sfx.sh

# The following bash snippet plays SFX when a matching pattern is found
# in the stdout (or stderr) when running another command

# I personally use it for input-leap / barrier
# To indicate when my cursor is locked or unlocked to the current screen
# or when it reconnects.


# Pairs of pattern and path to sfx file
declare -A SOUNDS=(
  ["has connected"]="ring.mp3"
  ["cursor locked"]="switch-on.aiff"
  ["cursor unlocked"]="switch-off.aiff"
)


# The notifier function
sfx() {
  while IFS= read -r LINE; do
    # tee it
    echo "$LINE"
 
    # look for patterns
    for pat in "${!SOUNDS[@]}"; do
      if [[ $LINE =~ $pat ]]; then
        # play in background
        local SOUND_FILE="${SOUNDS[$pat]}"
        afplay "$SOUND_FILE" &
      fi
    done
  done
}


# Usage examples
input-leaps -f | sfx
tail -f /var/log/syslog.log | sfx