Ctrl-Xの補完，マーク位置，レジスタ内容のヒントを表示するキーマッピング

showhint.vim

if &compatible
  set nocompatible
endif


function! s:hint_n_m() abort " {{{
  redir => str
    :marks
  redir END
  echo str
  return 'm' . nr2char(getchar())
endfunction " }}}
nnoremap <expr> m  <SID>hint_n_m()


function! s:hint_n_quote() abort " {{{
  redir => str
    :marks
  redir END
  echo str
  return '`' . nr2char(getchar())
endfunction " }}}
nnoremap <expr> `  <SID>hint_n_quote()
nnoremap <expr> '  <SID>hint_n_quote()


function! s:hint_n_doublequote() abort " {{{
  redir => str
    :registers
  redir END
  echo str
  return '"' . nr2char(getchar())
endfunction " }}}
nnoremap <expr> "  <SID>hint_n_doublequote()


let s:compl_key_dict = {
      \ char2nr("\<C-l>"): "\<C-x>\<C-l>",
      \ char2nr("\<C-n>"): "\<C-x>\<C-n>",
      \ char2nr("\<C-p>"): "\<C-x>\<C-p>",
      \ char2nr("\<C-k>"): "\<C-x>\<C-k>",
      \ char2nr("\<C-t>"): "\<C-x>\<C-t>",
      \ char2nr("\<C-i>"): "\<C-x>\<C-i>",
      \ char2nr("\<C-]>"): "\<C-x>\<C-]>",
      \ char2nr("\<C-f>"): "\<C-x>\<C-f>",
      \ char2nr("\<C-d>"): "\<C-x>\<C-d>",
      \ char2nr("\<C-v>"): "\<C-x>\<C-v>",
      \ char2nr("\<C-u>"): "\<C-x>\<C-u>",
      \ char2nr("\<C-o>"): "\<C-x>\<C-o>",
      \ char2nr('s'): "\<C-x>s",
      \ char2nr("\<C-s>"): "\<C-x>s"
      \}
let s:hint_i_ctrl_x_msg = join([
      \ '<C-l>: While lines',
      \ '<C-n>: keywords in the current file',
      \ "<C-k>: keywords in 'dictionary'",
      \ "<C-t>: keywords in 'thesaurus'",
      \ '<C-i>: keywords in the current and included files',
      \ '<C-]>: tags',
      \ '<C-f>: file names',
      \ '<C-d>: definitions or macros',
      \ '<C-v>: Vim command-line',
      \ "<C-u>: User defined completion ('completefunc')",
      \ "<C-o>: omni completion ('omnifunc')",
      \ "s: Spelling suggestions ('spell')"
      \], "\n")
function! s:hint_i_ctrl_x() abort " {{{
  echo s:hint_i_ctrl_x_msg
  let c = getchar()
  return get(s:compl_key_dict, c, nr2char(c))
endfunction " }}}
inoremap <expr> <C-x>  <SID>hint_i_ctrl_x()