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//
// GetRelPath.cs
//
// Author:
// Antonius Riha <antoniusriha@gmail.com>
//
// Copyright (c) 2012 Antonius Riha
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.IO;
using System.Text;
using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;
namespace Tasque.Build
{
public class GetRelPath : Task
{
[Required]
public string FromPath { get; set; }
[Required]
public string ToPath { get; set; }
[Output]
public string RelativePath { get; set; }
public override bool Execute ()
{
try {
RelativePath = InternalGetRelPath (FromPath, ToPath);
} catch (Exception ex) {
Log.LogErrorFromException (ex, true);
return false;
}
return true;
}
internal static string InternalGetRelPath (string fromPath, string toPath)
{
if (fromPath == null)
throw new ArgumentNullException ("fromPath");
if (toPath == null)
throw new ArgumentNullException ("toPath");
// normalize
fromPath = NormalizePath.InternalNormalizePath (Path.GetFullPath (fromPath));
toPath = NormalizePath.InternalNormalizePath (Path.GetFullPath (toPath));
var basePathPieces = fromPath.Split (Path.DirectorySeparatorChar);
var targetPathPieces = toPath.Split (Path.DirectorySeparatorChar);
var max = Math.Min (basePathPieces.Length, targetPathPieces.Length);
int i = 0;
for (; i < max; i++)
if (basePathPieces [i] != targetPathPieces [i])
break;
StringBuilder fromBranch = new StringBuilder (), toBranch = new StringBuilder ();
for (int j = i; j < basePathPieces.Length; j++)
fromBranch.Append (".." + Path.DirectorySeparatorChar.ToString ());
for (int j = i; j < targetPathPieces.Length; j++)
toBranch.Append (targetPathPieces [j] + Path.DirectorySeparatorChar.ToString ());
var toBranchString = toBranch.ToString ();
var result = fromBranch.Append (toBranchString).ToString ();
return result.TrimEnd (Path.DirectorySeparatorChar);
}
}
}
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