For me I think the following is the case:
$VIMRUNTIME='C:/Program Files (x86)/Vim/vim73'
But if I look in the pc's environment variables (via Computer>Properties etc) I cannot see this path - should I add it manually?
_vimrc
currently looks like the following:
set nocompatible
source $VIMRUNTIME/vimrc_example.vim
source $VIMRUNTIME/mswin.vim
behave mswin
set diffexpr=MyDiff()
" Use CTRL-S for saving, also in Insert mode
:nnoremap <C-S> :<C-U>update<CR>
:vnoremap <C-S> :<C-U>update<CR>gv
:cnoremap <C-S> <C-C>:update<CR>
:inoremap <C-S> <C-O>:update<CR>
function MyDiff()
let opt = '-a --binary '
if &diffopt =~ 'icase' | let opt = opt . '-i ' | endif
if &diffopt =~ 'iwhite' | let opt = opt . '-b ' | endif
let arg1 = v:fname_in
if arg1 =~ ' ' | let arg1 = '"' . arg1 . '"' | endif
let arg2 = v:fname_new
if arg2 =~ ' ' | let arg2 = '"' . arg2 . '"' | endif
let arg3 = v:fname_out
if arg3 =~ ' ' | let arg3 = '"' . arg3 . '"' | endif
let eq = ''
if $VIMRUNTIME =~ ' '
if &sh =~ '\<cmd'
let cmd = '""' . $VIMRUNTIME . '\diff"'
let eq = '"'
else
let cmd = substitute($VIMRUNTIME, ' ', '" ', '') . '\diff"'
endif
else
let cmd = $VIMRUNTIME . '\diff'
endif
silent execute '!' . cmd . ' ' . opt . arg1 . ' ' . arg2 . ' > ' . arg3 . eq
endfunction
No. $VIMRUNTIME
is a special environment variable that automatically gets set by Vim.
:help $VIMRUNTIME
would have already told you this:
You don't normally set $VIMRUNTIME yourself, but let Vim figure it out.
Learn how the excellent and comprehensive :help
is structured; all the information is in there (you just need to know how to find it)!