How can I execute the current line as Vim EX commands?

Question

Say I\'m editing my _vimrc file and I\'ve just added a couple of lines, for instance a new key mapping. I don\'t want to reload the whole file (:so %

Answer 1

If you're doing a lot of experimenting (trying things out that you might want to add to your vimrc, I assume?) it might help to do so in a scratch file like experimental.vim so you aren't just relying on your history to know what you're trying out. Now that you have these great mappings, it will be easy to rerun things from experimental or vimrc without sourcing the whole file.

Also (sorry, I can't comment on answers yet, it seems), I tried this mapping of Peter's:

vnoremap <Leader>es :<c-u>exec join(getline("'<","'>"),'<BAR>')<CR>

This works in most cases, but it fails specifically on function definitions.

function! TestMe()
  echo "Yay!"
endfunction

This mapping joins the lines into a single string, separated by <BAR> and then execs them.

I'm not entirely sure why, but if I try to do that with a function definition in normal mode:

:exec 'function! TestMe()|  echo "Yay!"|endfunction'
-> E488: Trailing characters

After some testing, I've found that it will work with newline separators instead:

:exec "function! TestMe()\n  echo 'Yay!'\nendfunction"
:call TestMe()
-> Yay!

So, I've changed my mapping to this:

vnoremap <Leader>es :<c-u>exec join(getline("'<","'>"),"\n")<CR>

I suppose there is a vim or ex reason why the <BAR> method doesn't work on functions (maybe even some setting I have on?), and I'm curious to hear what it is if someone knows.

Answer 2

For that purpose, I have defined the following commands and mappings:

":[range]Execute    Execute text lines as ex commands.
"                   Handles |line-continuation|.
" The same can be achieved via "zyy@z (or yy@" through the unnamed register);
" but there, the ex command must be preceded by a colon (i.e. :ex)
command! -bar -range Execute silent <line1>,<line2>yank z | let @z = substitute(@z, '\n\s*\\', '', 'g') | @z

" [count]<Leader>e  Execute current [count] line(s) as ex commands, then
" {Visual}<Leader>e jump to the following line (to allow speedy sequential
"                   execution of multiple lines).
nnoremap <silent> <Leader>e :Execute<Bar>execute 'normal! ' . v:count1 . 'j'<CR>
xnoremap <silent> <Leader>e :Execute<Bar>execute 'normal! ' . v:count1 . 'j'<CR>