wallpaper engine

modules/applications/linux-wallpaperengine/home/launcher.sh

@@ -0,0 +1,57 @@
+# 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[@]}"