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| -rw-r--r-- | scripts/xmonad-status.hs | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/scripts/xmonad-status.hs b/scripts/xmonad-status.hs new file mode 100644 index 0000000..ef41313 --- /dev/null +++ b/scripts/xmonad-status.hs @@ -0,0 +1,125 @@ +{-# 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 | mux | 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 |