hgext/convert/filemap.py
author Alexis S. L. Carvalho <alexis@cecm.usp.br>
Sat, 06 Oct 2007 15:30:15 -0300
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permissions -rw-r--r--
convert --filemap: reduce memory usage
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# Copyright 2007 Bryan O'Sullivan <bos@serpentine.com>
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# Copyright 2007 Alexis S. L. Carvalho <alexis@cecm.usp.br>
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#
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# This software may be used and distributed according to the terms of
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# the GNU General Public License, incorporated herein by reference.
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import shlex
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from mercurial.i18n import _
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from mercurial import util
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from common import SKIPREV
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def rpairs(name):
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    e = len(name)
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    while e != -1:
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        yield name[:e], name[e+1:]
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        e = name.rfind('/', 0, e)
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class filemapper(object):
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    '''Map and filter filenames when importing.
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    A name can be mapped to itself, a new name, or None (omit from new
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    repository).'''
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    def __init__(self, ui, path=None):
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        self.ui = ui
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        self.include = {}
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        self.exclude = {}
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        self.rename = {}
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        if path:
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            if self.parse(path):
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                raise util.Abort(_('errors in filemap'))
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    def parse(self, path):
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        errs = 0
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        def check(name, mapping, listname):
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            if name in mapping:
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                self.ui.warn(_('%s:%d: %r already in %s list\n') %
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                             (lex.infile, lex.lineno, name, listname))
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                return 1
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            return 0
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        lex = shlex.shlex(open(path), path, True)
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        lex.wordchars += '!@#$%^&*()-=+[]{}|;:,./<>?'
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        cmd = lex.get_token()
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        while cmd:
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            if cmd == 'include':
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                name = lex.get_token()
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                errs += check(name, self.exclude, 'exclude')
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                self.include[name] = name
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            elif cmd == 'exclude':
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                name = lex.get_token()
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                errs += check(name, self.include, 'include')
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                errs += check(name, self.rename, 'rename')
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                self.exclude[name] = name
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            elif cmd == 'rename':
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                src = lex.get_token()
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                dest = lex.get_token()
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                errs += check(src, self.exclude, 'exclude')
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                self.rename[src] = dest
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            elif cmd == 'source':
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                errs += self.parse(lex.get_token())
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            else:
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                self.ui.warn(_('%s:%d: unknown directive %r\n') %
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                             (lex.infile, lex.lineno, cmd))
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                errs += 1
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            cmd = lex.get_token()
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        return errs
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    def lookup(self, name, mapping):
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        for pre, suf in rpairs(name):
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            try:
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                return mapping[pre], pre, suf
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            except KeyError, err:
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                pass
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        return '', name, ''
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    def __call__(self, name):
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        if self.include:
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            inc = self.lookup(name, self.include)[0]
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        else:
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            inc = name
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        if self.exclude:
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            exc = self.lookup(name, self.exclude)[0]
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        else:
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            exc = ''
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        if not inc or exc:
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            return None
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        newpre, pre, suf = self.lookup(name, self.rename)
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        if newpre:
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            if newpre == '.':
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                return suf
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            if suf:
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                return newpre + '/' + suf
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            return newpre
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        return name
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    def active(self):
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        return bool(self.include or self.exclude or self.rename)
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# This class does two additional things compared to a regular source:
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#
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# - Filter and rename files.  This is mostly wrapped by the filemapper
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#   class above. We hide the original filename in the revision that is
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#   returned by getchanges to be able to find things later in getfile
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#   and getmode.
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#
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# - Return only revisions that matter for the files we're interested in.
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#   This involves rewriting the parents of the original revision to
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#   create a graph that is restricted to those revisions.
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#
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#   This set of revisions includes not only revisions that directly
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#   touch files we're interested in, but also merges that merge two
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#   or more interesting revisions.
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class filemap_source(object):
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    def __init__(self, ui, baseconverter, filemap):
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        self.ui = ui
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        self.base = baseconverter
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        self.filemapper = filemapper(ui, filemap)
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        self.commits = {}
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        # if a revision rev has parent p in the original revision graph, then
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        # rev will have parent self.parentmap[p] in the restricted graph.
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        self.parentmap = {}
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        # self.wantedancestors[rev] is the set of all ancestors of rev that
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        # are in the restricted graph.
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        self.wantedancestors = {}
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        self.convertedorder = None
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        self._rebuilt = False
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        self.origparents = {}
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        self.children = {}
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        self.seenchildren = {}
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   130
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    def setrevmap(self, revmap, order):
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        # rebuild our state to make things restartable
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   133
        #
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        # To avoid calling getcommit for every revision that has already
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        # been converted, we rebuild only the parentmap, delaying the
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        # rebuild of wantedancestors until we need it (i.e. until a
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        # merge).
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   138
        #
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        # We assume the order argument lists the revisions in
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        # topological order, so that we can infer which revisions were
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   141
        # wanted by previous runs.
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        self._rebuilt = not revmap
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        seen = {SKIPREV: SKIPREV}
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        dummyset = util.set()
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        converted = []
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        for rev in order:
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            mapped = revmap[rev]
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            wanted = mapped not in seen
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            if wanted:
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                seen[mapped] = rev
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                self.parentmap[rev] = rev
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            else:
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                self.parentmap[rev] = seen[mapped]
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            self.wantedancestors[rev] = dummyset
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   155
            arg = seen[mapped]
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            if arg == SKIPREV:
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                arg = None
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            converted.append((rev, wanted, arg))
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        self.convertedorder = converted
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        return self.base.setrevmap(revmap, order)
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   161
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    def rebuild(self):
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   163
        if self._rebuilt:
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            return True
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        self._rebuilt = True
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        self.parentmap.clear()
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        self.wantedancestors.clear()
5401
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        self.seenchildren.clear()
5377
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        for rev, wanted, arg in self.convertedorder:
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            if rev not in self.origparents:
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   171
                self.origparents[rev] = self.getcommit(rev).parents
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            if arg is not None:
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                self.children[arg] = self.children.get(arg, 0) + 1
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        for rev, wanted, arg in self.convertedorder:
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            parents = self.origparents[rev]
5377
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            if wanted:
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                self.mark_wanted(rev, parents)
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            else:
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                self.mark_not_wanted(rev, arg)
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            self._discard(arg, *parents)
5377
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   182
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        return True
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   184
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    def getheads(self):
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   186
        return self.base.getheads()
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   187
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   188
    def getcommit(self, rev):
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        # We want to save a reference to the commit objects to be able
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        # to rewrite their parents later on.
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        c = self.commits[rev] = self.base.getcommit(rev)
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        for p in c.parents:
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   193
            self.children[p] = self.children.get(p, 0) + 1
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        return c
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   195
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    def _discard(self, *revs):
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   197
        for r in revs:
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   198
            if r is None:
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                continue
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            self.seenchildren[r] = self.seenchildren.get(r, 0) + 1
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   201
            if self.seenchildren[r] == self.children[r]:
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                del self.wantedancestors[r]
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                del self.parentmap[r]
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                del self.seenchildren[r]
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                if self._rebuilt:
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                    del self.children[r]
5377
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   207
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    def wanted(self, rev, i):
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        # Return True if we're directly interested in rev.
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   210
        #
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        # i is an index selecting one of the parents of rev (if rev
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   212
        # has no parents, i is None).  getchangedfiles will give us
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   213
        # the list of files that are different in rev and in the parent
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   214
        # indicated by i.  If we're interested in any of these files,
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   215
        # we're interested in rev.
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   216
        try:
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            files = self.base.getchangedfiles(rev, i)
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   218
        except NotImplementedError:
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            raise util.Abort(_("source repository doesn't support --filemap"))
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        for f in files:
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   221
            if self.filemapper(f):
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   222
                return True
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   223
        return False
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   224
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   225
    def mark_not_wanted(self, rev, p):
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        # Mark rev as not interesting and update data structures.
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   227
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   228
        if p is None:
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   229
            # A root revision. Use SKIPREV to indicate that it doesn't
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   230
            # map to any revision in the restricted graph.  Put SKIPREV
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   231
            # in the set of wanted ancestors to simplify code elsewhere
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   232
            self.parentmap[rev] = SKIPREV
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   233
            self.wantedancestors[rev] = util.set((SKIPREV,))
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   234
            return
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   235
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   236
        # Reuse the data from our parent.
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        self.parentmap[rev] = self.parentmap[p]
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   238
        self.wantedancestors[rev] = self.wantedancestors[p]
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   239
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   240
    def mark_wanted(self, rev, parents):
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   241
        # Mark rev ss wanted and update data structures.
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   242
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        # rev will be in the restricted graph, so children of rev in
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   244
        # the original graph should still have rev as a parent in the
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   245
        # restricted graph.
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   246
        self.parentmap[rev] = rev
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   247
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        # The set of wanted ancestors of rev is the union of the sets
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   249
        # of wanted ancestors of its parents. Plus rev itself.
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   250
        wrev = util.set()
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   251
        for p in parents:
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   252
            wrev.update(self.wantedancestors[p])
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        wrev.add(rev)
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   254
        self.wantedancestors[rev] = wrev
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   255
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   256
    def getchanges(self, rev):
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parents: 5376
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   257
        parents = self.commits[rev].parents
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   258
        if len(parents) > 1:
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   259
            self.rebuild()
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   260
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   261
        # To decide whether we're interested in rev we:
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   262
        #
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   263
        # - calculate what parents rev will have if it turns out we're
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   264
        #   interested in it.  If it's going to have more than 1 parent,
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   265
        #   we're interested in it.
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   266
        #
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   267
        # - otherwise, we'll compare it with the single parent we found.
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   268
        #   If any of the files we're interested in is different in the
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   269
        #   the two revisions, we're interested in rev.
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   270
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   271
        # A parent p is interesting if its mapped version (self.parentmap[p]):
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   272
        # - is not SKIPREV
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   273
        # - is still not in the list of parents (we don't want duplicates)
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   274
        # - is not an ancestor of the mapped versions of the other parents
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   275
        mparents = []
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
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   276
        wp = None
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   277
        for i, p1 in enumerate(parents):
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   278
            mp1 = self.parentmap[p1]
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   279
            if mp1 == SKIPREV or mp1 in mparents:
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   280
                continue
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   281
            for p2 in parents:
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   282
                if p1 == p2 or mp1 == self.parentmap[p2]:
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   283
                    continue
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   284
                if mp1 in self.wantedancestors[p2]:
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   285
                    break
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   286
            else:
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   287
                mparents.append(mp1)
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   288
                wp = i
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   289
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   290
        if wp is None and parents:
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   291
            wp = 0
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   292
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   293
        self.origparents[rev] = parents
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   294
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   295
        if len(mparents) < 2 and not self.wanted(rev, wp):
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   296
            # We don't want this revision.
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   297
            # Update our state and tell the convert process to map this
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   298
            # revision to the same revision its parent as mapped to.
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   299
            p = None
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   300
            if parents:
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   301
                p = parents[wp]
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   302
            self.mark_not_wanted(rev, p)
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   303
            self.convertedorder.append((rev, False, p))
5401
4c555dd167dd convert --filemap: reduce memory usage
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5377
diff changeset
   304
            self._discard(*parents)
5377
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   305
            return self.parentmap[rev]
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   306
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   307
        # We want this revision.
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   308
        # Rewrite the parents of the commit object
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   309
        self.commits[rev].parents = mparents
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   310
        self.mark_wanted(rev, parents)
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   311
        self.convertedorder.append((rev, True, None))
5401
4c555dd167dd convert --filemap: reduce memory usage
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5377
diff changeset
   312
        self._discard(*parents)
5377
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   313
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   314
        # Get the real changes and do the filtering/mapping.
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   315
        # To be able to get the files later on in getfile and getmode,
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   316
        # we hide the original filename in the rev part of the return
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   317
        # value.
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   318
        changes, copies = self.base.getchanges(rev)
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   319
        newnames = {}
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   320
        files = []
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   321
        for f, r in changes:
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   322
            newf = self.filemapper(f)
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   323
            if newf:
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   324
                files.append((newf, (f, r)))
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   325
                newnames[f] = newf
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   326
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   327
        ncopies = {}
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   328
        for c in copies:
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   329
            newc = self.filemapper(c)
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   330
            if newc:
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   331
                newsource = self.filemapper(copies[c])
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   332
                if newsource:
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   333
                    ncopies[newc] = newsource
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   334
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   335
        return files, ncopies
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   336
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   337
    def getfile(self, name, rev):
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   338
        realname, realrev = rev
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   339
        return self.base.getfile(realname, realrev)
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   340
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   341
    def getmode(self, name, rev):
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   342
        realname, realrev = rev
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   343
        return self.base.getmode(realname, realrev)
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   344
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   345
    def gettags(self):
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   346
        return self.base.gettags()
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   347
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   348
    def before(self):
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   349
        pass
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   350
756a43a30e34 convert: readd --filemap
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   351
    def after(self):
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5376
diff changeset
   352
        pass