source: scripts/neurons_in_f1/add_neuro.pl @ 123

#!/usr/bin/perl

# This script makes it easier to handle relative neural connections in f1 genotypes when adding/deleting neurons.
# Usage:
#   perl add_neuro.pl <neuron_number> <f1_genotype>
# If not provided, the <f1_genotype> will be read from stdin.
# <neuron_number> is 1-based.

# TODO: handle bounds (1..N) of <neuron_number> and display a warning when exceeded
# TODO: test thoroughly
# TODO: consider joining with del_neuro.pl or including a common part - 80% of the code is the same.

my $num = shift @ARGV;

my $geno;
if (@ARGV) {
        $geno = "@ARGV";
} else {
        $geno = (<STDIN>);
}

my @out;
my $idx = 0;
my $ratio = 1;
for (split /\[/, $geno) {
        if ($idx == 0) {
                push @out, $_;
                $idx++;
                next;
        }
        if ($idx == $num) {
                push @out, "NEW]";
                $idx++;
                $ratio *= -1;
        }
        my ($neuro, $rest) = split /\]/;
        my @neuroOut;
        foreach (split /,/, $neuro) {
                if (/([-0-9]+):(.*)/ && ($ratio * ($1 + $idx) >= $ratio * ($num))) {
                        push @neuroOut, join (':', ($1 + $ratio, $2));
                } else {
                        push @neuroOut, $_;
                }
        }
        push @out, join(',', @neuroOut) . ']' . $rest;
        $idx++;
}

printf "%s\n", join('[', @out);