added unit testing, and started implementing unit tests...phew

node_modules/findup-sync/index.js

@@ -0,0 +1,85 @@
+'use strict';
+
+/**
+ * Module dependencies
+ */
+
+var fs = require('fs');
+var path = require('path');
+var isGlob = require('is-glob');
+var resolveDir = require('resolve-dir');
+var detect = require('detect-file');
+var mm = require('micromatch');
+
+/**
+ * @param  {String|Array} `pattern` Glob pattern or file path(s) to match against.
+ * @param  {Object} `options` Options to pass to [micromatch]. Note that if you want to start in a different directory than the current working directory, specify the `options.cwd` property here.
+ * @return {String} Returns the first matching file.
+ * @api public
+ */
+
+module.exports = function(patterns, options) {
+  options = options || {};
+  var cwd = path.resolve(resolveDir(options.cwd || ''));
+
+  if (typeof patterns === 'string') {
+    return lookup(cwd, [patterns], options);
+  }
+
+  if (!Array.isArray(patterns)) {
+    throw new TypeError('findup-sync expects a string or array as the first argument.');
+  }
+
+  return lookup(cwd, patterns, options);
+};
+
+function lookup(cwd, patterns, options) {
+  var len = patterns.length;
+  var idx = -1;
+  var res;
+
+  while (++idx < len) {
+    if (isGlob(patterns[idx])) {
+      res = matchFile(cwd, patterns[idx], options);
+    } else {
+      res = findFile(cwd, patterns[idx], options);
+    }
+    if (res) {
+      return res;
+    }
+  }
+
+  var dir = path.dirname(cwd);
+  if (dir === cwd) {
+    return null;
+  }
+  return lookup(dir, patterns, options);
+}
+
+function matchFile(cwd, pattern, opts) {
+  var isMatch = mm.matcher(pattern, opts);
+  var files = tryReaddirSync(cwd);
+  var len = files.length;
+  var idx = -1;
+
+  while (++idx < len) {
+    var name = files[idx];
+    var fp = path.join(cwd, name);
+    if (isMatch(name) || isMatch(fp)) {
+      return fp;
+    }
+  }
+  return null;
+}
+
+function findFile(cwd, filename, options) {
+  var fp = cwd ? path.resolve(cwd, filename) : filename;
+  return detect(fp, options);
+}
+
+function tryReaddirSync(fp) {
+  try {
+    return fs.readdirSync(fp);
+  } catch(err) {}
+  return [];
+}