emacs equivalent of vim's bg=dark? (setting background to dark)

Question

In vim, I can run set bg=dark and then vim will adjust all syntax highlighting to work on a terminal with a dark background (whether or not the background actually is dark, vim will assume that it is).

How do I tell emacs to assume that the background is either dark or light?

Answer 1

I've used the invert-face function in the past:

(invert-face 'default)

Or:

M-x invert-face <RET> default

Answer 2

I think the best approach to use is to use ColorTheme. Other options to customize the frame colors you can find here. I can't think about a single command, however you can start emacs with --reverse-video.

Answer 3

M-x set-variable <RET> frame-background-mode <RET> dark

see also the bottom of https://www.gnu.org/software/emacs/manual/html_node/elisp/Defining-Faces.html