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tr: .co request to copy the contents of a register from or into a file

To write the contents of register xy to out.txt:
  .co xy >out.txt
To read the contents file out.txt into register xy:
  .co xy <out.txt

--- a/tr.c

+++ b/tr.c

@@ -858,6 +858,33 @@

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

 }

+static void tr_co(char **args)

+{

+	char *reg = args[1];

+	char *path = args[2];

+	char buf[1024];

+	if (!reg || !reg[0] || !path || !path[0])

+		return;

+	if (path[0] == '>') {

+		FILE *fp = fopen(path + 1, "w");

+		if (fp && reg && str_get(map(reg)))

+			fputs(str_get(map(reg)), fp);

+		if (fp)

+			fclose(fp);

+	}

+	if (path[0] == '<') {

+		FILE *fp = fopen(path + 1, "r");

+		struct sbuf sb;

+		sbuf_init(&sb);

+		while (fp && fgets(buf, sizeof(buf), fp))

+			sbuf_append(&sb, buf);

+		str_set(map(reg), sbuf_buf(&sb));

+		sbuf_done(&sb);

+		if (fp)

+			fclose(fp);

+	}

+}

+

 /* read a macro argument */

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

 {

@@ -1035,12 +1062,12 @@

 	{"br", tr_br},

 	{"c2", tr_c2},

 	{"cc", tr_cc},

-	{"ochar", tr_ochar, mkargs_ochar},

 	{"ce", tr_ce},

 	{"ch", tr_ch},

 	{"char", tr_char, mkargs_ds},

 	{"chop", tr_chop, mkargs_reg1},

 	{"cl", tr_cl},

+	{"co", tr_co, mkargs_ds},

 	{"cp", tr_cp},

 	{"cs", tr_cs},

 	{"da", tr_di},

@@ -1099,6 +1126,7 @@

 	{"nr", tr_nr, mkargs_reg1},

 	{"ns", tr_ns},

 	{"nx", tr_nx},

+	{"ochar", tr_ochar, mkargs_ochar},

 	{"os", tr_os},

 	{"pc", tr_pc},

 	{"pl", tr_pl},