# Use a smaller font for vimdiff

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created November 19, 2004 · complexity basic · author Pan Shizhu · version 6.0

I want to change the font when Vim is launched in vimdiff mode, since you'll not be able to change the font later while retaining the 1:1 split, (in other cases, I can change the font before :diffs).

Just add something like the following in gvimrc. Of course, your fonts may vary.

```" Font must be set in gvimrc
let in_diff_mode = 0
windo let in_diff_mode = in_diff_mode + &l:diff
set guifont=Lucida_Console:h15:cDEFAULT
" In diff mode
if in_diff_mode == 1
set guifont=isi_ansi:h14:cDEFAULT
endif
unlet in_diff_mode
```

```"Here are some settings for diff mode, the colors are troublesome.
if &diff
set diffopt=filler,iwhite,icase,context:6
":windo! set wrap
" hi diffchange ctermbg=0 .. is black on unix
hi diffchange term=NONE ctermbg=3 ctermfg=5
hi diffdelete term=NONE ctermbg=0
if \$TERM =~ "xterm"
hi diffchange ctermbg=8 ctermfg=1
hi difftext ctermbg=8 ctermfg=7
endif
endif
```

Is there any reason not to test for the value of &l:diff directly? In my gvimrc the following lines seem to work:

```if &l:diff
set guifont=Monaco:h9
else
set guifont=Monaco:h11
endif
```

I have been looking for information on how to set the font size to much larger on a MacOSX installation of Vim.app.

This worked finally:

set guifont=Monaco:h18