Horizon – Rev 1

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using System;
using System.IO;

namespace Horizon.Utilities
{
    /// <summary>
    ///     Various extensions for dealing with subpaths.
    /// </summary>
    /// <remarks>https://stackoverflow.com/questions/5617320/given-full-path-check-if-path-is-subdirectory-of-some-other-path-or-otherwise</remarks>
    public static class Subpaths
    {
        #region Public Methods

        public static string NormalizePath(this string path)
        {
            return Path.GetFullPath(path.Replace('/', '\\').WithEnding("\\"));
        }

        /// <summary>
        ///     Returns true if <paramref name="path" /> starts with the path <paramref name="baseDirPath" />.
        ///     The comparison is case-insensitive, handles / and \ slashes as folder separators and
        ///     only matches if the base dir folder name is matched exactly ("c:\foobar\file.txt" is not a sub path of "c:\foo").
        /// </summary>
        public static bool IsSubPathOf(this string path, string baseDirPath)
        {
            var normalizedPath = NormalizePath(path);

            var normalizedBaseDirPath = NormalizePath(baseDirPath);

            return normalizedPath.StartsWith(normalizedBaseDirPath, StringComparison.OrdinalIgnoreCase);
        }

        public static bool IsPathEqual(this string path, string that)
        {
            return string.Equals(NormalizePath(path), NormalizePath(that), StringComparison.OrdinalIgnoreCase);
        }

        #endregion

        #region Private Methods

        /// <summary>
        ///     Returns <paramref name="str" /> with the minimal concatenation of <paramref name="ending" /> (starting from end)
        ///     that
        ///     results in satisfying .EndsWith(ending).
        /// </summary>
        /// <example>"hel".WithEnding("llo") returns "hello", which is the result of "hel" + "lo".</example>
        private static string WithEnding(this string str, string ending)
        {
            if (str == null)
            {
                return ending;
            }

            var result = str;

            // Right() is 1-indexed, so include these cases
            // * Append no characters
            // * Append up to N characters, where N is ending length
            for (var i = 0; i <= ending.Length; i++)
            {
                var tmp = result + ending.Right(i);
                if (tmp.EndsWith(ending))
                {
                    return tmp;
                }
            }

            return result;
        }

        /// <summary>Gets the rightmost <paramref name="length" /> characters from a string.</summary>
        /// <param name="value">The string to retrieve the substring from.</param>
        /// <param name="length">The number of characters to retrieve.</param>
        /// <returns>The substring.</returns>
        private static string Right(this string value, int length)
        {
            if (value == null)
            {
                throw new ArgumentNullException("value");
            }

            if (length < 0)
            {
                throw new ArgumentOutOfRangeException("length", length, "Length is less than zero");
            }

            return length < value.Length ? value.Substring(value.Length - length) : value;
        }

        #endregion
    }
}

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