hoelee-blog/scripts/banner-gen/README.md

banner-gen — per-post banner/hero image generator

Generates a branded 1600×900 (16:9) banner image for a blog post — shown at the top of the article, above the title. Matches the site's cobalt-blue branding and the "terminal / debugging" visual language (siblings with scripts/og-gen/, which produces the 1200×630 social-share image).

Usage

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

Reads the post's category from frontmatter, fills template.html, renders with headless Chrome, and writes public/banners/<slug>.png.

Then add banner: /banners/<slug>.png to the post frontmatter (en + zh) — [...slug].astro renders it above the H1 title.

Customizing content

Each post's banner content lives in BANNERS in generate.mjs, keyed by slug, with three parts:

• titlebar — the terminal window's title-bar text
• lines — terminal body rows: { t, text } where t ∈ cmd · dim · err (red) · ok (green) · hl (amber) · prompt ($)
• flow — bottom pipeline steps: { n: '1', label: '...', err?: true }

No entry → a generic default banner.

Requirements

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

Relationship to og-gen

• og-gen → public/og/<slug>.png (1200×630, 2:1) for social sharing.
• banner-gen → public/banners/<slug>.png (1600×900, 16:9) for the article hero. The banner is a "filled" visual (terminal + flow pipeline), not a poster — avoid large empty margins.