This might be quite challenging, but I would like to achieve the following behavior. Imagine that I have two mappings that overlap:

  • dcb := delete comment block := delete comment block (all adjacent comment lines)
  • dcl := delete comment line := delete comment line

if I type in normal mode 'dc' and the timeout expires, I would like to provide help showing the different options. I have all the mappings documented so it would be easy to write a program that filters out what the verb is and what the text object is, but as I'm not very experienced with vimscript the challenging part for me is:

  • Triggering the function when timeoutlen expires
  • Retrieving the input command:
    • If I could get that the user input was 'dc' then I easy parse my documentation and provide the information.

Less challenging (still challenging for me but definitely possible as this is very common in many plugins:

  • Presenting the different options to the user and letting them choose
  • Executing the final command

Any ideas or guidance on how to achieve this would be very much appreciated.


1 Answer 1


Create map for dc, if you type in only dc, it will be triggered after timeoutlen ms.

nnoremap dcb :echo "dcb"<cr>
nnoremap dcl :echo "dcl"<cr>
nnoremap dc :call <sid>suggest('dc')<cr>

function! s:suggest(cmd)
  " get second column of `map dc`
  let l = map(split(execute('map ' . a:cmd), "\n"), {i,v->split(v)[1]})
  echo 'possible commands : ' . join(l[1:], " ")
  • This is very specific, it would only work with 'dc'. I'm looking for a solution that works for all my mapings
    – Blasco
    Commented Oct 10, 2019 at 11:46
  • 1
    suggest accept a command prefix, you can use other prefix for other commands. e.g. nnoremap dx :call <sid>suggest('dx')<cr> suggest for all commands starts with dx.
    – dedowsdi
    Commented Oct 10, 2019 at 11:58

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