feat: add mermaid plugin

Author: pd4d10

packages/plugin-mermaid/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 Rongjian Zhang
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

packages/plugin-mermaid/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "@bytemd/plugin-mermaid",
+  "version": "0.0.1",
+  "description": "Mermaid plugin for bytemd",
+  "main": "dist/index.cjs.js",
+  "module": "dist/index.esm.js",
+  "types": "index.d.ts",
+  "svelte": "src/index.js",
+  "keywords": [],
+  "files": [
+    "dist",
+    "index.d.ts"
+  ],
+  "author": "Rongjian Zhang <pd4d10@gmail.com>",
+  "license": "MIT",
+  "dependencies": {
+    "mermaid": "^8.4.8"
+  },
+  "peerDependencies": {
+    "bytemd": "*"
+  }
+}

packages/plugin-mermaid/src/MermaidView.svelte

@@ -0,0 +1,19 @@
+<script>
+  import mermaid from 'mermaid'
+
+  export let value
+  let element
+
+  const id = 'mermaid' // TODO:
+
+  function insertSvg(svgCode, bindFunctions) {
+    element.innerHTML = svgCode;
+    if (bindFunctions) bindFunctions(element);
+  }
+
+  $: if (element) {
+    mermaid.render(id, value, insertSvg, element);
+  }
+</script>
+
+<div bind:this={element}></div>

packages/plugin-mermaid/src/index.js

@@ -0,0 +1,9 @@
+import MermaidView from './MermaidView.svelte';
+
+export default {
+  transformNode(node) {},
+  shouldTransformElement(node) {
+    return node.type === 'code' && node.lang === 'mermaid';
+  },
+  component: MermaidView
+};

rollup.config.js

@@ -17,6 +17,7 @@ const reactPkg = require('./packages/bytemd-react/package.json');
 const highlightPkg = require('./packages/plugin-highlight/package.json');
 const katexPkg = require('./packages/plugin-katex/package.json');
 const graphvizPkg = require('./packages/plugin-graphviz/package.json');
+const mermaidPkg = require('./packages/plugin-mermaid/package.json');
 
 function serve() {
   let started = false;
@@ -179,6 +180,28 @@ const configs = {
       commonjs(),
       production && terser()
     ]
+  },
+  'plugin-mermaid': {
+    input: 'src/index.js',
+    output: [
+      {
+        format: 'es',
+        file: mermaidPkg.module
+      },
+      {
+        format: 'cjs',
+        file: mermaidPkg.main
+      }
+    ],
+    plugins: [
+      svelte({ dev: !production }),
+      resolve({
+        browser: true,
+        dedupe: ['svelte']
+      }),
+      commonjs(),
+      production && terser()
+    ]
   }
 };