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dotfiles/modules/applications/linux-wallpaperengine/home/launcher.sh
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2026-08-04 16:58:40 +09:00

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# shellcheck shell=bash
set -o errexit -o nounset -o pipefail
playlist_file="$1"
default_id="$2"
configuration_id="$3"
assets_dir="$4"
workshop_dir="$5"
scaling="$6"
shift 6
state_file="${XDG_RUNTIME_DIR:?}/linux-wallpaperengine/current"
wallpaper_id="$default_id"
saved_configuration=""
saved_id=""
saved_state=()
outputs=()
if [ -s "$state_file" ]; then
mapfile -t saved_state <"$state_file"
saved_configuration="${saved_state[0]:-}"
saved_id="${saved_state[1]:-}"
if [ "$saved_configuration" = "$configuration_id" ] &&
awk -v id="$saved_id" '$0 == id { found = 1 } END { exit !found }' "$playlist_file"; then
wallpaper_id="$saved_id"
fi
fi
wallpaper_path="$workshop_dir/$wallpaper_id"
if [ ! -d "$wallpaper_path" ]; then
echo "linux-wallpaperengine: missing declared wallpaper: $wallpaper_path" >&2
exit 1
fi
if [ ! -d "$assets_dir" ]; then
echo "linux-wallpaperengine: missing Wallpaper Engine assets: $assets_dir" >&2
exit 1
fi
mapfile -t outputs < <(wlr-randr --json | jq -r '.[] | select(.enabled == true) | .name')
if [ "${#outputs[@]}" -eq 0 ]; then
echo "linux-wallpaperengine: no enabled Wayland outputs were detected" >&2
exit 1
fi
engine_args=("$@" --assets-dir "$assets_dir")
for output in "${outputs[@]}"; do
engine_args+=(
--screen-root "$output"
--bg "$wallpaper_path"
--scaling "$scaling"
)
done
exec linux-wallpaperengine "${engine_args[@]}"