Add NuGet functions to add WebView / WinRT packages.

nuget.cmake

@@ -0,0 +1,126 @@
+# This file is part of Desktop App Toolkit,
+# a set of libraries for developing nice desktop applications.
+#
+# For license and copyright information please follow this link:
+# https://github.com/desktop-app/legal/blob/master/LEGAL
+
+function(nuget_add_package package_name package package_version)
+    if (NOT DEFINED NUGET_EXE_PATH)
+        # Thanks https://github.com/clarkezone/flutter_win_webview/blob/master/webview_popupauth/windows/CMakeLists.txt
+        find_program(NUGET_EXE NAMES nuget)
+        if (NOT NUGET_EXE)
+            message("NUGET.EXE not found.")
+            message(FATAL_ERROR "Please install this executable, and run CMake again.")
+        endif()
+        set(NUGET_EXE_PATH ${NUGET_EXE} PARENT_SCOPE)
+    else()
+        set(NUGET_EXE ${NUGET_EXE_PATH})
+    endif()
+
+    set(package_key NUGET_${package_name}_VERSION)
+    if (NOT DEFINED ${package_key})
+        set(packages_loc ${CMAKE_BINARY_DIR}/packages)
+        file(MAKE_DIRECTORY ${packages_loc})
+
+        set(${package_key} ${package_version})
+        execute_process(
+        COMMAND
+            ${NUGET_EXE}
+            install
+            ${package}
+            -Version ${package_version}
+            -ExcludeVersion
+            -OutputDirectory ${packages_loc}
+        )
+        set(${package_name}_loc ${CMAKE_BINARY_DIR}/packages/${package} PARENT_SCOPE)
+    elseif ("${${package_key}}" != ${package_version})
+        message(FATAL_ERROR "Package ${package_name} requested with both ${${package_key}} and ${package_version}")
+    endif()
+endfunction()
+
+function(nuget_add_webview target_name)
+    nuget_add_package(webview2 "Microsoft.Web.WebView2" 1.0.864.35)
+
+    set(webview2_loc_native ${webview2_loc}/build/native)
+    # target_link_libraries(${target_name}
+    # PRIVATE
+    #     ${webview2_loc_native}/Microsoft.Web.WebView2.targets
+    #     ${src_loc}/ForceStaticLink.targets
+    # )
+    #
+    # This works, but just to be sure, manually link to static library.
+    #
+    target_include_directories(${target_name}
+    PRIVATE
+        ${webview2_loc_native}/include
+    )
+    if (build_win64)
+        set(webview2_lib_folder x64)
+    else()
+        set(webview2_lib_folder x86)
+    endif()
+    target_link_libraries(${target_name}
+    PRIVATE
+        ${webview2_loc_native}/${webview2_lib_folder}/WebView2LoaderStatic.lib
+    )
+
+endfunction()
+
+function(nuget_add_winrt target_name)
+    nuget_add_package(winrt "Microsoft.Windows.CppWinRT" 2.0.210505.3)
+
+    set(gen_dst ${CMAKE_BINARY_DIR}/packages/gen)
+    file(MAKE_DIRECTORY ${gen_dst}/winrt)
+
+    set(winrt_sdk_version ${CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION})
+    set(winrt_version_key ${gen_dst}/winrt/version_key)
+    set(winrt_version_test ${winrt_version_key}_test)
+    set(sdk_version_key ${gen_dst}/winrt/sdk_version_key)
+    set(sdk_version_test ${sdk_version_key}_test)
+
+    execute_process(
+    COMMAND
+        ${winrt_loc}/bin/cppwinrt
+        /?
+    OUTPUT_FILE
+        ${winrt_version_test}
+    )
+    execute_process(
+    COMMAND
+        echo
+        ${winrt_sdk_version}
+    OUTPUT_FILE
+        ${sdk_version_test}
+    )
+    execute_process(
+    COMMAND
+        ${CMAKE_COMMAND} -E compare_files ${winrt_version_key} ${winrt_version_test}
+        RESULT_VARIABLE winrt_version_compare_result
+    )
+    execute_process(
+    COMMAND
+        ${CMAKE_COMMAND} -E compare_files ${sdk_version_key} ${sdk_version_test}
+        RESULT_VARIABLE sdk_version_compare_result
+    )
+    if (winrt_version_compare_result EQUAL 0 AND sdk_version_compare_result EQUAL 0)
+        message("Using existing WinRT headers.")
+    else()
+        message("Generating new WinRT headers.")
+
+        execute_process(
+        COMMAND
+            ${winrt_loc}/bin/cppwinrt
+            -input ${winrt_sdk_version}
+            -output ${gen_dst}
+        COMMAND
+            cp ${winrt_version_test} ${winrt_version_key}
+        COMMAND
+            cp ${sdk_version_test} ${sdk_version_key}
+        )
+    endif()
+
+    target_include_directories(${target_name}
+    PRIVATE
+        ${gen_dst}
+    )
+endfunction()