#!/bin/sh

# thx https://github.com/mrsobakin

VIDEO_DIR="$HOME/Videos/Screencap"
FRAMERATE=60

error() {
    echo "$@"
    exit 1
}

if [ "$1" = "--background" ]; then
    [ -z "$XDG_RUNTIME_DIR" ] && error "XDG_RUNTIME_DIR is not set"

    LOCK_FILE="$XDG_RUNTIME_DIR/screencap.pid"
    if [ -f "$LOCK_FILE" ]; then
        echo "Stopping recording..."
        kill "$(cat "$LOCK_FILE")"
        rm -f "$LOCK_FILE"
        exit 0
    fi
fi


slop -f "%wx%h :0.0+%x,%y" | {
    read -r size pos
    [ "$size" = "" ] && error "Interrupted area selection"

    echo "Starting recording..."

    record() {
        exec ffmpeg                        \
            -video_size "$size"            \
            -framerate "$FRAMERATE"        \
            -thread_queue_size 4096        \
            -f x11grab -i "$pos" -c:v h264 \
            -f pulse -ac 2 -i default      \
            "$VIDEO_DIR/$(date +%s%N).mp4"
    }

    if [ "$1" != "--background" ]; then
        record
    else
        record &
        pid=$!
        echo "$pid" > "$LOCK_FILE"
    fi
}