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vt: add -r flag to start in raw mode

--- a/sys/man/1/vt

+++ b/sys/man/1/vt

@@ -4,7 +4,7 @@

 .SH SYNOPSIS

 .B vt

 [

-.B -2abcx

+.B -2abcrx

 ]

 [

 .B -f

@@ -52,6 +52,9 @@

 names a

 .I log

 file for the session.

+.TP

+.B r

+start in raw mode.

 .SS Menus

 The right button has a menu with the following entries to provide

 the sort of character processing expected by non-Plan 9 systems:

--- a/sys/src/cmd/vt/main.c

+++ b/sys/src/cmd/vt/main.c

@@ -135,7 +135,7 @@

 void

 usage(void)

 {

-	fprint(2, "usage: %s [-2abcx] [-f font] [-l logfile]\n", argv0);

+	fprint(2, "usage: %s [-2abcrx] [-f font] [-l logfile]\n", argv0);

 	exits("usage");

 }

@@ -142,6 +142,7 @@

 void

 initialize(int argc, char **argv)

 {

+	int rflag;

 	int i, blkbg;

 	char *fontname, *p;

@@ -151,6 +152,7 @@

 	term = "vt100";

 	fk = vt100fk;

 	blkbg = nocolor = 0;

+	rflag = 0;

 	ARGBEGIN{

 	case '2':

 		term = "vt220";

@@ -179,6 +181,9 @@

 		fk = xtermfk;

 		term = "xterm";

 		break;

+	case 'r':

+		rflag = 1;

+		break;

 	default:

 		usage();

 		break;

@@ -195,6 +200,7 @@

 	werrstr("");		/* clear spurious error messages */

 	ebegin(Ehost);

+	cs->raw = rflag;

 	histp = hist;

 	menu2.item = menutext2;

 	menu3.item = menutext3;