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-rw-r--r--pkgs/simple/cabal-read.nix39
1 files changed, 39 insertions, 0 deletions
diff --git a/pkgs/simple/cabal-read.nix b/pkgs/simple/cabal-read.nix
new file mode 100644
index 0000000..03b42ef
--- /dev/null
+++ b/pkgs/simple/cabal-read.nix
@@ -0,0 +1,39 @@
+{ writeHaskellPackage }:
+
+# Because `sed -n 's/.*\<ghc-options:\s\+\(.*\)/\1/p'` is too simple.
+writeHaskellPackage "cabal-read" {
+ executables.ghc-options = {
+ extra-depends = ["Cabal"];
+ text = /* haskell */ ''
+ {-# LANGUAGE CPP #-}
+ module Main (main) where
+ import Data.List
+ import Data.Maybe
+ import Distribution.Compiler
+ import Distribution.PackageDescription.Parsec
+ import Distribution.Types.BuildInfo
+ import Distribution.Types.CondTree
+ import Distribution.Types.Executable
+ import Distribution.Types.GenericPackageDescription
+ import Distribution.Types.UnqualComponentName
+ import Distribution.Verbosity
+ import System.Environment
+ main :: IO ()
+ main = do
+ [path, name] <- getArgs
+
+ desc <- readGenericPackageDescription normal path
+
+ case lookup (mkUnqualComponentName name) (condExecutables desc) of
+ Just exe ->
+ putStrLn . intercalate " " . fromMaybe [] . lookup GHC
+ #if MIN_VERSION_Cabal(3,0,0)
+ . perCompilerFlavorToList
+ #endif
+ . options . buildInfo . condTreeData $ exe
+
+ Nothing ->
+ error ("executable " <> name <> " not found in " <> path)
+ '';
+ };
+}