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Subject:	Re: How to expand tabs? Where is expand program.
From:	Warren Young <wyml AT etr-usa DOT com>
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Date:	Thu, 2 Jul 2015 18:55:54 -0600
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On Jul 2, 2015, at 6:46 PM, Warren Young <wyml AT etr-usa DOT com> wrote:
> 
> Say :set expandtab.  Now you don’t need expand(1) at all. :)

Ooops, Ernie’s answer made me look deeper, and it’s a bit more complicated.  I forget because I’ve wrapped it up into a couple of macros which I keep in my ~/.vimrc file:

function SpaceTabs(spaces)
    exe "set sw=" . a:spaces
    exe "set ts=" . a:spaces
    exe "set expandtab"
    exe "set smarttab"
    exe "retab"
endfunction

function TabTabs(stops)
    exe "set ts=" . a:stops
    exe "set sw=" . a:stops
    exe "set noexpandtab"
    exe "set nosmarttab”
endfunction

So, “:call SpaceTabs(4)” is roughly equivalent to “expand -t4 < old > new”, except it works in-place.
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