Sorting files by their extension

Sorting files by their extension

[Jean-Rene David]

Has anyone got a ready-made way to do this?

% print -l *
bar.a
bar.b
foo.a
foo.b

% print -l *(o<insert special qualifier here>)
bar.a
foo.a
bar.b
foo.b

It looks like tricky business to me, but perhaps
someone already thought this through.

-- 
JR

Re: Sorting files by their extension

[Mikael Magnusson]

On 8/14/06, Jean-Rene David <jrdavid@magma.ca> wrote:
> Has anyone got a ready-made way to do this?
>
> % print -l *
> bar.a
> bar.b
> foo.a
> foo.b
>
> % print -l *(o<insert special qualifier here>)
> bar.a
> foo.a
> bar.b
> foo.b
>
> It looks like tricky business to me, but perhaps
> someone already thought this through.

I don't exactly know the answer to your question, but in the meantime
maybe `ls -X` can help.

-- 
Mikael Magnusson

Re: Sorting files by their extension

[Bart Schaefer]

On Aug 14,  5:40pm, Jean-Rene David wrote:
} Subject: Sorting files by their extension
}
} Has anyone got a ready-made way to do this?

It's pretty much impossible to do as a glob qualifier, because sorting is
the very last thing to happen, after all the other qualifiers are done.
You can play games if you don't need the actual file name, or by first
assigning to an array variable and then manipulating the array, but with
only filename generation you're out of luck.

  x=( *(e%'reply=( $REPLY:e/$REPLY )'%) )
  print -l $x:t

Aside to PWS:  It appears that as a side-effect of the *(+func) syntax,
it is no longer possible to use "+" as the delimiter in *(e+'stmt'+).
This should at least be documented.

Re: Sorting files by their extension

[Peter Stephenson]

Bart Schaefer wrote:
> Aside to PWS:  It appears that as a side-effect of the *(+func) syntax,
> it is no longer possible to use "+" as the delimiter in *(e+'stmt'+).
> This should at least be documented.

Are you sure?  It's parsed left to right and it's supposed to look for
the delimiters for the "e" before even thinking about the next
qualifier---given that pretty much anything can occur in the middle
that's about the only way it could work.  I can do this:

% echo g*
glob.c glob.epro glob.o glob.pro glob.syms

% echo g*(e:'reply=(${REPLY[2,-1]}${REPLY[1]}ay)':)
lob.cgay lob.eprogay lob.ogay lob.progay lob.symsgay
% echo g*(e+'reply=(${REPLY[2,-1]}${REPLY[1]}ay)'+)
lob.cgay lob.eprogay lob.ogay lob.progay lob.symsgay

% trangefysay() { reply=(${REPLY[2,-1]}${REPLY[1]}ay) }
% echo g*(e+'trangefysay'+)
lob.cgay lob.eprogay lob.ogay lob.progay lob.symsgay
% echo g*(+trangefysay)
lob.cgay lob.eprogay lob.ogay lob.progay lob.symsgay

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070


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