docs: add lyrics dependency setup helper

lyrics/README.md

@@ -15,6 +15,17 @@ highlighting, animated line changes, and configurable online or local sources.
 Install `playerctl`, `python3`, `curl`, and `cp` on `PATH`. The active media
 player must expose MPRIS metadata for automatic track and playback detection.
 
+Noctalia installs the plugin files; it does not install system packages for you.
+To check or install the runtime packages automatically, run:
+
+```sh
+sh scripts/setup-deps.sh --check
+sh scripts/setup-deps.sh
+```
+
+Use `--yes` for unattended installs. The script supports `apt`, `dnf`,
+`pacman`, `zypper`, `apk`, and `xbps-install`.
+
 ## Usage
 
 Enable `h465855hgg/lyrics`, then add the `lyrics` bar widget in Noctalia's bar

lyrics/scripts/setup-deps.sh

@@ -0,0 +1,149 @@
+#!/usr/bin/env sh
+set -eu
+
+usage() {
+  cat <<'EOF'
+Usage: scripts/setup-deps.sh [--check] [--yes]
+
+Install or check runtime dependencies for the Noctalia Lyrics plugin.
+
+Options:
+  --check   Only report missing commands; do not install anything.
+  --yes     Skip the confirmation prompt before installing packages.
+  --help    Show this help text.
+EOF
+}
+
+CHECK_ONLY=0
+ASSUME_YES=0
+
+while [ "$#" -gt 0 ]; do
+  case "$1" in
+    --check)
+      CHECK_ONLY=1
+      ;;
+    -y|--yes)
+      ASSUME_YES=1
+      ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "Unknown option: $1" >&2
+      usage >&2
+      exit 2
+      ;;
+  esac
+  shift
+done
+
+need_command() {
+  command -v "$1" >/dev/null 2>&1 || MISSING_COMMANDS="$MISSING_COMMANDS $1"
+}
+
+MISSING_COMMANDS=""
+need_command playerctl
+need_command python3
+need_command curl
+need_command cp
+
+if [ -z "$MISSING_COMMANDS" ]; then
+  echo "All runtime commands are installed: playerctl python3 curl cp"
+  exit 0
+fi
+
+echo "Missing runtime command(s):$MISSING_COMMANDS"
+
+if [ "$CHECK_ONLY" -eq 1 ]; then
+  exit 1
+fi
+
+if [ "$(id -u)" -eq 0 ]; then
+  SUDO=""
+elif command -v sudo >/dev/null 2>&1; then
+  SUDO="sudo"
+else
+  echo "sudo is required to install packages as a non-root user." >&2
+  exit 1
+fi
+
+detect_pm() {
+  if command -v apt-get >/dev/null 2>&1; then
+    echo apt
+  elif command -v dnf >/dev/null 2>&1; then
+    echo dnf
+  elif command -v pacman >/dev/null 2>&1; then
+    echo pacman
+  elif command -v zypper >/dev/null 2>&1; then
+    echo zypper
+  elif command -v apk >/dev/null 2>&1; then
+    echo apk
+  elif command -v xbps-install >/dev/null 2>&1; then
+    echo xbps
+  else
+    echo unknown
+  fi
+}
+
+PM="$(detect_pm)"
+
+case "$PM" in
+  apt)
+    INSTALL_CMD="$SUDO apt-get update && $SUDO apt-get install -y playerctl python3 curl coreutils"
+    ;;
+  dnf)
+    INSTALL_CMD="$SUDO dnf install -y playerctl python3 curl coreutils"
+    ;;
+  pacman)
+    INSTALL_CMD="$SUDO pacman -S --needed playerctl python curl coreutils"
+    ;;
+  zypper)
+    INSTALL_CMD="$SUDO zypper install -y playerctl python3 curl coreutils"
+    ;;
+  apk)
+    INSTALL_CMD="$SUDO apk add playerctl python3 curl coreutils"
+    ;;
+  xbps)
+    INSTALL_CMD="$SUDO xbps-install -Sy playerctl python3 curl coreutils"
+    ;;
+  *)
+    cat >&2 <<'EOF'
+Could not detect a supported package manager.
+Install these packages manually with your distribution package manager:
+  playerctl python3 curl coreutils
+EOF
+    exit 1
+    ;;
+esac
+
+echo "Detected package manager: $PM"
+echo "Install command: $INSTALL_CMD"
+
+if [ "$ASSUME_YES" -ne 1 ]; then
+  printf "Proceed with installation? [y/N] "
+  read -r answer
+  case "$answer" in
+    y|Y|yes|YES)
+      ;;
+    *)
+      echo "Cancelled."
+      exit 1
+      ;;
+  esac
+fi
+
+sh -c "$INSTALL_CMD"
+
+MISSING_COMMANDS=""
+need_command playerctl
+need_command python3
+need_command curl
+need_command cp
+
+if [ -n "$MISSING_COMMANDS" ]; then
+  echo "Still missing after installation:$MISSING_COMMANDS" >&2
+  exit 1
+fi
+
+echo "Dependencies installed successfully."