implement the roff(7) \p (break output line) escape sequence

1 files changed, 27 insertions, 8 deletions

diff --git a/html.c b/html.c
index 4bb3ca56..d92ec16a 100644
--- a/html.c
+++ b/html.c
@@ -1,4 +1,4 @@
-/*	$Id: html.c,v 1.213 2017/06/08 12:54:58 schwarze Exp $ */
+/*	$Id: html.c,v 1.214 2017/06/14 01:31:26 schwarze Exp $ */
 /*
  * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2011-2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
@@ -345,16 +345,18 @@ static int
 print_encode(struct html *h, const char *p, const char *pend, int norecurse)
 {
 	char		 numbuf[16];
-	size_t		 sz;
-	int		 c, len, nospace;
+	struct tag	*t;
 	const char	*seq;
+	size_t		 sz;
+	int		 c, len, breakline, nospace;
 	enum mandoc_esc	 esc;
-	static const char rejs[9] = { '\\', '<', '>', '&', '"',
+	static const char rejs[10] = { ' ', '\\', '<', '>', '&', '"',
 		ASCII_NBRSP, ASCII_HYPH, ASCII_BREAK, '\0' };
 
 	if (pend == NULL)
 		pend = strchr(p, '\0');
 
+	breakline = 0;
 	nospace = 0;
 
 	while (p < pend) {
@@ -365,14 +367,28 @@ print_encode(struct html *h, const char *p, const char *pend, int norecurse)
 		}
 
 		for (sz = strcspn(p, rejs); sz-- && p < pend; p++)
-			if (*p == ' ')
-				print_endword(h);
-			else
-				print_byte(h, *p);
+			print_byte(h, *p);
+
+		if (breakline &&
+		    (p >= pend || *p == ' ' || *p == ASCII_NBRSP)) {
+			t = print_otag(h, TAG_DIV, "");
+			print_text(h, "\\~");
+			print_tagq(h, t);
+			breakline = 0;
+			while (p < pend && (*p == ' ' || *p == ASCII_NBRSP))
+				p++;
+			continue;
+		}
 
 		if (p >= pend)
 			break;
 
+		if (*p == ' ') {
+			print_endword(h);
+			p++;
+			continue;
+		}
+
 		if (print_escape(h, *p++))
 			continue;
 
@@ -417,6 +433,9 @@ print_encode(struct html *h, const char *p, const char *pend, int norecurse)
 			if (c <= 0)
 				continue;
 			break;
+		case ESCAPE_BREAK:
+			breakline = 1;
+			continue;
 		case ESCAPE_NOSPACE:
 			if ('\0' == *p)
 				nospace = 1;