[WIP] modularization (#984)

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/asyncify.js b/lib/asyncify.js
new file mode 100644
index 0000000..6fdc62d
--- /dev/null
+++ b/lib/asyncify.js
@@ -0,0 +1,26 @@
+'use strict';
+
+import isObject from 'lodash/lang/isObject';
+import restParam from 'lodash/function/restParam';
+
+export default function asyncify(func) {
+    return restParam(function (args) {
+        var callback = args.pop();
+        var result;
+        try {
+            result = func.apply(this, args);
+        } catch (e) {
+            return callback(e);
+        }
+        // if result is Promise object
+        if (isObject(result) && typeof result.then === 'function') {
+            result.then(function(value) {
+                callback(null, value);
+            })['catch'](function(err) {
+                callback(err.message ? err : new Error(err));
+            });
+        } else {
+            callback(null, result);
+        }
+    });
+}