mdocml: Note that `Dd' can be empty.

mdocml: Note that `Dd' can be empty.

[kristaps]

Log Message:
-----------
Note that `Dd' can be empty.  This found following a thread on discuss@
started by Sascha Wildner, 07/25/2010 06:30 AM.

Modified Files:
--------------
    mdocml:
        mdoc.7
        mdoc_action.c
        mdoc_validate.c

Revision Data
-------------
Index: mdoc_validate.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mdoc_validate.c,v
retrieving revision 1.113
retrieving revision 1.114
diff -Lmdoc_validate.c -Lmdoc_validate.c -u -p -r1.113 -r1.114
--- mdoc_validate.c
+++ mdoc_validate.c
@@ -145,7 +145,7 @@ static	v_pre	 pres_ss[] = { pre_ss, NULL
 
 const	struct valids mdoc_valids[MDOC_MAX] = {
 	{ NULL, NULL },				/* Ap */
-	{ pres_dd, posts_text },		/* Dd */
+	{ pres_dd, posts_wtext },		/* Dd */
 	{ pres_dt, posts_dt },			/* Dt */
 	{ pres_os, NULL },			/* Os */
 	{ pres_sh, posts_sh },			/* Sh */ 
Index: mdoc_action.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mdoc_action.c,v
retrieving revision 1.76
retrieving revision 1.77
diff -Lmdoc_action.c -Lmdoc_action.c -u -p -r1.76 -r1.77
--- mdoc_action.c
+++ mdoc_action.c
@@ -904,6 +904,11 @@ post_dd(POST_ARGS)
 {
 	char		buf[DATESIZ];
 
+	if (NULL == n->child) {
+		m->meta.date = time(NULL);
+		return(post_prol(m, n));
+	}
+
 	if ( ! concat(m, buf, n->child, DATESIZ))
 		return(0);
 
Index: mdoc.7
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mdoc.7,v
retrieving revision 1.141
retrieving revision 1.142
diff -Lmdoc.7 -Lmdoc.7 -u -p -r1.141 -r1.142
--- mdoc.7
+++ mdoc.7
@@ -805,7 +805,7 @@ then the macro accepts an arbitrary numb
 .It Sx \&Cd  Ta    Yes      Ta    Yes      Ta    >0
 .It Sx \&Cm  Ta    Yes      Ta    Yes      Ta    n
 .It Sx \&Db  Ta    \&No     Ta    \&No     Ta    1
-.It Sx \&Dd  Ta    \&No     Ta    \&No     Ta    >0
+.It Sx \&Dd  Ta    \&No     Ta    \&No     Ta    n
 .It Sx \&Dt  Ta    \&No     Ta    \&No     Ta    n
 .It Sx \&Dv  Ta    Yes      Ta    Yes      Ta    n
 .It Sx \&Dx  Ta    Yes      Ta    Yes      Ta    n
@@ -1470,7 +1470,7 @@ This is the mandatory first macro of any
 manual.
 Its syntax is as follows:
 .Pp
-.D1 Pf \. Sx \&Dd Ar date
+.D1 Pf \. Sx \&Dd Op Ar date
 .Pp
 The
 .Ar date
@@ -1480,7 +1480,7 @@ which signifies the current manual revis
 .Xr cvs 1 ,
 or instead a valid canonical date as specified by
 .Sx Dates .
-If a date does not conform, the current date is used instead.
+If a date does not conform or is empty, the current date is used.
 .Pp
 Examples:
 .D1 \&.Dd $\&Mdocdate$
@@ -2717,6 +2717,12 @@ Heirloom troff, the other significant tr
 \-mdoc, is similar to historic groff.
 .Pp
 .Bl -dash -compact
+.It
+An empty
+.Sq \&Dd
+macro in groff prints
+.Dq Epoch .
+In mandoc, it resolves to the current date.
 .It
 The \es (font size), \em (font colour), and \eM (font filling colour)
 font decoration escapes are all discarded in mandoc.
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