Question

I used to remember that we can add some vim cmd line in the file’s head, and they will be executed when vim open the file.
I tried to add head line like this:

#vim map <F4> :close<CR>

But it did not work.

Answer 1

You can’t add vim cmd line at the file head. If you have

set modeline modelines=N

where N>0 then lines like

vim: tw=40

at the start/end of the file (not more then N lines from the start/end) will set option tw (textwidth) to 40. You can write it in a fuller form:

vim: set textwidth=40

, but it still accepting only options (set here is just ignored). It does not even accept all options (some of them are stated in the doc as “cannot be set from a modeline … for security reasons”). Without plugins you can’t have generic command here. Note that if you find one that allows running :map command I will suggest not using it: it is very unsecure. I’ve seen only those that allow doing :let in modelines.

By the way,

1. why not put it into vimrc?
2. :close command can be typed as <C-w>c in close mode which is much faster then moving hands to <F4>.
3. Don’t use map without nore for no reason. Plain map makes you think “what will the new mapping I add break” before adding it. *noremap will make all mappings immune to breaking by any other mapping with different {lhs}.