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vt: add OSC 7 support for plumbing of remote files without mount/bind magic

--- a/sys/src/cmd/vt/cons.h

+++ b/sys/src/cmd/vt/cons.h

@@ -10,7 +10,10 @@

 #define	INSET	2

 #define	BUFS	256

 #define	HISTSIZ	(64*1024)	/* number of history characters */

-#define BSIZE	(8*1024)

+#define	BSIZE	(8*1024)

+#define	WDIR	1024

+

+extern char osc7cwd[];

 #define	SCROLL	2

 #define NEWLINE	1

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

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

@@ -1007,13 +1007,30 @@

 void

 plumbsel(void)

 {

-	char *s, wdir[1024];

+	char *s, *e, wdir[WDIR];

+	Plumbmsg msg;

 	int plumb;

 	s = selection();

 	if(s == nil || *s == 0)

 		return;

-	if(getwd(wdir, sizeof wdir) == nil){

+	memset(&msg, 0, sizeof(msg));

+	msg.src = "vt";

+	msg.type = "text";

+	msg.ndata = strlen(s);

+	msg.data = s;

+	msg.wdir = wdir;

+	if(*osc7cwd != 0){

+		strcpy(wdir, osc7cwd);

+		/* absolute path? adjust wdir and path */

+		if(*s == '/'){

+			if((e = strchr(wdir+3, '/')) != nil){

+				*e = 0;

+				msg.data++;

+				msg.ndata--;

+			}

+		}

+	}else if(getwd(wdir, sizeof wdir) == nil){

 		free(s);

 		return;

 	}

@@ -1021,7 +1038,7 @@

 		free(s);

 		return;

 	}

-	plumbsendtext(plumb, "vt", nil, wdir, s);

+	plumbsend(plumb, &msg);

 	close(plumb);

 	free(s);

 }

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

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

@@ -32,6 +32,7 @@

 int	originrelative = 0;

 int	tabcol[200];

+char osc7cwd[WDIR];

 struct funckey ansifk[] = {

 	{ "up key",		"\033[A", },

@@ -952,6 +953,16 @@

 	}

 }

+static int

+hexnib(char c)

+{

+	if(c >= 'a')

+		return c - 'a' + 10;

+	if(c >= 'A')

+		return c - 'A' + 10;

+	return c - '0';

+}

+

 // handle ESC], Operating System Command

 static void

 osc(void)

@@ -958,6 +969,7 @@

 {

 	Rune ch, buf[BUFS+1];

 	int fd, osc, got, i;

+	char *o, *s;

 	osc = number(&ch, &got);

 	if(got) {

@@ -964,8 +976,7 @@

 		switch(osc) {

 		case 0:

 		case 1:

-		case 2:

-			// set title

+		case 2: /* set title */

 			i = 0;

 			while((ch = get_next_char()) != '\a') {

@@ -977,6 +988,33 @@

 			if((fd = open("/dev/label", OWRITE)) >= 0) {

 				fprint(fd, "%S", buf);

 				close(fd);

+			}

+			break;

+

+		case 7: /* set pwd */

+			i = 0;

+

+			while((ch = get_next_char()) != '\033'){

+				if(i < sizeof(osc7cwd)-UTFmax-1)

+					i += runetochar(osc7cwd+i, &ch);

+			}

+			get_next_char();

+			osc7cwd[i] = 0;

+

+			/* file://hostname/path → /n/hostname/path */

+			if(strncmp(osc7cwd, "file://", 7) == 0){

+				osc7cwd[0] = '/';

+				osc7cwd[1] = 'n';

+				o = osc7cwd+2;

+				s = osc7cwd+6;

+				while(*s){

+					if(*s == '%' && s[1] != 0 && s[2] != 0){

+						*o++ = hexnib(s[1])<<4 | hexnib(s[2]);

+						s += 3;

+					}else

+						*o++ = *s++;

+				}

+				*o = 0;

 			}

 			break;

 		}