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hoelee-blog/scripts/og-gen
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Add 5 posts (EN + ZH): fully on-chain SVG NFTs, the CRLF art trap, a Chainlink VRF v2.5 lottery, page-by-page PDF verification, JPA @Version
Five posts with custom OG + banner and hire CTAs. Three are web3, giving
that category its first posts — /categories/web3/ previously 404'd while the
index advertised it as '0 posts - coming soon'.

Backdated where the work genuinely is older: the foundry-nft and
hardhat-smartcontract-lottery commits date to 2024-08-15..19, so those two
posts fill the empty 2024-10 and 2024-12 archive months with updatedDate
holding the real date. The two 2026-08-19 posts use their real work date.

TERMINALS/BANNERS entries for all five slugs are committed this time (both
generators were clean; diffs verified purely additive).
2026-09-29 02:41:58 +08:00
..

og-gen — per-post OG image generator

Generates a branded 1200×630 social-share image for a blog post, matching the site's cobalt-blue #295cff branding, the logo-square.png mark, and the "terminal / debugging" visual style.

Usage

node scripts/og-gen/generate.mjs <post-slug>

Reads frontmatter (title, category, tags) from src/content/posts/<slug>.md, fills template.html, renders with headless Chrome, and writes public/og/<slug>.png.

The post's frontmatter needs ogImage: /og/<slug>.png so the blog serves it (layout already renders og:image + width/height; PostList shows it as a card thumbnail).

Customizing the terminal box

Each post shows a "terminal" panel (the red error / green fix lines). Add an entry keyed by slug in TERMINALS inside generate.mjs, using these tokens:

<div class="line"><span class="prompt">$</span><span class="cmd">command</span></div>
<div class="line"><span class="prompt">&nbsp;</span><span class="err">error line</span></div>
<div class="line"><span class="prompt">$</span><span class="cmd">fix</span><span class="fix">→ done ✓</span></div>

No entry → a generic default terminal.

Requirements

  • Google Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe (override with CHROME_PATH env var).
  • Node 20+.

Notes

  • PNG (not JPG) is intentional: for flat UI/terminal art, PNG is smaller and sharper than JPG (see commit history).
  • The logo-square.png referenced lives at public/logo-square.png.