add help command

Command/Help.hs

@@ -0,0 +1,51 @@
+{- git-annex command
+ -
+ - Copyright 2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Command.Help where
+
+import Common.Annex
+import Command
+import qualified Command.Init
+import qualified Command.Add
+import qualified Command.Drop
+import qualified Command.Get
+import qualified Command.Move
+import qualified Command.Copy
+import qualified Command.Sync
+import qualified Command.Whereis
+import qualified Command.Fsck
+
+def :: [Command]
+def = [noCommit $ noRepo showHelp $ dontCheck repoExists $
+	command "help" paramNothing seek "display help"]
+
+seek :: [CommandSeek]
+seek = [withWords start]
+
+start :: [String] -> CommandStart
+start _ = do
+	liftIO showHelp
+	stop
+
+showHelp :: IO ()
+showHelp = liftIO $ putStrLn $ unlines
+	[ "The most commonly used git-annex commands are:"
+	, unlines $ map cmdline $ concat
+		[ Command.Init.def
+		, Command.Add.def
+		, Command.Drop.def
+		, Command.Get.def
+		, Command.Move.def
+		, Command.Copy.def
+		, Command.Sync.def
+		, Command.Whereis.def
+		, Command.Fsck.def
+		]
+	, "Run git-annex without any options for a complete command and option list."
+	]
+	where
+		cmdline c = "\t" ++ cmdname c ++ "\t" ++ cmddesc c

GitAnnex.hs

@@ -71,6 +71,7 @@ import qualified Command.Assistant
 import qualified Command.WebApp
 #endif
 #endif
+import qualified Command.Help
 
 cmds :: [Command]
 cmds = concat
@@ -123,6 +124,7 @@ cmds = concat
 	, Command.WebApp.def
 #endif
 #endif
+	, Command.Help.def
 	]
 
 options :: [Option]

doc/bugs/gix-annex_help_is_homicidal.mdwn

@@ -16,3 +16,8 @@ Something similar to 'git-annex --help', or a pointer to --help.
 > What version of git-annex are you using? On what operating system?
 
 git-annex version 3.20120825 on Arch Linux x86_64, installed from AUR package git-annex and using the [haskell] repository for dependencies.
+
+>> Lol, that's great! Also worth noting that with help.autocorrect=1, it'd
+>> actually run drop. Only with --force can you lose data however.
+>>
+>> I've added a help command. [[done]] --[[Joey]]