mdocml: Make SYNOPSIS sections and code having .nr nS enabled behave as

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
Make SYNOPSIS sections and code having .nr nS enabled
behave as if the whole code were wrapped in .Bk/.Ek,
i.e. keeping input lines together on output lines.
This is compatible with new groff behaviour and deviates
from historical groff.
Tweaked version of a patch sent by kristaps@ on July 16, 2010.
ok kristaps@ jmc@ sobrado@ millert@

Modified Files:
--------------
    mdocml:
        mdoc_term.c

Revision Data
-------------
Index: mdoc_term.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mdoc_term.c,v
retrieving revision 1.196
retrieving revision 1.197
diff -Lmdoc_term.c -Lmdoc_term.c -u -p -r1.196 -r1.197
--- mdoc_term.c
+++ mdoc_term.c
@@ -319,9 +319,12 @@ print_mdoc_node(DECL_ARGS)
 	/*
 	 * Keeps only work until the end of a line.  If a keep was
 	 * invoked in a prior line, revert it to PREKEEP.
+	 *
+	 * Also let SYNPRETTY sections behave as if they were wrapped
+	 * in a `Bk' block.
 	 */
 
-	if (TERMP_KEEP & p->flags) {
+	if (TERMP_KEEP & p->flags || MDOC_SYNPRETTY & n->flags) {
 		if (n->prev && n->prev->line != n->line) {
 			p->flags &= ~TERMP_KEEP;
 			p->flags |= TERMP_PREKEEP;
@@ -332,6 +335,16 @@ print_mdoc_node(DECL_ARGS)
 			}
 		}
 	}
+
+	/*
+	 * Since SYNPRETTY sections aren't "turned off" with `Ek',
+	 * we have to intuit whether we should disable formatting.
+	 */
+
+	if ( ! (MDOC_SYNPRETTY & n->flags) &&
+	    ((n->prev   && MDOC_SYNPRETTY & n->prev->flags) ||
+	     (n->parent && MDOC_SYNPRETTY & n->parent->flags)))
+		p->flags &= ~(TERMP_KEEP | TERMP_PREKEEP);
 
 	if (chld && n->child)
 		print_mdoc_nodelist(p, &npair, m, n->child);
--
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