keyword: monkeypatch dispatch._parse to avoid redundant run

Inspired by Thomas Arendsen Hein.

hgext/keyword.py

@@ -1,524 +1,531 b''
 # keyword.py - $Keyword$ expansion for Mercurial
 #
 # Copyright 2007, 2008 Christian Ebert <[e-mail]>
 #
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 #
 # $Id$
 #
 # Keyword expansion hack against the grain of a DSCM
 #
 # There are many good reasons why this is not needed in a distributed
 # SCM, still it may be useful in very small projects based on single
 # files (like LaTeX packages), that are mostly addressed to an audience
 # not running a version control system.
 #
 # For in-depth discussion refer to
 # <http://www.selenic.com/mercurial/wiki/index.cgi/KeywordPlan>.
 #
 # Keyword expansion is based on Mercurial's changeset template mappings.
 #
 # Binary files are not touched.
 #
 # Setup in hgrc:
 #
 #   [extensions]
 #   # enable extension
 #   hgext.keyword =
 #
 # Files to act upon/ignore are specified in the [keyword] section.
 # Customized keyword template mappings in the [keywordmaps] section.
 #
 # Run "hg help keyword" and "hg kwdemo" to get info on configuration.
 
 '''keyword expansion in local repositories
 
 This extension expands RCS/CVS-like or self-customized $Keywords$
 in tracked text files selected by your configuration.
 
 Keywords are only expanded in local repositories and not stored in
 the change history. The mechanism can be regarded as a convenience
 for the current user or for archive distribution.
 
 Configuration is done in the [keyword] and [keywordmaps] sections
 of hgrc files.
 
 Example:
 
     [keyword]
     # expand keywords in every python file except those matching "x*"
     **.py =
     x*    = ignore
 
 Note: the more specific you are in your filename patterns
       the less you lose speed in huge repos.
 
 For [keywordmaps] template mapping and expansion demonstration and
 control run "hg kwdemo".
 
 An additional date template filter {date|utcdate} is provided.
 
 The default template mappings (view with "hg kwdemo -d") can be replaced
 with customized keywords and templates.
 Again, run "hg kwdemo" to control the results of your config changes.
 
 Before changing/disabling active keywords, run "hg kwshrink" to avoid
 the risk of inadvertedly storing expanded keywords in the change history.
 
 To force expansion after enabling it, or a configuration change, run
 "hg kwexpand".
 
 Also, when committing with the record extension or using mq's qrecord, be aware
 that keywords cannot be updated. Again, run "hg kwexpand" on the files in
 question to update keyword expansions after all changes have been checked in.
 
 Expansions spanning more than one line and incremental expansions,
 like CVS' $Log$, are not supported. A keyword template map
 "Log = {desc}" expands to the first line of the changeset description.
 '''
 
 from mercurial import commands, cmdutil, context, dispatch, filelog, revlog
 from mercurial import patch, localrepo, templater, templatefilters, util
 from mercurial.node import *
 from mercurial.i18n import _
-import re, shutil, sys, tempfile, time
+import re, shutil, tempfile, time
 
 commands.optionalrepo += ' kwdemo'
 
 # hg commands that do not act on keywords
 nokwcommands = ('add addremove bundle copy export grep identify incoming init'
                 ' log outgoing push remove rename rollback tip convert email')
 
 # hg commands that trigger expansion only when writing to working dir,
 # not when reading filelog, and unexpand when reading from working dir
 restricted = 'diff1 record qfold qimport qnew qpush qrefresh qrecord'
 
 def utcdate(date):
     '''Returns hgdate in cvs-like UTC format.'''
     return time.strftime('%Y/%m/%d %H:%M:%S', time.gmtime(date[0]))
 
 
-_kwtemplater = None
+_kwtemplater, _cmd, _cmdoptions = None, None, None
+ 
+# store originals of monkeypatches
+_patchfile_init = patch.patchfile.__init__
+_dispatch_parse = dispatch._parse
+
+def _kwpatchfile_init(self, ui, fname, missing=False):
+    '''Monkeypatch/wrap patch.patchfile.__init__ to avoid
+    rejects or conflicts due to expanded keywords in working dir.'''
+    _patchfile_init(self, ui, fname, missing=missing)
+    if _kwtemplater.matcher(self.fname):
+        # shrink keywords read from working dir
+        kwshrunk = _kwtemplater.shrink(''.join(self.lines))
+        self.lines = kwshrunk.splitlines(True)
+
+def _kwdispatch_parse(ui, args):
+    '''Monkeypatch dispatch._parse to obtain
+    current command and command options (global _cmd, _cmdoptions).'''
+    global _cmd, _cmdoptions
+    _cmd, func, args, options, _cmdoptions = _dispatch_parse(ui, args)
+    return _cmd, func, args, options, _cmdoptions
+
+dispatch._parse = _kwdispatch_parse
+
 
 class kwtemplater(object):
     '''
     Sets up keyword templates, corresponding keyword regex, and
     provides keyword substitution functions.
     '''
     templates = {
         'Revision': '{node|short}',
         'Author': '{author|user}',
         'Date': '{date|utcdate}',
         'RCSFile': '{file|basename},v',
         'Source': '{root}/{file},v',
         'Id': '{file|basename},v {node|short} {date|utcdate} {author|user}',
         'Header': '{root}/{file},v {node|short} {date|utcdate} {author|user}',
     }
 
     def __init__(self, ui, repo, inc, exc, restrict):
         self.ui = ui
         self.repo = repo
         self.matcher = util.matcher(repo.root, inc=inc, exc=exc)[1]
         self.restrict = restrict
         self.commitnode = None
         self.path = ''
 
         kwmaps = self.ui.configitems('keywordmaps')
         if kwmaps: # override default templates
             kwmaps = [(k, templater.parsestring(v, quoted=False))
                       for (k, v) in kwmaps]
             self.templates = dict(kwmaps)
         escaped = map(re.escape, self.templates.keys())
         kwpat = r'\$(%s)(: [^$\n\r]*? )??\$' % '|'.join(escaped)
         self.re_kw = re.compile(kwpat)
 
         templatefilters.filters['utcdate'] = utcdate
         self.ct = cmdutil.changeset_templater(self.ui, self.repo,
                                               False, '', False)
 
     def substitute(self, node, data, subfunc):
         '''Obtains file's changenode if commit node not given,
         and calls given substitution function.'''
         if self.commitnode:
             fnode = self.commitnode
         else:
             c = context.filectx(self.repo, self.path, fileid=node)
             fnode = c.node()
 
         def kwsub(mobj):
             '''Substitutes keyword using corresponding template.'''
             kw = mobj.group(1)
             self.ct.use_template(self.templates[kw])
             self.ui.pushbuffer()
             self.ct.show(changenode=fnode, root=self.repo.root, file=self.path)
             ekw = templatefilters.firstline(self.ui.popbuffer())
             return '$%s: %s $' % (kw, ekw)
 
         return subfunc(kwsub, data)
 
     def expand(self, node, data):
         '''Returns data with keywords expanded.'''
         if self.restrict or util.binary(data):
             return data
         return self.substitute(node, data, self.re_kw.sub)
 
     def process(self, node, data, expand):
         '''Returns a tuple: data, count.
         Count is number of keywords/keyword substitutions,
         telling caller whether to act on file containing data.'''
         if util.binary(data):
             return data, None
         if expand:
             return self.substitute(node, data, self.re_kw.subn)
         return data, self.re_kw.search(data)
 
     def shrink(self, text):
         '''Returns text with all keyword substitutions removed.'''
         if util.binary(text):
             return text
         return self.re_kw.sub(r'$\1$', text)
 
 class kwfilelog(filelog.filelog):
     '''
     Subclass of filelog to hook into its read, add, cmp methods.
     Keywords are "stored" unexpanded, and processed on reading.
     '''
     def __init__(self, opener, path):
         super(kwfilelog, self).__init__(opener, path)
         _kwtemplater.path = path
 
     def kwctread(self, node, expand):
         '''Reads expanding and counting keywords, called from _overwrite.'''
         data = super(kwfilelog, self).read(node)
         return _kwtemplater.process(node, data, expand)
 
     def read(self, node):
         '''Expands keywords when reading filelog.'''
         data = super(kwfilelog, self).read(node)
         return _kwtemplater.expand(node, data)
 
     def add(self, text, meta, tr, link, p1=None, p2=None):
         '''Removes keyword substitutions when adding to filelog.'''
         text = _kwtemplater.shrink(text)
         return super(kwfilelog, self).add(text, meta, tr, link, p1=p1, p2=p2)
 
     def cmp(self, node, text):
         '''Removes keyword substitutions for comparison.'''
         text = _kwtemplater.shrink(text)
         if self.renamed(node):
             t2 = super(kwfilelog, self).read(node)
             return t2 != text
         return revlog.revlog.cmp(self, node, text)
 
-
-# store original patch.patchfile.__init__
-_patchfile_init = patch.patchfile.__init__
-
-def _kwpatchfile_init(self, ui, fname, missing=False):
-    '''Monkeypatch/wrap patch.patchfile.__init__ to avoid
-    rejects or conflicts due to expanded keywords in working dir.'''
-    _patchfile_init(self, ui, fname, missing=missing)
-
-    if _kwtemplater.matcher(self.fname):
-        # shrink keywords read from working dir
-        kwshrunk = _kwtemplater.shrink(''.join(self.lines))
-        self.lines = kwshrunk.splitlines(True)
-
-
 def _iskwfile(f, link):
     return not link(f) and _kwtemplater.matcher(f)
 
 def _status(ui, repo, *pats, **opts):
     '''Bails out if [keyword] configuration is not active.
     Returns status of working directory.'''
     if _kwtemplater:
         files, match, anypats = cmdutil.matchpats(repo, pats, opts)
         return repo.status(files=files, match=match, list_clean=True)
     if ui.configitems('keyword'):
         raise util.Abort(_('[keyword] patterns cannot match'))
     raise util.Abort(_('no [keyword] patterns configured'))
 
 def _overwrite(ui, repo, node=None, expand=True, files=None):
     '''Overwrites selected files expanding/shrinking keywords.'''
     ctx = repo.changectx(node)
     mf = ctx.manifest()
     if node is not None:   # commit
         _kwtemplater.commitnode = node
         files = [f for f in ctx.files() if f in mf]
         notify = ui.debug
     else:                  # kwexpand/kwshrink
         notify = ui.note
     candidates = [f for f in files if _iskwfile(f, mf.linkf)]
     if candidates:
         candidates.sort()
         action = expand and 'expanding' or 'shrinking'
         for f in candidates:
             fp = repo.file(f, kwmatch=True)
             data, kwfound = fp.kwctread(mf[f], expand)
             if kwfound:
                 notify(_('overwriting %s %s keywords\n') % (f, action))
                 repo.wwrite(f, data, mf.flags(f))
                 repo.dirstate.normal(f)
 
 def _kwfwrite(ui, repo, expand, *pats, **opts):
     '''Selects files and passes them to _overwrite.'''
     status = _status(ui, repo, *pats, **opts)
     modified, added, removed, deleted, unknown, ignored, clean = status
     if modified or added or removed or deleted:
         raise util.Abort(_('outstanding uncommitted changes in given files'))
     wlock = lock = None
     try:
         wlock = repo.wlock()
         lock = repo.lock()
         _overwrite(ui, repo, expand=expand, files=clean)
     finally:
         del wlock, lock
 
 
 def demo(ui, repo, *args, **opts):
     '''print [keywordmaps] configuration and an expansion example
 
     Show current, custom, or default keyword template maps
     and their expansion.
 
     Extend current configuration by specifying maps as arguments
     and optionally by reading from an additional hgrc file.
 
     Override current keyword template maps with "default" option.
     '''
     def demostatus(stat):
         ui.status(_('\n\t%s\n') % stat)
 
     def demoitems(section, items):
         ui.write('[%s]\n' % section)
         for k, v in items:
             ui.write('%s = %s\n' % (k, v))
 
     msg = 'hg keyword config and expansion example'
     kwstatus = 'current'
     fn = 'demo.txt'
     branchname = 'demobranch'
     tmpdir = tempfile.mkdtemp('', 'kwdemo.')
     ui.note(_('creating temporary repo at %s\n') % tmpdir)
     repo = localrepo.localrepository(ui, path=tmpdir, create=True)
     ui.setconfig('keyword', fn, '')
     if args or opts.get('rcfile'):
         kwstatus = 'custom'
     if opts.get('rcfile'):
         ui.readconfig(opts.get('rcfile'))
     if opts.get('default'):
         kwstatus = 'default'
         kwmaps = kwtemplater.templates
         if ui.configitems('keywordmaps'):
             # override maps from optional rcfile
             for k, v in kwmaps.iteritems():
                 ui.setconfig('keywordmaps', k, v)
     elif args:
         # simulate hgrc parsing
         rcmaps = ['[keywordmaps]\n'] + [a + '\n' for a in args]
         fp = repo.opener('hgrc', 'w')
         fp.writelines(rcmaps)
         fp.close()
         ui.readconfig(repo.join('hgrc'))
     if not opts.get('default'):
         kwmaps = dict(ui.configitems('keywordmaps')) or kwtemplater.templates
     reposetup(ui, repo)
     for k, v in ui.configitems('extensions'):
         if k.endswith('keyword'):
             extension = '%s = %s' % (k, v)
             break
     demostatus('config using %s keyword template maps' % kwstatus)
     ui.write('[extensions]\n%s\n' % extension)
     demoitems('keyword', ui.configitems('keyword'))
     demoitems('keywordmaps', kwmaps.iteritems())
     keywords = '$' + '$\n$'.join(kwmaps.keys()) + '$\n'
     repo.wopener(fn, 'w').write(keywords)
     repo.add([fn])
     path = repo.wjoin(fn)
     ui.note(_('\n%s keywords written to %s:\n') % (kwstatus, path))
     ui.note(keywords)
     ui.note('\nhg -R "%s" branch "%s"\n' % (tmpdir, branchname))
     # silence branch command if not verbose
     quiet = ui.quiet
     ui.quiet = not ui.verbose
     commands.branch(ui, repo, branchname)
     ui.quiet = quiet
     for name, cmd in ui.configitems('hooks'):
         if name.split('.', 1)[0].find('commit') > -1:
             repo.ui.setconfig('hooks', name, '')
     ui.note(_('unhooked all commit hooks\n'))
     ui.note('hg -R "%s" ci -m "%s"\n' % (tmpdir, msg))
     repo.commit(text=msg)
     format = ui.verbose and ' in %s' % path or ''
     demostatus('%s keywords expanded%s' % (kwstatus, format))
     ui.write(repo.wread(fn))
     ui.debug(_('\nremoving temporary repo %s\n') % tmpdir)
     shutil.rmtree(tmpdir, ignore_errors=True)
 
 def expand(ui, repo, *pats, **opts):
     '''expand keywords in working directory
 
     Run after (re)enabling keyword expansion.
 
     kwexpand refuses to run if given files contain local changes.
     '''
     # 3rd argument sets expansion to True
     _kwfwrite(ui, repo, True, *pats, **opts)
 
 def files(ui, repo, *pats, **opts):
     '''print files currently configured for keyword expansion
 
     Crosscheck which files in working directory are potential targets for
     keyword expansion.
     That is, files matched by [keyword] config patterns but not symlinks.
     '''
     status = _status(ui, repo, *pats, **opts)
     modified, added, removed, deleted, unknown, ignored, clean = status
     files = modified + added + clean
     if opts.get('untracked'):
         files += unknown
     files.sort()
     kwfiles = [f for f in files if _iskwfile(f, repo._link)]
     cwd = pats and repo.getcwd() or ''
     kwfstats = not opts.get('ignore') and (('K', kwfiles),) or ()
     if opts.get('all') or opts.get('ignore'):
         kwfstats += (('I', [f for f in files if f not in kwfiles]),)
     for char, filenames in kwfstats:
         format = (opts.get('all') or ui.verbose) and '%s %%s\n' % char or '%s\n'
         for f in filenames:
             ui.write(format % repo.pathto(f, cwd))
 
 def shrink(ui, repo, *pats, **opts):
     '''revert expanded keywords in working directory
 
     Run before changing/disabling active keywords
     or if you experience problems with "hg import" or "hg merge".
 
     kwshrink refuses to run if given files contain local changes.
     '''
     # 3rd argument sets expansion to False
     _kwfwrite(ui, repo, False, *pats, **opts)
 
 
 def reposetup(ui, repo):
     '''Sets up repo as kwrepo for keyword substitution.
     Overrides file method to return kwfilelog instead of filelog
     if file matches user configuration.
     Wraps commit to overwrite configured files with updated
     keyword substitutions.
     This is done for local repos only, and only if there are
     files configured at all for keyword substitution.'''
 
+    global _kwtemplater
+    hgcmd, hgcmdopts = _cmd, _cmdoptions
+
     try:
-        if (not repo.local() or '.hg' in repo.root.split('/')
+        if (not repo.local() or hgcmd in nokwcommands.split() 
+            or '.hg' in repo.root.split('/')
             or repo._url.startswith('bundle:')):
             return
     except AttributeError:
         pass
 
-    hgcmd, func, args, opts, cmdopts = dispatch._parse(ui, sys.argv[1:])
-    if hgcmd in nokwcommands.split():
-        return
-
-    if hgcmd == 'diff':
-        # only expand if comparing against working dir
-        node1, node2 = cmdutil.revpair(repo, cmdopts.get('rev'))
-        if node2 is not None:
-            return
-        # shrink if rev is not current node
-        if node1 is not None and node1 != repo.changectx().node():
-            hgcmd = 'diff1'
-
     inc, exc = [], ['.hg*']
     for pat, opt in ui.configitems('keyword'):
         if opt != 'ignore':
             inc.append(pat)
         else:
             exc.append(pat)
     if not inc:
         return
 
-    global _kwtemplater
+    if hgcmd == 'diff':
+        # only expand if comparing against working dir
+        node1, node2 = cmdutil.revpair(repo, hgcmdopts.get('rev'))
+        if node2 is not None:
+            return
+        # shrink if rev is not current node
+        if node1 is not None and node1 != repo.changectx().node():
+            hgcmd = 'diff1'
+
     restrict = hgcmd in restricted.split()
     _kwtemplater = kwtemplater(ui, repo, inc, exc, restrict)
 
     class kwrepo(repo.__class__):
         def file(self, f, kwmatch=False):
             if f[0] == '/':
                 f = f[1:]
             if kwmatch or _kwtemplater.matcher(f):
                 return kwfilelog(self.sopener, f)
             return filelog.filelog(self.sopener, f)
 
         def wread(self, filename):
             data = super(kwrepo, self).wread(filename)
             if restrict and _kwtemplater.matcher(filename):
                 return _kwtemplater.shrink(data)
             return data
 
         def commit(self, files=None, text='', user=None, date=None,
                    match=util.always, force=False, force_editor=False,
                    p1=None, p2=None, extra={}, empty_ok=False):
             wlock = lock = None
             _p1 = _p2 = None
             try:
                 wlock = self.wlock()
                 lock = self.lock()
                 # store and postpone commit hooks
                 commithooks = {}
                 for name, cmd in ui.configitems('hooks'):
                     if name.split('.', 1)[0] == 'commit':
                         commithooks[name] = cmd
                         ui.setconfig('hooks', name, None)
                 if commithooks:
                     # store parents for commit hook environment
                     if p1 is None:
                         _p1, _p2 = repo.dirstate.parents()
                     else:
                         _p1, _p2 = p1, p2 or nullid
                     _p1 = hex(_p1)
                     if _p2 == nullid:
                         _p2 = ''
                     else:
                         _p2 = hex(_p2)
 
                 node = super(kwrepo,
                              self).commit(files=files, text=text, user=user,
                                           date=date, match=match, force=force,
                                           force_editor=force_editor,
                                           p1=p1, p2=p2, extra=extra,
                                           empty_ok=empty_ok)
 
                 # restore commit hooks
                 for name, cmd in commithooks.iteritems():
                     ui.setconfig('hooks', name, cmd)
                 if node is not None:
                     _overwrite(ui, self, node=node)
                     repo.hook('commit', node=node, parent1=_p1, parent2=_p2)
                 return node
             finally:
                 del wlock, lock
 
     repo.__class__ = kwrepo
     patch.patchfile.__init__ = _kwpatchfile_init
 
 
 cmdtable = {
     'kwdemo':
         (demo,
          [('d', 'default', None, _('show default keyword template maps')),
           ('f', 'rcfile', [], _('read maps from rcfile'))],
          _('hg kwdemo [-d] [-f RCFILE] [TEMPLATEMAP]...')),
     'kwexpand': (expand, commands.walkopts,
                  _('hg kwexpand [OPTION]... [FILE]...')),
     'kwfiles':
         (files,
          [('a', 'all', None, _('show keyword status flags of all files')),
           ('i', 'ignore', None, _('show files excluded from expansion')),
           ('u', 'untracked', None, _('additionally show untracked files')),
          ] + commands.walkopts,
          _('hg kwfiles [OPTION]... [FILE]...')),
     'kwshrink': (shrink, commands.walkopts,
                  _('hg kwshrink [OPTION]... [FILE]...')),
 }