Whether more editor options can be provided

[alongnice]

When I try to edit a file, I use Vim by default. But the editor I'm more familiar with is Emacs, vim is very unfamiliar, but can't find the configuration parameters to switch. If you can ask the author to add this function, I wish Gitui can do better and better.

[kosayoda]

The relevant source code is https://github.com/extrawurst/gitui/blob/006cdd63738db91e6c3074439bfd561eb0b5eb9c/src/components/externaleditor.rs#L72-L81

You have 4 options to set the editor used in gitui:

1. Set the GIT_EDITOR environment variable
2. Set the VISUAL environment variable
3. Set the EDITOR environment variable
4. Set the editor used by Git in your Git Configuration

[stale[bot]]

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