context: remove uses of manifest.matches

context: remove uses of manifest.matches

This removes the uses of manifest.matches in context.py in favor of the new
manifest.diff(match) api. This is part of removing manifest.matches since it is
O(manifest).

To drop the dependency on ctx._manifestmatches(s) we transfer responsibilty for
creating status oriented manifests over to ctx._buildstatusmanifest(s). This
already existed for workingctx, we just need to implement a simple version for
basectx. The old _manifestmatches functionality is basically identical to the
_buildstatusmanifest functionality (minus the matching part), so no behavior
should be lost.

--- a/mercurial/context.py	Tue Mar 07 17:49:50 2017 -0800
+++ b/mercurial/context.py	Tue Mar 07 17:52:45 2017 -0800
@@ -18,7 +18,6 @@
     bin,
     hex,
     modifiednodeid,
-    newnodeid,
     nullid,
     nullrev,
     short,
@@ -91,14 +90,11 @@
     def __iter__(self):
         return iter(self._manifest)
 
-    def _manifestmatches(self, match, s):
-        """generate a new manifest filtered by the match argument
-
-        This method is for internal use only and mainly exists to provide an
-        object oriented way for other contexts to customize the manifest
-        generation.
-        """
-        return self.manifest().matches(match)
+    def _buildstatusmanifest(self, status):
+        """Builds a manifest that includes the given status results, if this is
+        a working copy context. For non-working copy contexts, it just returns
+        the normal manifest."""
+        return self.manifest()
 
     def _matchstatus(self, other, match):
         """return match.always if match is none
@@ -119,17 +115,17 @@
         # delta application.
         mf2 = None
         if self.rev() is not None and self.rev() < other.rev():
-            mf2 = self._manifestmatches(match, s)
-        mf1 = other._manifestmatches(match, s)
+            mf2 = self._buildstatusmanifest(s)
+        mf1 = other._buildstatusmanifest(s)
         if mf2 is None:
-            mf2 = self._manifestmatches(match, s)
+            mf2 = self._buildstatusmanifest(s)
 
         modified, added = [], []
         removed = []
         clean = []
         deleted, unknown, ignored = s.deleted, s.unknown, s.ignored
         deletedset = set(deleted)
-        d = mf1.diff(mf2, clean=listclean)
+        d = mf1.diff(mf2, match=match, clean=listclean)
         for fn, value in d.iteritems():
             if fn in deletedset:
                 continue
@@ -156,8 +152,10 @@
 
         if removed:
             # need to filter files if they are already reported as removed
-            unknown = [fn for fn in unknown if fn not in mf1]
-            ignored = [fn for fn in ignored if fn not in mf1]
+            unknown = [fn for fn in unknown if fn not in mf1 and
+                                               (not match or match(fn))]
+            ignored = [fn for fn in ignored if fn not in mf1 and
+                                               (not match or match(fn))]
             # if they're deleted, don't report them as removed
             removed = [fn for fn in removed if fn not in deletedset]
 
@@ -1581,22 +1579,6 @@
                 pass
         return modified, fixup
 
-    def _manifestmatches(self, match, s):
-        """Slow path for workingctx
-
-        The fast path is when we compare the working directory to its parent
-        which means this function is comparing with a non-parent; therefore we
-        need to build a manifest and return what matches.
-        """
-        mf = self._repo['.']._manifestmatches(match, s)
-        for f in s.modified + s.added:
-            mf[f] = newnodeid
-            mf.setflag(f, self.flags(f))
-        for f in s.removed:
-            if f in mf:
-                del mf[f]
-        return mf
-
     def _dirstatestatus(self, match=None, ignored=False, clean=False,
                         unknown=False):
         '''Gets the status from the dirstate -- internal use only.'''