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#!/bin/bashset -euo pipefailshopt -s nullglob# SJP 2026-06-10# Build a rolling morph timelapse of BOM synoptic charts (default 3-day window).# Cache structure: /mnt/enclave/synoptic/pairs/<chartA>__<chartB>/p_NNNN.png# On each call: identify rolling window, fill any missing pairs, evict# out-of-window pairs, stitch with linger/dwell, encode mp4.# Triggered via OnSuccess= on synoptic.service.ARCHIVE_DIR="${ARCHIVE_DIR:-/var/lib/synoptic/archive}"WORK_ROOT="${WORK_ROOT:-/mnt/enclave/synoptic}"PAIRS_DIR="$WORK_ROOT/pairs"OUT_DIR="$WORK_ROOT/out"PUBLISH_PATH="${PUBLISH_PATH:-/srv/www/pestrel/morph.mp4}"WINDOW_DAYS="${WINDOW_DAYS:-3}"WINDOW_CHARTS=$((WINDOW_DAYS * 4))MORPH_N="${MORPH_N:-23}"FPS="${FPS:-12}"LINGER="${LINGER:-8}"DWELL="${DWELL:-36}"FADE_IN="${FADE_IN:-1}"FADE_OUT="${FADE_OUT:-2}"require_cmd() { command -v "$1" >/dev/null 2>&1 || { echo "Required: $1" >&2; exit 127; }}require_cmd magickrequire_cmd ffmpegrequire_cmd flockmkdir -p "$PAIRS_DIR" "$OUT_DIR"exec 9>"$WORK_ROOT/.lock"flock -n 9 || { echo "Morph already in progress; skipping."; exit 0; }# --- 1. Rolling window --------------------------------------------------mapfile -t window < <(ls -1 "$ARCHIVE_DIR"/[0-9]*.png 2>/dev/null | tail -n "$WINDOW_CHARTS")if [ "${#window[@]}" -lt 2 ]; then echo "Need at least 2 charts in window (have ${#window[@]})." >&2 exit 1fifirst=$(basename "${window[0]}" .png)last=$(basename "${window[-1]}" .png)echo "Window: ${#window[@]} charts ($first → $last)"# --- 2. Identify needed pair slugs --------------------------------------needed=()for i in $(seq 0 $((${#window[@]} - 2))); do a=$(basename "${window[$i]}" .png) b=$(basename "${window[$((i+1))]}" .png) needed+=("${a}__${b}")done# --- 3. Fill any missing pairs ------------------------------------------SLOT=$((MORPH_N + 1))new_pairs=0for slug in "${needed[@]}"; do dir="$PAIRS_DIR/$slug" sentinel="$dir/p_$(printf '%04d' $SLOT).png" if [ ! -f "$sentinel" ]; then a="${slug%__*}"; b="${slug##*__}" echo " computing pair $a → $b" mkdir -p "$dir" magick "$ARCHIVE_DIR/${a}.png" "$ARCHIVE_DIR/${b}.png" \ -morph "$MORPH_N" "$dir/p_%04d.png" new_pairs=$((new_pairs + 1)) fidoneecho "Computed $new_pairs new pair(s)"# --- 4. Evict pairs outside the window ----------------------------------declare -A needed_setfor slug in "${needed[@]}"; do needed_set[$slug]=1; doneevicted=0for dir in "$PAIRS_DIR"/*/; do slug=$(basename "$dir") if [ -z "${needed_set[$slug]:-}" ]; then rm -rf "$dir" evicted=$((evicted + 1)) fidoneecho "Evicted $evicted out-of-window pair(s)"# --- 5. Assemble sequence with linger/dwell -----------------------------SEQ_DIR=$(mktemp -d "$WORK_ROOT/seq.XXXXXX")trap 'rm -rf "$SEQ_DIR"' EXITlast_pair_idx=$(( ${#needed[@]} - 1 ))out=0# Per pair: take frames 0..MORPH_N (24 frames), dropping the joint with next.# For the very last pair only, also take frame SLOT (the final chartB).# Insert LINGER after every j==0 (each source chart appears once, as next# pair's j==0). Insert DWELL after the final j==SLOT (the latest chart).for i in "${!needed[@]}"; do dir="$PAIRS_DIR/${needed[$i]}" last_frame=$MORPH_N if [ "$i" -eq "$last_pair_idx" ]; then last_frame=$SLOT; fi for j in $(seq 0 $last_frame); do src="$dir/p_$(printf '%04d' $j).png" if [ ! -f "$src" ]; then echo "Missing pair frame: $src" >&2 exit 2 fi ln -sf "$src" "$SEQ_DIR/seq_$(printf '%06d' $out).png" out=$((out + 1)) if [ "$j" -eq 0 ]; then for k in $(seq 1 $LINGER); do ln -sf "$src" "$SEQ_DIR/seq_$(printf '%06d' $out).png" out=$((out + 1)) done elif [ "$i" -eq "$last_pair_idx" ] && [ "$j" -eq "$SLOT" ]; then for k in $(seq 1 $DWELL); do ln -sf "$src" "$SEQ_DIR/seq_$(printf '%06d' $out).png" out=$((out + 1)) done fi donedonedur=$(awk "BEGIN{printf \"%.2f\", $out/$FPS}")fout=$(awk "BEGIN{printf \"%.3f\", $out/$FPS - $FADE_OUT}")echo "Sequence: $out frames = ${dur}s at ${FPS} fps; fade-out ${FADE_OUT}s from ${fout}s"# --- 6. Encode ----------------------------------------------------------TMP_MP4=$(mktemp "$OUT_DIR/morph.XXXXXX.mp4")ffmpeg -y -hide_banner -loglevel error -framerate "$FPS" \ -i "$SEQ_DIR/seq_%06d.png" \ -vf "fade=t=in:st=0:d=$FADE_IN,fade=t=out:st=$fout:d=$FADE_OUT" \ -c:v libx264 -pix_fmt yuv420p -movflags +faststart "$TMP_MP4"mkdir -p "$(dirname "$PUBLISH_PATH")"install -m 644 "$TMP_MP4" "$PUBLISH_PATH"rm -f "$TMP_MP4"echo "Published $PUBLISH_PATH ($(stat -c %s "$PUBLISH_PATH") bytes)"
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