If the layout or data of an individual cell in a tbl(7) contains

only "_", "-", or "=", requesting a horizontal line to be drawn
across the middle of the cell, print <hr/> in that cell in HTML
output.

That is arguably slightly ugly because HTML 5 regards <hr/> as
semantic markup, meaning "thematic break".  If somebody knowns
a better way to render a horizontal line across the middle of a
table cell with pure HTML and CSS, and without implying a specific
meaning, please tell me.

Missing feature reported by <Oliver dot Corff at email dot de>.

3 files changed, 11 insertions, 4 deletions

diff --git a/html.c b/html.c
index 7cd694f1..71c9c711 100644
--- a/html.c
+++ b/html.c
@@ -1,4 +1,4 @@
-/* $Id: html.c,v 1.274 2021/08/10 12:55:03 schwarze Exp $ */
+/* $Id: html.c,v 1.275 2021/09/09 14:47:24 schwarze Exp $ */
 /*
  * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2011-2015, 2017-2021 Ingo Schwarze <schwarze@openbsd.org>
@@ -91,6 +91,7 @@ static	const struct htmldata htmltags[TAG_MAX] = {
 	{"span",	HTML_INPHRASE | HTML_TOPHRASE},
 	{"var",		HTML_INPHRASE | HTML_TOPHRASE},
 	{"br",		HTML_INPHRASE | HTML_NOSTACK | HTML_NLALL},
+	{"hr",		HTML_INPHRASE | HTML_NOSTACK},
 	{"mark",	HTML_INPHRASE },
 	{"math",	HTML_INPHRASE | HTML_NLALL | HTML_INDENT},
 	{"mrow",	0},
diff --git a/html.h b/html.h
index 07a42a0c..3d201403 100644
--- a/html.h
+++ b/html.h
@@ -1,4 +1,4 @@
-/* $Id: html.h,v 1.108 2020/04/18 20:40:10 schwarze Exp $ */
+/* $Id: html.h,v 1.109 2021/09/09 14:47:24 schwarze Exp $ */
 /*
  * Copyright (c) 2017, 2018, 2019, 2020 Ingo Schwarze <schwarze@openbsd.org>
  * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
@@ -51,6 +51,7 @@ enum	htmltag {
 	TAG_SPAN,
 	TAG_VAR,
 	TAG_BR,
+	TAG_HR,
 	TAG_MARK,
 	TAG_MATH,
 	TAG_MROW,
diff --git a/tbl_html.c b/tbl_html.c
index ce03c6ac..cc4922a8 100644
--- a/tbl_html.c
+++ b/tbl_html.c
@@ -1,4 +1,4 @@
-/*	$Id: tbl_html.c,v 1.36 2021/08/10 12:55:04 schwarze Exp $ */
+/*	$Id: tbl_html.c,v 1.37 2021/09/09 14:47:24 schwarze Exp $ */
 /*
  * Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2014,2015,2017,2018,2021 Ingo Schwarze <schwarze@openbsd.org>
@@ -241,7 +241,12 @@ print_tbl(struct html *h, const struct tbl_span *sp)
 		    "vertical-align", valign,
 		    "text-align", halign,
 		    "border-right-style", rborder);
-		if (dp->string != NULL) {
+		if (dp->layout->pos == TBL_CELL_HORIZ ||
+		    dp->layout->pos == TBL_CELL_DHORIZ ||
+		    dp->pos == TBL_DATA_HORIZ ||
+		    dp->pos == TBL_DATA_DHORIZ)
+			print_otag(h, TAG_HR, "");
+		else if (dp->string != NULL) {
 			save_font = h->metac;
 			html_setfont(h, dp->layout->font);
 			if (dp->layout->pos == TBL_CELL_LONG)