PlantUML integration

src/config.default.json

@@ -8,7 +8,8 @@
     "rss": true,
     "webhook": true,
     "prism": true,
-    "mathjax": true
+    "mathjax": true,
+    "plantuml": true
   },
   "home": {
     "index": "index.ejs",
@@ -47,5 +48,8 @@
   "mathjax": {
     "output_format": "svg",
     "speak_text": true
+  },
+  "plantuml": {
+    "output_format": "svg"
   }
 }

src/renderer.js

@@ -1,4 +1,5 @@
 const fs = require('fs');
+const path = require('path');
 const showdown = require('showdown');
 
 module.exports = (config) => {
@@ -31,6 +32,25 @@ module.exports = (config) => {
     cb(data);
   };
 
+  if (config['modules']['plantuml']) {
+    require('./script_loader')(path.join(__dirname, 'lib', 'plantuml_synchro.js'));
+  }
+
+  const renderPlantUML = (data, cb) => {
+    if (!config['modules']['plantuml'])
+      return cb(data);
+    const umlRegex = /@startuml\r?\n((?:(?!@enduml)[\s\S])*)\r?\n@enduml/m;
+    let match;
+    while ((match = umlRegex.exec(data))) {
+      const code = match[1].trim();
+      const s = unescape(encodeURIComponent(code)); // jshint ignore:line
+      const compressed = global['zip_deflate'](s);
+      const url = `http://www.plantuml.com/plantuml/${config['plantuml']['output_format']}/${encode64(compressed)}`;// jshint ignore:line
+      data = data.slice(0, match.index) + `<img alt="generated PlantUML diagram" src="${url}">` + data.slice(match.index + match[0].length);
+    }
+    cb(data);
+  };
+
   let mjAPI;
   if (config['modules']['mathjax']) {
     mjAPI = require('mathjax-node');
@@ -81,16 +101,19 @@ module.exports = (config) => {
   return {
     renderShowDown: config['test'] ? renderShowDown : undefined,
     renderPrism: config['test'] ? renderPrism : undefined,
+    renderPlantUML: config['test'] ? renderPlantUML : undefined,
     renderMathJax: config['test'] ? renderMathJax : undefined,
     render: (file, cb) => {
       fs.readFile(file, {encoding: 'UTF-8'}, (err, data) => {
         if (err)
           return cb(err);
 
-        renderPrism(data, (data2) => {
-          renderMathJax(data2, (data3) => {
-            renderShowDown(data3, (html) => {
-              cb(null, html);
+        renderPrism(data, (data) => {
+          renderPlantUML(data, (data) => {
+            renderMathJax(data, (data) => {
+              renderShowDown(data, (html) => {
+                cb(null, html);
+              });
             });
           });
         });

src/script_loader.js

@@ -0,0 +1,10 @@
+const fs = require('fs');
+
+/**
+ * Import client-side script into the "global" var
+ * @param scriptPath
+ */
+module.exports = (scriptPath) => {
+  eval.call(global, fs.readFileSync(scriptPath, {encoding: 'UTF-8'}));
+};
+