gulp-contains/index.js

Throws an error if a string is found.

'use strict';

var through = require('through2');
var pluginError = require('plugin-error');

module.exports = function gulpContains(options) {
	if (typeof options === 'string' || options instanceof RegExp || Array.isArray(options)) {
		options = { search: options };
	}

	options.onFound = options.onFound || function (string, file, cb) {
		var error = 'Your file contains "' + string + '", it should not.';
		cb(new pluginError('gulp-contains', error));
	};

	return through.obj(function (file, enc, cb) {
		if (file.isNull()) {
			cb(null, file);
			return;
		}

		if (file.isStream()) {
			cb(new pluginError('gulp-contains', 'Streaming not supported'));
			return;
		}

		if (!options.search) {
			cb(new pluginError('gulp-contains', 'You did not specify a valid search string'));
			return;
		}

		var found = stringMatches(file.contents.toString(enc), options.search);

		if (found) {
			// You can return false to ignore the error
			var cancel = options.onFound(found, file, cb);

			if (cancel !== false) {
				return;
			}
		}

		cb(null, file);
	});
};

function stringMatches(str, search) {
	if (typeof search === 'string') {
		return (str.indexOf(search) !== -1) ? search : false;
	}
	if (search instanceof RegExp) {
		return (str.match(search)) ? search : false;
	}

	for (var i = 0; i < search.length; i++) {
		if (stringMatches(str, search[i])) {
			return search[i];
		}
	}

	return false;
}