[CCSDK-28] populated the seed code for dgbuilder

[ccsdk/distribution.git] / dgbuilder / core_nodes / io / 23-watch.js

diff --git a/dgbuilder/core_nodes/io/23-watch.js b/dgbuilder/core_nodes/io/23-watch.js
new file mode 100644 (file)
index 0000000..8a17f5a
--- /dev/null
+++ b/dgbuilder/core_nodes/io/23-watch.js
@@ -0,0 +1,51 @@
+/**
+ * Copyright 2013 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+module.exports = function(RED) {
+    "use strict";
+    var Notify = require("fs.notify");
+    var fs = require("fs");
+    var sep = require("path").sep;
+
+    function WatchNode(n) {
+        RED.nodes.createNode(this,n);
+
+        this.files = n.files.split(",");
+        for (var f =0; f < this.files.length; f++) {
+            this.files[f] = this.files[f].trim();
+        }
+        this.p = (this.files.length == 1) ? this.files[0] : JSON.stringify(this.files);
+        var node = this;
+
+        var notifications = new Notify(node.files);
+        notifications.on('change', function (file, event, path) {
+            try {
+                if (fs.statSync(path).isDirectory()) { path = path + sep + file; }
+            } catch(e) { }
+            var msg = { payload: path, topic: node.p, file: file };
+            node.send(msg);
+        });
+
+        notifications.on('error', function (error, path) {
+            node.warn(error);
+        });
+
+        this.close = function() {
+            notifications.close();
+        }
+    }
+    RED.nodes.registerType("watch",WatchNode);
+}