From e7b68c6d2c0067916b7389ffc4ae72b567852c95 Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@openbsd.org>
Date: Sat, 14 Aug 2021 13:53:08 +0000
Subject: print a BAGARG message if -T markdown is requested on man(7) input;
 suggested by Michael Stapelberg at debian dot org

---
 main.c       |  5 ++++-
 mandoc.1     | 10 +++++++++-
 mandoc.h     |  3 ++-
 mandoc_msg.c |  1 +
 4 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/main.c b/main.c
index a74af3fb..f0e2d873 100644
--- a/main.c
+++ b/main.c
@@ -1,4 +1,4 @@
-/* $Id: main.c,v 1.355 2021/06/02 18:28:19 schwarze Exp $ */
+/* $Id: main.c,v 1.356 2021/08/14 13:53:08 schwarze Exp $ */
 /*
  * Copyright (c) 2010-2012, 2014-2021 Ingo Schwarze <schwarze@openbsd.org>
  * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
@@ -968,6 +968,9 @@ parse(struct mparse *mp, int fd, const char *file,
 		case OUTT_PS:
 			terminal_man(outst->outdata, meta);
 			break;
+		case OUTT_MARKDOWN:
+			mandoc_msg(MANDOCERR_MAN_TMARKDOWN, 0, 0, NULL);
+			break;
 		default:
 			break;
 		}
diff --git a/mandoc.1 b/mandoc.1
index 669cf9fb..f7490963 100644
--- a/mandoc.1
+++ b/mandoc.1
@@ -15,7 +15,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: July 4 2021 $
+.Dd $Mdocdate: August 14 2021 $
 .Dt MANDOC 1
 .Os
 .Sh NAME
@@ -2371,6 +2371,14 @@ The
 .Fl O Cm tag
 option was specified but the tag was not found in any of the displayed
 manual pages.
+.It Sy "\-Tmarkdown unsupported for man(7) input"
+.Pq man
+The
+.Fl T Cm markdown
+option was specified but an input file uses the
+.Xr man 7
+language.
+No output is produced for that input file.
 .El
 .Sh SEE ALSO
 .Xr apropos 1 ,
diff --git a/mandoc.h b/mandoc.h
index ff76e71f..9837ff2a 100644
--- a/mandoc.h
+++ b/mandoc.h
@@ -1,4 +1,4 @@
-/* $Id: mandoc.h,v 1.273 2021/08/10 12:55:03 schwarze Exp $ */
+/* $Id: mandoc.h,v 1.274 2021/08/14 13:53:08 schwarze Exp $ */
 /*
  * Copyright (c) 2012-2021 Ingo Schwarze <schwarze@openbsd.org>
  * Copyright (c) 2010, 2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
@@ -257,6 +257,7 @@ enum	mandocerr {
 	MANDOCERR_BADVAL_BAD, /* bad argument value */
 	MANDOCERR_BADVAL_DUPE, /* duplicate argument value */
 	MANDOCERR_TAG, /* no such tag */
+	MANDOCERR_MAN_TMARKDOWN, /* -Tmarkdown unsupported for man(7) input */
 
 	MANDOCERR_SYSERR, /* ===== start of system errors ===== */
 
diff --git a/mandoc_msg.c b/mandoc_msg.c
index 8867bb4b..beec5059 100644
--- a/mandoc_msg.c
+++ b/mandoc_msg.c
@@ -257,6 +257,7 @@ static	const char *const type_message[MANDOCERR_MAX] = {
 	"bad option value",
 	"duplicate option value",
 	"no such tag",
+	"-Tmarkdown unsupported for man(7) input",
 
 	/* system errors */
 	NULL,
-- 
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