gulp-choose-files/index.js

Gulp plugin that prompts you to choose the files to pass through the stream.

'use strict';

const through = require('through2');
const { prompt } = require('enquirer');

const fileKey = (file, options) => {
  if (typeof options.key === 'string') return file[options.key];
  if (typeof options.key === 'function') return options.key(file);
  return file.relative;
};

module.exports = options => {
  const opts = Object.assign({ key: 'relative' }, options);
  const message = opts.message || 'Which files do you want to write?';
  const predefined = [].concat(opts.paths || []);
  const choices = [];
  const files = {};

  return through.obj((file, enc, next) => {
    if (opts.skip) {
      next(null, file);
      return;
    }

    let key = fileKey(file, opts);
    if (predefined.length && predefined.includes(key)) {
      next(null, file);
      return;
    }

    if (!predefined.length) {
      choices.push(key);
      files[key] = file;
    }

    next();
  }, function(next) {
    if (!choices.length) {
      next();
      return;
    }

    prompt({ type: 'multiselect', name: 'paths', message, choices, ...options })
      .then(answers => {
        if (answers.paths && answers.paths.length) {
          answers.paths.forEach(filename => this.push(files[filename]));
        }
        next();
      })
      .catch(next);
  });
};