1 files changed, 25 insertions, 0 deletions
diff --git a/users/Profpatsch/arglib/ArglibNetencode.hs b/users/Profpatsch/arglib/ArglibNetencode.hs
new file mode 100644
index 000000000000..e4609d26abf5
--- /dev/null
+++ b/users/Profpatsch/arglib/ArglibNetencode.hs
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+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes #-}
+
+module ArglibNetencode where
+
+import qualified Data.Attoparsec.ByteString as Atto
+import Data.Maybe (fromMaybe)
+import ExecHelpers
+import MyPrelude
+import Netencode
+import qualified System.Environment as Env
+import qualified System.Posix.Env.ByteString as ByteEnv
+
+arglibNetencode :: CurrentProgramName -> Maybe Text -> IO T
+arglibNetencode progName mEnvvar = do
+  let envvar = mEnvvar & fromMaybe "ARGLIB_NETENCODE" & textToBytesUtf8
+  ByteEnv.getEnv envvar >>= \case
+    Nothing -> dieUserError progName [fmt|could not read args, envvar {envvar} not set|]
+    Just bytes ->
+      case Atto.parseOnly (Netencode.netencodeParser <* Atto.endOfInput) bytes of
+        Left err -> dieEnvironmentProblem progName [fmt|arglib parsing error: {err}|]
+        Right t -> do
+          ByteEnv.unsetEnv envvar
+          pure t