Add code blocks normalization

lib/page/html.js

@@ -25,6 +25,9 @@ function HTMLPipeline(htmlString, opts) {
         // Output an image
         onImage: _.identity,
 
+        // Syntax highlighting
+        onCodeBlock: _.identity,
+
         // Output a svg, if returns null the svg is kept inlined
         onOutputSVG: _.constant(null)
     });
@@ -39,20 +42,28 @@ function HTMLPipeline(htmlString, opts) {
     });
 }
 
-// Normalize links
-HTMLPipeline.prototype.normalizeLinks = function() {
+// Transform a query of elements in the page
+HTMLPipeline.prototype._transform = function(query, fn) {
     var that = this;
 
-    this.$('a').each(function() {
-        var $a = that.$(this);
+    var $elements = this.$(query);
 
+    return Promise.serie($elements, function(el) {
+        var $el = that.$(el);
+        return fn.call(that, $el);
+    });
+};
+
+// Normalize links
+HTMLPipeline.prototype.transformLinks = function() {
+    return this._transform('a', function($a) {
         var href = $a.attr('href');
         if (!href) return;
 
         if (location.isAnchor(href)) {
             // Don't "change" anchor links
         } else if (location.isRelative(href)) {
-            $a.attr('href', that.opts.onRelativeLink(href));
+            $a.attr('href', this.opts.onRelativeLink(href));
         } else {
             // External links
             $a.attr('target', '_blank');
@@ -61,23 +72,50 @@ HTMLPipeline.prototype.normalizeLinks = function() {
 };
 
 // Normalize images
-HTMLPipeline.prototype.normalizeImages = function() {
-    var that = this;
-
-    var $imgs = this.$('img');
-
-    return Promise.serie($imgs, function(img) {
-        var $img = that.$(img);
-
-        return Promise(that.opts.onImage($img.attr('src')))
+HTMLPipeline.prototype.transformImages = function() {
+    return this._transform('img', function($img) {
+        return Promise(this.opts.onImage($img.attr('src')))
         .then(function(filename) {
             $img.attr('src', filename);
         });
     });
 };
 
+// Normalize code blocks
+HTMLPipeline.prototype.transformCodeBlocks = function() {
+    return this._transform('code', function($code) {
+        // Extract language
+        var lang = _.chain(
+                ($code.attr('class') || '').split(' ')
+            )
+            .map(function(cl) {
+                // Markdown
+                if (cl.search('lang-') === 0) return cl.slice('lang-'.length);
+
+                // Asciidoc
+                if (cl.search('language-') === 0) return cl.slice('language-'.length);
+
+                return null;
+            })
+            .compact()
+            .first()
+            .value();
+
+        var source = $code.text();
+
+        return Promise(this.opts.onCodeBlock(source, lang))
+        .then(function(blk) {
+            if (blk.html === false) {
+                $code.text(blk.body);
+            } else {
+                $code.html(blk.body);
+            }
+        });
+    });
+};
+
 // Add ID to headings
-HTMLPipeline.prototype.addHeadingIDs = function() {
+HTMLPipeline.prototype.transformHeadings = function() {
     var that = this;
 
     this.$('h1,h2,h3,h4,h5,h6').each(function() {
@@ -90,23 +128,18 @@ HTMLPipeline.prototype.addHeadingIDs = function() {
 };
 
 // Outline SVG from the HML
-HTMLPipeline.prototype.outlineSVG = function() {
-    var that = this;
-
-    var $svgs = this.$('svg');
-
-    return Promise.serie($svgs, function(svg) {
-        var $svg = that.$(svg);
+HTMLPipeline.prototype.transformSvgs = function() {
+    return this._transform('svg', function($svg) {
         var content = [
             '<?xml version="1.0" encoding="UTF-8"?>',
-            renderDOM(that.$, $svg)
+            renderDOM(this.$, $svg)
         ].join('\n');
 
-        return Promise(that.opts.onOutputSVG(content))
+        return Promise(this.opts.onOutputSVG(content))
         .then(function(filename) {
             if (!filename) return;
 
-            $svg.replaceWith(that.$('<img>').attr('src', filename));
+            $svg.replaceWith(this.$('<img>').attr('src', filename));
         });
     });
 };
@@ -116,10 +149,11 @@ HTMLPipeline.prototype.output = function() {
     var that = this;
 
     return Promise()
-    .then(this.normalizeLinks)
-    .then(this.normalizeImages)
-    .then(this.addHeadingIDs)
-    .then(this.outlineSVG)
+    .then(this.transformLinks)
+    .then(this.transformImages)
+    .then(this.transformHeadings)
+    .then(this.transformCodeBlocks)
+    .then(this.transformSvgs)
     .then(function() {
         return renderDOM(that.$);
     });

lib/page/index.js

@@ -144,7 +144,17 @@ Page.prototype.parse = function(output) {
         var pipelineOpts = {
             onRelativeLink: _.partial(output.onRelativeLink, that),
             onImage: _.partial(output.onOutputImage, that),
-            onOutputSVG: _.partial(output.onOutputSVG, that)
+            onOutputSVG: _.partial(output.onOutputSVG, that),
+
+            // Use 'code' template block
+            onCodeBlock: function(source, lang) {
+                return output.template.applyBlock('code', {
+                    body: source,
+                    kwargs: {
+                        language: lang
+                    }
+                });
+            }
         };
         var pipeline = new HTMLPipeline(that.content, pipelineOpts);