1 files changed, 107 insertions, 0 deletions

diff --git a/src/PursLoader/Options.purs b/src/PursLoader/Options.purs
new file mode 100644
index 0000000..51e9be5
--- /dev/null
+++ b/src/PursLoader/Options.purs
@@ -0,0 +1,107 @@
+module PursLoader.Options
+  ( pscOptions
+  , loaderSrcOption
+  , loaderFFIOption
+  ) where
+
+import Data.Array (concat)
+import Data.Either (either)
+
+import Data.Foreign (Foreign(), F())
+import Data.Foreign.Class (IsForeign, read, readProp)
+import Data.Foreign.NullOrUndefined (NullOrUndefined(..), runNullOrUndefined)
+
+import Data.Maybe (Maybe(..), maybe, fromMaybe)
+
+noPreludeOpt = "no-prelude"
+
+noOptsOpt = "no-opts"
+
+noMagicDoOpt = "no-magic-do"
+
+noTcoOpt = "no-tco"
+
+verboseErrorsOpt = "verbose-errors"
+
+outputOpt = "output"
+
+commentsOpt = "comments"
+
+noPrefixOpt = "no-prefix"
+
+requirePathOpt = "require-path"
+
+srcOpt = "src"
+
+ffiOpt = "ffi"
+
+newtype Options
+  = Options { noPrelude :: NullOrUndefined Boolean
+            , noOpts :: NullOrUndefined Boolean
+            , noMagicDo :: NullOrUndefined Boolean
+            , noTco :: NullOrUndefined Boolean
+            , verboseErrors :: NullOrUndefined Boolean
+            , comments :: NullOrUndefined Boolean
+            , output :: NullOrUndefined String
+            , noPrefix :: NullOrUndefined Boolean
+            , requirePath :: NullOrUndefined String
+            , src :: NullOrUndefined [String]
+            , ffi :: NullOrUndefined [String]
+            }
+
+instance isForeignOptions :: IsForeign Options where
+  read obj = Options <$> ({ noPrelude: _
+                          , noOpts: _
+                          , noMagicDo: _
+                          , noTco: _
+                          , verboseErrors: _
+                          , comments: _
+                          , output: _
+                          , noPrefix: _
+                          , requirePath: _
+                          , src: _
+                          , ffi: _
+                          } <$> readProp noPreludeOpt obj
+                            <*> readProp noOptsOpt obj
+                            <*> readProp noMagicDoOpt obj
+                            <*> readProp noTcoOpt obj
+                            <*> readProp verboseErrorsOpt obj
+                            <*> readProp commentsOpt obj
+                            <*> readProp outputOpt obj
+                            <*> readProp noPrefixOpt obj
+                            <*> readProp requirePathOpt obj
+                            <*> readProp srcOpt obj
+                            <*> readProp ffiOpt obj)
+
+class LoaderOption a where
+  opt :: String -> NullOrUndefined a -> [String]
+
+instance booleanLoaderOption :: LoaderOption Boolean where
+  opt key val = maybe [] (\a -> if a then ["--" ++ key] else []) (runNullOrUndefined val)
+
+instance stringLoaderOption :: LoaderOption String where
+  opt key val = maybe [] (\a -> ["--" ++ key ++ "=" ++ a]) (runNullOrUndefined val)
+
+instance arrayLoaderOption :: (LoaderOption a) => LoaderOption [a] where
+  opt key val = concat (opt key <$> (NullOrUndefined <<< Just)
+                                <$> (fromMaybe [] (runNullOrUndefined val)))
+
+pscOptions :: Foreign -> [String]
+pscOptions query = either (const []) fold parsed
+  where parsed = read query :: F Options
+        fold (Options a) = opt noPreludeOpt a.noPrelude <>
+                           opt noOptsOpt a.noOpts <>
+                           opt noMagicDoOpt a.noMagicDo <>
+                           opt noTcoOpt a.noTco <>
+                           opt verboseErrorsOpt a.verboseErrors <>
+                           opt commentsOpt a.comments <>
+                           opt outputOpt a.output <>
+                           opt noPrefixOpt a.noPrefix <>
+                           opt requirePathOpt a.requirePath <>
+                           opt ffiOpt a.ffi
+
+loaderSrcOption :: Foreign -> Maybe [String]
+loaderSrcOption query = either (const Nothing) (\(Options a) -> runNullOrUndefined a.src) (read query)
+
+loaderFFIOption :: Foreign -> Maybe [String]
+loaderFFIOption query = either (const Nothing) (\(Options a) -> runNullOrUndefined a.ffi) (read query)