1 files changed, 67 insertions, 0 deletions

diff --git a/src/PursLoader/FS.purs b/src/PursLoader/FS.purs
new file mode 100644
index 0000000..6955a63
--- /dev/null
+++ b/src/PursLoader/FS.purs
@@ -0,0 +1,67 @@
+module PursLoader.FS
+  ( FS()
+  , writeFileUtf8
+  , findFileUtf8
+  ) where
+
+import Control.Monad.Aff (Aff(), makeAff)
+import Control.Monad.Eff (Eff())
+import Control.Monad.Eff.Exception (Error())
+
+import Data.Maybe (Maybe(..))
+import Data.String.Regex (Regex())
+
+import Data.Function
+
+foreign import data FS :: !
+
+writeFileUtf8 :: forall eff. String -> String -> Aff (fs :: FS | eff) Unit
+writeFileUtf8 filepath contents = makeAff $ runFn4 writeFileUtf8Fn filepath contents
+
+foreign import writeFileUtf8Fn """
+function writeFileUtf8Fn(filepath, contents, errback, callback) {
+  return function(){
+    var fs = require('fs');
+
+    fs.writeFile(filepath, contents, function(error){
+      if (error) errback(error)();
+      else callback()();
+    });
+  };
+}
+""" :: forall eff. Fn4 String
+                       String
+                       (Error -> Eff (fs :: FS | eff) Unit)
+                       (Unit -> Eff (fs :: FS | eff) Unit)
+                       (Eff (fs :: FS | eff) Unit)
+
+findFileUtf8 :: forall eff. Regex -> [String] -> Aff (fs :: FS | eff) (Maybe String)
+findFileUtf8 regexp filepaths = makeAff $ runFn6 findFileUtf8Fn Nothing Just regexp filepaths
+
+foreign import findFileUtf8Fn """
+function findFileUtf8Fn(nothing, just, regex, filepaths, errback, callback) {
+  return function(){
+    var fs = require('fs');
+
+    var async = require('async');
+
+    function findFile(filepath, callback) {
+      fs.readFile(filepath, {encoding: 'utf-8'}, function(error, result){
+        if (error) callback(false);
+        else callback(regex.test(result));
+      });
+    }
+
+    async.detect(filepaths, findFile, function(result){
+      if (!result) callback(nothing)();
+      else callback(just(result))();
+    });
+  };
+}
+""" :: forall eff. Fn6 (Maybe String)
+                       (String -> Maybe String)
+                       Regex
+                       [String]
+                       (Error -> Eff (fs :: FS | eff) Unit)
+                       (Maybe String -> Eff (fs :: FS | eff) Unit)
+                       (Eff (fs :: FS | eff) Unit)