wip

1 files changed, 12 insertions, 0 deletions

diff --git a/Command.hs b/Command.hs
index e3508d68c..df72ad2a7 100644
--- a/Command.hs
+++ b/Command.hs
@@ -8,6 +8,7 @@
 module Command (
 	command,
 	withParams,
+	(<--<),
 	noRepo,
 	noCommit,
 	noMessages,
@@ -46,6 +47,17 @@ command name section desc paramdesc mkparser =
 withParams :: (CmdParams -> v) -> CmdParamsDesc -> O.Parser v
 withParams mkseek paramdesc = mkseek <$> cmdParams paramdesc
 
+{- Uses the supplied option parser, which yields a deferred parse,
+ - and calls finishParse on the result before passing it to the
+ - CommandSeek constructor. -}
+(<--<) :: DeferredParseClass a
+	=> (a -> CommandSeek) 
+	-> (CmdParamsDesc -> Parser a)
+	-> CmdParamsDesc
+	-> Parser CommandSeek
+(<--<) mkseek optparser paramsdesc = 
+	(mkseek <=< finishParse) <$> optparser paramsdesc
+
 {- Indicates that a command doesn't need to commit any changes to
  - the git-annex branch. -}
 noCommit :: Command -> Command