hgext/hbisect.py
author Josef "Jeff" Sipek <jeffpc@josefsipek.net>
Tue, 29 May 2007 07:00:26 -0400
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# bisect extension for mercurial
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#
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# Copyright 2005, 2006 Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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# Inspired by git bisect, extension skeleton taken from mq.py.
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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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from mercurial.i18n import _
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from mercurial import hg, util, commands, cmdutil
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import os, sys, sets
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versionstr = "0.0.3"
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def lookup_rev(ui, repo, rev=None):
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    """returns rev or the checked-out revision if rev is None"""
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    if not rev is None:
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        return repo.lookup(rev)
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    parents = [p for p in repo.dirstate.parents() if p != hg.nullid]
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    if len(parents) != 1:
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        raise util.Abort(_("unexpected number of parents, "
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                           "please commit or revert"))
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    return parents.pop()
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def check_clean(ui, repo):
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    modified, added, removed, deleted, unknown = repo.status()[:5]
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    if modified or added or removed:
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        ui.warn("Repository is not clean, please commit or revert\n")
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        sys.exit(1)
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class bisect(object):
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    """dichotomic search in the DAG of changesets"""
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    def __init__(self, ui, repo):
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        self.repo = repo
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        self.path = repo.join("bisect")
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        self.opener = util.opener(self.path)
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        self.ui = ui
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        self.goodrevs = []
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        self.badrev = None
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        self.good_dirty = 0
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        self.bad_dirty = 0
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        self.good_path = "good"
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        self.bad_path = "bad"
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        if os.path.exists(os.path.join(self.path, self.good_path)):
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            self.goodrevs = self.opener(self.good_path).read().splitlines()
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            self.goodrevs = [hg.bin(x) for x in self.goodrevs]
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        if os.path.exists(os.path.join(self.path, self.bad_path)):
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            r = self.opener(self.bad_path).read().splitlines()
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            if r:
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                self.badrev = hg.bin(r.pop(0))
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    def write(self):
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        if not os.path.isdir(self.path):
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            return
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        f = self.opener(self.good_path, "w")
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        f.write("\n".join([hg.hex(r) for r in  self.goodrevs]))
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        if len(self.goodrevs) > 0:
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            f.write("\n")
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        f = self.opener(self.bad_path, "w")
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        if self.badrev:
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            f.write(hg.hex(self.badrev) + "\n")
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    def init(self):
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        """start a new bisection"""
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        if os.path.isdir(self.path):
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            raise util.Abort(_("bisect directory already exists\n"))
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        os.mkdir(self.path)
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        check_clean(self.ui, self.repo)
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        return 0
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    def reset(self):
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        """finish a bisection"""
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        if os.path.isdir(self.path):
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            sl = [os.path.join(self.path, p)
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                  for p in [self.bad_path, self.good_path]]
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            for s in sl:
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                if os.path.exists(s):
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                    os.unlink(s)
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            os.rmdir(self.path)
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        # Not sure about this
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        #self.ui.write("Going back to tip\n")
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        #self.repo.update(self.repo.changelog.tip())
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        return 1
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    def num_ancestors(self, head=None, stop=None):
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        """
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        returns a dict with the mapping:
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        node -> number of ancestors (self included)
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        for all nodes who are ancestor of head and
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        not in stop.
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        """
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        if head is None:
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            head = self.badrev
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        return self.__ancestors_and_nb_ancestors(head, stop)[1]
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    def ancestors(self, head=None, stop=None):
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        """
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        returns the set of the ancestors of head (self included)
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        who are not in stop.
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        """
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        if head is None:
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            head = self.badrev
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        return self.__ancestors_and_nb_ancestors(head, stop)[0]
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    def __ancestors_and_nb_ancestors(self, head, stop=None):
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        """
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        if stop is None then ancestors of goodrevs are used as
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        lower limit.
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        returns (anc, n_child) where anc is the set of the ancestors of head
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        and n_child is a dictionary with the following mapping:
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        node -> number of ancestors (self included)
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        """
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        cl = self.repo.changelog
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        if not stop:
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            stop = sets.Set([])
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            for i in xrange(len(self.goodrevs)-1, -1, -1):
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   119
                g = self.goodrevs[i]
1367
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parents:
diff changeset
   120
                if g in stop:
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   121
                    continue
a7678cbd7c28 bisect extension for mercurial
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parents:
diff changeset
   122
                stop.update(cl.reachable(g))
a7678cbd7c28 bisect extension for mercurial
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parents:
diff changeset
   123
        def num_children(a):
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parents:
diff changeset
   124
            """
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parents:
diff changeset
   125
            returns a dictionnary with the following mapping
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   126
            node -> [number of children, empty set]
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parents:
diff changeset
   127
            """
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   128
            d = {a: [0, sets.Set([])]}
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parents:
diff changeset
   129
            for i in xrange(cl.rev(a)+1):
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parents:
diff changeset
   130
                n = cl.node(i)
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parents:
diff changeset
   131
                if not d.has_key(n):
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parents:
diff changeset
   132
                    d[n] = [0, sets.Set([])]
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   133
                parents = [p for p in cl.parents(n) if p != hg.nullid]
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   134
                for p in parents:
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   135
                    d[p][0] += 1
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parents:
diff changeset
   136
            return d
1855
0ba9dee8cfbd Fixed spacing/indentation, removed #! script header, added short description.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1854
diff changeset
   137
1367
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   138
        if head in stop:
2348
1772852d7d14 better ui for the bisect extension
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parents: 2305
diff changeset
   139
            raise util.Abort(_("Unconsistent state, %s:%s is good and bad")
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parents: 2305
diff changeset
   140
                             % (cl.rev(head), hg.short(head)))
1367
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   141
        n_child = num_children(head)
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parents:
diff changeset
   142
        for i in xrange(cl.rev(head)+1):
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parents:
diff changeset
   143
            n = cl.node(i)
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parents:
diff changeset
   144
            parents = [p for p in cl.parents(n) if p != hg.nullid]
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   145
            for p in parents:
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   146
                n_child[p][0] -= 1
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parents:
diff changeset
   147
                if not n in stop:
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   148
                    n_child[n][1].union_update(n_child[p][1])
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parents:
diff changeset
   149
                if n_child[p][0] == 0:
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parents:
diff changeset
   150
                    n_child[p] = len(n_child[p][1])
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   151
            if not n in stop:
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   152
                n_child[n][1].add(n)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   153
            if n_child[n][0] == 0:
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   154
                if n == head:
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   155
                    anc = n_child[n][1]
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   156
                n_child[n] = len(n_child[n][1])
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   157
        return anc, n_child
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   158
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   159
    def next(self):
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parents:
diff changeset
   160
        if not self.badrev:
2348
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   161
            raise util.Abort(_("You should give at least one bad revision"))
1367
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   162
        if not self.goodrevs:
2348
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   163
            self.ui.warn(_("No good revision given\n"))
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   164
            self.ui.warn(_("Marking the first revision as good\n"))
1855
0ba9dee8cfbd Fixed spacing/indentation, removed #! script header, added short description.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1854
diff changeset
   165
        ancestors, num_ancestors = self.__ancestors_and_nb_ancestors(
0ba9dee8cfbd Fixed spacing/indentation, removed #! script header, added short description.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1854
diff changeset
   166
                                    self.badrev)
1367
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   167
        tot = len(ancestors)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   168
        if tot == 1:
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   169
            if ancestors.pop() != self.badrev:
2348
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   170
                raise util.Abort(_("Could not find the first bad revision"))
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   171
            self.ui.write(_("The first bad revision is:\n"))
3643
b4ad640a3bcf templates: move changeset templating bits to cmdutils
Matt Mackall <mpm@selenic.com>
parents: 2875
diff changeset
   172
            displayer = cmdutil.show_changeset(self.ui, self.repo, {})
2348
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   173
            displayer.show(changenode=self.badrev)
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   174
            return None
1367
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   175
        best_rev = None
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   176
        best_len = -1
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   177
        for n in ancestors:
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   178
            l = num_ancestors[n]
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   179
            l = min(l, tot - l)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   180
            if l > best_len:
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   181
                best_len = l
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   182
                best_rev = n
2348
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   183
        assert best_rev is not None
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   184
        nb_tests = 0
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   185
        q, r = divmod(tot, 2)
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   186
        while q:
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   187
            nb_tests += 1
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   188
            q, r = divmod(q, 2)
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   189
        msg = _("Testing changeset %s:%s (%s changesets remaining, "
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   190
                "~%s tests)\n") % (self.repo.changelog.rev(best_rev),
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   191
                                   hg.short(best_rev), tot, nb_tests)
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   192
        self.ui.write(msg)
1367
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   193
        return best_rev
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   194
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   195
    def autonext(self):
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   196
        """find and update to the next revision to test"""
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   197
        check_clean(self.ui, self.repo)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   198
        rev = self.next()
2348
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   199
        if rev is not None:
2808
30f59f4a327e Introduce update helper functions: update, merge, clean, and revert
Matt Mackall <mpm@selenic.com>
parents: 2805
diff changeset
   200
            return hg.clean(self.repo, rev)
1367
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   201
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   202
    def good(self, rev):
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   203
        self.goodrevs.append(rev)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   204
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   205
    def autogood(self, rev=None):
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   206
        """mark revision as good and update to the next revision to test"""
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   207
        check_clean(self.ui, self.repo)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   208
        rev = lookup_rev(self.ui, self.repo, rev)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   209
        self.good(rev)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   210
        if self.badrev:
2348
1772852d7d14 better ui for the bisect extension
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2305
diff changeset
   211
            return self.autonext()
1367
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   212
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   213
    def bad(self, rev):
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   214
        self.badrev = rev
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   215
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   216
    def autobad(self, rev=None):
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   217
        """mark revision as bad and update to the next revision to test"""
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   218
        check_clean(self.ui, self.repo)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   219
        rev = lookup_rev(self.ui, self.repo, rev)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   220
        self.bad(rev)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   221
        if self.goodrevs:
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   222
            self.autonext()
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   223
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   224
# should we put it in the class ?
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   225
def test(ui, repo, rev):
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   226
    """test the bisection code"""
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   227
    b = bisect(ui, repo)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   228
    rev = repo.lookup(rev)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   229
    ui.write("testing with rev %s\n" % hg.hex(rev))
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   230
    anc = b.ancestors()
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   231
    while len(anc) > 1:
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   232
        if not rev in anc:
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   233
            ui.warn("failure while bisecting\n")
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   234
            sys.exit(1)
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   235
        ui.write("it worked :)\n")
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   236
        new_rev = b.next()
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   237
        ui.write("choosing if good or bad\n")
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   238
        if rev in b.ancestors(head=new_rev):
a7678cbd7c28 bisect extension for mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   239
            b.bad(new_rev)
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            ui.write("it is bad\n")
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        else:
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            b.good(new_rev)
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            ui.write("it is good\n")
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        anc = b.ancestors()
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        #repo.update(new_rev, force=True)
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    for v in anc:
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        if v != rev:
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            ui.warn("fail to found cset! :(\n")
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            return 1
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    ui.write("Found bad cset: %s\n" % hg.hex(b.badrev))
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    ui.write("Everything is ok :)\n")
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    return 0
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def bisect_run(ui, repo, cmd=None, *args):
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    """Dichotomic search in the DAG of changesets
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This extension helps to find changesets which cause problems.
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To use, mark the earliest changeset you know introduces the problem
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as bad, then mark the latest changeset which is free from the problem
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as good. Bisect will update your working directory to a revision for
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testing. Once you have performed tests, mark the working directory
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as bad or good and bisect will either update to another candidate
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changeset or announce that it has found the bad revision.
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Note: bisect expects bad revisions to be descendants of good revisions.
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If you are looking for the point at which a problem was fixed, then make
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the problem-free state "bad" and the problematic state "good."
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For subcommands see "hg bisect help\"
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    """
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    def help_(cmd=None, *args):
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        """show help for a given bisect subcommand or all subcommands"""
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        cmdtable = bisectcmdtable
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        if cmd:
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            doc = cmdtable[cmd][0].__doc__
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            synopsis = cmdtable[cmd][2]
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            ui.write(synopsis + "\n")
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            ui.write("\n" + doc + "\n")
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            return
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        ui.write(_("list of subcommands for the bisect extension\n\n"))
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        cmds = cmdtable.keys()
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        cmds.sort()
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        m = max([len(c) for c in cmds])
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        for cmd in cmds:
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            doc = cmdtable[cmd][0].__doc__.splitlines(0)[0].rstrip()
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            ui.write(" %-*s   %s\n" % (m, cmd, doc))
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    b = bisect(ui, repo)
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    bisectcmdtable = {
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        "init": (b.init, 0, _("hg bisect init")),
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        "bad": (b.autobad, 1, _("hg bisect bad [<rev>]")),
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        "good": (b.autogood, 1, _("hg bisect good [<rev>]")),
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        "next": (b.autonext, 0, _("hg bisect next")),
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        "reset": (b.reset, 0, _("hg bisect reset")),
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        "help": (help_, 1, _("hg bisect help [<subcommand>]")),
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    }
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    if not bisectcmdtable.has_key(cmd):
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        ui.warn(_("bisect: Unknown sub-command\n"))
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        return help_()
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    if len(args) > bisectcmdtable[cmd][1]:
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        ui.warn(_("bisect: Too many arguments\n"))
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        return help_()
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    try:
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        return bisectcmdtable[cmd][0](*args)
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    finally:
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        b.write()
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cmdtable = {
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    "bisect": (bisect_run, [], _("hg bisect [help|init|reset|next|good|bad]")),
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    #"bisect-test": (test, [], "hg bisect-test rev"),
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}