Have pre-existing C files use 8 spaces indents (to match old PEP 7 style), but
have all new files use 4 spaces (to match current PEP 7 style).
diff --git a/Misc/Vim/vimrc b/Misc/Vim/vimrc
index 0df3bd9..b178266 100644
--- a/Misc/Vim/vimrc
+++ b/Misc/Vim/vimrc
@@ -19,9 +19,10 @@
" Number of spaces to use for an indent.
" This will affect Ctrl-T and 'autoindent'.
" Python: 4 spaces
-" C: 4 spaces
+" C: 8 spaces (pre-existing files) or 4 spaces (new files)
au BufRead,BufNewFile *.py,*pyw set shiftwidth=4
-au BufRead,BufNewFile *.c,*.h set shiftwidth=4
+au BufRead *.c,*.h set shiftwidth=8
+au BufNewFile *.c,*.h set shiftwidth=4
" Number of spaces that a pre-existing tab is equal to.
" For the amount of space used for a new tab use shiftwidth.