My watchloop script, and helper functions

clear the scrollback on MacOS

alias csb="clear && printf '\e[3J'"

horizontal rule

# Print a horizontal rule, the width of the terminal
# http://wiki.bash-hackers.org/snipplets/print_horizontal_line
function hr {
    # Optional arg $1: number of blank lines before
    # Optional arg $2: number of blank lines after

    if [[ $1 > 0 ]]
    then
	printf '%*s\n' $(($1+0)) '' | tr ' ' '\n'
    fi
    printf '%*s\n' "${COLUMNS:-$(tput cols)}" '' | tr ' ' -
    if [[ $2 > 0 ]]
    then
	printf '%*s\n' $(($2+0)) '' | tr ' ' '\n'
    fi
}

watchloop

# perform an action in a loop
function watchloop {
    local clear=0
    if [[ "$1" = "-c" ]]
    then
	clear=1
	shift
    fi
    local dir=$1
    shift
    while true
    do
	hr
	[[ $clear == 1  ]] && clear && printf '\e[3J'
	$* && echo ok
	fswatch -1 -r $dir > /dev/null
	sleep 0.2
    done
}