tv xmonad: read screen/font width from build env

1 files changed, 18 insertions, 0 deletions

diff --git a/tv/5pkgs/haskell/xmonad-tv/src/THEnv/JSON.hs b/tv/5pkgs/haskell/xmonad-tv/src/THEnv/JSON.hs
new file mode 100644
index 00000000..2a3a0e52
--- /dev/null
+++ b/tv/5pkgs/haskell/xmonad-tv/src/THEnv/JSON.hs
@@ -0,0 +1,18 @@
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module THEnv.JSON where
+
+import Data.Aeson (eitherDecode,FromJSON)
+import Data.ByteString.Lazy.Char8 (pack)
+import Language.Haskell.TH.Syntax (Exp,Lift(lift),Q)
+import THEnv (getCompileEnv)
+import Control.Monad
+
+getCompileEnvJSON :: (FromJSON a) => String -> Q a
+getCompileEnvJSON name =
+    either error (id :: a -> a) . eitherDecode . pack <$>  getCompileEnv name
+
+getCompileEnvJSONExp ::
+  forall proxy a. (FromJSON a, Lift a) => proxy a -> String -> Q Exp
+getCompileEnvJSONExp _ =
+    (lift :: a -> Q Exp) <=< getCompileEnvJSON