Merge pull request #1867 from bromagosa/download-stacks

Download script (as a hidden menu item)

blocks.js

@@ -2589,6 +2589,26 @@ BlockMorph.prototype.userMenu = function () {
         },
         'open a new window\nwith a picture of this script'
     );
+    if (shiftClicked) {
+        menu.addItem(
+            'download script',
+            function () {
+                var ide = myself.parentThatIsA(IDE_Morph),
+                    blockEditor = myself.parentThatIsA(BlockEditorMorph);
+                if (!ide && blockEditor) {
+                    ide = blockEditor.target.parentThatIsA(IDE_Morph);
+                }
+                if (ide) {
+                    ide.saveXMLAs(
+                        ide.serializer.serialize(myself),
+                        myself.selector + ' script',
+                        false);
+                }
+            },
+            'download this script\nas an XML file',
+            new Color(100, 0, 0)
+            );
+    }
     if (proc) {
         if (vNames.length) {
             menu.addLine();

gui.js

@@ -1904,6 +1904,9 @@ IDE_Morph.prototype.droppedText = function (aString, name) {
     if (aString.indexOf('<media') === 0) {
         return this.openMediaString(aString);
     }
+    if (aString.indexOf('<script') === 0) {
+        return this.openScriptString(aString);
+    }
 };
 
 IDE_Morph.prototype.droppedBinary = function (anArrayBuffer, name) {
@@ -4278,6 +4281,60 @@ IDE_Morph.prototype.openMediaString = function (str) {
     this.showMessage('Imported Media Module.', 2);
 };
 
+IDE_Morph.prototype.openScriptString = function (str) {
+    var msg,
+        myself = this;
+    this.nextSteps([
+        function () {
+            msg = myself.showMessage('Opening script...');
+        },
+        function () {nop(); }, // yield (bug in Chrome)
+        function () {
+            myself.rawOpenScriptString(str);
+        },
+        function () {
+            msg.destroy();
+        }
+    ]);
+};
+
+IDE_Morph.prototype.rawOpenScriptString = function (str) {
+    var xml,
+        script,
+        scripts = this.currentSprite.scripts,
+        world = this.world(),
+        dropPosition = world.hand.position(),
+        myself = this;
+
+    if (Process.prototype.isCatchingErrors) {
+        try {
+            xml = this.serializer.parse(str, this.currentSprite);
+            script = this.serializer.loadScript(xml, this.currentSprite);
+        } catch (err) {
+            this.showMessage('Load failed: ' + err);
+        }
+    } else {
+        xml = this.serializer.loadScript(str, this.currentSprite);
+        script = this.serializer.loadScript(xml, this.currentSprite);
+    }
+
+    scripts.add(script);
+
+    if (world.topMorphAt(dropPosition) !== scripts) {
+        dropPosition = new Point(
+            scripts.left() + scripts.cleanUpMargin,
+            scripts.top() + scripts.cleanUpMargin);
+    }
+
+    script.setCenter(dropPosition);
+    scripts.adjustBounds();
+
+    this.showMessage(
+        'Imported Script.',
+        2
+    );
+};
+
 IDE_Morph.prototype.openProject = function (name) {
     var str;
     if (name) {

store.js

@@ -1116,7 +1116,7 @@ SnapSerializer.prototype.loadBlock = function (model, isReporter, object) {
     } else if (model.tag === 'custom-block') {
         isGlobal = model.attributes.scope ? false : true;
         receiver = isGlobal ? this.project.stage : object;
-        if (isGlobal) {
+        if (isGlobal && receiver) {
             info = detect(receiver.globalBlocks, function (block) {
                 return block.blockSpec() === model.attributes.s;
             });
@@ -1128,7 +1128,7 @@ SnapSerializer.prototype.loadBlock = function (model, isReporter, object) {
                     }
                 );
             }
-        } else {
+        } else if (receiver) {
             // lookup in inherited methods
             info = detect(receiver.customBlocks, function (block) {
                 return block.blockSpec() === model.attributes.s;