Updater (empty) → 0.1

raw patch · 4 files changed

+294/−0 lines, 4 filesdep +basedep +stmsetup-changed

Dependencies added: base, stm

Files

• LICENSE +201/−0
• Setup.hs +2/−0
• Updater.cabal +22/−0
• Updater.hs +69/−0

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@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,22 @@+Name:	Updater+Version:	0.1+Cabal-Version:	>= 1.6+License:	Apache-2.0+License-File:	LICENSE+Author:		Silvio Frischknecht+Homepage:	https://github.com/yokto/Updater+Category:	FRP+Maintainer: silvio.frischi@gmail.com+Synopsis:	Monadic FRP library based on stm+Description:	Read the homepage for more information.+Build-Type:	Simple++Library+  Build-Depends:	base >= 3 && < 5, stm+  Exposed-Modules:+    Updater++source-repository this+  type:        git+  location:    https://github.com/yokto/Updater.git+  tag: 0.1

@@ -0,0 +1,69 @@+{-# LANGUAGE GeneralizedNewtypeDeriving #-}+module Updater (+	-- * Signals+ 	Signal(),+ 	newSignal,+ 	getValue,+-- 	addListener,+	-- * Updater Monad+	Updater(),+	runUpdater,+	getEvent,+	onCommit,+	onCleanup,+	-- * Helpers+	stop,+	getBehavior,+	local,+	liftSTM,+	putLine+	) where++import Control.Concurrent.STM+import Control.Applicative+import Updater.Internal hiding (getValue, newSignal)+import qualified Updater.Internal as Internal++import Control.Concurrent+++-- |+-- Just a synonym for `empty` from `Alternative`.+-- It basically prevents signals from ever progressing beyond this point.+-- You can use this to make a filter for instance+--+-- >when (condition) stop+stop :: Updater a+stop = empty++-- |+-- Just for some quick debugging+--+-- >putLine = onCommit . putStrLn+putLine :: String -> Updater ()+putLine = onCommit . putStrLn++-- |+-- Returns immediately after registering the given computation.+-- However, events from inside will not spread outside, except for+-- the initial one.+--+-- It is implemented like this+--+-- >local computation = return () <|> (computation >> stop)+local :: Updater a -> Updater ()+local computation = return () <|> (computation >> stop)++-- |+-- Gets the current value.+-- Return Nothing if the signal is uninitialized.+getValue :: Signal a -> Updater (Maybe a)+getValue = liftSTM . Internal.getValue++-- |+-- Creates a new signal and gives you a way to update it.+-- It is important to note that because the signal and the+-- update function are separate, you can easily have readonly,+-- writeonly permissions.+newSignal :: Updater (a -> Updater (), Signal a)+newSignal = liftSTM Internal.newSignal