emarschner/iconify

var path = require('path'),
    stream = require('stream');

var iconify = require('./index');

function dashedToCamel (dashed) {
  var words = dashed.split('-');

  return words.shift() + words.map(function (word) {
    return word.charAt(0).toUpperCase() + word.substr(1);
  }).join('');
}

module.exports = function (argv, opts) {
  var args = require('minimist')(argv.slice(2)),
      sources = args._.slice(0),
      options = iconify.$.extend(true, { transform: null }, opts),
      defaultOptions = iconify.load.defaultOptions;

  Object.getOwnPropertyNames(args).forEach(function (name) {
    if (name !== '_' && name !== '$0') {
      var camelName = dashedToCamel(name);

      if (defaultOptions[camelName] !== undefined || options[camelName] !== undefined) {
        options[camelName] = args[name];
      } else {
        throw new Error('Unknown option: ' + name + ' = ' + args[name]);
      }
    }
  });

  var initialInput = new stream.PassThrough({ objectMode: true }),
      transform = options.transform;

  [function (input, output) { // for now this default transform is always first
    input.on('data', function (item) {
      if (item.options.name === null || item.options.name === undefined) {
        item.options.name = path.basename(item.source)
          .replace(new RegExp(path.extname(item.source) + '$'), '');
      }

      output.write(item);
    });
  }].concat(typeof transform === 'string' ? transform.split(',') : transform || [])
    .map(function (transformer) {
      switch (typeof transformer) {
      case 'function':
        return transformer;
      case 'string':
        return require(transformer.indexOf('/') >= 0 ? path.resolve(transformer) : transformer);
      }
    })
    .reduce(function (input, transformer) {
      var output = new stream.PassThrough({ objectMode: true });

      input.on('end', function () {
        output.end();
      });
      transformer(input, output);

      return output;
    }, initialInput)
    .on('data', function (item) {
      iconify.load(item.source, item.options).fail(function (e) {
        /*eslint-disable no-console*/
        console.error(e.message);
        /*eslint-enable no-console*/
      });
    });

  sources.forEach(function (source) {
    initialInput.write({ source: source, options: iconify.$.extend(true, {}, options) });
  });

  initialInput.end();
};