Add option to maintain the source tree when generating IDE project file.

[directmusic]

Is your feature request related to a problem? Please describe.

I tend to use Xcode as an IDE for development and would like to use xmake to generate the projects however I am sorely missing the ability to generate a file with the Source Tree intact.

Describe the solution you'd like

I would love an option in xmake for generating the CMakeLists.txt file with something along the lines of source_group(Source ${CMAKE_CURRENT_SOURCE_DIR}) to maintain the folder structure.

Describe alternatives you've considered

I am currently manually appending source_group(Source ${CMAKE_CURRENT_SOURCE_DIR}) to the CMakeLists.txt file manually.

[waruqi]

Currently, xmake only supports indirect generation of xcode project files by generating cmakelist.txt, and does not consider supporting custom source trees. You can directly modify the generated cmakelist.txt

Maybe in the future, when xmake can directly generate xcode files, it will handle this problem better.

[waruqi]

I have supported it on dev. #2282

we can use add_filegroups for cmake/vs/vsxmake/xcode generator