Copy Bower dependencies with Gulp

gulpfile.js

// Include our plug-ins
var gulp = require('gulp');
var bowerMain = require('bower-main');
var mainBowerFiles = require('main-bower-files');
var exists = require('path-exists').sync;
var gulpIgnore = require('gulp-ignore');

// Create some task
gulp.task( 'copy-bower-dep', function() {

	// Copy minified resources (Bower)
	gulp.src( bowerMain( 'js', 'min.js' ).minified, {base: './my-bower-components/dir'})
			.pipe( gulp.dest( './target/dist/lib' ));
	
	gulp.src( bowerMain( 'css', 'min.css' ).minified, {base: './my-bower-components/dir'})
			.pipe( gulp.dest( './target/dist/lib' ));
	
	// Copy non-minified resources (Bower)
	// Notice we filter these resources to distinguish which one are minified.
	gulp.src( mainBowerFiles(), {base: './my-bower-components/dir'})
			.pipe( gulpIgnore.include( keepNonMinified ))
			.pipe( gulp.dest( './target/dist/lib' ));
});

/*
 * A function that checks whether a Bower file has a minified version.
 */
function keepNonMinified( file ) {
	
	var keep = true;
	if( file.path.match( '\.js$' )) {
		var minPath = file.path.replace( '.js', '.min.js' );
		keep = ! exists( minPath );
		
	} else if( file.path.match( '\.css$' )) {
		var minPath = file.path.replace( '.css', '.min.css' );
		keep = ! exists( minPath );
	}
	
	// gutil.log( file.path + ' => ' + keep );
	return keep;
}

For the record, I posted a more simple solution here.