close timer bookmarklet

close-timer.js

void(function(){
    function sec2time_str(sec) {
        let h='';
        let m='';
        let s='';
        if (sec > 3600) {
            h = Math.floor(sec / 3600);
            sec -= 3600*h;
            h = `${h} hrs`;
        }
        if (sec > 60) {
            m = Math.floor(sec / 60);
            sec -= 60*m;
            m = `${m} min`;
        }
        if (sec) {
            s = `${sec} sec`;
        }
        return [h, m, s].join(' ').trim();
    }

    function bye() {
        if (window.__close_timer.timer) {
            window.clearInterval(window.__close_timer.timer);
        }
        window.__close_timer.timer = '';
        window.__close_timer.active = false;
        window.__close_timer.sec = 0;
        window.__close_timer.title = '';
    }

    function onInterval() {
        window.__close_timer.sec -= 1;
        if ( window.__close_timer.sec <= 0 ) {
            bye();
            window.close();
            return;
        }
        let time_str = sec2time_str( window.__close_timer.sec );
        document.title = `⏲ [${time_str}] - ${window.__close_timer.title}`;
        debugger;
    };


    // main
    if (typeof window.__close_timer === 'undefined') {
        window.__close_timer = {};
    }

    if (window.__close_timer.active) {
        let time = sec2time_str(window.__close_timer.sec);
        if (window.confirm(`⏲ :${time}\n🚫⏲?`)) {
            document.title = window.__close_timer.title;
            bye();
            return;
        }
        else {
            return;
        }
    }

    // find a <video> get remaining time
    let suggestedTime = '10m';
    let v = document.querySelector('video');
    if (v) {
        let video_time = Math.floor(v.duration - v.currentTime) + 5;
        suggestedTime = sec2time_str(video_time);
    }

    // start new timer 
    let user_time_str = window.prompt('⏲💤 →❌', suggestedTime).trim();
    if (! user_time_str) {
        return;
    }
    const re = /^(([0-9\.]+)\s*(hours|hour|hrs|hr|h))?\s*(([0-9\.]+)\s*(minute|minute|mins|min|m))?\s*(([0-9\.]+)\s*(seconds|second|secs|sec|s))?$/;
    let mat = user_time_str.toLowerCase().match(re);
    let sec = 0;

    if (mat[2]) {
        sec += parseFloat(mat[2]) * 3600;
    }
    if (mat[5]) {
        sec += parseFloat(mat[5]) * 60;
    }
    if (mat[8]) {
        sec += parseInt(mat[8]);
    }
    sec = Math.floor(sec);

    window.__close_timer.title = document.title;
    window.__close_timer.sec = sec;
    window.__close_timer.timer = window.setInterval(onInterval, 1000);
    window.__close_timer.active = true;

})();