add some pretty printers

lib/Games/Emulation/DCPU16/Util.pm

@@ -0,0 +1,48 @@
+package Games::Emulation::DCPU16::Util;
+use strict;
+use warnings;
+
+use Exporter 'import';
+
+our @EXPORT_OK = ('format_registers', 'format_memory');
+
+sub format_registers {
+    my ($registers, $sp, $pc, $o) = @_;
+
+    return join("\n",
+        sprintf("A:  0x%04x    X:  0x%04x    I:  0x%04x",
+                $registers->[0], $registers->[3], $registers->[6]),
+        sprintf("B:  0x%04x    Y:  0x%04x    J:  0x%04x",
+                $registers->[1], $registers->[4], $registers->[7]),
+        sprintf("C:  0x%04x    Z:  0x%04x",
+                $registers->[2], $registers->[5]),
+        "",
+        sprintf("SP: 0x%04x    PC: 0x%04x    O:  0x%04x", $sp, $pc, $o),
+        "",
+    );
+}
+
+sub format_memory {
+    my ($memory) = @_;
+
+    my $out = '';
+    my $eliding = 0;
+    for my $addr (0..int(@$memory / 8)) {
+        $addr *= 8;
+        my @values = @{ $memory }[$addr..($addr + 7)];
+        if (grep { $_ } @values) {
+            $out .= sprintf("%04x:" . (" %04x" x 8), $addr, @values) . "\n";
+            $eliding = 0;
+        }
+        else {
+            if (!$eliding) {
+                $out .= "...\n";
+                $eliding = 1;
+            }
+        }
+    }
+
+    return $out;
+}
+
+1;