How to set colorscheme of vimdiff using .vimrc

Question

I want to set colorscheme during vimdiff at startup. Note this colorscheme would be different than Vim's colorscheme.

Answer 1

You can use an auto command to achieve this:

augroup VimDiff
    autocmd!
    autocmd VimEnter,FilterWritePre * if &diff | colorscheme default | endif
augroup END

I found FileWritePre in the thread Diff mode only mappings. This event allows you to enable specific settings after Vim started and when diff mode is set, with :diffthis for example.

If you want to check only once (for vim -d), VimEnter is enough but you should get rid of the auto command altogether (as Christian pointed out):

if &diff
    " setup for diff mode
else
    " setup for non-diff mode
endif

Read :h diff for more details.