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110 lines
3.9 KiB
110 lines
3.9 KiB
#!/usr/bin/env bash |
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# Regenerate default Open Graph JPEG (1200×630): dark editorial panel + left painting. |
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# Writes assets/theme/default/og-image.jpg (committed default) and assets/theme/local/og-image.jpg (local override). |
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# Requires: ImageMagick (convert), fold. From repository root: |
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# ./scripts/build-og-image.sh |
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set -euo pipefail |
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ROOT="$(cd "$(dirname "$0")/.." && pwd)" |
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cd "$ROOT" |
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YAML="${ROOT}/config/unfold.yaml" |
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LOGO="${ROOT}/assets/laeserin_logo.png" |
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DEFAULT_MARK="${ROOT}/assets/theme/default/icons/favicon-96x96.png" |
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OUT_DEFAULT="${ROOT}/assets/theme/default/og-image.jpg" |
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OUT_LOCAL="${ROOT}/assets/theme/local/og-image.jpg" |
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FONT_TITLE="/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf" |
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FONT_SUB="/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf" |
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FONT_BODY="/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf" |
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W=1200 |
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H=630 |
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PAD=48 |
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LW=$((W * 45 / 100)) |
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TEXT_X=618 |
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TITLE_Y=108 |
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if [[ ! -f "$LOGO" ]]; then |
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echo "Missing logo: $LOGO" >&2 |
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exit 1 |
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fi |
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yaml_scalar() { |
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local key="$1" |
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grep -E "^[[:space:]]*${key}:" "$YAML" | head -1 | sed -E "s/^[[:space:]]*${key}:[[:space:]]*['\"](.*)['\"].*/\1/" |
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} |
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NAME="$(yaml_scalar name)" |
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DESC="$(yaml_scalar description)" |
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HEADLINE="$(yaml_scalar og_headline)" |
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SUBHEAD="$(yaml_scalar og_subheading)" |
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[[ -z "$HEADLINE" ]] && HEADLINE="$NAME" |
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[[ -z "$SUBHEAD" ]] && SUBHEAD="$NAME" |
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if [[ -z "$NAME" || -z "$DESC" ]]; then |
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echo "Could not read name/description from $YAML" >&2 |
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exit 1 |
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fi |
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mkdir -p "$(dirname "$OUT_DEFAULT")" "$(dirname "$OUT_LOCAL")" |
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TMP="$(mktemp -d)" |
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trap 'rm -rf "$TMP"' EXIT |
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mapfile -t _OG_LINES < <(fold -s -w 44 <<<"$DESC") |
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DESC_MULTILINE=$(printf '%s\n' "${_OG_LINES[@]}") |
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mapfile -t _HL_LINES < <(fold -s -w 22 <<<"$HEADLINE") |
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HEAD_MULTILINE=$(printf '%s\n' "${_HL_LINES[@]}") |
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# Dark editorial right panel (warm charcoal, not pure black). |
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CANVAS='#1c1a18' |
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convert -size "${W}x${H}" xc:"$CANVAS" "$TMP/canvas.png" |
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# Left: painting — darker, slightly desaturated so it reads as “lamplight” beside the panel. |
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convert "$LOGO" -fuzz 8% -trim +repage \ |
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-resize "${LW}x${H}^" -gravity center -extent "${LW}x${H}" \ |
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-gamma 1.05 -modulate 78,92,98 -unsharp 0x0.5+0.45+0.012 \ |
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"$TMP/left.png" |
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convert "$TMP/canvas.png" "$TMP/left.png" -geometry +0+0 -compose over -composite "$TMP/base.png" |
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# Seam: transparent at left → soft lift into panel (#262320). |
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convert -size "${W}x${H}" 'gradient:rgba(28,26,24,0)-rgba(38,35,32,0.55)' "$TMP/seam_raw.png" |
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convert "$TMP/seam_raw.png" -rotate 90 -blur 0x38 -rotate -90 "$TMP/seam_blur.png" |
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convert "$TMP/base.png" "$TMP/seam_blur.png" -compose over -composite "$TMP/blended.png" |
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HL_COUNT=${#_HL_LINES[@]} |
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LINE_H=58 |
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SUB_Y=$((TITLE_Y + HL_COUNT * LINE_H + 20)) |
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BODY_Y=$((SUB_Y + 42)) |
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# Type: warm off-white headline, sage sub, muted body (matches theme-dark.css tokens). |
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convert "$TMP/blended.png" \ |
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-font "$FONT_TITLE" -pointsize 52 -fill '#e8e1d9' -annotate +${TEXT_X}+${TITLE_Y} "$HEAD_MULTILINE" \ |
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-font "$FONT_SUB" -pointsize 27 -fill '#8faf8f' -annotate +${TEXT_X}+${SUB_Y} "$SUBHEAD" \ |
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-font "$FONT_BODY" -pointsize 23 -fill '#b7ada3' -interline-spacing 6 \ |
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-annotate +${TEXT_X}+${BODY_Y} "$DESC_MULTILINE" \ |
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PNG24:"$TMP/with_type.png" |
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if [[ -f "$DEFAULT_MARK" ]]; then |
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convert "$DEFAULT_MARK" -resize 88x88 \ |
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\( -size 88x88 xc:none -fill white -draw "circle 44,44 44,0" \) \ |
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-compose DstIn -composite -alpha set \ |
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-modulate 110,90,98 \ |
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-channel A -evaluate multiply 0.42 +channel \ |
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"$TMP/mark.png" |
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convert "$TMP/with_type.png" \( "$TMP/mark.png" \) -gravity SouthEast -geometry +${PAD}+${PAD} -compose over -composite "$TMP/marked.png" |
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else |
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cp "$TMP/with_type.png" "$TMP/marked.png" |
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fi |
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# Slight depth; keep warmth (not neon). |
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convert "$TMP/marked.png" -modulate 98,105,100 -unsharp 0x0.5+0.42+0.01 \ |
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-quality 86 -sampling-factor 4:2:0 -strip "$OUT_DEFAULT" |
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cp "$OUT_DEFAULT" "$OUT_LOCAL" |
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rm -f "${ROOT}/assets/theme/local/og-image.png" |
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echo "Wrote $OUT_DEFAULT and $OUT_LOCAL ($(wc -c <"$OUT_DEFAULT") bytes each)"
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