From 740f368b29ddba47de9589095bf6e5f80a377ae5 Mon Sep 17 00:00:00 2001
From: schwarze <schwarze@openbsd.org>
Date: Wed, 25 Dec 2013 14:40:29 +0000
Subject: [PATCH] In the SYNOPSIS, implement hanging indentation for .Fo and
 avoid output line breaks inside .Fa arguments. This reduces groff-mandoc
 differences in base by more than 8%. Patch from Franco Fichtner <franco at
 lastsummer dot de> (DragonFly).

---
 usr.bin/mandoc/mdoc_term.c | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

diff --git a/usr.bin/mandoc/mdoc_term.c b/usr.bin/mandoc/mdoc_term.c
index ac5b7e0d0c7..1888ffd2105 100644
--- a/usr.bin/mandoc/mdoc_term.c
+++ b/usr.bin/mandoc/mdoc_term.c
@@ -1,7 +1,8 @@
-/*	$Id: mdoc_term.c,v 1.157 2013/12/25 00:39:13 schwarze Exp $ */
+/*	$Id: mdoc_term.c,v 1.158 2013/12/25 14:40:29 schwarze Exp $ */
 /*
  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010, 2012, 2013 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2013 Franco Fichtner <franco@lastsummer.de>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -1597,20 +1598,17 @@ termp_fa_pre(DECL_ARGS)
 
 	for (nn = n->child; nn; nn = nn->next) {
 		term_fontpush(p, TERMFONT_UNDER);
+		if (MDOC_SYNPRETTY & n->flags)
+			p->flags |= TERMP_NBRWORD;
 		term_word(p, nn->string);
 		term_fontpop(p);
 
-		if (nn->next) {
+		if (nn->next || (n->next && n->next->tok == MDOC_Fa)) {
 			p->flags |= TERMP_NOSPACE;
 			term_word(p, ",");
 		}
 	}
 
-	if (n->child && n->next && n->next->tok == MDOC_Fa) {
-		p->flags |= TERMP_NOSPACE;
-		term_word(p, ",");
-	}
-
 	return(0);
 }
 
@@ -2032,16 +2030,32 @@ termp_quote_post(DECL_ARGS)
 static int
 termp_fo_pre(DECL_ARGS)
 {
+	size_t		 width, rmargin = 0;
+	int		 pretty;
+
+	pretty = MDOC_SYNPRETTY & n->flags;
 
 	if (MDOC_BLOCK == n->type) {
 		synopsis_pre(p, n);
 		return(1);
 	} else if (MDOC_BODY == n->type) {
+		if (pretty) {
+			width = term_len(p, 4);
+			rmargin = p->rmargin;
+			p->rmargin = p->offset + width;
+			p->flags |= TERMP_NOBREAK | TERMP_HANG;
+		}
 		p->flags |= TERMP_NOSPACE;
 		term_word(p, "(");
 		p->flags |= TERMP_NOSPACE;
+		if (pretty) {
+			term_flushln(p);
+			p->flags &= ~(TERMP_NOBREAK | TERMP_HANG);
+			p->offset = p->rmargin;
+			p->rmargin = rmargin;
+		}
 		return(1);
-	} 
+	}
 
 	if (NULL == n->child)
 		return(0);
@@ -2069,6 +2083,7 @@ termp_fo_post(DECL_ARGS)
 	if (MDOC_SYNPRETTY & n->flags) {
 		p->flags |= TERMP_NOSPACE;
 		term_word(p, ";");
+		term_flushln(p);
 	}
 }
 
-- 
2.20.1