Re: [FWP] Sort challenge

["Christoph Wernli" <cw@dwc.ch>]

Lou Hevly wrote:
> 
> Given the following data:
> 
> __DATA__
> ae|Evans|Anne
> le|Evans|Louise
> he|Evans|Helen
> je|Evans|
> pete||Peter
> xs|Sanchez|
> rwj||
> est||
> 
> 1) If there's a last name, the program should sort first by that and then by the firstname (if there is one);
> 2) If no last name, then sort by first name;
> 3) If neither last nor first name, then sort by username
> 
> So the desired result is:
> 
> est
> Evans
> Evans, Anne
> Evans, Helen
> Evans, Louise
> Peter
> rwj
> Sanchez

I'm not so happy with the first foreach-loop - but all attempts to circumvent it with map
{} have failed (predictably...).

Cheers,

-Christoph


#!/usr/bin/perl -w

use strict;

my @x;
my @y;

while (<DATA>) {
        chomp;
        push @x, [split /\|/];
}


foreach (@x){
        my @c = @$_;
        not $c[1] and ($c[1] = $c[0]);
        push @y, \@c;
}


foreach (
        
        sort {

        (lc $y[$a][1] cmp lc $y[$b][1])
        or
        (lc $y[$a][2] cmp lc $y[$b][2])
        or
        (lc $y[$a][0] cmp lc $y[$b][0])

        }       0..$#y

        ) {

        ($x[$_][1] and $x[$_][2]) ? print "$x[$_][1], $x[$_][2]"
        :
        ($x[$_][1] ? print $x[$_][1] 
                :
                ($x[$_][2] ? print $x[$_][2]
                        : print $x[$_][0]));
        print "\n";

}       



__DATA__
ae|Evans|Anne
le|Evans|Louise
he|Evans|Helen
je|Evans|
pete||Peter
xs|Sanchez|
rwj||
est||

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