Last modified git-based remark plugin, site URL

src/plugins/remark-last-modified.ts

@@ -0,0 +1,18 @@
+import type { RemarkPlugins } from "astro";
+import { execSync } from "child_process";
+
+export const remarkModifiedTime: RemarkPlugins[number] = () => {
+  return function (_, file) {
+    const filepath = file.history[0];
+    const command = `git log -1 --pretty="format:%cI" "${filepath}"`;
+    let result = execSync(command).toString();
+
+    // File is not in git yet
+    if (result === "") {
+      result = new Date().toISOString();
+    }
+    
+    // @ts-ignore
+    file.data.astro.frontmatter.lastModified = result;
+  };
+};