a Vim script to insert spaces around punctuations and equals automatically

sape.vim

"""" Spaces Around Punctuations and Equals """"

let s:sape_no_space_before_equal = split('-!~=+*/&|<>%', '\zs')
let s:sape_followed_by_space = split(',;=', '\zs')

function s:sape(c)
    if a:c == ' ' || a:c == '\t' || col(".") == 1
	return a:c
    endif
    let prevchar = getline(".")[col(".") - 2]
    if prevchar == ' ' || prevchar == '\t'
	return a:c
    endif

    if a:c == "="
	if index(s:sape_no_space_before_equal, prevchar) == -1
	    return " ="
	else
	    return "="
	endif
    endif

    if index(s:sape_followed_by_space, prevchar) == -1
	return a:c
    else
	return "\<space>" . a:c
    endif
endfunction

" autocmd InsertCharPre *.{c,cpp,cc,h} let v:char = s:sape(v:char)

" eof