togge_ruby_blocks.vim

" Toggle ruby blocks
" requires the matchit plugin
function! s:ToggleRubyBlocks()
  let c = getline(".")[col(".")-1]
  if c =~ '[{}]'
    " don't use matchit for {,}
    exe 'normal! %s'.(c=='}' ? 'do' : 'end')."\<esc>``s".(c=='}' ? 'end' : 'do')."\<esc>"
  else
    let w = expand('<cword>')
    if w == 'do'
      " use matchit
      normal %
      exe "normal! ciw}\<esc>``ciw{\<esc>"
    elseif w == 'end'
      " use matchit
      normal %
      exe "normal! ciw{\<esc>``ciw}\<esc>"
    else
      throw 'Cannot toggle block: cursor is not on {, }, do, nor end'
    endif
  endif
endfunction
autocmd! BufReadPost *.rb,*.erb :nnoremap <buffer> <leader>b :call <sid>ToggleRubyBlocks()<cr>