private static void EnsureVersion(string version)
        {
            var comparer = new AmmyVersionComparer();

            // If Ammy version is lower than 1.2.21 show message box
            if (comparer.Compare("Ammy" + version, "Ammy.1.2.20") < 0 && version != ".1.0.0")
            {
                throw new DirectoryNotFoundException("Please update Ammy NuGet package. " + Environment.NewLine + Environment.NewLine +
                                                     "Current extension is not compatible with packages older than 1.2.21");
            }
        }
        private static string GetAssemblyDirectory(Project project, DTE dte)
        {
            var    nl   = Environment.NewLine;
            var    proj = (VSProject)project.Object;
            var    sidekickReference = proj.References.Cast <Reference>().FirstOrDefault(r => r.Path.EndsWith("AmmySidekick.dll", StringComparison.InvariantCultureIgnoreCase));
            string packagesPath      = null;

            if (sidekickReference != null)
            {
                var match = Regex.Match(sidekickReference.Path, @"(.+packages\\Ammy)\.\w+((?:\.\d+){3})");
                if (match.Success && match.Groups.Count >= 3)
                {
                    var version = match.Groups[2].Value;
                    packagesPath = match.Groups[1].Value + version + "\\build";
                    EnsureVersion(version);
                }
                else
                {
                    match = Regex.Match(sidekickReference.Path, @"(.+packages\\Ammy)\.\w+\\(\d+\.\d+\.\d+)");
                    if (match.Success && match.Groups.Count >= 3)
                    {
                        packagesPath = match.Groups[1].Value + "\\" + match.Groups[2].Value + "\\build";
                    }
                }
            }

            if (packagesPath == null)
            {
                var solutionDirectoryName = Path.GetDirectoryName(dte.Solution.FullName);
                if (solutionDirectoryName == null)
                {
                    throw new DirectoryNotFoundException("Ammy extension couldn't find solution directory");
                }

                var packagesFolder  = Path.Combine(solutionDirectoryName, "packages");
                var comparer        = new AmmyVersionComparer();
                var ammyPackagePath = Directory.GetDirectories(packagesFolder)
                                      .Where(path => Regex.IsMatch(path, @"Ammy\.\d+\.\d+\.\d+"))
                                      .OrderByDescending(path => path, comparer)
                                      .FirstOrDefault();

                if (ammyPackagePath != null)
                {
                    packagesPath = Path.Combine(ammyPackagePath, "build");
                }
            }

            if (packagesPath == null)
            {
                throw new DirectoryNotFoundException("Ammy extension couldn't find packages directory." + nl + nl +
                                                     "Run `install-package Ammy` in Package Manager Console and restart Visual Studio");
            }

            return(packagesPath);

            // Can't copy files from here, because they a being loaded into VS by msbuild first
            // Need a Task that would copy contents of `Ammy.x.x.x\build` into temp directory before compilation

            //try {
            //    var tempPath = Path.GetTempPath();
            //    var packageDirectoryName = new DirectoryInfo(ammyPackagePath).Name;
            //    var runtimeDirectoryPath = Path.Combine(tempPath, packageDirectoryName);

            //    if (!Directory.Exists(runtimeDirectoryPath))
            //        Directory.CreateDirectory(runtimeDirectoryPath);

            //    var files = Directory.GetFiles(ammyPackageBuildPath);

            //    foreach (var file in files) {
            //        try {
            //            var dest = Path.GetFileName(file);
            //            File.Copy(file, Path.Combine(runtimeDirectoryPath, dest));
            //        } catch {
            //        }
            //    }

            //    return runtimeDirectoryPath;
            //} catch {
            //    return ammyPackageBuildPath;
            //}
        }