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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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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, kwcnt=False, kwexp=True):
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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, expand=kwexp)
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                return kwfilelog(self.sopener, f, kwt, kwcnt)
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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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   383
            if not wlock:
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   384
                wlock = self.wlock()
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   385
                wrelease = True
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   386
            try:
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   387
                removed = self.status(node1=p1, node2=p2, files=files,
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368fbd5b054c Reduce use of kwrepo methods
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   388
                                      match=match, wlock=wlock)[2]
145
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diff changeset
   389
166
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   390
                node = super(kwrepo,
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   391
                             self).commit(files=files, text=text, user=user,
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   392
                                          date=date, match=match, force=force,
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   393
                                          lock=lock, wlock=wlock,
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   394
                                          force_editor=force_editor,
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   395
                                          p1=p1, p2=p2, extra=extra)
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   396
                if node is None:
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   397
                    return node
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diff changeset
   398
177
261a6844145e wwread and wwrite methods for expansion in working dir
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   399
                cl = self.changelog.read(node)
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   400
                candidates = [f for f in cl[3] if kwfmatcher(f)
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diff changeset
   401
                              and f not in removed
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diff changeset
   402
                              and not os.path.islink(self.wjoin(f))]
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diff changeset
   403
                if candidates:
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parents: 184
diff changeset
   404
                    m = self.manifest.read(cl[0])
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diff changeset
   405
                    kwt = kwtemplater(ui, self, node=node)
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diff changeset
   406
                    kwt.overwrite(candidates, m)
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diff changeset
   407
                return node
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diff changeset
   408
            finally:
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diff changeset
   409
                if wrelease:
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diff changeset
   410
                    wlock.release()
129
15e8cd7f5295 Wrap commit instead of calling pretxncommit hook
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diff changeset
   411
33
ebb39c6a1476 Add original keyword extension by Thomas Arendsen Hain
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parents:
diff changeset
   412
    repo.__class__ = kwrepo
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diff changeset
   413
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   414
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   415
cmdtable = {
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   416
    'kwdemo':
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   417
        (demo,
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   418
         [('d', 'default', None, _('show default keyword template maps')),
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   419
          ('f', 'rcfile', [], _('read maps from RCFILE'))],
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diff changeset
   420
         _('hg kwdemo [-d || [-f RCFILE] TEMPLATEMAP ...]')),
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diff changeset
   421
    'kwshrink': (shrink, [], _('hg kwshrink [NAME] ...')),
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   422
    'kwexpand': (expand, [], _('hg kwexpand [NAME] ...')),
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diff changeset
   423
}