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wallpaper engine
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@@ -0,0 +1,167 @@
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# shellcheck shell=bash
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set -o errexit -o nounset -o pipefail
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playlist_file="$1"
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default_id="$2"
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configuration_id="$3"
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shift 3
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state_dir="${XDG_RUNTIME_DIR:?}/linux-wallpaperengine"
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state_file="$state_dir/current"
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usage() {
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printf '%s\n' \
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'Usage: wallpaperengine-wallpaper COMMAND [ID]' \
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'' \
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'Commands:' \
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' select ID Select a declaratively configured ID for this session' \
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' next Select the next configured ID' \
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' previous Select the previous configured ID' \
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' list List configured IDs and mark the selected one' \
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' current Print the selected ID' \
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' restart Restart the selected wallpaper' \
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' stop Stop Wallpaper Engine for this session'
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}
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load_playlist() {
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mapfile -t wallpaper_ids < <(awk '/^[0-9]+$/ && !seen[$0]++' "$playlist_file")
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if [ "${#wallpaper_ids[@]}" -eq 0 ]; then
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echo "wallpaperengine-wallpaper: no wallpaper IDs are configured in settings.nix" >&2
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exit 1
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fi
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}
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contains_id() {
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local candidate="$1"
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local id
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for id in "${wallpaper_ids[@]}"; do
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[ "$id" = "$candidate" ] && return 0
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done
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return 1
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}
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current_id() {
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local saved_configuration=""
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local saved_id=""
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local -a saved_state=()
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if [ -s "$state_file" ]; then
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mapfile -t saved_state <"$state_file"
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saved_configuration="${saved_state[0]:-}"
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saved_id="${saved_state[1]:-}"
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fi
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if [ "$saved_configuration" = "$configuration_id" ] && contains_id "$saved_id"; then
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printf '%s\n' "$saved_id"
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else
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printf '%s\n' "$default_id"
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fi
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}
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select_id() {
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local id="$1"
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if ! contains_id "$id"; then
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echo "wallpaperengine-wallpaper: ID is not declared in settings.nix: $id" >&2
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exit 2
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fi
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mkdir -p "$state_dir"
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printf '%s\n%s\n' "$configuration_id" "$id" >"$state_file"
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systemctl --user restart linux-wallpaperengine.service
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}
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cycle() {
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local step="$1"
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local current
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local index=0
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local next_index
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current=$(current_id)
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for i in "${!wallpaper_ids[@]}"; do
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if [ "${wallpaper_ids[$i]}" = "$current" ]; then
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index="$i"
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break
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fi
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done
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next_index=$(((index + step + ${#wallpaper_ids[@]}) % ${#wallpaper_ids[@]}))
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select_id "${wallpaper_ids[$next_index]}"
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}
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load_playlist
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command="${1:-}"
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if [ -z "$command" ]; then
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usage
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exit 2
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fi
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shift
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case "$command" in
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select)
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[ "$#" -eq 1 ] || {
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usage >&2
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exit 2
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}
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select_id "$1"
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;;
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next)
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[ "$#" -eq 0 ] || {
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usage >&2
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exit 2
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}
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cycle 1
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;;
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previous)
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[ "$#" -eq 0 ] || {
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usage >&2
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exit 2
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}
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cycle -1
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;;
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list)
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[ "$#" -eq 0 ] || {
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usage >&2
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exit 2
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}
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current=$(current_id)
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for id in "${wallpaper_ids[@]}"; do
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if [ "$id" = "$current" ]; then
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printf '* %s\n' "$id"
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else
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printf ' %s\n' "$id"
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fi
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done
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;;
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current)
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[ "$#" -eq 0 ] || {
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usage >&2
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exit 2
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}
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current_id
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;;
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restart)
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[ "$#" -eq 0 ] || {
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usage >&2
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exit 2
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}
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systemctl --user restart linux-wallpaperengine.service
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;;
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stop)
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[ "$#" -eq 0 ] || {
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usage >&2
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exit 2
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}
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systemctl --user stop linux-wallpaperengine.service
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;;
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help | -h | --help)
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usage
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;;
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*)
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usage >&2
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exit 2
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;;
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esac
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@@ -0,0 +1,57 @@
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# shellcheck shell=bash
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set -o errexit -o nounset -o pipefail
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playlist_file="$1"
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default_id="$2"
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configuration_id="$3"
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assets_dir="$4"
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workshop_dir="$5"
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scaling="$6"
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shift 6
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state_file="${XDG_RUNTIME_DIR:?}/linux-wallpaperengine/current"
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wallpaper_id="$default_id"
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saved_configuration=""
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saved_id=""
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saved_state=()
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outputs=()
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if [ -s "$state_file" ]; then
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mapfile -t saved_state <"$state_file"
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saved_configuration="${saved_state[0]:-}"
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saved_id="${saved_state[1]:-}"
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if [ "$saved_configuration" = "$configuration_id" ] &&
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awk -v id="$saved_id" '$0 == id { found = 1 } END { exit !found }' "$playlist_file"; then
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wallpaper_id="$saved_id"
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fi
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fi
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wallpaper_path="$workshop_dir/$wallpaper_id"
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if [ ! -d "$wallpaper_path" ]; then
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echo "linux-wallpaperengine: missing declared wallpaper: $wallpaper_path" >&2
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exit 1
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fi
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if [ ! -d "$assets_dir" ]; then
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echo "linux-wallpaperengine: missing Wallpaper Engine assets: $assets_dir" >&2
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exit 1
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fi
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mapfile -t outputs < <(wlr-randr --json | jq -r '.[] | select(.enabled == true) | .name')
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if [ "${#outputs[@]}" -eq 0 ]; then
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echo "linux-wallpaperengine: no enabled Wayland outputs were detected" >&2
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exit 1
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fi
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engine_args=("$@" --assets-dir "$assets_dir")
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for output in "${outputs[@]}"; do
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engine_args+=(
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--screen-root "$output"
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--bg "$wallpaper_path"
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--scaling "$scaling"
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)
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done
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exec linux-wallpaperengine "${engine_args[@]}"
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@@ -0,0 +1,158 @@
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{
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config,
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lib,
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pkgs,
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...
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}:
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let
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settings = import ../settings.nix;
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inherit (settings)
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assetsDirectory
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fps
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mute
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scaling
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selectedWallpaperId
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switchIntervalSeconds
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wallpaperIds
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workshopDirectory
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;
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resolveHomePath =
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path:
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if lib.hasPrefix "~/" path then
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"${config.home.homeDirectory}/${lib.removePrefix "~/" path}"
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else if lib.hasPrefix "/" path then
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path
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else
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"${config.home.homeDirectory}/${path}";
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hasWallpapers = wallpaperIds != [ ];
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defaultWallpaperId =
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if selectedWallpaperId != null then
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selectedWallpaperId
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else if hasWallpapers then
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lib.head wallpaperIds
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else
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"";
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configurationId = builtins.hashString "sha256" (builtins.toJSON settings);
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resolvedAssetsDirectory = resolveHomePath assetsDirectory;
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resolvedWorkshopDirectory = resolveHomePath workshopDirectory;
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playlist = pkgs.writeText "linux-wallpaperengine-playlist" (
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lib.concatMapStringsSep "\n" (id: id) wallpaperIds + "\n"
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);
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engineArguments = lib.optional mute "--silent" ++ [
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"--fps"
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(toString fps)
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];
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controller = pkgs.writeShellApplication {
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name = "wallpaperengine-wallpaper";
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runtimeInputs = [
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pkgs.coreutils
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pkgs.gawk
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pkgs.systemd
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];
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text = ''
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exec ${lib.getExe pkgs.bash} ${./controller.sh} \
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${lib.escapeShellArg playlist} \
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${lib.escapeShellArg defaultWallpaperId} \
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${lib.escapeShellArg configurationId} \
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"$@"
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'';
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};
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launcher = pkgs.writeShellApplication {
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name = "linux-wallpaperengine-launcher";
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runtimeInputs = [
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pkgs.coreutils
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pkgs.gawk
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pkgs.jq
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pkgs.linux-wallpaperengine
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pkgs.wlr-randr
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];
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text = ''
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exec ${lib.getExe pkgs.bash} ${./launcher.sh} \
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${lib.escapeShellArg playlist} \
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${lib.escapeShellArg defaultWallpaperId} \
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${lib.escapeShellArg configurationId} \
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${lib.escapeShellArg resolvedAssetsDirectory} \
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${lib.escapeShellArg resolvedWorkshopDirectory} \
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${lib.escapeShellArg scaling} \
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${lib.escapeShellArgs engineArguments}
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'';
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};
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in
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assert lib.assertMsg (lib.all (
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id: builtins.isString id && builtins.match "[0-9]+" id != null
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) wallpaperIds) "linux-wallpaperengine: wallpaperIds must contain only numeric strings";
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assert lib.assertMsg (
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lib.unique wallpaperIds == wallpaperIds
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) "linux-wallpaperengine: wallpaperIds must not contain duplicates";
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assert lib.assertMsg (
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selectedWallpaperId == null || builtins.elem selectedWallpaperId wallpaperIds
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) "linux-wallpaperengine: selectedWallpaperId must be null or a member of wallpaperIds";
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assert lib.assertMsg (
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switchIntervalSeconds == null || (builtins.isInt switchIntervalSeconds && switchIntervalSeconds > 0)
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) "linux-wallpaperengine: switchIntervalSeconds must be null or a positive integer";
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assert lib.assertMsg (
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builtins.isInt fps && fps > 0
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) "linux-wallpaperengine: fps must be a positive integer";
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assert lib.assertMsg (
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builtins.isString assetsDirectory && assetsDirectory != ""
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) "linux-wallpaperengine: assetsDirectory must be a non-empty string";
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assert lib.assertMsg (
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builtins.isString workshopDirectory && workshopDirectory != ""
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) "linux-wallpaperengine: workshopDirectory must be a non-empty string";
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assert lib.assertMsg (builtins.elem scaling [
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"default"
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"fill"
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"fit"
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"stretch"
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]) "linux-wallpaperengine: scaling must be default, fill, fit, or stretch";
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{
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home.packages = [
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controller
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pkgs.linux-wallpaperengine
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];
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systemd.user.services = lib.optionalAttrs hasWallpapers {
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linux-wallpaperengine = {
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Unit = {
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Description = "Linux Wallpaper Engine";
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After = [ "graphical-session.target" ];
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PartOf = [ "graphical-session.target" ];
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};
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Service = {
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ExecStart = lib.getExe launcher;
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Restart = "on-abnormal";
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};
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Install.WantedBy = [ "graphical-session.target" ];
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};
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linux-wallpaperengine-switch = {
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Unit.Description = "Switch Linux Wallpaper Engine wallpaper";
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Service = {
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Type = "oneshot";
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ExecStart = "${lib.getExe controller} next";
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};
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};
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};
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systemd.user.timers =
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lib.optionalAttrs
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(hasWallpapers && builtins.length wallpaperIds > 1 && switchIntervalSeconds != null)
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{
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linux-wallpaperengine-switch = {
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Unit = {
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Description = "Periodically switch Linux Wallpaper Engine wallpaper";
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PartOf = [ "graphical-session.target" ];
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};
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Timer = {
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OnActiveSec = "${toString switchIntervalSeconds}s";
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OnUnitActiveSec = "${toString switchIntervalSeconds}s";
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Unit = "linux-wallpaperengine-switch.service";
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};
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Install.WantedBy = [ "graphical-session.target" ];
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};
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};
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}
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