#!/usr/bin/env bash
# html-ppt :: render.sh — headless Chrome screenshot(s)
#
# Usage:
# render.sh # one PNG, slide 1
# render.sh # N PNGs, slides 1..N, via #/k
# render.sh all # autodetect .slide count
# render.sh # custom output dir
#
# Requires: Google Chrome at /Applications/Google Chrome.app (macOS).
set -euo pipefail
CHROME="/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"
if [[ ! -x "$CHROME" ]]; then
echo "error: Chrome not found at $CHROME" >&2
exit 1
fi
FILE="${1:-}"
if [[ -z "$FILE" ]]; then
echo "usage: render.sh [N|all] [out-dir]" >&2
exit 1
fi
if [[ ! -f "$FILE" ]]; then
echo "error: $FILE not found" >&2
exit 1
fi
COUNT="${2:-1}"
OUT="${3:-}"
ABS="$(cd "$(dirname "$FILE")" && pwd)/$(basename "$FILE")"
STEM="$(basename "${FILE%.*}")"
if [[ "$COUNT" == "all" ]]; then
COUNT="$(grep -c 'class="slide"' "$FILE" || true)"
[[ -z "$COUNT" || "$COUNT" -lt 1 ]] && COUNT=1
fi
if [[ -z "$OUT" ]]; then
if [[ "$COUNT" -gt 1 ]]; then
OUT="$(dirname "$FILE")/${STEM}-png"
mkdir -p "$OUT"
fi
fi
render_one() {
local url="$1" target="$2"
"$CHROME" \
--headless=new \
--disable-gpu \
--hide-scrollbars \
--no-sandbox \
--virtual-time-budget=4000 \
--window-size=1920,1080 \
--screenshot="$target" \
"$url" >/dev/null 2>&1
echo " ✔ $target"
}
if [[ "$COUNT" == "1" ]]; then
OUT_FILE="${OUT:-$(dirname "$FILE")/${STEM}.png}"
render_one "file://$ABS" "$OUT_FILE"
else
for i in $(seq 1 "$COUNT"); do
render_one "file://$ABS#/$i" "$OUT/${STEM}_$(printf '%02d' "$i").png"
done
fi
echo "done: rendered $COUNT slide(s) from $FILE"