revert: move manifest membership condition outside of the loop

Currently, revset is using information from dirstate status and alter its
behavior whenever the file exist in the target manifest or not. This tests are
done a big for loop. We move this member ship testing outside of the loop and
simplifies associates data structure.

This is a step toward a cleaner implementation of revert based on status.

mercurial/cmdutil.py

@@ -2386,6 +2386,18 b' def revert(ui, repo, ctx, parents, *pats'
                 return _('forgetting %s\n')
             return _('removing %s\n')
 
+        # split between files known in target manifest and the others
+        smf = set(mf)
+
+        missingmodified = modified - smf
+        modified -= missingmodified
+        missingadded = added - smf
+        added -= missingadded
+        missingremoved = removed - smf
+        removed -= missingremoved
+        missingdeleted = deleted - smf
+        deleted -= missingdeleted
+
         # action to be actually performed by revert
         # (<list of file>, message>) tuple
         actions = {'revert': ([], _('reverting %s\n')),
@@ -2396,18 +2408,16 b' def revert(ui, repo, ctx, parents, *pats'
         disptable = (
             # dispatch table:
             #   file state
-            #   action if in target manifest
-            #   action if not in target manifest
-            #   make backup if in target manifest
-            #   make backup if not in target manifest
-            (modified, (actions['revert'],   True),
-                       (actions['remove'],   True)),
-            (added,    (actions['revert'],   True),
-                       (actions['remove'],   False)),
-            (removed,  (actions['undelete'], True),
-                       (None,                False)),
-            (deleted,  (actions['revert'], False),
-                       (actions['remove'], False)),
+            #   action
+            #   make backup
+            (modified,         (actions['revert'],   True)),
+            (missingmodified,  (actions['remove'],   True)),
+            (added,            (actions['revert'],   True)),
+            (missingadded,     (actions['remove'],   False)),
+            (removed,          (actions['undelete'], True)),
+            (missingremoved,   (None,                False)),
+            (deleted,          (actions['revert'],   False)),
+            (missingdeleted,   (actions['remove'],   False)),
             )
 
         for abs, (rel, exact) in sorted(names.items()):
@@ -2433,14 +2443,11 b' def revert(ui, repo, ctx, parents, *pats'
             # search the entry in the dispatch table.
             # if the file is in any of this sets, it was touched in the working
             # directory parent and we are sure it needs to be reverted.
-            for table, hit, miss in disptable:
+            for table, (action, backup) in disptable:
                 if abs not in table:
                     continue
-                # file has changed in dirstate
-                if mfentry:
-                    handle(*hit)
-                elif miss[0] is not None:
-                    handle(*miss)
+                if action is not None:
+                    handle(action, backup)
                 break
             else:
                 # Not touched in current dirstate.