stab in the dark at getEntryInfo()

src/index.ts

@@ -1,6 +1,7 @@
 import type {AstroIntegration, ContentEntryType, HookParameters} from "astro"
 import {fileURLToPath} from "url"
 import gemtextVitePlugin from "./vitePlugin.js"
+import { parse as parseYaml } from "yaml";
 
 export const ext = "gmi"
 
@@ -41,8 +42,24 @@ export default function gemtext(config: GemtextConfig = {}): AstroIntegration {
                 params.addPageExtension(ext)
                 params.addContentEntryType({
                     extensions: [`.${ext}`],
-                    getEntryInfo: async (params) => {
-                        throw new Error("Not implemented")
+                    getEntryInfo: async ({ fileUrl, contents }) => {
+                      const lines = contents.split('\n');
+                      let data: Record<string, unknown> = {};
+                      let frontmatter = '';
+
+                      if (lines.at(0) === '---' && lines.lastIndexOf('---')) {
+                        frontmatter = lines.slice(1, lines.indexOf('---', 1)).join('\n');
+                        try {
+                          data = { ...data, ...parseYaml(frontmatter) };
+                        } catch { }
+                      }
+
+                      return {
+                        data,
+                        rawData: frontmatter,
+                        body: contents,
+                        slug: typeof data['slug'] === 'string' ? data['slug'] : fileUrl.pathname,
+                      };
                     },
                 })
                 params.updateConfig({