enhancement: support mermaid diagram

_config.yml

@@ -131,3 +131,10 @@ copyright:
   license: '本文采用<a rel="license" href="http://creativecommons.org/licenses/by-nc/4.0/">知识共享署名-非商业性使用 4.0 国际许可协议</a>进行许可'
 # Blog page article timeliness days reminder, 0 for no threshold
 outdated_threshold: 0
+
+# mermaid chart
+mermaid: ## mermaid url https://github.com/knsv/mermaid
+  enable: true  # default true
+  version: "7.1.2" # default v7.1.2
+  options:  # find more api options from https://github.com/knsv/mermaid/blob/master/src/mermaidAPI.js
+    #startOnload: true  // default true

layout/_partial/base-footer.ejs

@@ -20,4 +20,13 @@
     <% } %>
     </div>
     <% } %>
+		<!-- mermaid -->
+		<% if (theme.mermaid.enable) { %>
+			<script src='https://unpkg.com/mermaid@<%= theme.mermaid.version %>/dist/mermaid.min.js'></script>
+			<script>
+				if (window.mermaid) {
+					mermaid.initialize({theme: 'forest'});
+				}
+			</script>
+		<% } %>		
 </footer>