[Vim-latex-devel] Feature request: find current environment

[Alan S. <ala...@po...>]

Hi,

It would be very useful to be able to know what the current environment=20
is, for instance to insert a closing tag, or to have a more precise=20
behavior of the Tex_InsertItem() function (right now it guesses the=20
environment according to the "begin" that occurs before, but it might=20
guess wrong:

      \begin{itemize}
        \item ...
        \item ...
          \begin{description}
            \item[Static] ...
            \item[Dynamic] ...
          \end{description}
        % HERE it thinks it is in a description, and alt-i insert the=20
        % wrong \item
      \end{itemize}
)

Such a thing could reuse matchit, which is already able to match begin=20
and end environments. Or we could rewrite it from scratch (a simple=20
implementation that does not try to check whether the environments are=20
correctly opened and closed is:

function! Tex_GetCurrentEnv()
  " WARNING: this modifies the cursor position
  let i =3D 0
  while 1
    let env_line =3D search('^[^%]*\\\%(begin\|end\){', 'bW')
    if env_line =3D=3D 0
      " we reached the beginning of the file, so we return the empty string
      return ''
    endif
    if match(getline(env_line), '^[^%]*\\begin{') =3D=3D -1
      " we found a \\end, so we keep searching
      let i =3D i + 1
      continue
    else
      " we found a \\begin
      if i =3D=3D 0
	"this is the one we want
	let env =3D matchstr(getline(env_line), '\\begin{\zs.\{-}\ze}')
	return env
      else
	" this begin closes a \\end
	let i =3D i - 1
	continue
      endif
    endif
  endwhile
endfunction

function! Tex_InsertItem()
    " Get current enclosing environment
    let pos =3D line('.').' | normal! '.virtcol('.').'|'
    let env =3D Tex_GetCurrentEnv()
    exe pos

    if exists('g:Tex_ItemStyle_'.env)
      return IMAP_PutTextWithMovement(g:Tex_ItemStyle_{env})
    else
      return ''
    endif
endfunction
)

Alan Schmitt

--=20
The hacker: someone who figured things out and made something cool happen.
=2EO.
=2E.O
OOO