micro-build-server/DotNetBuilder/PathTools.cs

using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;

namespace MicroBuildServer.DotNetBuilder
{
	static class PathTools
	{
		private const string UNC_PREFIX = "\\\\?\\";

		const int MAX_PATH = 255;

		[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
		public static extern int GetShortPathName(
			[MarshalAs(UnmanagedType.LPTStr)] string path,
			[MarshalAs(UnmanagedType.LPTStr)] StringBuilder shortPath,
			int shortPathLength);

		private static string GetShortPath(string path)
		{
			var shortPath = new StringBuilder(MAX_PATH);
			GetShortPathName(path, shortPath, MAX_PATH);
			return shortPath.ToString();
		}

		private static string OptimizeDirectoryPath(string fullPath)
		{
			var uncPath = UNC_PREFIX + fullPath;
			var shortPath = GetShortPath(uncPath);
			if (shortPath.StartsWith(UNC_PREFIX))
			{
				shortPath = shortPath.Substring(UNC_PREFIX.Length);
			}
			return shortPath;
		}
		
		public static string OptimizePath(string rawPath)
		{
			//Console.WriteLine(rawPath);
			var fullPath = Path.GetFullPath(new Uri(rawPath).LocalPath);
			string result;
			if (Directory.Exists(fullPath))
			{
				result = OptimizeDirectoryPath(fullPath);
			}
			else
			{
				var directoryPath = Path.GetDirectoryName(fullPath);
				var optimizedDirectoryPath = OptimizeDirectoryPath(directoryPath);
				result = Path.Combine(optimizedDirectoryPath, Path.GetFileName(fullPath));
			}
			//Console.WriteLine(result);
			return result;
		}
	}
}