From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Mon, 1 Aug 2016 16:09:46 +0000 (+0100)
Subject: stv: fix ties
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=appendix-a6.git;a=commitdiff_plain;h=0f260f3d622f00becab215877dba0e2e260603c5;hp=2c0d1b163477f5472ca5f2495f5f436d5205889f

stv: fix ties
---

diff --git a/stv b/stv
index ba89fce..dae5563 100755
--- a/stv
+++ b/stv
@@ -203,19 +203,29 @@ for (;;) {
 	my $s = $sorted[0];
 	my $topvoters = $s->{Total};
 	my $surplus = $topvoters - $quota;
-	last unless $surplus > 0;
+	last unless $surplus >= 0;
 
-	printf "%7s %10s ***************\n", 'ELECTED', $s->{Cand};
-	push @elected, $s->{Cand};
+	my @elect = equalpiles 'elect?', @sorted;
 
-	foreach my $vote (@{ $s->{Votes} }) {
-	    votelog $vote, "elected $s->{Cand}";
+	if (@elect > $placesremain) {
+	    # oh my god
+	    @elect = historically_prefer +1, @elect;
+	    printf "%7s %10s\n", 'tie!', $elect[0]{Cand};
 	}
 
-	$s->{Surplus} = $surplus;
-	push @newsurpluses, $s;
-	delete $sorted{ $s->{Cand} };
-	delete $continuing{ $s->{Cand} };
+	foreach $s (@elect) {
+	    printf "%7s %10s ***************\n", 'ELECTED', $s->{Cand};
+	    push @elected, $s->{Cand};
+
+	    foreach my $vote (@{ $s->{Votes} }) {
+		votelog $vote, "elected $s->{Cand}";
+	    }
+
+	    $s->{Surplus} = $surplus;
+	    push @newsurpluses, $s;
+	    delete $sorted{ $s->{Cand} };
+	    delete $continuing{ $s->{Cand} };
+	}
 
 	$things_update->();
     }