mandoc: For compatibility with the man(1) implementations of the man-1.6

mandoc: For compatibility with the man(1) implementations of the man-1.6

[schwarze]

Log Message:
-----------
For compatibility with the man(1) implementations of the man-1.6
and man-db packages, print the manpath if the -w option is given 
without a following name argument.

This quirk has been in man-1.6 since at least man-1.5e (1998)
and in man-db since 2012.

Using this feature in portable software is a dubious idea because the 
internal organization of manual page directories varies in about a
dozen respects among operating systems, so even if you get the answer, 
there is no portable way to use it for looking up anything inside.
However, Matej Cepl <mcepl at suse dot cz> made me aware that some
software, for example the manual viewing functionality in the newest
editors/neovim code, unwisely relies on this feature anyway.

No objections were raised when this patch was shown on tech@.

Modified Files:
--------------
    mandoc:
        main.c
        man.1

Revision Data
-------------
Index: man.1
===================================================================
RCS file: /home/cvs/mandoc/mandoc/man.1,v
retrieving revision 1.36
retrieving revision 1.37
diff -Lman.1 -Lman.1 -u -p -r1.36 -r1.37
--- man.1
+++ man.1
@@ -3,7 +3,7 @@
 .\" Copyright (c) 1989, 1990, 1993
 .\"	The Regents of the University of California.  All rights reserved.
 .\" Copyright (c) 2003, 2007, 2008, 2014 Jason McIntyre <jmc@openbsd.org>
-.\" Copyright (c) 2010, 2011, 2014-2018 Ingo Schwarze <schwarze@openbsd.org>
+.\" Copyright (c) 2010, 2011, 2014-2020 Ingo Schwarze <schwarze@openbsd.org>
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions
@@ -199,6 +199,9 @@ Kernel internals.
 .It Fl w
 List the pathnames of all matching manual pages instead of displaying
 any of them.
+If no
+.Ar name
+is given, list the directories that would be searched.
 .El
 .Pp
 The options
Index: main.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/main.c,v
retrieving revision 1.342
retrieving revision 1.343
diff -Lmain.c -Lmain.c -u -p -r1.342 -r1.343
--- main.c
+++ main.c
@@ -448,8 +448,20 @@ main(int argc, char *argv[])
 	/* man(1): Resolve each name individually. */
 
 	if (search.argmode == ARG_NAME) {
-		if (argc < 1)
-			usage(ARG_NAME);
+		if (argc < 1) {
+			if (outmode != OUTMODE_FLN)
+				usage(ARG_NAME);
+			if (conf.manpath.sz == 0) {
+				warnx("The manpath is empty.");
+				mandoc_msg_setrc(MANDOCLEVEL_BADARG);
+			} else {
+				for (i = 0; i + 1 < conf.manpath.sz; i++)
+					printf("%s:", conf.manpath.paths[i]);
+				printf("%s\n", conf.manpath.paths[i]);
+			}
+			manconf_free(&conf);
+			return (int)mandoc_msg_getrc();
+		}
 		for (res = NULL, ressz = 0; argc > 0; argc--, argv++) {
 			(void)mansearch(&search, &conf.manpath,
 			    1, argv, &resn, &resnsz);
--
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