add server sided code highlighting from shiki

package-lock.json

···
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+      "license": "MIT",
+      "dependencies": {
+        "regex-utilities": "^2.3.0"
+      }
+    },
+    "node_modules/regex-recursion": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/regex-recursion/-/regex-recursion-6.0.2.tgz",
+      "integrity": "sha512-0YCaSCq2VRIebiaUviZNs0cBz1kg5kVS2UKUfNIx8YVs1cN3AV7NTctO5FOKBA+UT2BPJIWZauYHPqJODG50cg==",
+      "license": "MIT",
+      "dependencies": {
+        "regex-utilities": "^2.3.0"
+      }
+    },
+    "node_modules/regex-utilities": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/regex-utilities/-/regex-utilities-2.3.0.tgz",
+      "integrity": "sha512-8VhliFJAWRaUiVvREIiW2NXXTmHs4vMNnSzuJVhscgmGav3g9VDxLrQndI3dZZVVdp0ZO/5v0xmX516/7M9cng==",
+      "license": "MIT"
+    },
     "node_modules/resolve": {
       "version": "1.22.8",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.22.8.tgz",
···
         "node": ">=8"
       }
     },
+    "node_modules/shiki": {
+      "version": "3.4.2",
+      "resolved": "https://registry.npmjs.org/shiki/-/shiki-3.4.2.tgz",
+      "integrity": "sha512-wuxzZzQG8kvZndD7nustrNFIKYJ1jJoWIPaBpVe2+KHSvtzMi4SBjOxrigs8qeqce/l3U0cwiC+VAkLKSunHQQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@shikijs/core": "3.4.2",
+        "@shikijs/engine-javascript": "3.4.2",
+        "@shikijs/engine-oniguruma": "3.4.2",
+        "@shikijs/langs": "3.4.2",
+        "@shikijs/themes": "3.4.2",
+        "@shikijs/types": "3.4.2",
+        "@shikijs/vscode-textmate": "^10.0.2",
+        "@types/hast": "^3.0.4"
+      }
+    },
     "node_modules/side-channel": {
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.0.6.tgz",
···
       },
       "engines": {
         "node": ">= 8"
+      }
+    },
+    "node_modules/space-separated-tokens": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/space-separated-tokens/-/space-separated-tokens-2.0.2.tgz",
+      "integrity": "sha512-PEGlAwrG8yXGXRjW32fGbg66JAlOAwbObuqVoJpv/mRgoWDQfgH1wDPvtzWyUSNAXBGSk8h755YDbbcEy3SH2Q==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
       }
     },
     "node_modules/split2": {
···
         "node": ">=8"
       }
     },
+    "node_modules/stringify-entities": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/stringify-entities/-/stringify-entities-4.0.4.tgz",
+      "integrity": "sha512-IwfBptatlO+QCJUo19AqvrPNqlVMpW9YEL2LIVY+Rpv2qsjCGxaDLNRgeGsQWJhfItebuJhsGSLjaBbNSQ+ieg==",
+      "license": "MIT",
+      "dependencies": {
+        "character-entities-html4": "^2.0.0",
+        "character-entities-legacy": "^3.0.0"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
+      }
+    },
     "node_modules/strip-ansi": {
       "version": "7.1.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.1.0.tgz",
···
       "license": "MIT",
       "bin": {
         "tree-kill": "cli.js"
+      }
+    },
+    "node_modules/trim-lines": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/trim-lines/-/trim-lines-3.0.1.tgz",
+      "integrity": "sha512-kRj8B+YHZCc9kQYdWfJB2/oUl9rA99qbowYYBtr4ui4mZyAQ2JpvVBd/6U2YloATfqBhBTSMhTpgBHtU0Mf3Rg==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
       }
     },
     "node_modules/ts-interface-checker": {
···
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/unist-util-is": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/unist-util-is/-/unist-util-is-6.0.0.tgz",
+      "integrity": "sha512-2qCTHimwdxLfz+YzdGfkqNlH0tLi9xjTnHddPmJwtIG9MGsdbutfTc4P+haPD7l7Cjxf/WZj+we5qfVPvvxfYw==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/unist-util-position": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/unist-util-position/-/unist-util-position-5.0.0.tgz",
+      "integrity": "sha512-fucsC7HjXvkB5R3kTCO7kUjRdrS0BJt3M/FPxmHMBOm8JQi2BsHAHFsy27E0EolP8rp0NzXsJ+jNPyDWvOJZPA==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/unist-util-stringify-position": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/unist-util-stringify-position/-/unist-util-stringify-position-4.0.0.tgz",
+      "integrity": "sha512-0ASV06AAoKCDkS2+xw5RXJywruurpbC4JZSm7nr7MOt1ojAzvyyaO+UxZf18j8FCF6kmzCZKcAgN/yu2gm2XgQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/unist-util-visit": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/unist-util-visit/-/unist-util-visit-5.0.0.tgz",
+      "integrity": "sha512-MR04uvD+07cwl/yhVuVWAtw+3GOR/knlL55Nd/wAdblk27GCVt3lqpTivy/tkJcZoNPzTwS1Y+KMojlLDhoTzg==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0",
+        "unist-util-is": "^6.0.0",
+        "unist-util-visit-parents": "^6.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/unist-util-visit-parents": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/unist-util-visit-parents/-/unist-util-visit-parents-6.0.1.tgz",
+      "integrity": "sha512-L/PqWzfTP9lzzEa6CKs0k2nARxTdZduw3zyh8d2NVBnsyvHjSX4TWse388YrrQKbvI8w20fGjGlhgT96WwKykw==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0",
+        "unist-util-is": "^6.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
     "node_modules/unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
···
       "license": "MIT",
       "engines": {
         "node": ">= 0.8"
+      }
+    },
+    "node_modules/vfile": {
+      "version": "6.0.3",
+      "resolved": "https://registry.npmjs.org/vfile/-/vfile-6.0.3.tgz",
+      "integrity": "sha512-KzIbH/9tXat2u30jf+smMwFCsno4wHVdNmzFyL+T/L3UGqqk6JKfVqOFOZEpZSHADH1k40ab6NUIXZq422ov3Q==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0",
+        "vfile-message": "^4.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/vfile-message": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/vfile-message/-/vfile-message-4.0.2.tgz",
+      "integrity": "sha512-jRDZ1IMLttGj41KcZvlrYAaI3CfqpLpfpf+Mfig13viT6NKvRzWZ+lXz0Y5D60w6uJIBAOGq9mSHf0gktF0duw==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0",
+        "unist-util-stringify-position": "^4.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
       }
     },
     "node_modules/void-elements": {
···
       "license": "MIT",
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
+      }
+    },
+    "node_modules/zwitch": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/zwitch/-/zwitch-2.0.4.tgz",
+      "integrity": "sha512-bXE4cR/kVZhKZX/RjPEflHaKVhUVl85noU3v6b8apfQEc1x4A+zBxjZ4lN8LqGd6WZ3dl98pY4o717VFmoPp+A==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
       }
     }
   }

package.json

···
     "multiformats": "^9.9.0",
     "pino": "^9.3.2",
     "pug": "^3.0.3",
+    "shiki": "^3.4.2",
     "uhtml": "^4.5.9"
   },
   "devDependencies": {

src/lib/highlight.ts

···
+import { createHighlighter, HighlighterGeneric, BundledLanguage, BundledTheme } from 'shiki'
+import type { Element } from 'hast'
+
+let highlighter: HighlighterGeneric<BundledLanguage, BundledTheme> | null = null
+
+export async function getHighlighterInstance() {
+  if (!highlighter) {
+    highlighter = await createHighlighter({
+      themes: ['catppuccin-latte', 'catppuccin-mocha'],
+      langs: [
+        'javascript', 'typescript', 'python', 'java', 'rust', 
+        'go', 'c', 'cpp', 'csharp', 'php', 'ruby', 'cobol',
+        'plaintext', 'txt', 'bash', 'nix'
+      ]
+    })
+  }
+  return highlighter
+}
+
+export async function highlightCode(code: string, lang: string) {
+  const highlighter = await getHighlighterInstance()
+  
+  try {
+    return highlighter.codeToHtml(code, {
+      lang: lang,
+      themes: {
+        light: 'catppuccin-latte',
+        dark: 'catppuccin-mocha'
+      },
+      transformers: [
+        {
+          line(node: Element, line: number) {
+            node.properties['code-line'] = line
+          }
+        }
+      ]
+    })
+  } catch (error) {
+    console.warn(`Language "${lang}" not supported by Shiki, falling back to plaintext`)
+    return highlighter.codeToHtml(code, {
+      lang: 'txt',
+      themes: {
+        light: 'catppuccin-latte',
+        dark: 'catppuccin-mocha'
+      }
+    })
+  }
+} 

src/public/styles.css

···
 .footer a:hover {
   text-decoration: underline;
 }
+
+.highlighted-code {
+  margin: 1rem 0;
+  counter-reset: step;
+  counter-increment: step calc(var(--start, 1) - 1);
+}
+
+.highlighted-code pre {
+  padding: 1rem;
+  overflow-x: auto;
+  border-radius: 4px;
+}
+
+code .line::before {
+  content: counter(step);
+  counter-increment: step;
+  width: 1rem;
+  margin-right: 1.5rem;
+  display: inline-block;
+  text-align: right;
+  color: rgba(115,138,148,.4)
+}
+
+@media (prefers-color-scheme: dark) {
+  .shiki,
+  .shiki span {
+    color: var(--shiki-dark) !important;
+    background-color: var(--shiki-dark-bg) !important;
+    font-style: var(--shiki-dark-font-style) !important;
+    font-weight: var(--shiki-dark-font-weight) !important;
+    text-decoration: var(--shiki-dark-text-decoration) !important;
+  }
+}

src/routes.ts

···
 
 import * as Paste from "#/lexicons/types/li/plonk/paste";
 import * as Comment from "#/lexicons/types/li/plonk/comment";
+import { highlightCode } from "#/lib/highlight";
 
 type Session = {
 	did: string;
···
 			),
 		);
 
+		const highlightedCode = await highlightCode(pasteCode, pasteLang);
+
 		const paste = {
 			uri: pasteUri,
 			code: pasteCode,
+			highlightedCode,
 			title: pasteTitle,
 			lang: pasteLang,
 			shortUrl,

src/views/index.pug

···
 - 
   var langs = ["plaintext"]
       .concat([
+        "bash",
         "javascript",
         "typescript",
         "java",
···
         "c#",
         "c++",
         "cobol",
+        "nix",
       ].toSorted())
 doctype html
 html

src/views/paste.pug

···
         | #{timeDifference(now, Date.parse(paste.createdAt))} ago ·
         | #{paste.lang} · 
         | #{paste.code.split('\n').length} loc · 
-        a(href=`/r/${paste.shortUrl}`) raw
-        |  ·
-        | #{comments.length} #{pluralize(comments.length, 'comment')}
-      pre
-        code
-          - var lines = paste.code.split(/\r?\n|\r|\n/g)
-          - var tot_chars = lines.length.toString().length
-          each line, idx in lines
-            span.code-line
-              span.code-line-num(id=`L${idx + 1}` style=`min-width: ${tot_chars}ch;`)
-                | #{idx + 1}
-              span.code-line-content #{line}
+        a(href=`/r/${paste.shortUrl}`) raw     
+      div.highlighted-code !{paste.highlightedCode}
       hr
 
       if comments.length != 0
···
           a(href="/login") login
           | to post a comment
 
-      +footer()
+      +footer()