Hi,

I use Vim as a editor when editing config files and writing code. Sometimes I find a old buffer ( from yesterday maybe ) and wonder what the differences between it and the current file. I would like open a separate window with the current file on disk to the right of my current window and highlight the differences in red.

I tried to do this with the following line in .vimrc:

nnoremap <expr> <F3> indiff ? ':q<cr><C-w>j:diffoff<cr>:let indiff=0<cr>' : ':vs %<cr>:diffthis<cr><C-w>l :diffthis<cr>:let indiff=1<cr>'

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It does open the file in diff mode but it is not the file on disk. Instead it is exactly the same as my current buffer. What would be the best way to do this?

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Thanks