plugin-barcode-scanner hook for minSDK

"use strict";
var path = require("path");
var fs = require("fs");

module.exports = function(ctx) {
	var q = ctx.requireCordovaModule("q");

	var deferreds = [];

	//note: https://github.com/phonegap/phonegap-plugin-barcodescanner/issues/233
	deferreds.push((function(deferred) {
		ctx.requireCordovaModule("glob")("phonegap-plugin-barcodescanner/*.gradle",
										 {
											 cwd:      path.join(ctx.opts.projectRoot, "platforms/android"),
											 realpath: true
										 },
										 function(errGlob, files) {
											 if (errGlob) {
												 return deferred.reject(errGlob);
											 }
											 return q.all(files.map(function(file) {
														 var fileDeferred = q.defer();
														 fs.readFile(file, "utf8", function(errRead, fileContent) {
															 if (errRead) {
																 return fileDeferred.reject(errRead);
															 }
															 var matchRegexp = /^ext\.cdvMinSdkVersion\s+=.*/mg;
															 if (!matchRegexp.test(fileContent)) {
																 return fileDeferred.resolve();
															 }
															 return fs.writeFile(file, fileContent.replace(matchRegexp, ""), "utf8", function(errWrite) {
																 if (errWrite) {
																	 return fileDeferred.reject(errWrite);
																 }
																 return fileDeferred.resolve();
															 });
														 });
														 return fileDeferred.promise;
													 }))
													 .then(function() {
														 return deferred.resolve();
													 }, function(err) {
														 return deferred.reject(err);
													 });
										 });
		return deferred.promise;
	})(q.defer()));

	return q.all(deferreds)
			.then(function() {
				return ctx;
			});
};