Hi, I'm trying to write a testscript that will print all symbols that are used in another script like this:

symdump script1.pl 5 7
[download]

This will dump the symbol table after line 5 in the script and after line 7 in the script. This far I've come up with this:

#!/usr/bin/perl

use strict;
use warnings;
use Devel::Symdump;

$| = 1;

my $code;

my $program=shift @ARGV;
die ("usage: $0 <programname> <linenr.> [<linenr.>...]\n") unless ($pr
+ogram);
open (PRG, $program) or die "cant open '$program'\n";

my $symdumpcode = "
\$main::obj=Devel::Symdump->rnew('ThisIsAnotherPackageAndMostLikelyWil
+lNeverCollideWithAnyOtherNamespace'); 
print \$main::obj->as_string();
";

my $idx=0;
foreach my $arg (sort {$a <=> $b} @ARGV) {
    while (<PRG>) {
        $idx++;
        $code .= $_;
        last if ($arg == $idx and $code .= $symdumpcode);
    }
}
close PRG;

eval "package ThisIsAnotherPackageAndMostLikelyWillNeverCollideWithAny
+OtherNamespace;
$code";

print $@ if ($@);
[download]

This doesn't print any symbols for my testscripts. If I change the rnew('<longpackagename>') to rnew('main') it will print all symbols including the symbols used in Devel::Symdump. Tried using the diff method in Devel::Symdump but that does only show a diff (duh), so any packages used in my script AND in Devel::Symdump will not show up. What I could do is make 2 Symdump-objects, one of the eval-ed code, one of Devel::Symdump itself, and compare their as_string output manually (it's sorted already), but that doesn't help me understand why the above code doesn't work.

My questions:

• Why does a Symdump on a package within the eval not show the symbols within that package? (I guess it's got something to do with compile vs. runtime but can't bend my brain around this one)
• There must obviously be MTOWTDI (checking %main:: ?). Any ideas on how to do this simpler/better/more elegant? Any pointers to similar scripts (couldn't find any myself)?

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