Hold CAFFEINE for the duration of the app

Long batch scrapes (1000+ ROMs at default thread count) can run for
20+ minutes. On a device with the screen-off timeout shorter than that,
muOS would suspend the device mid-scrape — losing in-flight HTTP
requests and leaving the user with a half-scraped library.

muOS exposes a CAFFEINE function that suppresses sleep while the app
is running. Toggle it on right before the run loop and off after.
Guarded by `command -v` so the launch script stays compatible with
older muOS builds that don't ship CAFFEINE.

Author: milouk

mux_launch.sh

@@ -17,18 +17,18 @@ APP_BIN="app"
 # back to resolving paths relative to this script (works on SD1 or SD2).
 # ---------------------------------------------------------------------------
 if command -v SETUP_APP >/dev/null 2>&1; then
-    SETUP_APP "$APP_BIN" ""
-    APP_DIR="/run/muos/storage/application/Artie"
-    if [ ! -d "$APP_DIR" ]; then
-        # SETUP_APP didn't provide the expected location; fall back.
-        APP_DIR="$(dirname "$(realpath "$0")")"
-    fi
+	SETUP_APP "$APP_BIN" ""
+	APP_DIR="/run/muos/storage/application/Artie"
+	if [ ! -d "$APP_DIR" ]; then
+		# SETUP_APP didn't provide the expected location; fall back.
+		APP_DIR="$(dirname "$(realpath "$0")")"
+	fi
 else
-    # Legacy muOS (pre-Jacaranda). SETUP_SDL_ENVIRONMENT sets up scaler/rotation.
-    if command -v SETUP_SDL_ENVIRONMENT >/dev/null 2>&1; then
-        SETUP_SDL_ENVIRONMENT
-    fi
-    APP_DIR="$(dirname "$(realpath "$0")")"
+	# Legacy muOS (pre-Jacaranda). SETUP_SDL_ENVIRONMENT sets up scaler/rotation.
+	if command -v SETUP_SDL_ENVIRONMENT >/dev/null 2>&1; then
+		SETUP_SDL_ENVIRONMENT
+	fi
+	APP_DIR="$(dirname "$(realpath "$0")")"
 fi
 
 ARTIE_DIR="$APP_DIR/.artie"
@@ -37,7 +37,7 @@ BINDIR="$ARTIE_DIR/bin"
 
 # Kill background music if running (frees the audio device for SDL_mixer)
 if pgrep -f "playbgm.sh" >/dev/null; then
-    killall -q "playbgm.sh" "mpg123"
+	killall -q "playbgm.sh" "mpg123"
 fi
 
 echo app >/tmp/act_go
@@ -57,19 +57,19 @@ export LD_LIBRARY_PATH="$BINDIR/libs.aarch64:$LD_LIBRARY_PATH"
 
 SYSTEM_SDL2="/usr/lib/libSDL2-2.0.so.0"
 if [ -f "$SYSTEM_SDL2" ]; then
-    export LD_PRELOAD="$SYSTEM_SDL2:$LD_PRELOAD"
+	export LD_PRELOAD="$SYSTEM_SDL2:$LD_PRELOAD"
 fi
 
 cd "$ARTIE_DIR" || exit 1
 
 if command -v SET_VAR >/dev/null 2>&1; then
-    SET_VAR "system" "foreground_process" "$APP_BIN"
+	SET_VAR "system" "foreground_process" "$APP_BIN"
 fi
 
 # Device resolution
 if command -v GET_VAR >/dev/null 2>&1; then
-    SCREEN_WIDTH=$(GET_VAR device mux/width 2>/dev/null)
-    SCREEN_HEIGHT=$(GET_VAR device mux/height 2>/dev/null)
+	SCREEN_WIDTH=$(GET_VAR device mux/width 2>/dev/null)
+	SCREEN_HEIGHT=$(GET_VAR device mux/height 2>/dev/null)
 fi
 SCREEN_WIDTH="${SCREEN_WIDTH:-640}"
 SCREEN_HEIGHT="${SCREEN_HEIGHT:-480}"
@@ -81,16 +81,23 @@ log_file="${ARTIE_DIR}/log.txt"
 # Fresh log each launch
 >"$log_file"
 
+# Keep the device awake during long batch scrapes. CAFFEINE is provided
+# by recent muOS builds; the `command -v` guard makes this a no-op on
+# older versions that don't ship it.
+command -v CAFFEINE >/dev/null 2>&1 && CAFFEINE on
+
 # Run Application — pygame/SDL2 handles controller input directly.
 # Exit code 42 = restart after OTA update; anything else = normal exit.
 while true; do
-    $program "${SCREEN_RESOLUTION}" >>"$log_file" 2>&1
-    exit_code=$?
+	$program "${SCREEN_RESOLUTION}" >>"$log_file" 2>&1
+	exit_code=$?
 
-    if [ "$exit_code" -ne 42 ]; then
-        break
-    fi
+	if [ "$exit_code" -ne 42 ]; then
+		break
+	fi
 
-    echo "Restarting after update..." >>"$log_file"
-    sleep 1
+	echo "Restarting after update..." >>"$log_file"
+	sleep 1
 done
+
+command -v CAFFEINE >/dev/null 2>&1 && CAFFEINE off