[Question] How to automatically check background color?

Hi!

I'm currently trying to write test script for checking background type (based on terminal color) in Vim. I have 'dark' terminal, so Vim normally recognizes it and sets 'background' to 'dark', but when I use:

$ vim -c 'redir @">|silent set bg?|redir END|enew|put|w! testfile|q'

then I have 'backgroung=light' (I think it is default, according some test scripts in src/testdir). Vim will probably communicate with terminal about background after my command is done, so the value is correct in fully loaded Vim... is there a way how to get correct value of 'background'?

Thank you in advance and have a nice day,

Zdenek

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