issue #21: Dump arch / plan to Graphviz formats

lib/arch.js

@@ -360,6 +360,18 @@ module.exports = INHERIT({
                 }, this).join('')
     },
 
+    /**
+     * Dump this arch to Graphviz string for debug purposes.
+     *
+     * @returns {String} Graphviz string representation of this arch.
+     */
+    toGraphviz: function() {
+        return 'digraph G {\n' +
+            this.findRoots().map(function(r) {
+                    return this.nodeToGraphviz(r)
+                }, this).join('') + '}\n';
+    },
+
     /**
      * Dump node with its children to string.
      *
@@ -373,6 +385,27 @@ module.exports = INHERIT({
             this.children[id].map(function(c) {
                     return spaces + this.nodeToString(c, spaces + ' ')
                 }, this).join('')
+    },
+
+    /**
+     * Dump node with its children to Graphviz string.
+     *
+     * @param {String} id Node ID to dump.
+     */
+    nodeToGraphviz: function(id) {
+        var _this = this,
+            thisNode = '"' + id + '"',
+            s = '    ' + thisNode + ';\n',
+            children = this.children[id] || [];
+
+        children.forEach(function(child) {
+            s += '    ' + thisNode + ' -> "' + child + '";\n';
+        });
+        children.forEach(function(child) {
+            s += _this.nodeToGraphviz(child);
+        });
+
+        return s;
     }
 
 });