From 0798e5f73ce50f342f30be422ac8aba17cdd6528 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Sat, 14 May 2016 18:42:33 +0200
Subject: thinklight

---
 custom/thinklight.nix | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++
 hel.nix               |  3 ++-
 2 files changed, 60 insertions(+), 1 deletion(-)
 create mode 100644 custom/thinklight.nix

diff --git a/custom/thinklight.nix b/custom/thinklight.nix
new file mode 100644
index 00000000..d3d4e7ca
--- /dev/null
+++ b/custom/thinklight.nix
@@ -0,0 +1,58 @@
+{ stdenv, haskellPackages, thinklight ? "thinklight", makeWrapper }:
+
+stdenv.mkDerivation {
+  name = "thinklight-0.1";
+  ghc = haskellPackages.ghcWithPackages (self: [self.strict]);
+  outputs = [ "out" ];
+  builder = builtins.toFile "builder.sh" ''
+    source $stdenv/setup
+    mkdir -p $out/bin
+    $ghc/bin/ghc $src -o $out/bin/thinklight
+    wrapProgram $out/bin/thinklight --set THINKLIGHT ${thinklight}
+  '';
+  src = builtins.toFile "source.hs" ''
+    import Control.Monad (sequence)
+    import System.IO.Error
+    import System.Environment
+    import System.FilePath
+    import Control.Concurrent (threadDelay)
+    import System.IO.Strict (readFile)
+    import Prelude hiding (readFile)
+    import Data.List (intersperse)
+    
+    data Mode = On | Off | Toggle | Blink deriving (Read, Show, Eq)
+    
+    main :: IO ()
+    main = do
+            args <- getArgs
+            let mode = if length args >= 1 then read $ head args else Toggle
+            sequence $ map (\g -> catchIOError g (\e -> if isDoesNotExistError e then return () else ioError e)) [thinklight mode]
+            return ()
+
+    findBase :: IO FilePath
+    findBase = do
+      env <- fromMaybe "thinklight" <$> lookupEnv "THINKLIGHT"
+      return $ "/sys/class/leds/tpacpi::" ++ env
+
+    readMax, readCurrent :: IO String
+    readMax = readFile =<< ((</> "max_brightness") <$> findBase)
+    readCurrent = readFile =<< ((</> "brightness") <$> findBase)
+    writeCurrent :: String -> IO ()
+    writeCurrent str = flip writeFile str =<< ((</> "brightness") <$> findBase)
+
+    thinklight :: Mode -> IO ()
+    thinklight On = readMax >>= writeCurrent . show
+    thinklight Off = writeCurrent "0"
+    thinklight Toggle = do
+            c <- readCurrent
+            m <- readMax
+            let m' = read m :: Int
+            let c' = read c :: Int
+            writeCurrent $ show $ if c' /= 0 then 0 else m'
+    thinklight Blink = do
+            args <- getArgs
+            thinklight Toggle
+            sequence $ intersperse (thinklight Toggle) $ map (\i -> threadDelay $ (read i) * 10^3) (tail args)
+            thinklight Toggle
+  '';
+}
diff --git a/hel.nix b/hel.nix
index b46b7525..29ae5ba9 100644
--- a/hel.nix
+++ b/hel.nix
@@ -48,6 +48,7 @@
     git
     slock
     shadow
+    (callPackage ./custom/thinklight.nix { thinklight = "kbd_backlight"; })
   ];
 
   services = {
@@ -141,7 +142,7 @@
       %wheel ALL=(ALL) NOPASSWD: SYSCTRL
     '';
 
-    setuidPrograms = ["slock" "mount" "mount.nfs" "umount" "newgrp"];
+    setuidPrograms = ["slock" "mount" "mount.nfs" "umount" "newgrp" "thinklight"];
   };
 
   time.timeZone = "Europe/Berlin";
-- 
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