更新

themes/butterfly/layout/includes/third-party/math/index.pug

@@ -0,0 +1,18 @@
+if theme.mathjax && theme.mathjax.enable
+  if theme.mathjax.per_page
+    if(!is_tag() && !is_category() && !is_archive() && !is_home())
+      include ./mathjax.pug
+  else
+    if page.mathjax
+      include ./mathjax.pug
+
+if theme.katex && theme.katex.enable
+  if theme.katex.per_page
+    if(!is_tag() && !is_category() && !is_archive() && !is_home())
+      include ./katex.pug
+  else
+    if page.katex
+      include ./katex.pug
+
+if theme.mermaid.enable
+  include ./mermaid.pug

themes/butterfly/layout/includes/third-party/math/katex.pug

@@ -0,0 +1,7 @@
+link(rel="stylesheet" type="text/css" href=theme.CDN.katex)
+script(src=url_for(theme.CDN.katex_copytex))
+link(rel="stylesheet" type="text/css" href=theme.CDN.katex_copytex_css)
+script.
+  $(function () {
+    $('span.katex-display').wrap('<div class="katex-wrap"></div>')
+  })

themes/butterfly/layout/includes/third-party/math/mathjax.pug

@@ -0,0 +1,53 @@
+//- Mathjax 3
+//- http://docs.mathjax.org/en/latest/upgrading/v2.html#changes-in-the-mathjax-api
+//- https://github.com/mathjax/MathJax/issues/2209
+//- http://docs.mathjax.org/en/latest/options/input/tex.html#the-configuration-block
+//- http://docs.mathjax.org/en/latest/web/typeset.html#resetting-automatic-equation-numbering
+
+script.
+  if (!window.MathJax) {
+    window.MathJax = {
+      loader: {
+        source: {
+          '[tex]/amsCd': '[tex]/amscd'
+        }
+      },
+      tex: {
+        inlineMath: [ ['$','$'], ["\\(","\\)"]],
+        tags: 'ams'
+      },
+      options: {
+        renderActions: {
+          findScript: [10, doc => {
+            for (const node of document.querySelectorAll('script[type^="math/tex"]')) {
+              const display = !!node.type.match(/; *mode=display/)
+              const math = new doc.options.MathItem(node.textContent, doc.inputJax[0], display)
+              const text = document.createTextNode('')
+              node.parentNode.replaceChild(text, node)
+              math.start = {node: text, delim: '', n: 0}
+              math.end = {node: text, delim: '', n: 0}
+              doc.math.push(math)
+            }
+          }, ''],
+          addClass: [200,() => {
+            document.querySelectorAll('mjx-container:not([display=\'true\']').forEach( node => {
+              const target = node.parentNode
+              if (!target.classList.contains('has-jax')) {
+                target.classList.add('mathjax-overflow')
+              }
+            })
+          }, '', false]
+        }
+      }
+    }
+    
+    const script = document.createElement('script')
+    script.src = '!{theme.CDN.mathjax}'
+    script.id = 'MathJax-script'
+    script.async = true
+    document.head.appendChild(script)
+  } else {
+    MathJax.startup.document.state(0)
+    MathJax.texReset()
+    MathJax.typeset()
+  }

themes/butterfly/layout/includes/third-party/math/mermaid.pug

@@ -0,0 +1,15 @@
+script.
+  if (document.getElementsByClassName('mermaid').length) {
+    if (window.mermaidJsLoad) mermaid.init()
+    else {
+      $.getScript('!{theme.CDN.mermaid}', function () {
+        window.mermaidJsLoad = true
+        mermaid.initialize({
+          theme: '!{theme.mermaid.theme}',
+        })
+        !{theme.pjax.enable} && mermaid.init()
+      })
+    }
+  }
+
+