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List:       vim
Subject:    Re: Smart tab key
From:       Didier Bretin <dbr () informactis ! com>
Date:       2003-03-24 13:47:47
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Hi Shaun,

On Sat, 22 Mar 2003 15:10:47 -0800
Shaun Jackman <sjackman@shaw.ca> wrote:

SJ> In insert mode, I would like the tab key to function as follows:
SJ> 
SJ> If cursor is at the beginning of a line,
SJ> ie only white space characters to the left
SJ> 	tab inserts a tab character.
SJ> If in the middle of a line,
SJ> ie any non-white space character on the left
SJ> 	tab acts as <c-p>
SJ> 
SJ> I'm sure this is a simple insert-mode macro, but my vim hacking 
SJ> skills are weak. <frown> Can anybody suggest a couple quick lines to 
SJ> accomplish this?

Me I use this on my .vimrc file and it works very well:

function InsertTabWrapper()
      let col = col('.') - 1
      if !col || getline('.')[col - 1] !~ '\k'
          return "\<tab>"
      else
          return "\<c-p>"
      endif
endfunction

inoremap <tab> <c-r>=InsertTabWrapper()<cr>

Regards.
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