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Here, I'm using a mapping from this post. Edited it to my liking like so:

nnoremap <F3> :execute 'help' expand('<cWORD>')<CR>

that works. Problem is, i wanted to add | only so that the help window become the only visible opened window. I tried this in Ex mode:

:execute "h "expand("<cWORD>")"| only"

This works as intended.

Now when i try to do it in a mapping:

nnoremap <F3> :execute "h "expand("<cWORD>")"| only"<CR>

Doesn't seem to work.

I think it might be due to the position of the quotes, but after some experiments, i couldn't fix it myself.

How come the mapping doesn't work, when the Ex command does?

2

:help sees | as its argument, so I suggest to write a simple function.

function! s:search_help(str)
  exec 'help '.a:str
  only
endfunction
nnoremap <F3> :call <SID>search_help(expand('<cword>'))<CR>

As pointed in comment, when using :map command | should be <bar> (:h key-notation), so there is an one-line solution:

nnoremap <F3> :exec 'h '.expand('<cword>').' <bar> only'<CR>
3
  • didn't know :O. Thanks! Nov 5 '20 at 16:45
  • 5
    You can write only instead of execute 'only'; this is true for all ex-commands (you only need execute when doing string interpolation into the command, and to protect certain things like | from being arguments to commands)
    – D. Ben Knoble
    Nov 5 '20 at 16:58
  • 5
    Note also that | in mappings should be <bar>, a common point of confusion
    – D. Ben Knoble
    Nov 5 '20 at 16:59

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