Capture error in omni completion, and switch to key completation

Hi, I'm writing a simple function to perform "smart" completions with LaTeX. I would like to use the <tab> key to perform omni completion by default, but if it produces no output, then it should try key completion (I use a dictionary with LaTeX keywords).

Is there a way to produce this flow? Currently, when completion can't find a match, I get the message "Pattern not found". Is there a way to say vim "when you find no pattern in omni completion, return <c-p>"?

Thanks a lot. 

For further details, I attach the current state of my function:

function! Smart_TabComplete_Tex()

  " if the pop-up window is shown, go down

  if(pumvisible())

    return "\<down>"

  endif

  " get the line to guess what the user wants

  let line = getline('.')

  " if the line is empty, return \ followed by omni completion

  if(match(line, '\S')==-1)

    noh

    return "\\\<c-x>\<c-o>"

  endif

  " find the last word in the line

  let lastword = matchstr(line, '\S*$')

  " if the last word contains some LaTeX-like character, omni completion

  if(match(lastword,'[\{}]') != -1) 

    noh

    return "\<c-x>\<c-o>"

  endif

  " if the last word seems like a folder, file completion

  if(match(lastword,'[/]') != -1)

    noh

    return "\<c-x>\<c-f>"

  endif

  " if nothing else works, key completion

  noh

  return "\<c-p>"

endfunction

--

Juan José Gómez-Navarro

University of Bern
Physics Institute
Sidlerstrasse 5
CH-3012 Bern
Switzerland

+41 31 631 4871 

http://www.climate.unibe.ch/~gomez/

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