Home-Video/plexMonitor/plexMonitor.sh

#!/bin/bash

# Config
EXEC_DIR="${HOME}/bin/video/plexMonitor"
TEMP_DIR="`getconf DARWIN_USER_TEMP_DIR`"

# Compare the current state to the last one
compareState() {
	CHANGED=1
	"${EXEC_DIR}/${CMD}" > "${TEMP_FILE}" 2>/dev/null
	if [ -r "${MODE}" ]; then
		diff "${TEMP_FILE}" "${MODE}" > /dev/null
		if [ $? -eq 0 ]; then
			CHANGED=0
		fi
	fi

	# If anything changed, note the update time and store the current state for future reference
	if [ $CHANGED -gt 0 ]; then
		date '+%s' > "${MODE}.lastUpdate"
		mv "${TEMP_FILE}" "${MODE}"
	fi
}

# Sanity check
if [ ! -d "${EXEC_DIR}" ] || [ ! -d "${TEMP_DIR}" ]; then
	echo "Bad config" 1>&2
	exit 1
fi

# Allow use in daemon mode
LOOP_DELAY=0
if [ -n "${1}" ] && [ "${1}" -gt 0 ]; then
	LOOP_DELAY=$1
fi

# Determine who we are
MODE="PLAYING"
CMD="plex-playing"
if basename "${0}" | grep -qi GUI; then
	MODE="GUI"
	CMD="plex-gui"
fi

# Construct our runtime paths
DATA_DIR="${TEMP_DIR}/plexMonitor"
TEMP_FILE="`mktemp -t plexMonitor.XXXXXXXX`"

# Get into position
if [ ! -d "${DATA_DIR}" ]; then
	mkdir -p "${DATA_DIR}"
fi
cd "${DATA_DIR}"

# Compare
compareState

# Sleep and repeat (if requested)
while [ $LOOP_DELAY -gt 0 ]; do
	sleep $LOOP_DELAY
	compareState
done

# Cleanup
rm -f "${TEMP_FILE}"
exit 0