From 1bed62ee80f217a2318e2165ea7ae15cf181cb13 Mon Sep 17 00:00:00 2001
From: Michael Becker <alcexhim@gmail.com>
Date: Sun, 8 Dec 2019 19:29:09 -0500
Subject: [PATCH] file name shortener for 8.3 filenames, etc.

---
 .../IO/FileNameShortener.cs                   | 60 +++++++++++++++++++
 .../UniversalEditor.Core.csproj               |  1 +
 2 files changed, 61 insertions(+)
 create mode 100644 CSharp/Libraries/UniversalEditor.Core/IO/FileNameShortener.cs

diff --git a/CSharp/Libraries/UniversalEditor.Core/IO/FileNameShortener.cs b/CSharp/Libraries/UniversalEditor.Core/IO/FileNameShortener.cs
new file mode 100644
index 00000000..ed958424
--- /dev/null
+++ b/CSharp/Libraries/UniversalEditor.Core/IO/FileNameShortener.cs
@@ -0,0 +1,60 @@
+//
+//  FileNameShortener - truncates a file name with the MS-DOS style filena~1.ext
+//
+//  Author:
+//       Mike Becker <alcexhim@gmail.com>
+//
+//  Copyright (c) 2019 Mike Becker
+//
+//  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;
+using System.Collections.Generic;
+
+namespace UniversalEditor.IO
+{
+	public class FileNameShortener
+	{
+		private Dictionary<string, int> _TruncatedCount = new Dictionary<string, int>();
+
+		public int MaxFileNameLength { get; set; } = 8;
+		public int MaxExtensionLength { get; set; } = 3;
+		public int Count { get; set; } = 0;
+
+		public string Shorten(string value)
+		{
+			string filename = System.IO.Path.GetFileNameWithoutExtension(value);
+			string extension = System.IO.Path.GetExtension(value);
+			if (extension.StartsWith("."))
+				extension = extension.Substring(1);
+
+			filename = filename.Replace(".", String.Empty);
+
+			if (filename.Length <= MaxFileNameLength && extension.Length <= MaxExtensionLength)
+				return filename + '.' + extension;
+
+			extension = extension.Substring(0, MaxExtensionLength);
+
+			int len = Math.Min(filename.Length, MaxFileNameLength) - 1 - Count.ToString().Length;// with ~xx.xxx
+			string truncated = filename.Substring(0, len);
+			string truncatedWithExtension = truncated + '.' + extension;
+			if (!_TruncatedCount.ContainsKey(truncatedWithExtension))
+			{
+				_TruncatedCount[truncatedWithExtension] = 0;
+			}
+			_TruncatedCount[truncatedWithExtension]++;
+
+			return truncated + '~' + _TruncatedCount[truncatedWithExtension].ToString() + '.' + extension;
+		}
+	}
+}
diff --git a/CSharp/Libraries/UniversalEditor.Core/UniversalEditor.Core.csproj b/CSharp/Libraries/UniversalEditor.Core/UniversalEditor.Core.csproj
index e9f46160..a46fc118 100644
--- a/CSharp/Libraries/UniversalEditor.Core/UniversalEditor.Core.csproj
+++ b/CSharp/Libraries/UniversalEditor.Core/UniversalEditor.Core.csproj
@@ -87,6 +87,7 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Ptr.cs" />
     <Compile Include="References.cs" />
+    <Compile Include="IO\FileNameShortener.cs" />
   </ItemGroup>
   <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />