Catch camera event

gistfile1.txt

#!/bin/bash

# Begin looking at the system log via the steam sub-command. Using a --predicate and filtering by the correct
# subsystem first improves CPU performance DRASTICALLY. Then just pull out the camera event 
log stream --predicate 'subsystem == "com.apple.VDCAssistant" && eventMessage CONTAINS[c] "Post event kCameraStream"'| while read line; do
  
  # If we catch a camera start event, turn the light on
  if echo "$line" | grep -q "Post event kCameraStreamStart"; then
    echo "Camera has been activated, turn on the light."
    curl -s -o /dev/null http://192.168.1.198/gpio/1
  fi

  # If we catch a camera stop event, turn the light off.
  if echo "$line" | grep -q "Post event kCameraStreamStop"; then
    echo "Camera shut down, turn off the light."
    curl -s -o /dev/null http://192.168.1.198/gpio/0
  fi
done