hgkw/keyword.py
author Christian Ebert <blacktrash@gmx.net>
Fri, 05 Jan 2007 14:51:58 +0100
branchsolo-extension
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# keyword.py - keyword expansion for mercurial
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'''keyword expansion hack against the grain of a DSCM
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This extension lets you expand RCS/CVS-like keywords in a Mercurial
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repository.
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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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Supported keywords are (changeset 000000000000):
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    $Revision: 000000000000 $
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    $Author: Your Name <address@example.com> $
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    $Date: %a %b %d %H:%M:%S %Y %z $
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    $RCSFile: basename,v $
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    $Source: /path/to/basename,v $
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    $Id: basename,v 000000000000 %Y-%m-%d %H:%M:%S %z shortname $
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    $Header: /path/to/basename,v 000000000000 %Y-%m-%d %H:%M:%S %z shortname $
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The extension, according to its hackish nature, is a hybrid and consists
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actually in 2 parts:
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    1. pure extension code (reposetup) that is triggered on checkout and
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       logging of changes.
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    2. a pretxncommit hook (hgrc (5)) that expands keywords immediately
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       at commit time in the working directory.
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Simple setup in hgrc:
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    # enable extension
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    hgext.keyword =
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    # filename patterns for expansion are configured in this section
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    [keyword]
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    *.sty = expand
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    ...
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    # set up pretxncommit hook
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    [hooks]
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    pretxncommit =
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    pretxncommit.keyword = python:hgext.keyword.pretxnkw
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'''
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from mercurial.i18n import _
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from mercurial import context, util
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import os.path, re
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re_kw = re.compile(
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        r'\$(Id|Header|Author|Date|Revision|RCSFile|Source)[^$]*?\$')
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def kwexpand(matchobj, repo, path, changeid=None, fileid=None, filelog=None):
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    '''Called by kwfilelog.read and pretxnkw.
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    Sets supported keywords as local variables and evaluates them to
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    their expansion if matchobj is equal to string representation.'''
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    c = context.filectx(repo, path,
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            changeid=changeid, fileid=fileid, filelog=filelog)
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    date = c.date()
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    Revision = c.changectx()
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    Author = c.user()
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    RCSFile = os.path.basename(path)+',v'
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    Source = repo.wjoin(path)+',v'
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    Date = util.datestr(date=date)
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    revdateauth = '%s %s %s' % (Revision,
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            util.datestr(date=date, format=util.defaultdateformats[0]),
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            util.shortuser(Author))
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    Header = '%s %s' % (Source, revdateauth)
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    Id = '%s %s' % (RCSFile, revdateauth)
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    return '$%s: %s $' % (matchobj.group(1), eval(matchobj.group(1)))
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def kwfmatchers(ui, repo):
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    '''Returns filename matchers from ui keyword section.'''
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    return [util.matcher(repo.root, '', [pat], [], [])[1]
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            for pat, opt in ui.configitems('keyword')
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            if opt == 'expand']
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def reposetup(ui, repo):
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    from mercurial import filelog, revlog
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    if not repo.local():
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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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            return filelog.filelog(self.sopener, f, self, self.revlogversion)
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    class kwfilelog(filelog.filelog):
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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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        def read(self, node):
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            data = super(kwfilelog, self).read(node)
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            if not self._path.startswith('.hg') and not util.binary(data):
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                for mf in kwfmatchers(ui, self._repo):
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                    if mf(self._path):
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                        ui.debug(_('expanding keywords in %s\n' % self._path))
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                        return re_kw.sub(lambda m:
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                                kwexpand(m, self._repo, self._path,
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                                    fileid=node, filelog=self),
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                                data)
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            return data
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        def size(self, rev):
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            '''Overrides filelog's size() to use kwfilelog.read().'''
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            node = revlog.node(self, rev)
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            if super(kwfilelog, self).renamed(node):
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                return len(self.read(node))
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            return revlog.size(self, rev)
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        def cmp(self, node, text):
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            '''Overrides filelog's cmp() to use kwfilelog.read().'''
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            if super(kwfilelog, self).renamed(node):
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                t2 = self.read(node)
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                return t2 != text
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    filelog.filelog = kwfilelog
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    repo.__class__ = kwrepo
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def pretxnkw(ui, repo, hooktype, **args):
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    '''pretxncommit hook that collects candidates for keyword expansion
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    on commit and expands keywords in working dir.'''
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    from mercurial import cmdutil, commands
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    import sys
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    if hooktype != 'pretxncommit':
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        return True
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    cmd, sysargs, globalopts, cmdopts = commands.parse(ui, sys.argv[1:])[1:]
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    if repr(cmd).split()[1] in ('tag', 'import_'):
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        return False
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    files, match, anypats = cmdutil.matchpats(repo, sysargs, cmdopts)
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    modified, added = repo.status(files=files, match=match)[:2]
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    candidates = [f for f in modified + added if not f.startswith('.hg')]
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    if not candidates:
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        return False
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    fmatchers = kwfmatchers(ui, repo)
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    for f in candidates:
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        for mf in fmatchers:
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            if mf(f):
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                data = repo.wfile(f).read()
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                if not util.binary(data):
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                    data, kwct = re_kw.subn(lambda m:
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                            kwexpand(m, repo, f, changeid=args['node']),
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                            data)
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                    if kwct:
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                        ui.debug(_('overwriting %s expanding keywords\n' % f))
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                        repo.wfile(f, 'w').write(data)
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                break