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hoelee-blog/scripts/og-gen
hoelee 08fa7a9412
Deploy / build (push) Successful in 32s
post: four posts — rclone/Drive quota, DSM space reclamation, mail domain/PTR, embedded fonts (EN+ZH) + og/banner
- my-backup-was-using-someone-elses-api-quota        (notes,       2026-10-15, pinned by its own evidence)
- space-reclamation-wasnt-stuck-it-was-waiting       (devops,      2026-10-14, pinned by its own samples)
- adding-a-domain-to-someone-elses-mail-server       (notes,       2025-05-06, backdated: no date/version pins)
- embedding-fonts-so-a-pdf-looks-the-same-everywhere (engineering, 2025-01-22, backdated: no date/version pins)
All four updatedDate 2026-10-16 so every lastmod stays honest; the two backdated posts carry no prose links
(a backdated post may only link backwards). og measured rows=1/overflow=0, banners 8 rows/delta=2/overflow=0.
2026-10-16 13:47:10 +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.