# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 1534817112 -7200
# Node ID 7b1af75e12a9ae25813dacff89a577ac504ca722
# Parent  68d414cde57912dcdaba21565d3ce06089077cc9
compat: import the module dagutil module in evolve

Discovery code is core have been rewritten to no longer depends on dagutil and
the module have been removed.

This break evolve's obsmarker discovery (older version of the discovery use the
same concept).. A quick work around is to import the dagutil module in evolve
and use that for now.

diff -r 68d414cde579 -r 7b1af75e12a9 hgext3rd/evolve/dagutil.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hgext3rd/evolve/dagutil.py	Tue Aug 21 04:05:12 2018 +0200
@@ -0,0 +1,287 @@
+# dagutil.py - dag utilities for mercurial
+#
+# Copyright 2010 Benoit Boissinot <bboissin@gmail.com>
+# and Peter Arrenbrecht <peter@arrenbrecht.ch>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+#
+# Imported from Mercurial code at cee9043c7dba
+
+from __future__ import absolute_import
+
+from mercurial.i18n import _
+from mercurial.node import nullrev
+
+class basedag(object):
+    '''generic interface for DAGs
+
+    terms:
+    "ix" (short for index) identifies a nodes internally,
+    "id" identifies one externally.
+
+    All params are ixs unless explicitly suffixed otherwise.
+    Pluralized params are lists or sets.
+    '''
+
+    def __init__(self):
+        self._inverse = None
+
+    def nodeset(self):
+        '''set of all node ixs'''
+        raise NotImplementedError
+
+    def heads(self):
+        '''list of head ixs'''
+        raise NotImplementedError
+
+    def parents(self, ix):
+        '''list of parents ixs of ix'''
+        raise NotImplementedError
+
+    def inverse(self):
+        '''inverse DAG, where parents becomes children, etc.'''
+        raise NotImplementedError
+
+    def ancestorset(self, starts, stops=None):
+        '''
+        set of all ancestors of starts (incl), but stop walk at stops (excl)
+        '''
+        raise NotImplementedError
+
+    def descendantset(self, starts, stops=None):
+        '''
+        set of all descendants of starts (incl), but stop walk at stops (excl)
+        '''
+        return self.inverse().ancestorset(starts, stops)
+
+    def headsetofconnecteds(self, ixs):
+        '''
+        subset of connected list of ixs so that no node has a descendant in it
+
+        By "connected list" we mean that if an ancestor and a descendant are in
+        the list, then so is at least one path connecting them.
+        '''
+        raise NotImplementedError
+
+    def externalize(self, ix):
+        '''return a node id'''
+        return self._externalize(ix)
+
+    def externalizeall(self, ixs):
+        '''return a list of (or set if given a set) of node ids'''
+        ids = self._externalizeall(ixs)
+        if isinstance(ixs, set):
+            return set(ids)
+        return list(ids)
+
+    def internalize(self, id):
+        '''return a node ix'''
+        return self._internalize(id)
+
+    def internalizeall(self, ids, filterunknown=False):
+        '''return a list of (or set if given a set) of node ixs'''
+        ixs = self._internalizeall(ids, filterunknown)
+        if isinstance(ids, set):
+            return set(ixs)
+        return list(ixs)
+
+class genericdag(basedag):
+    '''generic implementations for DAGs'''
+
+    def ancestorset(self, starts, stops=None):
+        if stops:
+            stops = set(stops)
+        else:
+            stops = set()
+        seen = set()
+        pending = list(starts)
+        while pending:
+            n = pending.pop()
+            if n not in seen and n not in stops:
+                seen.add(n)
+                pending.extend(self.parents(n))
+        return seen
+
+    def headsetofconnecteds(self, ixs):
+        hds = set(ixs)
+        if not hds:
+            return hds
+        for n in ixs:
+            for p in self.parents(n):
+                hds.discard(p)
+        assert hds
+        return hds
+
+class revlogbaseddag(basedag):
+    '''generic dag interface to a revlog'''
+
+    def __init__(self, revlog, nodeset):
+        basedag.__init__(self)
+        self._revlog = revlog
+        self._heads = None
+        self._nodeset = nodeset
+
+    def nodeset(self):
+        return self._nodeset
+
+    def heads(self):
+        if self._heads is None:
+            self._heads = self._getheads()
+        return self._heads
+
+    def _externalize(self, ix):
+        return self._revlog.index[ix][7]
+
+    def _externalizeall(self, ixs):
+        idx = self._revlog.index
+        return [idx[i][7] for i in ixs]
+
+    def _internalize(self, id):
+        ix = self._revlog.rev(id)
+        if ix == nullrev:
+            raise LookupError(id, self._revlog.indexfile, _('nullid'))
+        return ix
+
+    def _internalizeall(self, ids, filterunknown):
+        rl = self._revlog
+        if filterunknown:
+            return [r for r in map(rl.nodemap.get, ids)
+                    if (r is not None
+                        and r != nullrev
+                        and r not in rl.filteredrevs)]
+        return [self._internalize(i) for i in ids]
+
+class revlogdag(revlogbaseddag):
+    '''dag interface to a revlog'''
+
+    def __init__(self, revlog, localsubset=None):
+        revlogbaseddag.__init__(self, revlog, set(revlog))
+        self._heads = localsubset
+
+    def _getheads(self):
+        return [r for r in self._revlog.headrevs() if r != nullrev]
+
+    def parents(self, ix):
+        rlog = self._revlog
+        idx = rlog.index
+        revdata = idx[ix]
+        prev = revdata[5]
+        if prev != nullrev:
+            prev2 = revdata[6]
+            if prev2 == nullrev:
+                return [prev]
+            return [prev, prev2]
+        prev2 = revdata[6]
+        if prev2 != nullrev:
+            return [prev2]
+        return []
+
+    def inverse(self):
+        if self._inverse is None:
+            self._inverse = inverserevlogdag(self)
+        return self._inverse
+
+    def ancestorset(self, starts, stops=None):
+        rlog = self._revlog
+        idx = rlog.index
+        if stops:
+            stops = set(stops)
+        else:
+            stops = set()
+        seen = set()
+        pending = list(starts)
+        while pending:
+            rev = pending.pop()
+            if rev not in seen and rev not in stops:
+                seen.add(rev)
+                revdata = idx[rev]
+                for i in [5, 6]:
+                    prev = revdata[i]
+                    if prev != nullrev:
+                        pending.append(prev)
+        return seen
+
+    def headsetofconnecteds(self, ixs):
+        if not ixs:
+            return set()
+        rlog = self._revlog
+        idx = rlog.index
+        headrevs = set(ixs)
+        for rev in ixs:
+            revdata = idx[rev]
+            for i in [5, 6]:
+                prev = revdata[i]
+                if prev != nullrev:
+                    headrevs.discard(prev)
+        assert headrevs
+        return headrevs
+
+    def linearize(self, ixs):
+        '''linearize and topologically sort a list of revisions
+
+        The linearization process tries to create long runs of revs where
+        a child rev comes immediately after its first parent. This is done by
+        visiting the heads of the given revs in inverse topological order,
+        and for each visited rev, visiting its second parent, then its first
+        parent, then adding the rev itself to the output list.
+        '''
+        sorted = []
+        visit = list(self.headsetofconnecteds(ixs))
+        visit.sort(reverse=True)
+        finished = set()
+
+        while visit:
+            cur = visit.pop()
+            if cur < 0:
+                cur = -cur - 1
+                if cur not in finished:
+                    sorted.append(cur)
+                    finished.add(cur)
+            else:
+                visit.append(-cur - 1)
+                visit += [p for p in self.parents(cur)
+                          if p in ixs and p not in finished]
+        assert len(sorted) == len(ixs)
+        return sorted
+
+class inverserevlogdag(revlogbaseddag, genericdag):
+    '''inverse of an existing revlog dag; see revlogdag.inverse()'''
+
+    def __init__(self, orig):
+        revlogbaseddag.__init__(self, orig._revlog, orig._nodeset)
+        self._orig = orig
+        self._children = {}
+        self._roots = []
+        self._walkfrom = len(self._revlog) - 1
+
+    def _walkto(self, walkto):
+        rev = self._walkfrom
+        cs = self._children
+        roots = self._roots
+        idx = self._revlog.index
+        while rev >= walkto:
+            data = idx[rev]
+            isroot = True
+            for prev in [data[5], data[6]]: # parent revs
+                if prev != nullrev:
+                    cs.setdefault(prev, []).append(rev)
+                    isroot = False
+            if isroot:
+                roots.append(rev)
+            rev -= 1
+        self._walkfrom = rev
+
+    def _getheads(self):
+        self._walkto(nullrev)
+        return self._roots
+
+    def parents(self, ix):
+        if ix is None:
+            return []
+        if ix <= self._walkfrom:
+            self._walkto(ix)
+        return self._children.get(ix, [])
+
+    def inverse(self):
+        return self._orig
diff -r 68d414cde579 -r 7b1af75e12a9 hgext3rd/evolve/obsdiscovery.py
--- a/hgext3rd/evolve/obsdiscovery.py	Sat Aug 18 01:32:52 2018 +0200
+++ b/hgext3rd/evolve/obsdiscovery.py	Tue Aug 21 04:05:12 2018 +0200
@@ -29,7 +29,6 @@
 import weakref
 
 from mercurial import (
-    dagutil,
     error,
     exchange,
     extensions,
@@ -60,6 +59,12 @@
     wireprotov1server = wireprototypes
     from mercurial.wireproto import wirepeer, encodelist, decodelist
 
+try:
+    from mercurial import dagutil
+    dagutil.revlogdag
+except (ImportError, AttributeError): # <= hg-4.7
+    from . import dagutil
+
 _pack = struct.pack
 _unpack = struct.unpack
 _calcsize = struct.calcsize