summaryrefslogtreecommitdiffhomepage
path: root/src/Xmobar/Runnable.hs
diff options
context:
space:
mode:
authorjao <jao@gnu.org>2018-11-21 23:51:41 +0000
committerjao <jao@gnu.org>2018-11-21 23:51:41 +0000
commit50134d5b5c4baabdfb35c0aeb8bf53d29f009c4d (patch)
treea710ee9a8e9ea9e46951d371af29081e1c72f502 /src/Xmobar/Runnable.hs
parent7674145b878fd315999558075edcfc5e09bdd91c (diff)
downloadxmobar-50134d5b5c4baabdfb35c0aeb8bf53d29f009c4d.tar.gz
xmobar-50134d5b5c4baabdfb35c0aeb8bf53d29f009c4d.tar.bz2
All sources moved inside src
Diffstat (limited to 'src/Xmobar/Runnable.hs')
-rw-r--r--src/Xmobar/Runnable.hs60
1 files changed, 0 insertions, 60 deletions
diff --git a/src/Xmobar/Runnable.hs b/src/Xmobar/Runnable.hs
deleted file mode 100644
index 164f661..0000000
--- a/src/Xmobar/Runnable.hs
+++ /dev/null
@@ -1,60 +0,0 @@
-{-# LANGUAGE ExistentialQuantification, MultiParamTypeClasses, FlexibleContexts, FlexibleInstances #-}
------------------------------------------------------------------------------
--- |
--- Module : Xmobar.Runnable
--- Copyright : (c) Andrea Rossato
--- License : BSD-style (see LICENSE)
---
--- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org>
--- Stability : unstable
--- Portability : unportable
---
--- The existential type to store the list of commands to be executed.
--- I must thank Claus Reinke for the help in understanding the mysteries of
--- reading existential types. The Read instance of Runnable must be credited to
--- him.
---
--- See here:
--- http:\/\/www.haskell.org\/pipermail\/haskell-cafe\/2007-July\/028227.html
---
------------------------------------------------------------------------------
-
-module Xmobar.Runnable where
-
-import Control.Monad
-import Text.Read
-import Xmobar.Config (runnableTypes)
-import Xmobar.Commands
-
-data Runnable = forall r . (Exec r, Read r, Show r) => Run r
-
-instance Exec Runnable where
- start (Run a) = start a
- alias (Run a) = alias a
- trigger (Run a) = trigger a
-
-instance Show Runnable where
- show (Run x) = show x
-
-instance Read Runnable where
- readPrec = readRunnable
-
-class ReadAsAnyOf ts ex where
- -- | Reads an existential type as any of hidden types ts
- readAsAnyOf :: ts -> ReadPrec ex
-
-instance ReadAsAnyOf () ex where
- readAsAnyOf ~() = mzero
-
-instance (Read t, Exec t, ReadAsAnyOf ts Runnable) => ReadAsAnyOf (t,ts) Runnable where
- readAsAnyOf ~(t,ts) = r t `mplus` readAsAnyOf ts
- where r ty = do { m <- readPrec; return (Run (m `asTypeOf` ty)) }
-
--- | The 'Prelude.Read' parser for the 'Runnable' existential type. It
--- needs an 'Prelude.undefined' with a type signature containing the
--- list of all possible types hidden within 'Runnable'. See 'Config.runnableTypes'.
--- Each hidden type must have a 'Prelude.Read' instance.
-readRunnable :: ReadPrec Runnable
-readRunnable = prec 10 $ do
- Ident "Run" <- lexP
- parens $ readAsAnyOf runnableTypes