--- /dev/null
+"use strict";
+
+const fs = require("fs");
+const hash = require("./hash");
+const path = require("path");
+/**
+ * Return the cacheFile to be used by stylelint, based on whether the provided parameter is
+ * a directory or looks like a directory (ends in `path.sep`), in which case the file
+ * name will be `cacheFile/.cache_hashOfCWD`.
+ *
+ * If cacheFile points to a file or looks like a file, then it will just use that file.
+ *
+ * @param {string} cacheFile - The name of file to be used to store the cache
+ * @param {string} cwd - Current working directory. Used for tests
+ * @returns {string} Resolved path to the cache file
+ */
+module.exports = function getCacheFile(cacheFile, cwd) {
+ /*
+ * Make sure path separators are normalized for environment/os.
+ * Also, keep trailing path separator if present.
+ */
+ cacheFile = path.normalize(cacheFile);
+
+ const resolvedCacheFile = path.resolve(cwd, cacheFile);
+ // If the last character passed is a path separator, we assume is a directory.
+ const looksLikeADirectory = cacheFile[cacheFile.length - 1] === path.sep;
+
+ /**
+ * Return the default cache file name when provided parameter is a directory.
+ * @returns {string} - Resolved path to the cacheFile
+ */
+ function getCacheFileForDirectory() {
+ return path.join(resolvedCacheFile, `.stylelintcache_${hash(cwd)}`);
+ }
+
+ let fileStats;
+
+ try {
+ fileStats = fs.lstatSync(resolvedCacheFile);
+ } catch (ex) {
+ fileStats = null;
+ }
+
+ if (looksLikeADirectory || (fileStats && fileStats.isDirectory())) {
+ // Return path to provided directory with generated file name.
+ return getCacheFileForDirectory();
+ }
+
+ // Return normalized path to cache file.
+ return resolvedCacheFile;
+};