var expansion in glob pattern?

var expansion in glob pattern?

[Sven Guckes]

Most of my mail folders are small -
usually just questions and
answers about some program.

so I tried to run a quick statistics
on my Mail directory using the zsh
and its file globbing by size:

  $ cd ~/Mail
  $ for i in 1 2 3 4 5 10 15 20 25 30 35 40 35 40 45 50; do
      ls *(.Lk-$i)|wc -l
    end
  zsh: parse error near `end'

as you can see, it failed.
i suppose there is no variable
substitution inside globbing brackets.
but I'm sure there must be a way.
any hints?

Sven

Re: var expansion in glob pattern?

[Bart Schaefer]

On Mar 23,  7:56pm, Sven Guckes wrote:
} Subject: var expansion in glob pattern?
}
}   $ for i in 1 2 3 4 5 10 15 20 25 30 35 40 35 40 45 50; do
}       ls *(.Lk-$i)|wc -l
}     end
}   zsh: parse error near `end'

You need "done" rather than "end", there.  There's nothing wrong with
the glob expression -- except that passing it as the argument to "ls"
may do the wrong thing when there are no matches at all.

Of course note that the files smaller than 50k includes all the files
smaller than 45k, and so on ... so I'd try:

    j=0
    for i in 1 2 3 4 5 10 15 20 25 30 35 40 35 40 45 50; do
      print ${(l:3:)i}k : "${#${(f)$(print -l *(N.Lk-${i}Lk+${j}))}}"
      ((j=i-1))
    done
    print Rest : "${#${(f)$(print -l *(N.Lk+${j}))}}"

Detailed explanation available upon request.

-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com

Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net   

Re: var expansion in glob pattern?

[Bart Schaefer]

On Mar 23,  7:36pm, Bart Schaefer wrote:
}
} except that passing [the glob expression] as the argument to "ls"
} may do the wrong thing when there are no matches at all.

Hmm, just noticed that my solution is also off when there are no matches,
because "${#${(f)...}}" didn't behave the way I expected on empty string
(returns 1 rather than 0).  So really:

    j=0
    for i in 1 2 3 4 5 10 15 20 25 30 35 40 35 40 45 50; do
      print ${(l:3:)i}k : "$[${#${(f)$(print -l x *(N.Lk-${i}Lk+${j}))}}-1]"
      ((j=i-1))
    done
    print Rest : "$[${#${(f)$(print -l x *(N.Lk+${j}))}}-1]"

-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com

Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net   

Re: var expansion in glob pattern? - s/end/done/ !

[Sven Guckes]

* Bart Schaefer <schaefer@brasslantern.com> [2002-03-23 19:36]:
> On Mar 23,  7:56pm, Sven Guckes wrote:
> }   $ for i in 1 2 3 4 5 10 15 20 25 30 35 40 35 40 45 50; do
> }       ls *(.Lk-$i)|wc -l
> }     end
> }   zsh: parse error near `end'
> 
> You need "done" rather than "end", there.

  $ for i in 1 2 3 4 5 10 15 20 25 30 35 40 35 40 45 50; do
      ls *(.Lk-$i)|wc -l
   done
      9
    211
    642
   1298
   2015
   3331
   3882
   4188
   4365
   4493
   4595
   4670
   4595
   4670
   4716
   4757

now it works!  :-)

> There's nothing wrong with the glob expression --
> except that passing it as the argument to "ls" may do
> the wrong thing when there are no matches at all.

good point!

> Of course note that the files smaller than 50k
> includes all the files smaller than 45k, and so on ...

yep, that's a feature. :-)

Sven

Re: var expansion in glob pattern?

[Sven Guckes]

* Bart Schaefer <schaefer@brasslantern.com> [2002-03-23 19:54]:
> j=0
> for i in 1 2 3 4 5 10 15 20 25 30 35 40 35 40 45 50; do
>   print ${(l:3:)i}k : "$[${#${(f)$(print -l x *(N.Lk-${i}Lk+${j}))}}-1]"
>   ((j=i-1))
> done
> print Rest : "$[${#${(f)$(print -l x *(N.Lk+${j}))}}-1]"

(Bart's print) (not in output)
    1k : 0     .
    2k : 202   .**
    3k : 431   .****
    4k : 656   .******.
    5k : 717   .*******
   10k : 1316  .*************
   15k : 551   .*****.
   20k : 306   .***
   25k : 177   .*.
   30k : 128   .*
   35k : 102   .*
   40k : 75    ..
   35k : 0     .
   40k : 75    ..
   45k : 46    ..
   50k : 41    .
  Rest : 502   .*****

thanks, Bart! :-)

Sven  [reading up on "print"
       and glob patterns]