function! s:AddParameter()
  let name = input("parameter name: ")
  let cursor_position = getpos(".")

  if empty(matchstr(getline("."), '\<def\>'))
    exec "?\\<def\\>"
  endif

  let closing_bracket_index = stridx(getline("."), "(")
  if closing_bracket_index == -1
    execute "normal A()\<Esc>"
  endif
  exec ':s/)/, ' . name . ')/'
  exec ':silent! %s/(, /(/'

  call setpos(".", cursor_position)
endfunction

function! s:InlineTemp()
  let cursor_position = getpos(".")
  normal "ayiw
  normal $"byiW
  normal dd
  exec ":.,/end/ s/\\<" . @a . "\\>/" . @b . "/gI"
  call setpos(".", cursor_position)
endfunction

function! s:ExtractLet()
  let cursor_position = getpos(".")
  normal 0
  normal! dd
  exec "?^\\s*\\<\\(describe\\|context\\|let\\)\\>"
  normal! $p
  exec 's/\v([a-z_][a-zA-Z0-9_]*) \= (.+)/let(:\1) { \2 }'
  normal V=
  call setpos(".", cursor_position)
  normal jw
endfunction

function! s:RenameVariable()
  let cursor_position = getpos(".")
  let name = input("new name: ")
  normal "ayiw
  exec ":.,/end/ s/\\<" . @a . "\\>/" . name . "/gI"
  call setpos(".", cursor_position)
endfunction

command! RAddParameter call s:AddParameter()
command! RInlineTemp call s:InlineTemp()
command! RExtractLet call s:ExtractLet()
command! RRenameVariable call s:RenameVariable()

" run rspec test
nnoremap <leader>run :!rspec %<cr>
nnoremap <leader>t :VroomRunNearestTest<cr>
nnoremap <leader>ta :VroomRunTestFile<cr>

" ruby refactorings
nnoremap <leader>rap :RAddParameter<cr>
nnoremap <leader>rit :RInlineTemp<cr>
nnoremap <leader>rel :RExtractLet<cr>
nnoremap <leader>rrlv :RRenameVariable<cr>

" \c comment out line.
nnoremap <buffer> <localleader>c I# <esc>