From 6842236967fe4f6ce3a58709468c871400a5029f Mon Sep 17 00:00:00 2001
From: Michael Becker <alcexhim@gmail.com>
Date: Fri, 29 May 2020 18:13:13 -0400
Subject: [PATCH] function to retrieve a file name in a case-sensitive (or
 case-insensitive) manner on traditionally unsupported filesystems

---
 MBS.Framework/IO/CaseSensitiveHandling.cs | 30 ++++++++++++
 MBS.Framework/IO/File.cs                  | 56 +++++++++++++++++++++++
 MBS.Framework/MBS.Framework.csproj        |  3 ++
 3 files changed, 89 insertions(+)
 create mode 100644 MBS.Framework/IO/CaseSensitiveHandling.cs
 create mode 100644 MBS.Framework/IO/File.cs

diff --git a/MBS.Framework/IO/CaseSensitiveHandling.cs b/MBS.Framework/IO/CaseSensitiveHandling.cs
new file mode 100644
index 0000000..c401fd4
--- /dev/null
+++ b/MBS.Framework/IO/CaseSensitiveHandling.cs
@@ -0,0 +1,30 @@
+//
+//  CaseSensitiveHandling.cs
+//
+//  Author:
+//       Michael Becker <alcexhim@gmail.com>
+//
+//  Copyright (c) 2020 Mike Becker's Software
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+using System;
+namespace MBS.Framework.IO
+{
+	public enum CaseSensitiveHandling
+	{
+		System = -1,
+		CaseInsensitive = 0,
+		CaseSensitive = 1
+	}
+}
diff --git a/MBS.Framework/IO/File.cs b/MBS.Framework/IO/File.cs
new file mode 100644
index 0000000..bf90f82
--- /dev/null
+++ b/MBS.Framework/IO/File.cs
@@ -0,0 +1,56 @@
+//
+//  File.cs
+//
+//  Author:
+//       Michael Becker <alcexhim@gmail.com>
+//
+//  Copyright (c) 2020 Mike Becker's Software
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+using System;
+namespace MBS.Framework.IO
+{
+	public class File
+	{
+		public static string Find(string filename, CaseSensitiveHandling caseSensitiveHandling = CaseSensitiveHandling.System)
+		{
+			string fn1 = System.IO.Path.GetFileName(filename);
+
+			if ((Environment.OSVersion.Platform == PlatformID.Unix && caseSensitiveHandling == CaseSensitiveHandling.CaseInsensitive) ||
+				((Environment.OSVersion.Platform == PlatformID.MacOSX || Environment.OSVersion.Platform == PlatformID.Win32Windows) && caseSensitiveHandling == CaseSensitiveHandling.CaseSensitive))
+			{
+				// do some extra work to return case-insensitive file on *nix
+				string dirname = System.IO.Path.GetDirectoryName(filename);
+				if (String.IsNullOrEmpty(dirname))
+					return filename;
+
+				string[] files = System.IO.Directory.GetFiles(dirname, "*", System.IO.SearchOption.TopDirectoryOnly);
+				for (int i = 0; i < files.Length; i++)
+				{
+					string fn = System.IO.Path.GetFileName(files[i]);
+					if ((caseSensitiveHandling == CaseSensitiveHandling.CaseInsensitive && fn.ToUpper() == fn1.ToUpper())
+						|| (caseSensitiveHandling == CaseSensitiveHandling.CaseSensitive && fn == fn1))
+						return files[i];
+				}
+				return null;
+			}
+			else
+			{
+				if (System.IO.File.Exists(filename))
+					return filename;
+				return null;
+			}
+		}
+	}
+}
diff --git a/MBS.Framework/MBS.Framework.csproj b/MBS.Framework/MBS.Framework.csproj
index d52d765..0c789ed 100644
--- a/MBS.Framework/MBS.Framework.csproj
+++ b/MBS.Framework/MBS.Framework.csproj
@@ -68,11 +68,14 @@
     <Compile Include="Logic\Conditional\ConditionGroup.cs" />
     <Compile Include="Logic\Conditional\Condition.cs" />
     <Compile Include="SeekDirection.cs" />
+    <Compile Include="IO\File.cs" />
+    <Compile Include="IO\CaseSensitiveHandling.cs" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="Logic\" />
     <Folder Include="Logic\Expressions\" />
     <Folder Include="Logic\Conditional\" />
+    <Folder Include="IO\" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
 </Project>