shithub: neatroff

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tr: .dv request

This is almost equivalent to \X escape sequence, except that it is not
added to the current line buffer.  The argument of .dv is parsed as
the argument of .ds request.

--- a/out.c

+++ b/out.c

@@ -159,6 +159,11 @@

 	outnn("h%d", cwid);

 }

+void out_x(char *s)

+{

+	out("x X %s\n", s);

+}

+

 void out_line(char *s)

 {

 	char *c;

@@ -195,7 +200,7 @@

 			outnn("v%d", eval(c, 'v'));

 			break;

 		case 'X':

-			out("x X %s\n", c);

+			out_x(c);

 			break;

 		}

 	}

--- a/roff.h

+++ b/roff.h

@@ -346,6 +346,7 @@

 /* out.c */

 void out_line(char *s);				/* output rendered line */

+void out_x(char *s);				/* output \X requests */

 void out(char *s, ...);				/* output troff cmd */

 /* troff commands */

--- a/tr.c

+++ b/tr.c

@@ -931,6 +931,12 @@

 	}

 }

+static void tr_dv(char **args)

+{

+	if (args[1])

+		out_x(args[1]);

+}

+

 /* read a single macro argument */

 static int macroarg(struct sbuf *sbuf, int brk, int (*next)(void), void (*back)(int))

 {

@@ -1125,6 +1131,7 @@

 	{"di", tr_di},

 	{"ds", tr_ds, mkargs_ds},

 	{"dt", tr_dt},

+	{"dv", tr_dv, mkargs_eol},

 	{"ec", tr_ec},

 	{"el", tr_el, mkargs_null},

 	{"em", tr_em},