diff options
Diffstat (limited to 'tv/5pkgs/haskell/th-env/src/THEnv.hs')
-rw-r--r-- | tv/5pkgs/haskell/th-env/src/THEnv.hs | 49 |
1 files changed, 0 insertions, 49 deletions
diff --git a/tv/5pkgs/haskell/th-env/src/THEnv.hs b/tv/5pkgs/haskell/th-env/src/THEnv.hs deleted file mode 100644 index b04f2ce..0000000 --- a/tv/5pkgs/haskell/th-env/src/THEnv.hs +++ /dev/null @@ -1,49 +0,0 @@ -{-# LANGUAGE TemplateHaskell #-} -module THEnv - ( - -- * Compile-time configuration - lookupCompileEnv - , lookupCompileEnvExp - , getCompileEnv - , getCompileEnvExp - , fileAsString - ) where - -import Control.Monad -import qualified Data.Text as T -import qualified Data.Text.IO as T -import Language.Haskell.TH -import Language.Haskell.TH.Syntax (Lift(..)) -import System.Environment (getEnvironment) - --- Functions that work with compile-time configuration - --- | Looks up a compile-time environment variable. -lookupCompileEnv :: String -> Q (Maybe String) -lookupCompileEnv key = lookup key `liftM` runIO getEnvironment - --- | Looks up a compile-time environment variable. The result is a TH --- expression of type @Maybe String@. -lookupCompileEnvExp :: String -> Q Exp -lookupCompileEnvExp = (`sigE` [t| Maybe String |]) . lift <=< lookupCompileEnv - -- We need to explicly type the result so that things like `print Nothing` - -- work. - --- | Looks up an compile-time environment variable and fail, if it's not --- present. -getCompileEnv :: String -> Q String -getCompileEnv key = - lookupCompileEnv key >>= - maybe (fail $ "Environment variable " ++ key ++ " not defined") return - --- | Looks up an compile-time environment variable and fail, if it's not --- present. The result is a TH expression of type @String@. -getCompileEnvExp :: String -> Q Exp -getCompileEnvExp = lift <=< getCompileEnv - --- | Loads the content of a file as a string constant expression. --- The given path is relative to the source directory. -fileAsString :: FilePath -> Q Exp -fileAsString = do - -- addDependentFile path -- works only with template-haskell >= 2.7 - stringE . T.unpack . T.strip <=< runIO . T.readFile |