1 files changed, 60 insertions, 0 deletions

diff --git a/src/WixToolset.BuildTasks/FileSearchHelperMethods.cs b/src/WixToolset.BuildTasks/FileSearchHelperMethods.cs
new file mode 100644
index 00000000..6cc804eb
--- /dev/null
+++ b/src/WixToolset.BuildTasks/FileSearchHelperMethods.cs
@@ -0,0 +1,60 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.BuildTasks
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Diagnostics.CodeAnalysis;
+    using System.IO;
+    using System.Text;
+    using Microsoft.Build.Framework;
+
+    /// <summary>
+    /// Contains helper methods on searching for files
+    /// </summary>
+    public static class FileSearchHelperMethods
+    {
+        /// <summary>
+        /// Searches for the existence of a file in multiple directories. 
+        /// Search is satisfied if default file path is valid and exists. If not,
+        /// file name is extracted from default path and combined with each of the directories
+        /// looking to see if it exists. If not found, input default path is returned.
+        /// </summary>
+        /// <param name="directories">Array of directories to look in, without filenames in them</param>
+        /// <param name="defaultFullPath">Default path - to use if not found</param>
+        /// <returns>File path if file found. Empty string if not found</returns>
+        public static string SearchFilePaths(string[] directories, string defaultFullPath)
+        {
+            if (String.IsNullOrEmpty(defaultFullPath))
+            {
+                return String.Empty;
+            }
+
+            if (File.Exists(defaultFullPath))
+            {
+                return defaultFullPath;
+            }
+
+            if (directories == null)
+            {
+                return string.Empty;
+            }
+
+            string fileName = Path.GetFileName(defaultFullPath);
+            foreach (string currentPath in directories)
+            {
+                if (String.IsNullOrEmpty(currentPath) || String.IsNullOrEmpty(currentPath.Trim()))
+                {
+                    continue;
+                }
+
+                if (File.Exists(Path.Combine(currentPath, fileName)))
+                {
+                    return Path.Combine(currentPath, fileName);
+                }
+            }
+
+            return String.Empty;
+        }
+    }
+}