watch

#!/usr/bin/env bash

source "overload"


output=


output_updated()
{
    clear
    echo "$1" | head -n $(tput lines)

    # Move the (currently hidden) cursor to position 0,0
    printf "\e[0;0H"
}

update_output()
{
    parent "$@"

    _output="`${command[@]}`"
    if [[ "$_output" != "$output" ]]
    then
        output="$_output"
        output_updated "$output"
    fi
}

view_in_less()
{
    parent "$@"

    tput cnorm
    stty echo
    echo "$output" | less
    stty -echo
    tput civis
}

watch()
{
    command=( "$@" )

    if ! $running
    then
        overload update "update_output"
        overload key_pressed l "view_in_less"
        run
    fi
}

if [[ "${BASH_SOURCE[0]}" == "$0" ]]
then
    watch "$@"
fi