angular-ide/lib/progress-bar.js

Provides a seamless integration with the Angular IDE from the command-line for developers looking for an enhanced development experience with Angular.

const readline = require('readline');

const R = require('ramda');
const chalk = require('chalk');

function ProgressBar(format) {
  this.format = format;
}

ProgressBar.prototype.update = function update(currentValue, maxValue) {
  const barWidth = 20;
  const barFilled = Math.ceil((currentValue / maxValue) *  (barWidth) );
  const barRemaining = barWidth - barFilled;

  const leftSide = chalk.dim('[');
  const rightSide = chalk.dim(']');
  const progress = chalk.green(R.range(0, barFilled).map(R.always('=')).join(''));
  const remaining = chalk.yellow(
    R.range(0, barRemaining).map(R.always('-')).join('')
  );

  const percentCompleted = ((currentValue / maxValue) * 100) 
    .toFixed()
    .toString();

  const bar = leftSide.concat(progress, remaining, rightSide);

  const replaceData = [
    {
      token: ':bar',
      value: bar,
    },
    {
      token: ':completed',
      value: percentCompleted,
    },
  ];

  const progressBarText = R.reduce(
    (currentString, replaceData) => {
      return R.apply(R.curry(R.replace),
        R.concat(
          R.props(['token', 'value'], replaceData),
          [currentString]
        )
      );
    },
    this.format,
    replaceData
  );

  readline.clearLine(process.stdout, -1);
  process.stdout.write(progressBarText);
  readline.moveCursor(process.stdout, -progressBarText.length, 0);
};

ProgressBar.prototype.complete = function complete() {
  process.stdout.write("\n");
};

module.exports = ProgressBar;