Two useful text objects for coffeescript

indent.vim

" See http://andrewradev.com/2012/04/03/manipulating-coffeescript-with-vim-part-1-text-objects/
" for details on the implementation

onoremap ii :<c-u>call <SID>IndentTextObject()<cr>
onoremap аi :<c-u>call <SID>IndentTextObject()<cr>
xnoremap ii :<c-u>call <SID>IndentTextObject()<cr>
xnoremap ai :<c-u>call <SID>IndentTextObject()<cr>
function! s:IndentTextObject()
  let upper = s:UpperIndentLimit(line('.'))
  let lower = s:LowerIndentLimit(line('.'))
  call s:MarkVisual('V', upper, lower)
endfunction

onoremap if :<c-u>call <SID>FunctionTextObject('i')<cr>
onoremap af :<c-u>call <SID>FunctionTextObject('a')<cr>
xnoremap if :<c-u>call <SID>FunctionTextObject('i')<cr>
xnoremap af :<c-u>call <SID>FunctionTextObject('a')<cr>
function! s:FunctionTextObject(type)
  let function_start = search('\((.\{-})\)\=\s*[-=]>$', 'Wbc')
  if function_start <= 0
    return
  endif

  let body_start = function_start + 1
  if body_start > line('$') || indent(nextnonblank(body_start)) <= indent(function_start)
    if a:type == 'a'
      normal! vg_
    endif

    return
  endif

  let indent_limit = s:LowerIndentLimit(body_start)

  if a:type == 'i'
    let start = body_start
  else
    let start = function_start
  endif

  call s:MarkVisual('v', start, indent_limit)
endfunction

function! s:LowerIndentLimit(lineno)
  let base_indent  = indent(a:lineno)
  let current_line = a:lineno
  let next_line    = nextnonblank(current_line + 1)

  while current_line < line('$') && indent(next_line) >= base_indent
    let current_line = next_line
    let next_line    = nextnonblank(current_line + 1)
  endwhile

  return current_line
endfunction

function! s:UpperIndentLimit(lineno)
  let base_indent  = indent(a:lineno)
  let current_line = a:lineno
  let prev_line    = prevnonblank(current_line - 1)

  while current_line > 0 && indent(prev_line) >= base_indent
    let current_line = prev_line
    let prev_line    = prevnonblank(current_line - 1)
  endwhile

  return current_line
endfunction

function! s:MarkVisual(command, start_line, end_line)
  if a:start_line != line('.')
    exe a:start_line
  endif

  if a:end_line > a:start_line
    exe 'normal! '.a:command.(a:end_line - a:start_line).'jg_'
  else
    exe 'normal! '.a:command.'g_'
  endif
endfunction

Nice work. Are you familiar with https://github.com/kana/vim-textobj-indent ? Unless I'm missing something that plugin solves the same problem.

To me, the interesting thing about the gist is the implementation -- it's fairly simple to build something useful like this on your own (it's a part of a blog post, where I explain it in a lot more detail). For an actual, battle-tested indent text object, I'm pretty sure Kana's plugin works better :). The function object is something a bit different that might be useful, though.

Thanks for the explanation. I'll go reading the blog post ;)