From 2863c87507a4b88bbb2c7661d466fac6dbc4f46c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20Fr=C3=B6hlich?= <jan.froehlich@bechtle.com>
Date: Thu, 25 Apr 2024 11:13:36 +0200
Subject: [PATCH] feat: mermaid support

---
 docs/.vitepress/config.mts              |  12 ++-
 docs/.vitepress/mermaid-markdown-all.ts |  53 +++++++++
 docs/.vitepress/theme/Mermaid.vue       | 136 ++++++++++++++++++++++++
 docs/.vitepress/theme/index.ts          |  11 ++
 docs/.vitepress/theme/mermaid.ts        |   7 ++
 5 files changed, 214 insertions(+), 5 deletions(-)
 create mode 100644 docs/.vitepress/mermaid-markdown-all.ts
 create mode 100644 docs/.vitepress/theme/Mermaid.vue
 create mode 100644 docs/.vitepress/theme/index.ts
 create mode 100644 docs/.vitepress/theme/mermaid.ts

diff --git a/docs/.vitepress/config.mts b/docs/.vitepress/config.mts
index c9e109c..ee02494 100644
--- a/docs/.vitepress/config.mts
+++ b/docs/.vitepress/config.mts
@@ -1,18 +1,16 @@
 import { defineConfig } from 'vitepress'
-import { withMermaid } from "vitepress-plugin-mermaid";
+import MermaidExample from './mermaid-markdown-all';
 
 import { version } from "../../package.json";
 
 // https://vitepress.dev/reference/site-config
 export default
-  // withMermaid(
 
   defineConfig({
     title: "ABAP OData Framework",
     lang: 'en-US',
     base: '/odata-fw/',
     description: "A odata framework for a SAP System. ",
-
     head: [
       ['link', { rel: 'icon', href: '/favicon.ico' }],
       ['meta', { property: 'og:type', content: 'website' }],
@@ -24,6 +22,11 @@ export default
     sitemap: {
       hostname: "https://miggi92.github.io/odata-fw/"
     },
+    markdown: {
+      config: async (md) => {
+        await MermaidExample(md);
+      }
+    },
     themeConfig: {
       // https://vitepress.dev/reference/default-theme-config
       nav: nav(),
@@ -71,8 +74,7 @@ export default
       },
     }
   }
-    // )
-  );
+);
 
 function nav() {
   return [
diff --git a/docs/.vitepress/mermaid-markdown-all.ts b/docs/.vitepress/mermaid-markdown-all.ts
new file mode 100644
index 0000000..64a069b
--- /dev/null
+++ b/docs/.vitepress/mermaid-markdown-all.ts
@@ -0,0 +1,53 @@
+import type { MarkdownRenderer } from 'vitepress';
+
+const MermaidExample = async (md: MarkdownRenderer) => {
+  const defaultRenderer = md.renderer.rules.fence;
+
+  if (!defaultRenderer) {
+    throw new Error('defaultRenderer is undefined');
+  }
+
+  md.renderer.rules.fence = (tokens, index, options, env, slf) => {
+    const token = tokens[index];
+    const language = token.info.trim();
+    if (language.startsWith('mermaid')) {
+      const key = index;
+      return `
+      <Suspense> 
+      <template #default>
+      <Mermaid id="mermaid-${key}" :showCode="${
+        language === 'mermaid-example'
+      }" graph="${encodeURIComponent(token.content)}"></Mermaid>
+      </template>
+        <!-- loading state via #fallback slot -->
+        <template #fallback>
+          Loading...
+        </template>
+      </Suspense>
+`;
+    } else if (language === 'warning') {
+      return `<div class="warning custom-block"><p class="custom-block-title">WARNING</p><p>${token.content}}</p></div>`;
+    } else if (language === 'note') {
+      return `<div class="tip custom-block"><p class="custom-block-title">NOTE</p><p>${token.content}}</p></div>`;
+    } else if (language === 'regexp') {
+      // shiki doesn't yet support regexp code blocks, but the javascript
+      // one still makes RegExes look good
+      token.info = 'javascript';
+      // use trimEnd to move trailing `\n` outside if the JavaScript regex `/` block
+      token.content = `/${token.content.trimEnd()}/\n`;
+      return defaultRenderer(tokens, index, options, env, slf);
+    } else if (language === 'jison') {
+      return `<div class="language-">
+      <button class="copy"></button>
+      <span class="lang">jison</span>
+      <pre>
+      <code>${token.content.replace(/</g, '&lt;').replace(/>/g, '&gt;')}</code>
+      </pre>
+      </div>`;
+    }
+
+    return defaultRenderer(tokens, index, options, env, slf);
+  };
+};
+
+export default MermaidExample;
diff --git a/docs/.vitepress/theme/Mermaid.vue b/docs/.vitepress/theme/Mermaid.vue
new file mode 100644
index 0000000..b98c493
--- /dev/null
+++ b/docs/.vitepress/theme/Mermaid.vue
@@ -0,0 +1,136 @@
+<template>
+  <div v-if="props.showCode">
+    <h5>Code:</h5>
+    <div class="language-mermaid">
+      <button class="copy"></button>
+      <span class="lang">mermaid</span>
+      <pre><code :contenteditable="contentEditable" @input="updateCode"  @keydown.meta.enter="renderChart" @keydown.ctrl.enter="renderChart" ref="editableContent" class="editable-code"></code></pre>
+      <div class="buttons-container">
+        <span>{{ ctrlSymbol }} + Enter</span><span>|</span>
+        <button @click="renderChart">Run ▶</button>
+      </div>
+    </div>
+  </div>
+  <div v-html="svg"></div>
+</template>
+
+<script setup>
+import { onMounted, onUnmounted, ref } from 'vue';
+import { render } from './mermaid';
+
+const props = defineProps({
+  graph: {
+    type: String,
+    required: true,
+  },
+  id: {
+    type: String,
+    required: true,
+  },
+  showCode: {
+    type: Boolean,
+    default: true,
+  },
+});
+
+const svg = ref('');
+const code = ref(decodeURIComponent(props.graph));
+const ctrlSymbol = ref(navigator.platform.includes('Mac') ? '⌘' : 'Ctrl');
+const editableContent = ref(null);
+const isFirefox = navigator.userAgent.toLowerCase().includes('firefox');
+const contentEditable = ref(isFirefox ? 'true' : 'plaintext-only');
+
+let mut = null;
+
+const updateCode = (event) => {
+  code.value = event.target.innerText;
+};
+
+onMounted(async () => {
+  mut = new MutationObserver(() => renderChart());
+  mut.observe(document.documentElement, { attributes: true });
+
+  if (editableContent.value) {
+    // Set the initial value of the contenteditable element
+    // We cannot bind using `{{ code }}` because it will rerender the whole component
+    // when the value changes, shifting the cursor when enter is used
+    editableContent.value.textContent = code.value;
+  }
+
+  await renderChart();
+
+  //refresh images on first render
+  const hasImages = /<img([\w\W]+?)>/.exec(code.value)?.length > 0;
+  if (hasImages)
+    setTimeout(() => {
+      let imgElements = document.getElementsByTagName('img');
+      let imgs = Array.from(imgElements);
+      if (imgs.length) {
+        Promise.all(
+          imgs
+            .filter((img) => !img.complete)
+            .map(
+              (img) =>
+                new Promise((resolve) => {
+                  img.onload = img.onerror = resolve;
+                })
+            )
+        ).then(() => {
+          renderChart();
+        });
+      }
+    }, 100);
+});
+
+onUnmounted(() => mut.disconnect());
+
+const renderChart = async () => {
+  console.log('rendering chart' + props.id + code.value);
+  const hasDarkClass = document.documentElement.classList.contains('dark');
+  const mermaidConfig = {
+    securityLevel: 'loose',
+    startOnLoad: false,
+    theme: hasDarkClass ? 'dark' : 'default',
+  };
+  let svgCode = await render(props.id, code.value, mermaidConfig);
+  // This is a hack to force v-html to re-render, otherwise the diagram disappears
+  // when **switching themes** or **reloading the page**.
+  // The cause is that the diagram is deleted during rendering (out of Vue's knowledge).
+  // Because svgCode does NOT change, v-html does not re-render.
+  // This is not required for all diagrams, but it is required for c4c, mindmap and zenuml.
+  const salt = Math.random().toString(36).substring(7);
+  svg.value = `${svgCode} <span style="display: none">${salt}</span>`;
+};
+</script>
+
+<style>
+.editable-code:focus {
+  outline: none; /* Removes the default focus indicator */
+}
+
+.buttons-container {
+  position: absolute;
+  bottom: 0;
+  right: 0;
+  z-index: 1;
+  padding: 0.5rem;
+  display: flex;
+  gap: 0.5rem;
+}
+
+.buttons-container > span {
+  cursor: default;
+  opacity: 0.5;
+  font-size: 0.8rem;
+}
+
+.buttons-container > button {
+  color: #007bffbf;
+  font-weight: bold;
+  cursor: pointer;
+}
+
+.buttons-container > button:hover {
+  color: #007bff;
+}
+</style>
diff --git a/docs/.vitepress/theme/index.ts b/docs/.vitepress/theme/index.ts
new file mode 100644
index 0000000..c0ce460
--- /dev/null
+++ b/docs/.vitepress/theme/index.ts
@@ -0,0 +1,11 @@
+import DefaultTheme from 'vitepress/theme';
+import Mermaid from './Mermaid.vue';
+import type { EnhanceAppContext } from 'vitepress';
+
+export default {
+  ...DefaultTheme,
+  enhanceApp({ app }: EnhanceAppContext) {
+    // register global components
+    app.component('Mermaid', Mermaid);
+  },
+};
diff --git a/docs/.vitepress/theme/mermaid.ts b/docs/.vitepress/theme/mermaid.ts
new file mode 100644
index 0000000..4752a1c
--- /dev/null
+++ b/docs/.vitepress/theme/mermaid.ts
@@ -0,0 +1,7 @@
+import mermaid, { type MermaidConfig } from 'mermaid';
+
+export const render = async (id: string, code: string, config: MermaidConfig): Promise<string> => {
+  mermaid.initialize(config);
+  const { svg } = await mermaid.render(id, code);
+  return svg;
+};