[PATCH] .Bk with invalid arguments

[PATCH] .Bk with invalid arguments

[Ingo Schwarze]

Hi,

while looking at some regression tests and trying to get them committed,
i noticed that .Bk behaves differently when given invalid arguments.

 1. .Bk -words works the same with mandoc, old and new groff.
 2. .Bk without any arg should default to -words
     according to new groff.
 3. .Bk with invalid args (or -lines) should have no effect
     according to new groff.

The following mini-patch adjusts mandoc to do the same.
For now, -words is the only argument accepted by mandoc,
so to catch case 1, it's sufficient to check for any arguments
at all, and to catch 2, it's suffcient to check that the HEAD
has no children.

OK?


Index: mdoc_term.c
===================================================================
RCS file: /cvs/src/usr.bin/mandoc/mdoc_term.c,v
retrieving revision 1.115
diff -u -p -r1.115 mdoc_term.c
--- mdoc_term.c	6 Dec 2010 22:10:13 -0000	1.115
+++ mdoc_term.c	11 Dec 2010 23:58:41 -0000
@@ -2124,7 +2124,8 @@ termp_bk_pre(DECL_ARGS)
 	case (MDOC_HEAD):
 		return(0);
 	case (MDOC_BODY):
-		p->flags |= TERMP_PREKEEP;
+		if (n->parent->args || 0 == n->prev->nchild)
+			p->flags |= TERMP_PREKEEP;
 		break;
 	default:
 		abort();
--
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