public static bool IsSingleProjectItemSelection()

in src/Microsoft.VisualStudio.SlowCheetah.VS/Utilities/ProjectUtilities.cs [45:112]
57 lines of code
14 McCabe index (conditional complexity)

        public static bool IsSingleProjectItemSelection(out IVsHierarchy hierarchy, out uint itemid)
        {
            hierarchy = null;
            itemid = VSConstants.VSITEMID_NIL;
            int hr = VSConstants.S_OK;

            IVsMonitorSelection monitorSelection = Package.GetGlobalService(typeof(SVsShellMonitorSelection)) as IVsMonitorSelection;
            IVsSolution solution = Package.GetGlobalService(typeof(SVsSolution)) as IVsSolution;
            if (monitorSelection == null || solution == null)
            {
                return false;
            }

            IVsMultiItemSelect multiItemSelect = null;
            IntPtr hierarchyPtr = IntPtr.Zero;
            IntPtr selectionContainerPtr = IntPtr.Zero;

            try
            {
                hr = monitorSelection.GetCurrentSelection(out hierarchyPtr, out itemid, out multiItemSelect, out selectionContainerPtr);

                if (ErrorHandler.Failed(hr) || hierarchyPtr == IntPtr.Zero || itemid == VSConstants.VSITEMID_NIL)
                {
                    // there is no selection
                    return false;
                }

                if (multiItemSelect != null)
                {
                    // multiple items are selected
                    return false;
                }

                if (itemid == VSConstants.VSITEMID_ROOT)
                {
                    // there is a hierarchy root node selected, thus it is not a single item inside a project
                    return false;
                }

                hierarchy = Marshal.GetObjectForIUnknown(hierarchyPtr) as IVsHierarchy;
                if (hierarchy == null)
                {
                    return false;
                }

                Guid guidProjectID = Guid.Empty;

                if (ErrorHandler.Failed(solution.GetGuidOfProject(hierarchy, out guidProjectID)))
                {
                    return false; // hierarchy is not a project inside the Solution if it does not have a ProjectID Guid
                }

                // if we got this far then there is a single project item selected
                return true;
            }
            finally
            {
                if (selectionContainerPtr != IntPtr.Zero)
                {
                    Marshal.Release(selectionContainerPtr);
                }

                if (hierarchyPtr != IntPtr.Zero)
                {
                    Marshal.Release(hierarchyPtr);
                }
            }
        }