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3 years ago
#!/bin/bash
# Author: Tasos Latsas
# spinner.sh
#
# Display an awesome 'spinner' while running your long shell commands
#
# Do *NOT* call _spinner function directly.
# Use {start,stop}_spinner wrapper functions
# usage:
# 1. source this script in your's
# 2. start the spinner:
# start_spinner [display-message-here]
# 3. run your command
# 4. stop the spinner:
# stop_spinner [your command's exit status]
#
# Also see: test.sh
function _spinner() {
# $1 start/stop
#
# on start: $2 display message
# on stop : $2 process exit status
# $3 spinner function pid (supplied from stop_spinner)
local on_success="DONE"
local on_fail="FAIL"
local white="\e[1;37m"
local green="\e[1;32m"
local red="\e[1;31m"
local nc="\e[0m"
case $1 in
start)
# calculate the column where spinner and status msg will be displayed
let column=$(tput cols)-${#2}-8
# display message and position the cursor in $column column
echo -ne ${2}
printf "%${column}s"
# start spinner
i=1
sp='\|/-'
delay=${SPINNER_DELAY:-0.15}
while :
do
printf "\b${sp:i++%${#sp}:1}"
sleep $delay
done
;;
stop)
if [[ -z ${3} ]]; then
echo "spinner is not running.."
exit 1
fi
kill $3 > /dev/null 2>&1
# inform the user uppon success or failure
echo -en "\b["
if [[ $2 -eq 0 ]]; then
echo -en "${green}${on_success}${nc}"
else
echo -en "${red}${on_fail}${nc}"
fi
echo -e "]"
;;
*)
echo "invalid argument, try {start/stop}"
exit 1
;;
esac
}
function start_spinner {
# $1 : msg to display
_spinner "start" "${1}" &
# set global spinner pid
_sp_pid=$!
disown
}
function stop_spinner {
# $1 : command exit status
_spinner "stop" $1 $_sp_pid
unset _sp_pid
}