Add -F to refresh-client to specify flags for control clients - one flag

at the moment, no-output which turns off forwarding pane output. From
Thomas Adam. GitHub issue 1834.

cmd-refresh-client.c

@@ -19,6 +19,7 @@
 #include <sys/types.h>
 
 #include <stdlib.h>
+#include <string.h>
 
 #include "tmux.h"
 
@@ -33,8 +34,9 @@ const struct cmd_entry cmd_refresh_client_entry = {
 	.name = "refresh-client",
 	.alias = "refresh",
 
-	.args = { "cC:DlLRSt:U", 0, 1 },
-	.usage = "[-cDlLRSU] [-C size] " CMD_TARGET_CLIENT_USAGE " [adjustment]",
+	.args = { "cC:DF:lLRSt:U", 0, 1 },
+	.usage = "[-cDlLRSU] [-C XxY] [-F flags] " CMD_TARGET_CLIENT_USAGE
+		" [adjustment]",
 
 	.flags = CMD_AFTERHOOK,
 	.exec = cmd_refresh_client_exec
@@ -48,6 +50,7 @@ cmd_refresh_client_exec(struct cmd *self, struct cmdq_item *item)
 	struct tty	*tty;
 	struct window	*w;
 	const char	*size, *errstr;
+	char		*copy, *next, *s;
 	u_int		 x, y, adjust;
 
 	if ((c = cmd_find_client(item, args_get(args, 't'), 0)) == NULL)
@@ -107,28 +110,43 @@ cmd_refresh_client_exec(struct cmd *self, struct cmdq_item *item)
 	if (args_has(args, 'l')) {
 		if (c->session != NULL)
 			tty_putcode_ptr2(&c->tty, TTYC_MS, "", "?");
-	} else if (args_has(args, 'C')) {
-		if ((size = args_get(args, 'C')) == NULL) {
-			cmdq_error(item, "missing size");
-			return (CMD_RETURN_ERROR);
+		return (CMD_RETURN_NORMAL);
+	}
+
+	if (args_has(args, 'C') || args_has(args, 'F')) {
+		if (args_has(args, 'C')) {
+			if (!(c->flags & CLIENT_CONTROL)) {
+				cmdq_error(item, "not a control client");
+				return (CMD_RETURN_ERROR);
+			}
+			size = args_get(args, 'C');
+			if (sscanf(size, "%u,%u", &x, &y) != 2 &&
+			    sscanf(size, "%ux%u", &x, &y) != 2) {
+				cmdq_error(item, "bad size argument");
+				return (CMD_RETURN_ERROR);
+			}
+			if (x < WINDOW_MINIMUM || x > WINDOW_MAXIMUM ||
+			    y < WINDOW_MINIMUM || y > WINDOW_MAXIMUM) {
+				cmdq_error(item, "size too small or too big");
+				return (CMD_RETURN_ERROR);
+			}
+			tty_set_size(&c->tty, x, y);
+			c->flags |= CLIENT_SIZECHANGED;
+			recalculate_sizes();
 		}
-		if (sscanf(size, "%u,%u", &x, &y) != 2 &&
-		    sscanf(size, "%ux%u", &x, &y)) {
-			cmdq_error(item, "bad size argument");
-			return (CMD_RETURN_ERROR);
+		if (args_has(args, 'F')) {
+			if (!(c->flags & CLIENT_CONTROL)) {
+				cmdq_error(item, "not a control client");
+				return (CMD_RETURN_ERROR);
+			}
+			s = copy = xstrdup(args_get(args, 'F'));
+			while ((next = strsep(&s, ",")) != NULL) {
+				/* Unknown flags are ignored. */
+				if (strcmp(next, "no-output") == 0)
+					c->flags |= CLIENT_CONTROL_NOOUTPUT;
+			}
+			free(copy);
 		}
-		if (x < WINDOW_MINIMUM || x > WINDOW_MAXIMUM ||
-		    y < WINDOW_MINIMUM || y > WINDOW_MAXIMUM) {
-			cmdq_error(item, "size too small or too big");
-			return (CMD_RETURN_ERROR);
-		}
-		if (!(c->flags & CLIENT_CONTROL)) {
-			cmdq_error(item, "not a control client");
-			return (CMD_RETURN_ERROR);
-		}
-		tty_set_size(&c->tty, x, y);
-		c->flags |= CLIENT_SIZECHANGED;
-		recalculate_sizes();
 		return (CMD_RETURN_NORMAL);
 	}
 

control-notify.c

@@ -36,6 +36,9 @@ control_notify_input(struct client *c, struct window_pane *wp,
 	if (c->session == NULL)
 	    return;
 
+	if (c->flags & CLIENT_CONTROL_NOOUTPUT)
+		return;
+
 	/*
 	 * Only write input if the window pane is linked to a window belonging
 	 * to the client's session.

tmux.1

@@ -1162,7 +1162,8 @@ is used, the
 option will not be applied.
 .It Xo Ic refresh-client
 .Op Fl cDlLRSU
-.Op Fl C Ar width,height
+.Op Fl C Ar XxY
+.Op Fl F Ar flags
 .Op Fl t Ar target-client
 .Op Ar adjustment
 .Xc
@@ -1205,7 +1206,13 @@ window, changing the current window in the attached session will reset
 it.
 .Pp
 .Fl C
-sets the width and height of a control client.
+sets the width and height of a control client and
+.Fl F
+sets a comma-separated list of flags.
+Currently the only flag available is
+.Ql no-output
+to disable receiving pane output.
+.Pp
 .Fl l
 requests the clipboard from the client using the
 .Xr xterm 1

tmux.h

@@ -1516,6 +1516,7 @@ struct client {
 #define CLIENT_STATUSOFF 0x800000
 #define CLIENT_REDRAWSTATUSALWAYS 0x1000000
 #define CLIENT_REDRAWOVERLAY 0x2000000
+#define CLIENT_CONTROL_NOOUTPUT 0x4000000
 #define CLIENT_ALLREDRAWFLAGS		\
 	(CLIENT_REDRAWWINDOW|		\
 	 CLIENT_REDRAWSTATUS|		\