public static string GetRelativePath()

in SharpGenTools.Sdk/Internal/Roslyn/PathUtilities.cs [507:559]
39 lines of code
10 McCabe index (conditional complexity)

        public static string GetRelativePath(string directory, string fullPath)
        {
            string relativePath = string.Empty;

            if (IsChildPath(directory, fullPath))
            {
                return GetRelativeChildPath(directory, fullPath);
            }

            var directoryPathParts = GetPathParts(directory);
            var fullPathParts = GetPathParts(fullPath);

            if (directoryPathParts.Length == 0 || fullPathParts.Length == 0)
            {
                return fullPath;
            }

            int index = 0;

            // find index where full path diverges from base path
            for (; index < directoryPathParts.Length; index++)
            {
                if (!PathsEqual(directoryPathParts[index], fullPathParts[index]))
                {
                    break;
                }
            }

            // if the first part doesn't match, they don't even have the same volume
            // so there can be no relative path.
            if (index == 0)
            {
                return fullPath;
            }

            // add backup notation for remaining base path levels beyond the index
            var remainingParts = directoryPathParts.Length - index;
            if (remainingParts > 0)
            {
                for (int i = 0; i < remainingParts; i++)
                {
                    relativePath = relativePath + ParentRelativeDirectory + DirectorySeparatorStr;
                }
            }

            // add the rest of the full path parts
            for (int i = index; i < fullPathParts.Length; i++)
            {
                relativePath = CombinePathsUnchecked(relativePath, fullPathParts[i]);
            }

            return relativePath;
        }