add support for mermaid diagram to markdown editor

packages/node_modules/@node-red/editor-api/lib/editor/editor-libs.js

@@ -0,0 +1,33 @@
+// Dynamic loading support for editor libraries
+
+var apiUtils = require("../util");
+var fs = require("fs");
+var path = require("path");
+
+var lib2path = {
+    "mermaid": "../../../editor-client/public/vendor/mermaid/mermaid.min.js",
+};
+
+module.exports = {
+    init: function(_settings, _runtimeAPI) {
+        settings = _settings;
+    },
+
+    get: function(req,res) {
+        var name = req.params.name;
+
+        if (name in lib2path) {
+            try {
+                var lib = path.join(__dirname, lib2path[name]);
+                var code = fs.readFileSync(lib);
+                res.send(code);
+            }
+            catch (e) {
+                res.status(500).json({code: "runtime_error", message: e.toString()});
+            }
+        }
+        else {
+            res.status(400).json({code: "invalid_request", message: `no library: ${name}`});
+        }
+    },
+}

packages/node_modules/@node-red/editor-api/lib/editor/index.js

@@ -116,6 +116,11 @@ module.exports = {
             // SSH keys
             editorApp.use("/settings/user/keys",needsPermission("settings.write"),info.sshkeys());
 
+            // Editor Libraries
+            var editorLibs = require("./editor-libs");
+            editorLibs.init(settings, runtimeAPI);
+            editorApp.get("/editor-libs/:name", needsPermission("editor-libs.read"), editorLibs.get, apiUtil.errorHandler);
+
             return editorApp;
         }
     },