manifest: remove manifest.find

As part of removing dependencies on manifest, this drops the find function and
fixes up the two existing callers to use the equivalent apis on manifestctx.

mercurial/cmdutil.py

@@ -2566,11 +2566,14 b' def cat(ui, repo, ctx, matcher, prefix, '
     # for performance to avoid the cost of parsing the manifest.
     if len(matcher.files()) == 1 and not matcher.anypats():
         file = matcher.files()[0]
-        mf = repo.manifest
+        mfl = repo.manifestlog
         mfnode = ctx.manifestnode()
-        if mfnode and mf.find(mfnode, file)[0]:
+        try:
+            if mfnode and mfl[mfnode].find(file)[0]:
             write(file)
             return 0
+        except KeyError:
+            pass
 
     for abs in ctx.walk(matcher):
         write(abs)

mercurial/context.py

@@ -259,8 +259,10 b' class basectx(object):'
             if path in self._manifestdelta:
                 return (self._manifestdelta[path],
                         self._manifestdelta.flags(path))
-        node, flag = self._repo.manifest.find(self._changeset.manifest, path)
-        if not node:
+        mfl = self._repo.manifestlog
+        try:
+            node, flag = mfl[self._changeset.manifest].find(path)
+        except KeyError:
             raise error.ManifestLookupError(self._node, path,
                                             _('not found in manifest'))
 

mercurial/manifest.py

@@ -1394,6 +1394,9 b' class manifestctx(object):'
         d = mdiff.patchtext(revlog.revdiff(revlog.deltaparent(r), r))
         return manifestdict(d)
 
+    def find(self, key):
+        return self.read().find(key)
+
 class treemanifestctx(object):
     def __init__(self, repo, dir, node):
         self._repo = repo
@@ -1486,6 +1489,9 b' class treemanifestctx(object):'
         else:
             return self.read()
 
+    def find(self, key):
+        return self.read().find(key)
+
 class manifest(manifestrevlog):
     def __init__(self, opener, dir='', dirlogcache=None):
         '''The 'dir' and 'dirlogcache' arguments are for internal use by
@@ -1548,15 +1554,6 b' class manifest(manifestrevlog):'
             self.fulltextcache[node] = arraytext
         return m
 
-    def find(self, node, f):
-        '''look up entry for a single file efficiently.
-        return (node, flags) pair if found, (None, None) if not.'''
-        m = self.read(node)
-        try:
-            return m.find(f)
-        except KeyError:
-            return None, None
-
     def clearcaches(self):
         super(manifest, self).clearcaches()
         self._mancache.clear()