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import { EventEmitter } from 'events';
import * as readline from 'readline';
import * as chalk from 'chalk';
/**
* Progress bar
*/
export default class extends EventEmitter {
public max: number;
public value: number;
public text: string;
private indicator: number;
constructor(max: number, text: string = null) {
super();
this.max = max;
this.value = 0;
this.text = text;
this.indicator = 0;
this.draw();
const iclock = setInterval(() => {
this.indicator = (this.indicator + 1) % 4;
this.draw();
}, 200);
this.on('complete', () => {
clearInterval(iclock);
});
}
public increment(): void {
this.value++;
this.draw();
// Check if it is fulfilled
if (this.value === this.max) {
this.indicator = null;
cll();
process.stdout.write(`${this.render()} -> ${chalk.bold('Complete')}\n`);
this.emit('complete');
}
}
public draw(): void {
const str = this.render();
cll();
process.stdout.write(str);
}
private render(): string {
const width = 30;
const t = this.text ? `${this.text} ` : '';
const v = Math.floor((this.value / this.max) * width);
const vs = new Array(v + 1).join('*');
const p = width - v;
const ps = new Array(p + 1).join(' ');
const percentage = Math.floor((this.value / this.max) * 100);
const percentages = chalk.gray(`(${percentage} %)`);
let i: string;
switch (this.indicator) {
case 0: i = '-'; break;
case 1: i = '\\'; break;
case 2: i = '|'; break;
case 3: i = '/'; break;
case null: i = '+'; break;
}
return `${i} ${t}[${vs}${ps}] ${this.value} / ${this.max} ${percentages}`;
}
}
/**
* Clear current line
*/
function cll(): void {
readline.clearLine(process.stdout, 0); // Clear current text
readline.cursorTo(process.stdout, 0, null); // Move cursor to the head of line
}
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