TAPify the ancient-diffs report.

tests/Makefile

@@ -136,8 +136,8 @@ count:
 
 ancient: $(SGAMES)
 	@if [ -f ../advent430 ]; then cp ../advent430 ../adventure.data .; else echo "advent430 nonexistent"; exit 1; fi
-	@for x in *.log; do stem=$${x%.log}; echo $${stem}; ./advent430 <$${stem}.log | ./oldfilter >$${stem}.ochk; done 
-	@for x in *.log; do stem=$${x%.log}; ./newfilter <$${stem}.chk | diff -ubZ $${stem}.ochk -; done
+	@-for x in *.log; do stem=$${x%.log}; echo $${stem}; ./advent430 <$${stem}.log | ./oldfilter >$${stem}.ochk; done
+	@-(for x in *.log; do stem=$${x%.log}; legend=$$(sed -n '/^## /s///p' <$$x 2>/dev/null || echo "(no description)"); ./newfilter <$${stem}.chk | tapdiffer -w "$${legend}" $${stem}.ochk; done; echo 1..$(words $(shell ls *.log))) | tapview
 	@rm *.ochk advent430 adventure.data
 
 # end

tests/tapdiffer

@@ -8,12 +8,20 @@
 # A nonempty diff is shipped as a TAP YAML block following "not ok" 
 # unless QUIET=1 in the environment.
 #
+if [ "$1" = "-w" ]
+then
+    diffopts=-ubZ
+    shift
+else
+    diffopts=-u
+fi
+
 legend=$1
 checkfile=$2
 
 trap 'rm /tmp/tapdiff$$' EXIT HUP INT QUIT TERM
 
-if diff --text -u ${checkfile} - >/tmp/tapdiff$$
+if diff --text "${diffopts}" ${checkfile} - >/tmp/tapdiff$$
 then
 	echo "ok - ${legend}"
 else