#!/bin/bash

set -e
set -o pipefail

DIR=~/arc/vid/screencasts
EXT=mkv
#EXT=ogv # Low quality for some reason

main() {
    local response
    printf 'Proceed? (Y/n)\n'
    read -rsn 1 response
    case "$response" in
        '' | y | Y )
            true;;
        *)
            exit 1;;
    esac

    local -r timestamp=$(date +'%Y-%m-%d--%H-%M-%S') || exit 1
    local -r file_name="screen--${timestamp}.$EXT"
    local -r file_path="$DIR"/"$file_name"
    local -r slop=$(slop -f '%x %y %w %h') || exit 1

    mkdir -p "$DIR"
    read -r X Y W H <<< "$slop"
    ffmpeg -f x11grab -s "$W"x"$H" -i :0.0+"$X","$Y" -f pulse -ac 2 -i default "$file_path"
}

main "$@"