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#!/bin/bash
# Apply a wallpaper and generate colors with wallust (16-color palette) + matugen (Material You / M3).
# Usage: apply-colors.sh <image> [light|dark]
# Called by theme-switcher.sh and the waybar random-wallpaper click.
set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "$(realpath "$0")")" && pwd)"
IMG="${1:-}"
MODE="${2:-auto}"
LOG="${THEME_LOG:-/tmp/theme-switcher.log}"
log() {
printf '%s %s\n' "$(date '+%Y-%m-%d %H:%M:%S')" "$*" >>"$LOG"
}
# Record the exact failing command + line on any error.
trap 'log "apply-colors FAILED (exit $?) in ${BASH_SOURCE[0]}:$LINENO: $BASH_COMMAND"' ERR
if [ -z "$IMG" ] || [ ! -f "$IMG" ]; then
echo "usage: $0 <image> [light|dark]" >&2
exit 1
fi
# wait for the awww daemon to be ready (it is spawned next to this script at login)
log "awww img $IMG"
for _ in $(seq 1 10); do
if awww query >/dev/null 2>&1; then
break
fi
sleep 1
done
# set the wallpaper FIRST and unconditionally — this is the critical, must-work
# step. Color generation below is best-effort: a failure there must never block
# the wallpaper from changing (that coupling is what froze the wallpaper before).
awww img "$IMG" || { log "awww img FAILED ($IMG)"; exit 1; }
# blurred copy for the Overview backdrop (sibling or on-the-fly generation)
"$SCRIPT_DIR/set-backdrop.sh" "$IMG" || log "set-backdrop FAILED ($IMG)"
# wallust: classic 16-color palette (foot, btop, ...)
# fastresize (the config default) is flaky on some images — always use resized.
# Best-effort: a wallust failure must not prevent the wallpaper from sticking.
log "wallust palette=$MODE $IMG"
case "$MODE" in
light|dark) WALLUST_PALETTE=("--palette" "$MODE") ;;
*) WALLUST_PALETTE=() ;;
esac
# wallust's `resized` backend is intermittently flaky on some images; retry a
# few times, but ultimately tolerate failure.
ok=0
for attempt in 1 2 3; do
if wallust run -b resized "${WALLUST_PALETTE[@]}" "$IMG"; then
ok=1
break
fi
log "wallust attempt $attempt FAILED ($IMG, mode=$MODE)"
[ "$attempt" -lt 3 ] && sleep 2
done
if [ "$ok" -ne 1 ]; then
log "wallust FAILED after 3 attempts ($IMG, mode=$MODE) — continuing without wallust colors"
else
# foot needs bare RRGGBB, not #RRGGBB — strip the leading '#'
sed -i 's/#\([0-9a-fA-F]\)/\1/g' ~/.cache/wallust/foot-theme.ini 2>/dev/null || true
fi
# matugen: Material You / M3 colors (niri focus ring, ...)
# --prefer is required for non-interactive runs (multiple source colors).
# Best-effort: a matugen failure (e.g. bad config after an upgrade) must not
# block the wallpaper.
log "matugen mode=$MODE $IMG"
case "$MODE" in
light) matugen image "$IMG" -m "light" --prefer saturation ;;
dark) matugen image "$IMG" -m "dark" --prefer saturation ;;
*) matugen image "$IMG" --prefer saturation ;;
esac || log "matugen FAILED ($IMG, mode=$MODE) — continuing without matugen colors"
# reload consumers
killall -SIGUSR2 waybar 2>/dev/null || true
killall -USR1 foot 2>/dev/null || true
niri msg action load-config-file 2>/dev/null || true
makoctl reload 2>/dev/null || true
log "apply-colors OK ($IMG, $MODE)"
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