Few tricks for the GVIM diff mode

Couple of useful tricks for the GVIM diff mode (~/.gvimrc):

- Equalize the diff file window sizes when resizing the GVIM window. That is probably applicable to console vim too, but I generally diff with the GUI vim. (The "Trailing characters" error from :exec occasionally drives me up the wall. But I have finally found out how to properly trigger keyboard shortcut!)

- Toggle font size very very small/very small and small on F5 (font names below are for *nix).

The Doom1-styled toggles I wanted to try already for a long time. In VIM the need for toggles isn't that high since the boolean parameters can be already toggled (:set hls! or :set wrap! for example). I found no other (readable) way to implement them but with functions - one function per state of toggle. A function which is part part of the toggle group does two things: first it sets parameter(s) it needs to set, then it map the toggle shortcut to the next function in the toggle group. To "initialize" the toggle group, simply call one of the functions.


if &diff
        " equalize size of diffed file windows
        au VimResized * :execute "normal! \<C-W>="

        " toggle diff font
        function! DiffSmallFont1()
                set guifont=-misc-fixed-medium-r-normal--9-90-75-75-c-60-iso10646-1
                map :call DiffSmallFont2()<CR>
        endfunction
        function! DiffSmallFont2()
                set guifont=-misc-fixed-medium-r-normal--10-100-75-75-c-60-iso10646-1
                map <F5> :call DiffSmallFont3()<CR>
        endfunction
        function! DiffSmallFont3()
                set guifont=-misc-fixed-medium-r-normal--13-120-75-75-c-70-iso10646-1
                map <F5> :call DiffSmallFont1()<CR>
        endfunction
        call DiffSmallFont2()
endif