Add "Unknown node" type to core.

Relates to Issue #5
not the best/complete solution - but a start.

nodes/core/core/98-unknown.html

@@ -0,0 +1,49 @@
+<!--
+  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.
+-->
+
+<script type="text/x-red" data-template-name="unknown">
+    <div class="form-tips">This node is currently unknown to Node-RED. <i>DO NOT Deploy while in this state or the flow file may well be trashed...</i>. Usually this can be resolved by installing the npm module that this node relies on. To do this - stop Node-RED and restart. Look at the errors shown for one that matches this missing node. Stop Node-RED again and type <b>npm install {missing module name}</b>. Restart Node-RED, and hopefully this will have resolved it.</div>
+</script>
+
+<script type="text/x-red" data-help-name="unknown">
+    <p>This node is currently unknown to Node-RED.</p>
+    <p><i>DO NOT Deploy while in this state or the flow file may well be trashed...</i></p>
+    <p>Usually this can be resolved by installing the npm module that this node relies on. To do this, stop Node-RED and restart.</p>
+    <p>Look at the errors shown in the console for one that matches the name of this missing node.</p>
+    <p>Stop Node-RED again and type <b>npm install {missing module name}</b>. Restart Node-RED, and hopefully this will have resolved it.</p>
+    <p>If not then you will need to obtain that Node-RED module from somewhere... ask the author of the flow where they got it from.</p>
+    <p>(hopefully soon we will have a central repository where all nodes can be registered. work in progress.)</p>
+</script>
+
+<script type="text/javascript">
+    RED.nodes.registerType('unknown',{
+            category: 'unknown',
+            color:"#C00000",
+            defaults: {
+            name: {value:""},
+            foo: {value:"",required:true}
+        },
+        inputs:1,
+        outputs:1,
+        icon: "",
+        label: function() {
+            return this.name||"unknown";
+        },
+        labelStyle: function() {
+            return "node_label_white";
+        }
+    });
+</script>

nodes/core/core/98-unknown.js

@@ -0,0 +1,22 @@
+/**
+ * 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.
+ **/
+
+var RED = require(process.env.NODE_RED_HOME+"/red/red");
+
+function UnknownNode(n) {
+    RED.nodes.createNode(this,n);
+}
+RED.nodes.registerType("unknown",UnknownNode);

public/red/nodes.js

@@ -16,15 +16,12 @@
 RED.nodes = function() {
 
     var node_defs = {};
-    
     var nodes = [];
     var configNodes = {};
     var links = [];
-    
     var defaultWorkspace;
     var workspaces = {};
 
-    
     function registerType(nt,def) {
         node_defs[nt] = def;
         // TODO: too tightly coupled into palette UI
@@ -230,8 +227,10 @@ RED.nodes = function() {
                 // TODO: remove workspace in next release+1
                 if (n.type != "workspace" && n.type != "tab" && !getType(n.type)) {
                     // TODO: get this UI thing out of here! (see below as well)
-                    RED.notify("<strong>Failed to import nodes</strong>: unrecognised type '"+n.type+"'","error");
+                    RED.notify("<strong>Failed to import node</strong>: unrecognised type '"+n.type+"'<br/>DO NOT DEPLOY while in this state.<br/>Either, add missing types to Node-RED, restart and then reload page,<br/>or delete unknown ( "+n.type+" ), rewire as required, and then deploy.","error","true");
-                    return null;
+                    //return null;              //
+                    n.name = "( "+n.type+" )";  // DCJ - mod to make it load, but will lose all "self knowledge".
+                    n.type = "unknown";         //
                 }
             }
             for (var i in newNodes) {
@@ -373,5 +372,4 @@ RED.nodes = function() {
         nodes: nodes, // TODO: exposed for d3 vis
         links: links  // TODO: exposed for d3 vis
     };
-    
 }();