Utilities to manipulate the terminal

loading-spinner.sh

#!/usr/bin/env bash
set -e

if [[ "$1" == '-h' ]]; then
	echo 'Shows a small loading indicator.'
	echo "Usage: $(basename $0) [duration=0.15] [frame] [frame...]"
	echo
	echo 'Example:'
	echo "  $(basename $0) &; PID=\$!"
	echo '  # ...'
	echo '  kill $PID'
	exit 0
fi

if [[ -n "$1" ]]; then
	DURATION="$1"
else
	DURATION="0.15"
fi

if [[ -n "$2" ]]; then
	CHARACTERS="${@:2}"
else
	CHARACTERS="| / - \\"
fi

# Hide the cursor, but take care
# to unhide it if we ^C or exit.
trap "tput cnorm" EXIT
tput civis

while true; do
	for C in $CHARACTERS; do
		echo "$C"
		sleep "$DURATION"
		tput cuu1 # Up 1 line
	done
done

Terminal utilities

- loading-spinner
  Shows a text-based loading spinner.