mandoc: For .%R RFC, link to rfc-editor.org in -T markdown output just

mandoc: For .%R RFC, link to rfc-editor.org in -T markdown output just

[schwarze]

Log Message:
-----------
For .%R RFC, link to rfc-editor.org in -T markdown output
just like it was done for -T html in mdoc_html.c rev. 1.351.

Modified Files:
--------------
    mandoc:
        mdoc_markdown.c
    mandoc/regress/mdoc/Rs:
        rfc.out_markdown

Revision Data
-------------
Index: mdoc_markdown.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mdoc_markdown.c,v
diff -Lmdoc_markdown.c -Lmdoc_markdown.c -u -p -r1.38 -r1.39
--- mdoc_markdown.c
+++ mdoc_markdown.c
@@ -1,6 +1,6 @@
 /* $Id$ */
 /*
- * Copyright (c) 2017, 2018, 2020 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2017, 2018, 2020, 2025 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -85,6 +85,7 @@ static	int	 md_pre_Sh(struct roff_node *
 static	int	 md_pre_Sm(struct roff_node *);
 static	int	 md_pre_Vt(struct roff_node *);
 static	int	 md_pre_Xr(struct roff_node *);
+static	int	 md_pre__R(struct roff_node *);
 static	int	 md_pre__T(struct roff_node *);
 static	int	 md_pre_br(struct roff_node *);
 
@@ -159,7 +160,7 @@ static	const struct md_act md_acts[MDOC_
 	{ NULL, NULL, md_post_pc, NULL, NULL }, /* %N */
 	{ NULL, NULL, md_post_pc, NULL, NULL }, /* %O */
 	{ NULL, NULL, md_post_pc, NULL, NULL }, /* %P */
-	{ NULL, NULL, md_post_pc, NULL, NULL }, /* %R */
+	{ NULL, md_pre__R, md_post_pc, NULL, NULL }, /* %R */
 	{ NULL, md_pre__T, md_post__T, NULL, NULL }, /* %T */
 	{ NULL, NULL, md_post_pc, NULL, NULL }, /* %V */
 	{ NULL, NULL, NULL, NULL, NULL }, /* Ac */
@@ -1577,6 +1578,34 @@ md_pre_Xr(struct roff_node *n)
 	md_word("(");
 	md_node(n);
 	md_word(")");
+	return 0;
+}
+
+static int
+md_pre__R(struct roff_node *n)
+{
+	const unsigned char	*cp;
+	const char		*arg;
+
+	arg = n->child->string;
+
+	if (strncmp(arg, "RFC ", 4) != 0)
+		return 1;
+	cp = arg += 4;
+	while (isdigit(*cp))
+		cp++;
+	if (*cp != '\0')
+		return 1;
+
+	md_rawword("[RFC ");
+	outflags &= ~MD_spc;
+	md_rawword(arg);
+	outflags &= ~MD_spc;
+	md_rawword("](http://www.rfc-editor.org/rfc/rfc");
+	outflags &= ~MD_spc;
+	md_rawword(arg);
+	outflags &= ~MD_spc;
+	md_rawword(".html)");
 	return 0;
 }
 
Index: rfc.out_markdown
===================================================================
RCS file: /home/cvs/mandoc/mandoc/regress/mdoc/Rs/rfc.out_markdown,v
diff -Lregress/mdoc/Rs/rfc.out_markdown -Lregress/mdoc/Rs/rfc.out_markdown -u -p -r1.1 -r1.2
--- regress/mdoc/Rs/rfc.out_markdown
+++ regress/mdoc/Rs/rfc.out_markdown
@@ -10,7 +10,7 @@ BEGINTEST
 
 David Waitzman,
 *A Standard for the Transmission of IP Datagrams on Avian Carriers*,
-RFC 1149,
+[RFC 1149](http://www.rfc-editor.org/rfc/rfc1149.html),
 April 1990.
 
 ENDTEST
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