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Final demise of alias stack



Here's the pay off after yesterday's bugfix for aliases.  It should
make the system a lot smoother and easier to understand.  It requires
yesterday's patch to be applied first.

1) The alias stack (alstack) has bitten the dust.  Instead of the
three stacks (input, alias, popped alias) there is now just the input
stack.  This removes the arbitrary limit MAXAL (was 20) on alias
expansions.  (That never did you any good, it just failed silently
when it got to the limit.)  Because the input stack is the alias
stack, popping of aliases is now coincident with popping of the input
stack instead of being an afterthought (last week's inpopalias()).
The alias is passed as an additional argument to inpush().  Use of
alstackind to test whether expanding an alias is replaced by
(inbufflags & INP_ALIAS).  inbufflags is now global.

2) The alstat variable is also absorbed into inbufflags:  not
necessary, but seems natural in view of the above.

3) I suppose the following (wrong) behaviour has been around for some
time:

% alias foo='echo foo1 '
% foo foo bar foo
foo1 echo foo1 bar echo foo1

This is correct up to the final `echo foo1' which should have stayed as
`foo' because there was a `bar' between the space-terminated alias and
the next alias.  I have corrected this.  The expand-next-alias
behaviour is now reset in exalias(), which seems as good a place as
any.

(Note that this mechanism only expands one level of aliases:  if the
resulting alias is itself an alias it will not be expanded.  I have
kept this, but is it a bug?)

4) Also, history expansion is marked specially on the input stack.
This makes the tests in hist.c (formally (inalstack == 1 &&
!alstack[0]), now (inbufflags & INP_HIST)) simpler and more obvious.

5) I think I've incidentally fixed the following bug:

% setopt histverify
% echo \!\!
!!
% echo !:1
% echo !\!

(the first ! should be quoted, too.)  This is the hunk with hwbegin()
in hist.c.  Zoltan, is this right?

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`
end

-- 
Peter Stephenson <pws@xxxxxx>       Tel: +49 33762 77366
WWW:  http://www.ifh.de/~pws/       Fax: +49 33762 77413
Deutches Electronen-Synchrotron --- Institut fuer Hochenergiephysik Zeuthen
DESY-IfH, 15735 Zeuthen, Germany.



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