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#!/usr/bin/perl -w

die "Two args plz (dat/descript/foo.{key,val}), m'kay?\n" if $#ARGV != 1;

undef $/;

open IN, "<", $ARGV[0] or die "Can't open $ARGV[0]\n";
$_ = <IN>;
close IN;
my @keys = split /%%%%\n/s;

open IN, "<", $ARGV[1] or die "Can't open $ARGV[1]\n";
$_ = <IN>;
close IN;
my @vals = split /%%%%\n/s;

die "$#keys keys but $#vals vals\n" if $#keys != $#vals;

open OUT, ">spliced.txt" or die "Can't write to spliced.txt\n";
for (0..$#keys)
{
    print OUT ($vals[$_] ? "$keys[$_]\n$vals[$_]%%%%\n" : "$keys[$_]%%%%\n");
}
close OUT;

print "Output written as ./spliced.txt, please review it before installing.\n";