Enable image backends on macOS

[yoichi]

Enable image backends on macOS because we have terminals with graphics support on macOS.

mlterm supports sixel:

kitty:

NOTE: iTerm2 also supports sixel but it shows broken output (I think it is a iTerm2 issue):

[o2sh]

Enable image backends on macOS because we have terminals with graphics support on macOS.

Great! I don't have a machine running macOS so I couldn't test it for myself.

Your PR looks good. What would you think about replacing #[cfg(not(target_os = "windows"))] with #[cfg(not(windows))] ?

iTerm2 also supports sixel but it shows broken output

Yes, that's weird. Have you tried onefetch -i /path/to/image --image-backend sixel

[yoichi]

Your PR looks good. What would you think about replacing #[cfg(not(target_os = "windows"))] with #[cfg(not(windows))] ?

Applied in 0cf7398.

iTerm2 also supports sixel but it shows broken output

Yes, that's weird. Have you tried onefetch -i /path/to/image --image-backend sixel

I've already tried. It is not a problem of image backend selection.

[yoichi]

FYI: I've reported a issue on iTerm2 https://gitlab.com/gnachman/iterm2/-/issues/9204, which causes the broken output