Synnefo » Pithos MS Client

using System;

using System.Collections.Generic;

using System.Diagnostics.Contracts;

using System.Linq;

using System.Text;

using System.IO;

using System.Text.RegularExpressions;

using System.Threading.Tasks;

namespace Pithos.Interfaces

{

    public static class FileInfoExtensions

    {

        public static  string AsRelativeTo(this FileInfo fileInfo,string path )

        {

            if (String.IsNullOrWhiteSpace(path))

                throw new ArgumentNullException("path");            

            Contract.EndContractBlock();

            Contract.Assume(Enum.IsDefined(typeof(StringComparison),StringComparison.InvariantCultureIgnoreCase));

            if (!path.EndsWith("\\"))

                path=path.ToLower() + "\\";

            int pathLength = path.Length;            

            var filePath = fileInfo.FullName;

            if (!filePath.StartsWith(path,StringComparison.InvariantCultureIgnoreCase))

                throw new ArgumentException(String.Format("The path {0} doesn't contain the file {1}",path,filePath));

            var relativePath = filePath.Substring(pathLength, filePath.Length - pathLength);

            return relativePath;

        }

        public static string AsRelativeUrlTo(this FileInfo fileInfo,string path )

        {

            if (String.IsNullOrWhiteSpace(path))

                throw new ArgumentNullException("path");

            Contract.EndContractBlock();

            var relativePath = fileInfo.AsRelativeTo(path);

            var replacedSlashes = relativePath.Replace("\\","/");

            var escaped = Uri.EscapeUriString(replacedSlashes);

            return escaped;

        }

        public static string RelativeUriToFilePath(this Uri uri)

        {

            var unescaped = Uri.UnescapeDataString(uri.ToString());

            var path = unescaped.Replace("/", "\\");

            return path;

        }

    }

}