doc, examples

1 files changed, 41 insertions, 0 deletions

diff --git a/examples/xmonadpropwrite.hs b/examples/xmonadpropwrite.hs
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+-- Copyright Spencer Janssen <spencerjanssen@gmail.com>
+--           Tomas Janousek <tomi@nomi.cz>
+-- BSD3 (see LICENSE)
+--
+-- Reads from standard input and writes to an X propery on root window.
+-- To be used with XPropertyLog:
+--  Add it to commands:
+--      Run XPropertyLog "_XMONAD_LOG_CUSTOM"
+--  Add it to the template:
+--      template = "... %_XMONAD_LOG_CUSTOM% ..."
+--  Run:
+--      $ blah blah | xmonadpropwrite _XMONAD_LOG_CUSTOM
+
+import Control.Monad
+import Graphics.X11
+import Graphics.X11.Xlib.Extras
+import qualified Data.ByteString as B
+import Foreign.C (CChar)
+import System.IO
+import System.Environment
+
+main = do
+    atom <- flip fmap getArgs $ \args -> case args of
+        [a] -> a
+        _   -> "_XMONAD_LOG"
+
+    d <- openDisplay ""
+    xlog <- internAtom d atom False
+    ustring <- internAtom d "UTF8_STRING" False
+
+    root  <- rootWindow d (defaultScreen d)
+
+    forever $ do
+        msg <- B.getLine
+        changeProperty8 d root xlog ustring propModeReplace (encodeCChar msg)
+        sync d True
+
+    return ()
+
+encodeCChar :: B.ByteString -> [CChar]
+encodeCChar = map fromIntegral . B.unpack