mdocml: implement .DT in terms of .ta; needed for print/ghostview, for

mdocml: implement .DT in terms of .ta; needed for print/ghostview, for

[schwarze]

Log Message:
-----------
implement .DT in terms of .ta; needed for print/ghostview, for example

Modified Files:
--------------
    mdocml:
        man.7
        man_term.c

Revision Data
-------------
Index: man.7
===================================================================
RCS file: /home/cvs/mdocml/mdocml/man.7,v
retrieving revision 1.134
retrieving revision 1.135
diff -Lman.7 -Lman.7 -u -p -r1.134 -r1.135
--- man.7
+++ man.7
@@ -348,8 +348,12 @@ See also
 and
 .Sx \&IR .
 .Ss \&DT
-Has no effect.
-Included for compatibility.
+Restore the default tabulator positions.
+They are at intervals of 0.5 inches.
+This has no effect unless the tabulator positions were changed with the
+.Xr roff 7
+.Ic \&ta
+request.
 .Ss \&EE
 This is a non-standard GNU extension, included only for compatibility.
 In
Index: man_term.c
===================================================================
RCS file: /home/cvs/mdocml/mdocml/man_term.c,v
retrieving revision 1.198
retrieving revision 1.199
diff -Lman_term.c -Lman_term.c -u -p -r1.198 -r1.199
--- man_term.c
+++ man_term.c
@@ -68,6 +68,7 @@ static	void		  print_bvspace(struct term
 				const struct roff_node *, int);
 
 static	int		  pre_B(DECL_ARGS);
+static	int		  pre_DT(DECL_ARGS);
 static	int		  pre_HP(DECL_ARGS);
 static	int		  pre_I(DECL_ARGS);
 static	int		  pre_IP(DECL_ARGS);
@@ -117,7 +118,7 @@ static	const struct termact __termacts[M
 	{ pre_literal, NULL, 0 }, /* fi */
 	{ NULL, NULL, 0 }, /* RE */
 	{ pre_RS, post_RS, 0 }, /* RS */
-	{ pre_ign, NULL, 0 }, /* DT */
+	{ pre_DT, NULL, 0 }, /* DT */
 	{ pre_ign, NULL, MAN_NOTEXT }, /* UC */
 	{ pre_PD, NULL, MAN_NOTEXT }, /* PD */
 	{ pre_ign, NULL, 0 }, /* AT */
@@ -388,6 +389,15 @@ pre_in(DECL_ARGS)
 	if (p->offset > SHRT_MAX)
 		p->offset = term_len(p, p->defindent);
 
+	return 0;
+}
+
+static int
+pre_DT(DECL_ARGS)
+{
+	term_tab_set(p, NULL);
+	term_tab_set(p, "T");
+	term_tab_set(p, ".5i");
 	return 0;
 }
 
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