Add blocks from plugins to template engine

3 files changed, 88 insertions, 4 deletions

diff --git a/lib/plugin.js b/lib/plugin.js
index 79da7d7..2af81c6 100644
--- a/lib/plugin.js
+++ b/lib/plugin.js
@@ -135,6 +135,11 @@ Plugin.prototype.getFilters = function() {
         .value();
 };
 
+// Normalize blocks and return them
+Plugin.prototype.getBlocks = function() {
+    return this.infos.blocks || {};
+};
+
 // Test if it's a valid plugin
 Plugin.prototype.isValid = function() {
     var that = this;
diff --git a/lib/pluginslist.js b/lib/pluginslist.js
index d1d276d..a3d43e2 100644
--- a/lib/pluginslist.js
+++ b/lib/pluginslist.js
@@ -63,6 +63,11 @@ PluginsList.prototype.load = function(plugin, options) {
         that.book.template.addFilter(filterName, filterFunc);
     });
 
+    // Extract blocks
+	_.each(plugin.getBlocks(), function(block, blockName) {
+        that.book.template.addBlock(blockName, block);
+    });
+
 	return Q()
 	.then(function() {
 		return plugin.getResources(options.assetsBase);
diff --git a/lib/template.js b/lib/template.js
index 4b3fdbe..91cedca 100644
--- a/lib/template.js
+++ b/lib/template.js
@@ -74,11 +74,85 @@ TemplateEngine.prototype.addFilter = function(filterName, func) {
         this.env.getFilter(filterName);
         this.log.warn.ln("conflict in filters, '"+filterName+"' is already set");
         return false;
-    } catch(e) {
-        this.log.debug.ln("add filter '"+filterName+"'");
-        this.env.addFilter(filterName, func, true);
-        return true;
+    } catch(e) {}
+
+    this.log.debug.ln("add filter '"+filterName+"'");
+    this.env.addFilter(filterName, func, true);
+    return true;
+};
+
+// Add a block
+TemplateEngine.prototype.addBlock = function(name, block) {
+    var that = this;
+
+    block = _.defaults(block || {}, {
+        end: "end"+name,
+        process: _.identity,
+        blocks: []
+    });
+
+    var extName = 'Block'+name+'Extension';
+    if (this.env.getExtension(extName)) {
+        this.log.warn.ln("conflict in blocks, '"+extName+"' is already defined");
+        return false;
     }
+
+    this.log.debug.ln("add block '"+name+"'");
+
+    var Ext = function () {
+        this.tags = [name];
+
+        this.parse = function(parser, nodes, lexer) {
+            console.log("parse", name, block.end);
+            var bodies = {};
+
+            var tok = parser.nextToken();
+            var args = parser.parseSignature(null, true);
+            parser.advanceAfterBlockEnd(tok.value);
+
+            // parse the body and possibly the error block, which is optional
+            /*var body = parser.parseUntilBlocks('error', 'endtruncate');
+            var errorBody = null;
+
+            if(parser.skipSymbol('error')) {
+                parser.skip(lexer.TOKEN_BLOCK_END);
+                errorBody = parser.parseUntilBlocks('endremote');
+            }
+
+            parser.advanceAfterBlockEnd();*/
+
+            var body = parser.parseUntilBlocks(block.end);
+            parser.advanceAfterBlockEnd();
+
+            return new nodes.CallExtensionAsync(this, 'run', args, [body]);
+        };
+
+        this.run = function(context) {
+            var args = Array.prototype.slice.call(arguments, 1);
+            var callback = args.pop();
+            var bodies =  {} //args.pop();
+            var body = args.pop();
+            var kwargs = args.pop() || {};
+
+            Q()
+            .then(function() {
+                return block.process.call({
+                    ctx: context.ctx,
+                    book: that.book
+                }, {
+                    body: body(),
+                    args: args,
+                    kwargs: kwargs,
+                    bodies: bodies
+                });
+            })
+            .nodeify(callback)
+        };
+    };
+
+
+    // Add the Extension
+    this.env.addExtension(extName, new Ext());
 };
 
 // Render a string from the book