context: add private _dirstatestatus method

context: add private _dirstatestatus method

This patch is a step forward in getting rid of needing to check 'parentworking'
throughout the status method. Eventually, we will use the power of inheritance
to do the correct thing when comparing the working directory with its parent.

This method is mostly a copy from localrepo.status. The custom status method of
workingctx will eventually be absorbed by the refactoring of localrepo.status
to context.status but unfortunately we can't do it in one step.

--- a/mercurial/context.py	Tue Mar 11 18:28:09 2014 -0500
+++ b/mercurial/context.py	Tue Apr 22 13:14:51 2014 -0500
@@ -1213,6 +1213,29 @@
                 pass
         return modified, fixup
 
+    def _dirstatestatus(self, match=None, ignored=False, clean=False,
+                        unknown=False):
+        '''Gets the status from the dirstate -- internal use only.'''
+        listignored, listclean, listunknown = ignored, clean, unknown
+        match = match or matchmod.always(self._repo.root, self._repo.getcwd())
+        subrepos = []
+        if '.hgsub' in self:
+            subrepos = sorted(self.substate)
+        s = self._repo.dirstate.status(match, subrepos, listignored,
+                                       listclean, listunknown)
+        cmp, modified, added, removed, deleted, unknown, ignored, clean = s
+
+        # check for any possibly clean files
+        if cmp:
+            modified2, fixup = self._checklookup(cmp)
+            modified += modified2
+
+            # update dirstate for files that are actually clean
+            if fixup and listclean:
+                clean += fixup
+
+        return [modified, added, removed, deleted, unknown, ignored, clean]
+
     def status(self, ignored=False, clean=False, unknown=False):
         """Explicit status query
         Unless this method is used to query the working copy status, the