var gulp = require('gulp'),
    sass = require('gulp-sass'),
    path = require('path'),
    resolveDependents = require('gulp-resolve-dependents');

function sassResolver(filePath, fileContents){
  var match, result = [],
      pattern = /import "(.+?)";/mg;
  while((match = pattern.exec(fileContents)) !== null){
    result.push(path.resolve(path.dirname(filePath), match[1]));
  }
  return result;
}

gulp.task('default', function(){
    gulp.src('./src/lib/example.scss')
    .pipe(resolveDependents({
          files: './src/**/*.scss',
          resolver: sassResolver,
          basePath: './src'
    }))
    .pipe(sass())
    .pipe(gulp.dest('./dest/css'));
});