Added option to not extend file.data.

[scottfalkingham]

When using an auto generated json file such as the manifest from a cache buster, the generated keys may not be valid variable names in Swig.

{"js/script.js":"js/script.da39a3ee.js"}

To overcome this, a new option extend_filedata has been added. When set to false it sets file.data to data.filedata instead of extending data. This allows a user to use bracket-notation to access the invalid variable in Swig.

{{ filedata['js/script.js'] }}

By default extend_filedata is true.

[colynb]

Have you looked into the gulp-data plugin? You could do something like:

/*
  Get data via JSON file, keyed on filename.
*/
var swig = require('gulp-swig');
var data = require('gulp-data');

var getJsonData = function(file) {
  var data = {"js/script.js":"js/script.da39a3ee.js"};
  return { filedata: data }
};

gulp.task('json-test', function() {
  return gulp.src('./examples/test1.html')
    .pipe(data(getJsonData))
    .pipe(swig())
    .pipe(gulp.dest('build'));
});