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import type { AstroIntegration } from "astro";
import { createOgImage } from "../utils/createOgImage";
import { globby } from "globby";
import fs from "fs/promises";
import matter from "gray-matter";
import path from "path";
const postsDir = path.resolve("./src/content/blog");
const outDir = path.resolve("./public/images/preview");
export default function ogImageGenerator(): AstroIntegration {
return {
name: "og-images",
hooks: {
"astro:build:setup": async ({ logger }) => {
await fs.mkdir(outDir, { recursive: true });
const mdFiles = await globby("*.md", { cwd: postsDir });
logger.info(`${mdFiles.length} posts found`);
const results = await Promise.allSettled(
mdFiles.map(async (file) => {
const slug = file.replace(/\.md$/, "");
const content = await fs.readFile(path.join(postsDir, file), "utf-8");
const { data } = matter(content);
const png = await createOgImage(data.title, data.datePublished);
const outPath = path.join(outDir, `${slug}.png`);
await fs.writeFile(outPath, png);
logger.info(`OG image created: ${slug}`);
})
);
results.forEach((r) => {
if (r.status === "rejected") {
logger.error(`Error for ${r.reason.slug}: ${r.reason.message}`);
}
});
const failures = results.filter((r) => r.status === "rejected");
if (failures.length) {
throw new Error(`Failed to generate OG images for ${failures.length} posts`);
}
},
},
};
}
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