增加对mermaid流程图的支持 (#263)

_config.yml

@@ -338,6 +338,23 @@ plugins:
     min_js: <script defer src="https://gcore.jsdelivr.net/npm/katex@0.16.4/dist/katex.min.js" integrity="sha384-PwRUT/YqbnEjkZO0zZxNqcxACrXe+j766U2amXcgMg5457rve2Y7I6ZJSm2A0mS4" crossorigin="anonymous"></script>
     auto_render_min_js: <script defer src="https://gcore.jsdelivr.net/npm/katex@0.16.4/dist/contrib/auto-render.min.js" integrity="sha384-+VBxd3r6XgURycqtZ117nYw44OOcIax56Z4dCRWbxyPt0Koah1uHoK0o4+/RRE05" crossorigin="anonymous"onload="renderMathInElement(document.body);"></script>
 
+  # Mermaid - markdwon to flow chart, seq chart, class chart ...
+  # 需要安装 npm install --save hexo-filter-mermaid-diagrams
+  # 使用时 需要在Markdown文件开头加入 mermaid: true
+  # 使用示例：
+  # ```mermaid
+  # graph LR
+  #   A(Section A) -->|option 1| B(Section A)
+  #   B -->|option 2| C(Section C)
+  # ```
+  mermaid:
+    enable: false
+    # js: https://unpkg.com/mermaid@9.0.0/dist/mermaid.min.js
+    js: https://cdn.jsdelivr.net/npm/mermaid@v9/dist/mermaid.min.js
+    # Available themes: default | dark | forest | neutral
+    # 推荐使用 dark 主题 在夜间模式下显示效果更好
+    theme: dark
+
 style:
   darkmode: auto # auto / always / false
   smooth_scroll: true # true / false

layout/mermaid.ejs

@@ -0,0 +1,28 @@
+<% if (theme.plugins.mermaid.enable) { %>
+  <script type="text/javascript" src="<%- theme.plugins.mermaid.js %>"></script>
+
+  <script>
+    var mermaid_config = {
+      startOnLoad: true,
+      theme: '<%- theme.plugins.mermaid.theme %>',
+      logLevel: 3,
+      themeVariables: {
+        darkMode: true
+      },
+      flowchart: {
+        useMaxWidth: false,
+        htmlLabels: true,
+        curve: 'linear'
+      },
+      gantt: {
+        axisFormat: '%m/%d/%Y'
+      },
+      sequence: {
+        actorMargin: 50
+      }
+    }
+    if (window.mermaid) {
+        mermaid.initialize(mermaid_config);
+    }
+  </script>
+<% } %>

layout/post.ejs

@@ -22,6 +22,9 @@ if (theme.plugins.heti && theme.plugins.heti.enable) {
 <% if (page.mathjax == true){ %>
     <%- partial('mathjax') %>
 <% } %>
+<% if (page.mermaid == true){ %>
+  <%- partial('mermaid') %>
+<% } %>
 <%- partial('_partial/main/navbar/breadcrumb') %>
 <article class='md-text content<%- heti %> <%- post.layout %><%- post.indent ? ' indent' : '' %><%- scrollreveal() %>'>
 <%- layoutTitle() %>

source/css/_plugins/index.styl

@@ -9,6 +9,8 @@ if hexo-config('plugins.scrollreveal.enable')
   @import 'scrollreveal'
 if hexo-config('plugins.fancybox.enable')
   @import 'fancybox'
+if hexo-config('plugins.mermaid.enable')
+  @import 'mermaid'
 
 
 // 评论

source/css/_plugins/mermaid.styl

@@ -0,0 +1,10 @@
+pre.mermaid {
+  display: inline-block;
+  width: 100%;
+  text-align: center;
+}
+
+.mermaid svg {
+  width: 100%;
+  display: inline-block;
+}