Move commands.forget over to using new walk code.

With no names, it now recursively forgets everything, as is the default
behaviour of other commands.  And prints the names of all files it
hasn't specifically been told to forget.

doc/hg.1.txt

@@ -161,9 +161,13 b' export [-o filespec] [revision] ...::'
 
     -o, --output <filespec>   print output to file with formatted named
 
-forget [files]::
+forget [options] [files]::
     Undo an 'hg add' scheduled for the next commit.
 
+    options:
+    -I, --include <pat>  include directories matching the given patterns
+    -X, --exclude <pat>  exclude directories matching the given patterns
+
 heads::
     Show all repository head changesets.
     

mercurial/commands.py

@@ -601,9 +601,15 b' def export(ui, repo, *changesets, **opts'
         seqno += 1
         doexport(ui, repo, cset, seqno, total, revwidth, opts)
 
-def forget(ui, repo, file1, *files):
+def forget(ui, repo, *pats, **opts):
     """don't add the specified files on the next commit"""
-    repo.forget(relpath(repo, (file1,) + files))
+    q = dict(zip(pats, pats))
+    forget = []
+    for src, abs, rel in walk(repo, pats, opts):
+        if repo.dirstate.state(abs) == 'a':
+            forget.append(abs)
+            if rel not in q: ui.status('forgetting ', rel, '\n')
+    repo.forget(forget)
 
 def heads(ui, repo):
     """show current repository heads"""
@@ -1153,7 +1159,10 b' table = {'
         (export,
          [('o', 'output', "", 'output to file')],
          "hg export [-o OUTFILE] REV..."),
-    "forget": (forget, [], "hg forget FILE..."),
+    "forget": (forget,
+               [('I', 'include', [], 'include path in search'),
+                ('X', 'exclude', [], 'exclude path from search')],
+               "hg forget FILE..."),
     "heads": (heads, [], 'hg heads'),
     "help": (help_, [], 'hg help [COMMAND]'),
     "identify|id": (identify, [], 'hg identify'),