assistant: When autostarted, wait 5 seconds before running the startup scan, to avoid contending with the user's desktop login process.

Command/Assistant.hs

@@ -14,43 +14,55 @@ import qualified Command.Watch
 import Init
 import Config.Files
 import qualified Build.SysConfig
+import Utility.HumanTime
 
 import System.Environment
 
 def :: [Command]
-def = [noRepo checkAutoStart $ dontCheck repoExists $
-	withOptions [Command.Watch.foregroundOption, Command.Watch.stopOption, autoStartOption] $ 
+def = [noRepo checkAutoStart $ dontCheck repoExists $ withOptions options $
 	command "assistant" paramNothing seek SectionCommon
 		"automatically handle changes"]
 
+options :: [Option]
+options =
+	[ Command.Watch.foregroundOption
+	, Command.Watch.stopOption
+	, autoStartOption
+	, startDelayOption
+	]
+
 autoStartOption :: Option
 autoStartOption = Option.flag [] "autostart" "start in known repositories"
 
+startDelayOption :: Option
+startDelayOption = Option.field [] "startdelay" paramNumber "delay before running startup scan"
+
 seek :: [CommandSeek]
 seek = [withFlag Command.Watch.stopOption $ \stopdaemon ->
 	withFlag Command.Watch.foregroundOption $ \foreground ->
 	withFlag autoStartOption $ \autostart ->
-	withNothing $ start foreground stopdaemon autostart]
+	withField startDelayOption (pure . maybe Nothing parseDuration) $ \startdelay -> 
+	withNothing $ start foreground stopdaemon autostart startdelay]
 
-start :: Bool -> Bool -> Bool -> CommandStart
-start foreground stopdaemon autostart
+start :: Bool -> Bool -> Bool -> Maybe Duration -> CommandStart
+start foreground stopdaemon autostart startdelay
 	| autostart = do
-		liftIO autoStart
+		liftIO $ autoStart startdelay
 		stop
 	| otherwise = do
 		ensureInitialized
-		Command.Watch.start True foreground stopdaemon
+		Command.Watch.start True foreground stopdaemon startdelay
 
 {- Run outside a git repository. Check to see if any parameter is
  - --autostart and enter autostart mode. -}
 checkAutoStart :: IO ()
 checkAutoStart = ifM (elem "--autostart" <$> getArgs)
-	( autoStart
+	( autoStart Nothing
 	, error "Not in a git repository."
 	) 
 
-autoStart :: IO ()
-autoStart = do
+autoStart :: Maybe Duration -> IO ()
+autoStart startdelay = do
 	dirs <- liftIO readAutoStartFile
 	when (null dirs) $ do
 		f <- autoStartFile
@@ -67,5 +79,10 @@ autoStart = do
 	go haveionice program dir = do
 		setCurrentDirectory dir
 		if haveionice
-			then boolSystem "ionice" [Param "-c3", Param program, Param "assistant"]
-			else boolSystem program [Param "assistant"]
+			then boolSystem "ionice" (Param "-c3" : Param program : baseparams)
+			else boolSystem program baseparams
+	  where
+		baseparams =
+			[ Param "assistant"
+			, Param $ "--startdelay=" ++ fromDuration (fromMaybe (Duration 5) startdelay)
+			]