From faba831bf482467efd38e779aada81746a90996f Mon Sep 17 00:00:00 2001
From: Ian Jackson <ian@liberator.relativity.greenend.org.uk>
Date: Mon, 29 Mar 2010 23:19:45 +0100
Subject: [PATCH] where-vessels: complain if ocean or pirate are empty string

---
 yarrg/where-vessels | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/yarrg/where-vessels b/yarrg/where-vessels
index 9b8c772..272a114 100755
--- a/yarrg/where-vessels
+++ b/yarrg/where-vessels
@@ -133,6 +133,9 @@ proc argdefaults {} {
 	if {[info exists ocean]} { lappend cmd --ocean $ocean }
 	if {[info exists pirate]} { lappend cmd --pirate $pirate }
 	manyset [split [eval exec $cmd] " "] ocean pirate
+	if {![llength $ocean] || ![llength $pirate]} {
+	    error "$ocean $pirate ?"
+	}
     }
     lappend scraper $ocean
 }
-- 
2.30.2