shithub: neatroff

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tr: .blm request

Suggested and tested by aksr <aksr@t-com.me>.

--- a/tr.c

+++ b/tr.c

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

 #include "roff.h"

 static int tr_nl = 1;		/* just read a newline */

+static int tr_bm = -1;		/* blank line macro */

 char c_pc[GNLEN] = "%";		/* page number character */

 int c_ec = '\\';		/* escape character */

 int c_cc = '.';			/* control character */

@@ -834,6 +835,11 @@

 		font_map(fn, args[2], args[3]);

 }

+static void tr_blm(char **args)

+{

+	tr_bm = args[1] ? map(args[1]) : -1;

+}

+

 /* read a macro argument */

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

 {

@@ -1016,6 +1022,7 @@

 	{"am", tr_de, mkargs_reg1},

 	{"as", tr_as, mkargs_ds},

 	{"bd", tr_bd},

+	{"blm", tr_blm},

 	{"bp", tr_bp},

 	{"br", tr_br},

 	{"c2", tr_c2},

@@ -1147,12 +1154,18 @@

 		}

 		cp_back(c2);

 	}

-	if (c < 0 || (c != c_cc && c != c_c2)) {

+	if (c < 0 || (c != c_cc && c != c_c2 && (c != '\n' || tr_bm < 0))) {

 		cp_back(c);

 		return 1;

 	}

 	cp_reqbeg();

-	cmd = read_name(n_cp);

+	if (c != '\n') {

+		cmd = read_name(n_cp);

+	} else {		/* blank line macro */

+		cmd = malloc(strlen(map_name(tr_bm)) + 1);

+		strcpy(cmd, map_name(tr_bm));

+		cp_back(c);

+	}

 	args[0] = dotted(cmd, c);

 	req = str_dget(map(cmd));

 	if (req) {