ADD xmobar indicator for keyboad backlight (kinda)

bin/xmobar.hs

@@ -24,6 +24,7 @@ import           System.IO.Error
 import           System.Process                      (readProcessWithExitCode)
 
 import           Xmobar.Plugins.Bluetooth
+import           Xmobar.Plugins.ClevoKeyboard
 import           Xmobar.Plugins.Device
 import           Xmobar.Plugins.IntelBacklight
 import           Xmobar.Plugins.Screensaver
@@ -171,6 +172,12 @@ blCmd = CmdSpec
   , csRunnable = Run $ IntelBacklight "<fn=1>\xf185</fn>"
   }
 
+ckCmd :: CmdSpec
+ckCmd = CmdSpec
+  { csAlias = ckAlias
+  , csRunnable = Run $ ClevoKeyboard ("<fn=1>\xf40b</fn>", T.fgColor, T.backdropFgColor)  5
+  }
+
 ssCmd :: CmdSpec
 ssCmd = CmdSpec
   { csAlias = ssAlias
@@ -291,6 +298,7 @@ getAllCommands = do
     , getAlsa
     , getBattery
     , getBl
+    , noSetup ckCmd
     , getSs
     , noSetup lockCmd
     , noSetup dateCmd
@@ -334,23 +342,18 @@ barFont = T.fmtFontXFT T.font
   , T.weight = Just T.Bold
   }
 
-iconFont :: String
+nerdFont :: Int -> String
-iconFont = T.fmtFontXFT T.font
+nerdFont size = T.fmtFontXFT T.font
   { T.family = "Symbols Nerd Font"
   , T.size = Nothing
-  , T.pixelsize = Just 13
+  , T.pixelsize = Just size
   }
 
+iconFont :: String
+iconFont = nerdFont 13
+
 iconFontLarge :: String
-iconFontLarge = T.fmtFontXFT T.font
+iconFontLarge = nerdFont 15
-  { T.family = "Symbols Nerd Font"
-  , T.size = Nothing
-  , T.pixelsize = Just 15
-  }
 
 iconFontXLarge :: String
-iconFontXLarge = T.fmtFontXFT T.font
+iconFontXLarge = nerdFont 20
-  { T.family = "Symbols Nerd Font"
-  , T.size = Nothing
-  , T.pixelsize = Just 20
-  }

lib/Xmobar/Plugins/ClevoKeyboard.hs

@@ -0,0 +1,51 @@
+--------------------------------------------------------------------------------
+-- | Clevo Keyboard plugin
+--
+-- Use the custom DBus interface exported by the XMonad process so I can react
+-- to signals spawned by commands
+
+module Xmobar.Plugins.ClevoKeyboard
+  ( ClevoKeyboard(..)
+  , ckAlias
+  ) where
+
+import           Data.Char
+import           Data.Text               (unpack)
+import           Data.Text.IO            as T (readFile)
+
+import           Xmobar
+
+import           XMonad.Hooks.DynamicLog (xmobarColor)
+
+-- import           XMonad.Internal.DBus.IntelBacklight
+
+data ClevoKeyboard = ClevoKeyboard (String, String, String) Int
+  deriving (Read, Show)
+
+ckAlias :: String
+ckAlias = "clevokeyboard"
+
+brightnessFile :: FilePath
+brightnessFile = "/sys/devices/platform/tuxedo_keyboard/brightness"
+
+stateFile :: FilePath
+stateFile = "/sys/devices/platform/tuxedo_keyboard/state"
+
+readBrightness :: FilePath -> IO Integer
+readBrightness file = read . takeWhile isDigit . unpack <$> T.readFile file
+
+readState :: FilePath -> IO Bool
+readState file = (==1) <$> readBrightness file
+
+instance Exec ClevoKeyboard where
+  alias (ClevoKeyboard _ _) = ckAlias
+  rate (ClevoKeyboard _ r) = r
+  run (ClevoKeyboard (icon, colorOn, colorOff) _) = do
+    b <- readBrightness brightnessFile
+    s <- readState stateFile
+    return $ formatBrightness s (fromIntegral b :: Double)
+    where
+      formatBrightness s b =
+        let iconColor = if s then colorOn else colorOff
+            n = show (round $ b / 255 * 100 :: Integer) ++ "%"
+        in xmobarColor iconColor "" icon ++ n

my-xmonad.cabal

@@ -21,6 +21,7 @@ library
                    , XMonad.Internal.DBus.Screensaver
                    , XMonad.Internal.Process
                    , Xmobar.Plugins.Bluetooth
+                   , Xmobar.Plugins.ClevoKeyboard
                    , Xmobar.Plugins.Device
                    , Xmobar.Plugins.IntelBacklight
                    , Xmobar.Plugins.Screensaver