From 36fa19032dbb132c25cf594c2cf06276d94ef573 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niklas=20B=C3=A4ckstr=C3=B6m?= <niklas.backstrom@hiq.fi>
Date: Thu, 22 Jun 2017 10:50:47 +0300
Subject: [PATCH] Issue #1 - Tasks using Pattern matching for finding files now
 throw an exception if the directory does not exist or the user does not have
 read access to the directory.

---
 Frends.File.Tests/UnitTest.cs | 14 ++++++++++++++
 Frends.File/File.cs           |  7 +++++++
 2 files changed, 21 insertions(+)

diff --git a/Frends.File.Tests/UnitTest.cs b/Frends.File.Tests/UnitTest.cs
index 3b2116d..4e32b15 100644
--- a/Frends.File.Tests/UnitTest.cs
+++ b/Frends.File.Tests/UnitTest.cs
@@ -239,6 +239,20 @@ public void FindFiles()
             Assert.That(results.All(x => x.Extension.Equals(".xml")));
         }
 
+        [Test]
+        public void FindFilesShouldThrowIfFolderNotExist()
+        {
+            var ex = Assert.Throws<Exception>(() => File.Find(
+                new FindInput()
+                {
+                    Directory = "DoesNotExist",
+                    Pattern = "**.*"
+                },
+                new FindOption()));
+
+            Assert.That(ex.Message, Does.Contain("Directory does not exist or you do not have read access"));
+        }
+
         [Test]
         public async Task WriteFileAppend()
         {
diff --git a/Frends.File/File.cs b/Frends.File/File.cs
index 4f27723..116f27b 100644
--- a/Frends.File/File.cs
+++ b/Frends.File/File.cs
@@ -132,6 +132,13 @@ private static TResult ExecuteAction<TResult>(Func<TResult> action, bool useGive
 
         internal static PatternMatchingResult FindMatchingFiles(string directoryPath, string pattern)
         {
+            // Check the user can access the folder
+            // This will return false if the path does not exist or you do not have read permissions.
+            if (!Directory.Exists(directoryPath))
+            {
+                throw new Exception($"Directory does not exist or you do not have read access. Tried to access directory '{directoryPath}'");
+            }
+
             var matcher = new Matcher();
             matcher.AddInclude(pattern);
             var results = matcher.Execute(new DirectoryInfoWrapper(new DirectoryInfo(directoryPath)));