Set correct from and to options for using with source maps.

[Panya]

When you are using autoprefixer-stylus with source maps, like:

stylus style.styl -u autoprefixer-stylus -m

now autoprefixer detects sourceMappingURL in the compiled css and rewrites it to sourceMappingURL=to.css (and breaks Stylus' source map link). This is important to set correct from and to options in the autoprefixer-core lib (see autoprefixer-core usage for more info).

I suggest to set these options automatically in the plugin:

var ap = require('autoprefixer-core')
  , path = require('path');

module.exports = function(opts) {
  return function(style){
    style = this || style;
    var filename = style.options.filename;

    style.on('end', function(err, css){
      var processOptions = {
        from: filename,
        to: path.join(
          path.dirname(filename),
          path.basename(filename, path.extname(filename))
        ) + '.css'
      };

      if (opts) return ap(opts).process(css, processOptions).css;
      return ap.process(css, processOptions).css;
    });
  }
};

[jescalan]

Hey @Panya -- thanks for the heads up. I'll get these changes in and shipped shortly 👬

[jescalan]

Closed by 74bba65 and released as 0.3.1

[Panya]

Thanks for the fix 👍