1 files changed, 56 insertions, 0 deletions

diff --git a/src/PursLoader/ChildProcess.purs b/src/PursLoader/ChildProcess.purs
new file mode 100644
index 0000000..34558fa
--- /dev/null
+++ b/src/PursLoader/ChildProcess.purs
@@ -0,0 +1,56 @@
+module PursLoader.ChildProcess
+  ( ChildProcess()
+  , spawn
+  ) where
+
+import Control.Monad.Aff (Aff(), makeAff)
+import Control.Monad.Eff (Eff())
+import Control.Monad.Eff.Exception (Error())
+
+import Data.Function
+
+foreign import data ChildProcess :: !
+
+spawn :: forall eff. String -> [String] -> Aff (cp :: ChildProcess | eff) String
+spawn command args = makeAff $ runFn4 spawnFn command args
+
+foreign import spawnFn """
+function spawnFn(command, args, errback, callback) {
+  return function(){
+    var child_process = require('child_process');
+
+    var process = child_process.spawn(command, args);
+
+    var stdout = new Buffer(0);
+
+    var stderr = new Buffer(0);
+
+    process.stdout.on('data', function(data){
+      stdout = Buffer.concat([stdout, new Buffer(data)]);
+    });
+
+    process.stderr.on('data', function(data){
+      stderr = Buffer.concat([stderr, new Buffer(data)]);
+    });
+
+    process.on('close', function(code){
+      var chalk = require('chalk');
+
+      var output = stdout.toString('utf-8');
+
+      var error = stderr.toString('utf-8');
+
+      if (error.length > 0) {
+         console.error('\n' + chalk.red('*') + ' ' + error);
+      }
+
+      if (code !== 0) errback(new Error('Process terminated with code ' + code))();
+      else callback(output)();
+    });
+  };
+}
+""" :: forall eff. Fn4 String
+                       [String]
+                       (Error -> Eff (cp :: ChildProcess | eff) Unit)
+                       (String -> Eff (cp :: ChildProcess | eff) Unit)
+                       (Eff (cp :: ChildProcess | eff) Unit)