docs: fix broken line numbers

docs/.eleventy.js

@@ -10,7 +10,7 @@ const Image = require("@11ty/eleventy-img");
 const path = require("path");
 const { slug } = require("github-slugger");
 const yaml = require("js-yaml");
-
+const { highlighter, preWrapperPlugin, lineNumberPlugin } = require("./mdSyntaxHighlighter");
 const {
     DateTime
 } = require("luxon");
@@ -145,7 +145,8 @@ module.exports = function(eleventyConfig) {
 
     eleventyConfig.addPlugin(eleventyNavigationPlugin);
     eleventyConfig.addPlugin(syntaxHighlight, {
-        alwaysWrapLineHighlights: true
+        alwaysWrapLineHighlights: true,
+        templateFormats: ["liquid", "njk"]
     });
     eleventyConfig.addPlugin(pluginRss);
     eleventyConfig.addPlugin(pluginTOC, {
@@ -186,30 +187,32 @@ module.exports = function(eleventyConfig) {
     }
 
     const markdownIt = require("markdown-it");
+    const md = markdownIt({ html: true, linkify: true, typographer: true, highlight: (str, lang) => highlighter(md, str, lang) })
+        .use(markdownItAnchor, {
+            slugify
+        })
+        .use(markdownItContainer, "correct", {})
+        .use(markdownItContainer, "incorrect", {})
+        .use(markdownItContainer, "warning", {
+            render(tokens, idx) {
+                return generateAlertMarkup("warning", tokens, idx);
+            }
+        })
+        .use(markdownItContainer, "tip", {
+            render(tokens, idx) {
+                return generateAlertMarkup("tip", tokens, idx);
+            }
+        })
+        .use(markdownItContainer, "important", {
+            render(tokens, idx) {
+                return generateAlertMarkup("important", tokens, idx);
+            }
+        })
+        .use(preWrapperPlugin)
+        .use(lineNumberPlugin)
+        .disable("code");
 
-    eleventyConfig.setLibrary("md",
-        markdownIt({ html: true, linkify: true, typographer: true })
-            .use(markdownItAnchor, {
-                slugify
-            })
-            .use(markdownItContainer, "correct", {})
-            .use(markdownItContainer, "incorrect", {})
-            .use(markdownItContainer, "warning", {
-                render(tokens, idx) {
-                    return generateAlertMarkup("warning", tokens, idx);
-                }
-            })
-            .use(markdownItContainer, "tip", {
-                render(tokens, idx) {
-                    return generateAlertMarkup("tip", tokens, idx);
-                }
-            })
-            .use(markdownItContainer, "important", {
-                render(tokens, idx) {
-                    return generateAlertMarkup("important", tokens, idx);
-                }
-            })
-            .disable("code"));
+    eleventyConfig.setLibrary("md", md);
 
     //------------------------------------------------------------------------------
     // Shortcodes

docs/mdSyntaxHighlighter.js

@@ -0,0 +1,81 @@
+/** @typedef {import("markdown-it")} MarkdownIt */
+
+const Prism = require("prismjs");
+const loadLanguages = require("prismjs/components/");
+
+/**
+ *
+ * @param {MarkdownIt} md markdown-it
+ * @param {string} str code
+ * @param {string} lang code language
+ * @returns
+ */
+const highlighter = function (md, str, lang) {
+    let result = "";
+    if (lang) {
+        try {
+            loadLanguages([lang]);
+            result = Prism.highlight(str, Prism.languages[lang], lang);
+        } catch (err) {
+            console.log(err);
+        }
+    } else {
+        result = md.utils.escapeHtml(str);
+    }
+
+    return `<pre><code>${result}</code></pre>`;
+};
+
+/**
+ *
+ * modified from https://github.com/vuejs/vitepress/blob/main/src/node/markdown/plugins/preWrapper.ts
+ * @param {MarkdownIt} md
+ */
+const preWrapperPlugin = (md) => {
+    const fence = md.renderer.rules.fence;
+    md.renderer.rules.fence = (...args) => {
+        const [tokens, idx] = args;
+        const lang = tokens[idx].info.trim();
+        const rawCode = fence(...args);
+        return `<div class="language-${lang}">${rawCode}</div>`;
+    };
+};
+
+/**
+ *
+ * modified from https://github.com/vuejs/vitepress/blob/main/src/node/markdown/plugins/lineNumbers.ts
+ * @param {MarkdownIt} md
+ */
+const lineNumberPlugin = (md) => {
+    const fence = md.renderer.rules.fence;
+    md.renderer.rules.fence = (...args) => {
+        const [tokens, idx] = args;
+        const lang = tokens[idx].info.trim();
+        const rawCode = fence(...args);
+        const code = rawCode.slice(
+            rawCode.indexOf("<code>"),
+            rawCode.indexOf("</code>")
+        );
+        const lines = code.split("\n");
+        const lineNumbersCode = [...Array(lines.length - 1)]
+            .map(
+                (line, index) =>
+                    `<span class="line-number">${index + 1}</span><br>`
+            )
+            .join("");
+
+        const lineNumbersWrapperCode = `<div class="line-numbers-wrapper">${lineNumbersCode}</div>`;
+
+        const finalCode = rawCode
+            .replace(/<\/div>$/, `${lineNumbersWrapperCode}</div>`)
+            .replace(/"(language-\S*?)"/, '"$1 line-numbers-mode"')
+            .replace(/<code>/, `<code class="language-${lang}">`)
+            .replace(/<pre>/, `<pre class="language-${lang}">`);
+
+        return finalCode;
+    };
+};
+
+module.exports.highlighter = highlighter;
+module.exports.preWrapperPlugin = preWrapperPlugin;
+module.exports.lineNumberPlugin = lineNumberPlugin;

docs/package.json

@@ -42,6 +42,7 @@
         "netlify-cli": "^10.3.1",
         "npm-run-all": "^4.1.5",
         "postcss-html": "^1.5.0",
+        "prismjs": "^1.29.0",
         "rimraf": "^3.0.2",
         "sass": "^1.52.1",
         "stylelint": "^14.13.0",

docs/src/assets/scss/syntax-highlighter.scss

@@ -32,7 +32,7 @@ pre[class*="language-"] {
 }
 
 /* Code blocks */
-pre[class*="language-"] {
+div[class*="language-"] {
     padding: 1.5rem;
     margin: 1.5rem 0;
     overflow: auto;
@@ -52,8 +52,8 @@ pre[class*="language-"] {
 
 /* Inline code */
 :not(pre) > code[class*="language-"] {
-    padding: .1em;
-    border-radius: .3em;
+    padding: 0.1em;
+    border-radius: 0.3em;
     white-space: normal;
 }
 
@@ -69,7 +69,7 @@ pre[class*="language-"] {
 }
 
 .token.namespace {
-    opacity: .7;
+    opacity: 0.7;
 }
 
 .token.selector,
@@ -100,25 +100,32 @@ pre[class*="language-"] {
     cursor: help;
 }
 
-pre {
-    counter-reset: lineNumber;
-}
-
-code .highlight-line {
-    font-variant-ligatures: none;
+.line-numbers-wrapper {
+    position: absolute;
+    top: 0;
+    text-align: right;
+    padding-top: 1.5rem;
+    font-size: 1em;
+    font-family: var(--mono-font), Consolas, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
+    line-height: 1.5;
+    color: var(--icon-color);
 }
 
-code .highlight-line::before {
-    -webkit-user-select: none;
+.line-number {
+    user-select: none;
     color: var(--icon-color);
-    content: counter(lineNumber);
-    counter-increment: lineNumber;
     display: inline-block;
     font-variant-numeric: tabular-nums;
-    margin-right: 1.2em;
-    padding-right: 1.2em;
-    margin-inline-end: 1.2em;
-    padding-inline-end: 1.2em;
     text-align: right;
-    width: 2.4em;
+    width: 1.2em;
+}
+
+div[class*="language-"].line-numbers-mode {
+    position: relative;
+}
+
+div[class*="language-"].line-numbers-mode pre[class*="language-"] {
+    padding-left: calc(2.4em + 1.2rem);
+    margin-top: 0;
+    margin-bottom: 0;
 }