revert added and removed files to their normal state before reverting

add a test for revert

tests/test-revert

@@ -0,0 +1,24 b''
+#!/bin/sh
+
+hg init
+echo 123 > a
+echo 123 > c
+hg add a c
+hg commit -m "first" -d "0 0" a c
+echo 123 > b
+hg status
+echo 12 > c
+hg status
+hg add b
+hg status
+hg rm a
+hg status
+hg revert a
+hg status
+hg revert b
+hg status
+hg revert c
+hg status
+ls
+
+true

tests/test-revert.out

@@ -0,0 +1,16 b''
+? b
+M c
+? b
+M c
+A b
+M c
+A b
+R a
+M c
+A b
+M c
+? b
+? b
+a
+b
+c

mercurial/commands.py

@@ -1824,6 +1824,10 b' def revert(ui, repo, *names, **opts):'
             chosen[relname] = 1
         return ret
 
+    (c, a, d, u) = repo.changes()
+    repo.forget(filter(choose, a))
+    repo.undelete(filter(choose, d))
+
     r = repo.update(node, False, True, choose, False)
     for n in relnames:
         if n not in chosen:

mercurial/localrepo.py

@@ -555,6 +555,30 b' class localrepository:'
             else:
                 self.dirstate.update([f], "r")
 
+    def undelete(self, list):
+        pl = self.dirstate.parents()
+        if pl[1] != nullid:
+            self.ui.warn("aborting: outstanding uncommitted merges\n")
+            return 1
+        p = pl[0]
+        mn = self.changelog.read(p)[0]
+        mf = self.manifest.readflags(mn)
+        m = self.manifest.read(mn)
+        for f in list:
+            if self.dirstate.state(f) not in  "r":
+                self.ui.warn("%s not removed!\n" % f)
+            else:
+                t = self.file(f).read(m[f])
+                try:
+                    self.wwrite(f, t)
+                except IOError, e:
+                    if e.errno != errno.ENOENT:
+                        raise
+                    os.makedirs(os.path.dirname(self.wjoin(f)))
+                    self.wwrite(f, t)
+                util.set_exec(self.wjoin(f), mf[f])
+                self.dirstate.update([f], "n")
+
     def copy(self, source, dest):
         p = self.wjoin(dest)
         if not os.path.exists(p):