added SolutionFinder

Author: Aaronontheweb

src/Incrementalist/FileSystem/SolutionFinder.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+
+namespace Incrementalist.FileSystem
+{
+    /// <summary>
+    /// Used to look for .sln files in a given directory.
+    /// </summary>
+    public static class SolutionFinder
+    {
+        /// <summary>
+        /// The default filter used to look for solutions in a given folder.
+        /// </summary>
+        public const string DefaultSolutionFilter = "*.sln";
+
+        /// <summary>
+        /// Enumerate all of the MSBuild solution files in a given folder.
+        /// </summary>
+        /// <param name="folderPath">The top level path to search.</param>
+        /// <param name="searchFilter">Optional. A wildcard filter in the form of "*.sln".</param>
+        /// <param name="searchOption">Optional. Specifies whether to recurse sub-directories or not.</param>
+        /// <returns>If any solutions are found, will return an enumerable list of them in order in which they are discovered.</returns>
+        public static IEnumerable<string> GetSolutions(string folderPath, string searchFilter = null, SearchOption? searchOption = null)
+        {
+            if (string.IsNullOrEmpty(searchFilter))
+            {
+                return Directory.EnumerateFileSystemEntries(folderPath, DefaultSolutionFilter, searchOption ?? SearchOption.AllDirectories);
+            }
+
+            return Directory.EnumerateFileSystemEntries(folderPath, searchFilter, searchOption ?? SearchOption.AllDirectories);
+
+        }
+    }
+}