stopwatch

script

// simple drafts stopwatch

class Stopwatch {
    constructor() {
        this.iLap = 0;
        this.tStart = 0;
        this.tLast = 0;
    }

    lap(s) {
        let lines = s.split('\n');
        if ((lines.length == 1) && lines[0].length == 0) {
            lines.pop();
        }

        lines.push(this.timestamp());

        return lines.map(this.processLine, this).join('\n');
    }

    elpasedTime(t) {
        return this.toHMS(t - this.tStart);
    }

    lapTime(t) {
        return this.toHMS(t - this.tLast);
    }

    parseTimestamp(s) {
        let m = s.match(/^\s*(\d{2}):(\d{2}):(\d{2})/);
        return m ? ((+m[1])*60*60 + (+m[2])*60 + (+m[3])) : 0; 
    }

    processLine(l) {
        let t = this.parseTimestamp(l);
        if (t == 0) {
            return l;
        }

        l = l.split(' >> ')[0] + ' >> ';
        if (this.iLap) {
            l += 'Lap ' + this.iLap + ((this.iLap < 10) ? '  ' : ' ');
            l += this.lapTime(t) + ' / ' + this.elpasedTime(t);
        } else {
            l += 'Start';
            this.tStart = t;
        }

        this.iLap++;
        this.tLast = t;
        return l;        
    }

    timestamp() {
        return (new Date()).toString('HH:mm:ss');
    }

    toHMS(t) {
        return Date.today().addSeconds(t).toString('H:mm:ss').replace(/^0:/, '');
    }
}

const text = (new Stopwatch()).lap(editor.getText());
editor.setText(text)