Fix divide by zero.

Arvados-DCO-1.1-Signed-off-by: Tom Clegg <tom@tomclegg.ca>

diff --git a/export.go b/export.go
index b6b160ddb79311fe3a5964b25e2ca0efe482abdc..958da95a1703edee2d5b718558504be713070f70 100644 (file)
--- a/export.go
+++ b/export.go
@@ -405,8 +405,13 @@ func (cmd *exporter) exportSeq(outw, bedw io.Writer, taglen int, seqname string,
                                thickstart = 0
                        }
                        thickend := refpos
+
                        // coverage score, 0 to 1000
-                       score := 1000 * tagcoverage / len(cgs) / 2
+                       score := 1000
+                       if len(cgs) > 0 {
+                               score = 1000 * tagcoverage / len(cgs) / 2
+                       }
+
                        fmt.Fprintf(bedw, "%s %d %d %d %d . %d %d\n",
                                seqname, tilestart, tileend,
                                libref.Tag,