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|
{-# OPTIONS -fglasgow-exts #-}
-----------------------------------------------------------------------------
-- |
-- Module : xmonad-status.hs
-- Copyright : (c) Don Stewart 2007
-- License : BSD3-style
-- Maintainer : dons@cse.unsw.edu.au
--
-- An external statusbar-client for xmonad.
--
-- Prints the workspaces in a simple form, read from the logging output
-- of xmonad.
--
-- An example use:
--
-- xmonad | xmonad-status | dzen2 -ta l -fg '#a8a3f7' -bg '#3f3c6d'
--
-- Creates a workspace table on the left side of the screen.
--
-- A version that perfectly emulates wmii or dwm could be distributed.
--
-----------------------------------------------------------------------------
import Data.List
import StackSet
import XMonad
import System.IO
import Text.PrettyPrint
import Graphics.X11.Types (Window)
--
-- parse the StackSet output, and print it in the form:
--
-- *[1] 2 *3 *4 5 6 7 8
--
-- It's an example of how to write a Haskell script to hack
-- the structure defined in StackSet.hs
--
main = forever $ getLine >>= readIO >>= draw
where
forever a = a >> forever a
--
-- All the magic is in the 'ppr' instances, below.
--
draw :: WindowSet -> IO ()
draw s = do putStrLn . render . ppr $ s
hFlush stdout
-- ---------------------------------------------------------------------
--
-- A simple recursive descent pretty printer for the StackSet type.
--
class Pretty a where
ppr :: a -> Doc
--
-- And instances for the StackSet layers
--
instance Pretty WindowSet where
ppr (StackSet { current = cws -- the different workspaces
, visible = vws
, hidden = hws }) = ppr (sortBy tags workspaces)
where
-- tag each workspace with its flavour
workspaces = C (workspace cws) : map (V . workspace) vws ++ map H hws
-- sort them by their tags
tags a b = (tag.unWrap) a `compare` (tag.unWrap) b
--
-- How to print each workspace kind
--
instance Pretty TaggedW where
ppr (C w) = brackets (ppr w) -- [1]
ppr (V w) = parens (ppr w) -- <2>
ppr (H w) = char ' ' <> ppr w <> char ' ' -- 3
-- tags are printed as integers (or map them to strings)
instance Pretty W where
-- Just print int tags:
ppr (Workspace i s) = int (1 + fromIntegral i) <> ppr s
{-
ppr (Workspace i s) =
hcat [ppr s
,int (1 + fromIntegral i)
,char ':'
,text tag]
where
tag | Just t <- lookup i tags = t
| otherwise = "dev"
tags = zip [0..8] ["irc","web","ghc"]
-}
-- non-empty stacks get a '*'
instance Pretty (Stack Window) where
ppr Empty = empty
ppr _ = char '*'
-- lists are printed with whitespace
instance Pretty a => Pretty [a] where
ppr [] = empty
ppr (x:xs) = ppr x <> ppr xs
-- ---------------------------------------------------------------------
-- Some type information for the pretty printer
-- We have a fixed workspace type
type W = Workspace WorkspaceId Window
-- Introduce a newtype to distinguish different workspace flavours
data TaggedW = C W -- current
| V W -- visible
| H W -- hidden
-- And the ability to unwrap tagged workspaces
unWrap :: TaggedW -> W
unWrap (C w) = w
unWrap (V w) = w
unWrap (H w) = w
|
