wagtail/gulpfile.js/lib/rename-src-to-dest.js

var path = require('path');
var rename = require('gulp-rename');
var config = require('../config');

/**
 * Returns a configured gulp-rename to pipe from asset sources to dest.
 * Usage: .pipe(renameSrcToDest())
 */
var renameSrcToDest = function(log) {
    return rename(function(filePath) {
        if (log) console.log(filePath.dirname + path.sep + filePath.basename + filePath.extname);
        filePath.dirname = filePath.dirname.replace(
            path.sep + config.srcDir + path.sep,
            path.sep + config.destDir + path.sep);
        if (log) console.log(filePath.dirname);
    });
};

module.exports = renameSrcToDest;