-- | Lookup a value in a text file, tracking the result. Each line of the file
-- is expected to have @key = value@ format.
lookupValue :: FilePath -> String -> Action (Maybe String)
lookupValue file key = askOracle $ KeyValue (file, key)
lookupValue :: FilePath -> String -> Action (Maybe String)
lookupValue file key = askOracle $ KeyValue (file, key)
lookupValue file key = askOracle $ KeyValue (file, key)