factor out renderGemtextToHtml()

website/src/pages/blog/[...slug].astro

@@ -1,7 +1,7 @@
 ---
 import { type CollectionEntry, getCollection, render } from 'astro:content';
 import BlogPost from '../../layouts/BlogPost.astro';
-import  * as Gemtext from 'gemtext';
+import { renderGemtextToHtml } from '../../renderGemtextToHtml';
 
 export async function getStaticPaths() {
 	const posts = await getCollection('blog');
@@ -12,57 +12,9 @@ export async function getStaticPaths() {
 }
 type Props = CollectionEntry<'blog'>;
 
-function htmlEscape(str: string) {
-    return str.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
-}
-
-const GemtextHTMLRenderer: Gemtext.Renderer<string> = {
-  preamble: function (): string {
-  return '';
-  },
-  postamble: function (): string {
-  return '';
-  },
-  text: function (content: string): string {
-    content = content.trim();
-    if (content === '') {
-      return '';
-    }
-    return `<p>${htmlEscape(content)}</p>`
-  },
-  link: function (url: string, alt: string): string {
-    const imgExtensions: (string | undefined)[] = ['webp', 'png', 'svg', 'gif', 'jpg', 'jpeg', 'apng']
-    if (imgExtensions.includes(url.split('.').at(-1)?.toLowerCase())) {
-      return `<img src="${url}" alt="${alt}" />`;
-    }
-    return `<p>=> <a href="${url}">${alt}</a></p>`;
-  },
-  preformatted: function (content: string[], alt: string): string {
-    return `<pre alt="${alt}">${htmlEscape(content.join('\n'))}</pre>`
-  },
-  heading: function (level: number, text: string): string {
-    return `<h${level}>${htmlEscape(text)}</h${level}>`;
-  },
-  unorderedList: function (content: string[]): string {
-    return `<ul>${content.map(li=>`<li>${htmlEscape(li)}</li>`).join('')}</ul>`;
-  },
-  quote: function (content: string): string {
-    return `<blockquote>${htmlEscape(content)}</blockquote>`;
-  }
-};
-
-function postProcessGemtextToHtml(html: string): string {
-  html = mergeAdjacentBlockquotes(html);
-  return html;
-}
-
-function mergeAdjacentBlockquotes(html: string): string {
-  return html.replaceAll(/\<\/blockquote\>\<blockquote\>/gm, '<br>');
-}
-
 const post = Astro.props;
 const Content = post.filePath?.endsWith('.gmi')
-  ? postProcessGemtextToHtml(Gemtext.parse((post.body ?? '').replace(`# ${post.data.title}`, '')).generate(GemtextHTMLRenderer))
+  ? renderGemtextToHtml(post.body ?? '', post.data.title)
   : (await render(post)).Content;
 ---
 

website/src/renderGemtextToHtml.ts

@@ -0,0 +1,72 @@
+import * as Gemtext from "gemtext";
+
+export function renderGemtextToHtml(gemtext: string, title: string): string {
+  return postProcessGemtextToHtml(
+    Gemtext.parse(gemtext.replace(`# ${title}`, "")).generate(
+      GemtextHTMLRenderer,
+    ),
+  );
+}
+
+const GemtextHTMLRenderer: Gemtext.Renderer<string> = {
+  preamble: function (): string {
+    return "";
+  },
+
+  postamble: function (): string {
+    return "";
+  },
+
+  text: function (content: string): string {
+    content = content.trim();
+    if (content === "") {
+      return "";
+    }
+    return `<p>${htmlEscape(content)}</p>`;
+  },
+
+  link: function (url: string, alt: string): string {
+    const imgExtensions: (string | undefined)[] = [
+      "webp",
+      "png",
+      "svg",
+      "gif",
+      "jpg",
+      "jpeg",
+      "apng",
+    ];
+    if (imgExtensions.includes(url.split(".").at(-1)?.toLowerCase())) {
+      return `<img src="${url}" alt="${alt}" />`;
+    }
+    return `<p>=> <a href="${url}">${alt}</a></p>`;
+  },
+
+  preformatted: function (content: string[], alt: string): string {
+    return `<pre alt="${alt}">${htmlEscape(content.join("\n"))}</pre>`;
+  },
+
+  heading: function (level: number, text: string): string {
+    return `<h${level}>${htmlEscape(text)}</h${level}>`;
+  },
+
+  unorderedList: function (content: string[]): string {
+    return `<ul>${content.map((li) => `<li>${htmlEscape(li)}</li>`).join("")}</ul>`;
+  },
+
+  quote: function (content: string): string {
+    return `<blockquote>${htmlEscape(content)}</blockquote>`;
+  },
+};
+
+function htmlEscape(str: string) {
+  return str.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
+}
+
+function postProcessGemtextToHtml(html: string): string {
+  html = mergeAdjacentBlockquotes(html);
+  return html;
+}
+
+function mergeAdjacentBlockquotes(html: string): string {
+  return html.replaceAll(/\<\/blockquote\>\<blockquote\>/gm, "<br>");
+}