gistfile1.txt

# I haven't battle-tested this but it seems to work OK.

#!/usr/bin/env zsh

# If an alert-triggering string appears in the running output of a command,
# show an alert in the tmux window title.
#
# Useful for getting immediate feedback that a command like rollup -w (i.e.
# rollup watch) has noticed an error in your js

# Initialize variables
command=""
alert_string="(!)"
clear_string="Build succeeded"
alert_icon="🚨"

# Function to show help message
print_help() {
    echo "Usage: ${0} -c <command> [-a <alert_string>] [-r <clear_string>] [-i <alert_icon>]"
    echo
    echo "   -c     Specify the command to execute."
    echo "   -a     Define the string whose presence triggers the alert (default is '(!)')."
    echo "   -r     Define the string whose presence clears the alert (default is 'Build succeeded')."
    echo "   -i     Set the icon to use for alert (default is '🫤')."
    echo "   -h     Show this help message."
}

# Parse command line options
while getopts ":c:a:r:i:h" opt; do
  case ${opt} in
    c)
      command="${OPTARG}"
      ;;
    a)
      alert_string="${OPTARG}"
      ;;
    r)
      clear_string="${OPTARG}"
      ;;
    i)
      alert_icon="${OPTARG}"
      ;;
    h)
      print_help
      exit 0
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      print_help
      exit 1
      ;;
    :)
      echo "Option -$OPTARG requires an argument." >&2
      exit 1
      ;;
  esac
done

if [[ -z "$command" ]]; then
    echo "The -c <command> flag is required."
    exit 1
fi

get_title() {
    tmux display-message -p '#W'
}

# The id of the current tmux window, where the command is executed from
CURRENT_TMUX_WINDOW=`tmux display-message -p -t "${TMUX_PANE}" '#{window_index}'`

ORIGINAL_TITLE=`get_title`

rename() {
    tmux rename-window -t $CURRENT_TMUX_WINDOW "$1"
}

# Run command and capture the output
eval $command 2>&1 | while read -r line; do
    echo "$line"
    if echo "$line" | grep -iq "$alert_string"; then
        rename "$ORIGINAL_TITLE 🫤"
    fi
    if echo "$line" | grep -iq $clear_string; then
        rename $ORIGINAL_TITLE
    fi
done