Class MultiBar

lib/multi-bar.js:7–236

// Progress-Bar constructor
module.exports = class MultiBar extends _EventEmitter{

    constructor(options, preset){
        super();

        // list of bars
        this.bars = [];

        // parse+store options
        this.options = _options.parse(options, preset);

        // disable synchronous updates
        this.options.synchronousUpdate = false;

        // store terminal instance
        this.terminal = (this.options.terminal) ? this.options.terminal : new _Terminal(this.options.stream);

        // the update timer
        this.timer = null;

        // progress bar active ?
        this.isActive = false;

        // update interval
        this.schedulingRate = (this.terminal.isTTY() ? this.options.throttleTime : this.options.notTTYSchedule);

        // logging output buffer
        this.loggingBuffer = [];

        // callback used for gracefulExit
        this.sigintCallback = null;
    }

    // add a new bar to the stack
    create(total, startValue, payload, barOptions={}){
        // create new bar element
        const bar = new _BarElement(Object.assign({}, this.options, barOptions));

        // store bar
        this.bars.push(bar);

        // progress updates are only visible in TTY mode!
        if (this.options.noTTYOutput === false && this.terminal.isTTY() === false){
            return bar;
        }

        // add handler to restore cursor settings (stop the bar) on SIGINT/SIGTERM ?
        if (this.sigintCallback === null && this.options.gracefulExit){
            this.sigintCallback = this.stop.bind(this);
            process.once('SIGINT', this.sigintCallback);
            process.once('SIGTERM', this.sigintCallback);
        }
        
        // multiprogress already active ?
        if (!this.isActive){
            // hide the cursor ?
            if (this.options.hideCursor === true){
                this.terminal.cursor(false);