Disable UTF-8 by default and add options to enable it.

CHANGES

@@ -1,5 +1,15 @@
 16 November 2008
 
+* New window option: "utf8"; this must be on (it is off by default) for UTF-8
+  to be parsed. The global/session option "utf8-default" controls the setting
+  for new windows.
+
+  This means that by default tmux does not handle UTF-8. To use UTF-8 by
+  default it is necessary to a) "set utf8-default on" in .tmux.conf b) start
+  tmux with -u on any terminal which support UTF-8.
+
+  It seems a bit unnecessary for this to be a per-window option but that is
+  the easiest way to do it, and it can't do any harm...
 * Enable default colours if op contains \033[39;49m, based on a report from
   fulvio ciriaco.
 
@@ -697,4 +707,4 @@
   (including mutt, emacs). No status bar yet and no key remapping or other
   customisation.
 
-$Id: CHANGES,v 1.166 2008-11-16 10:10:26 nicm Exp $
+$Id: CHANGES,v 1.167 2008-11-16 13:28:59 nicm Exp $

cmd-set-option.c

@@ -1,4 +1,4 @@
-/* $Id: cmd-set-option.c,v 1.43 2008-09-26 06:45:25 nicm Exp $ */
+/* $Id: cmd-set-option.c,v 1.44 2008-11-16 13:28:59 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -77,6 +77,7 @@ const struct set_option_entry set_option_table[NSETOPTION] = {
 	{ "status-interval", SET_OPTION_NUMBER, 0, INT_MAX, NULL },
 	{ "status-left", SET_OPTION_STRING, 0, 0, NULL },
 	{ "status-right", SET_OPTION_STRING, 0, 0, NULL },
+	{ "utf8", SET_OPTION_FLAG, 0, 0, NULL },
 };
 
 void	set_option_string(struct cmd_ctx *,

cmd-set-window-option.c

@@ -1,4 +1,4 @@
-/* $Id: cmd-set-window-option.c,v 1.12 2008-09-25 23:28:15 nicm Exp $ */
+/* $Id: cmd-set-window-option.c,v 1.13 2008-11-16 13:28:59 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -181,6 +181,30 @@ cmd_set_window_option_exec(struct cmd *self, struct cmd_ctx *ctx)
 			    s->name, wl->idx, data->option);
 		}
 
+		recalculate_sizes();
+	} else if (strcmp(data->option, "utf8") == 0) {
+		if (flag == -1) {
+			ctx->error(ctx, "bad value: %s", data->value);
+			return;
+		}
+
+		if (flag == -2)
+			wl->window->flags ^= WINDOW_UTF8;
+		else {
+			if (flag)
+				wl->window->flags |= WINDOW_UTF8;
+			else
+				wl->window->flags &= ~WINDOW_UTF8;
+		}
+
+		if (wl->window->flags & WINDOW_UTF8) {
+			ctx->info(ctx, "window %s:%d: set %s",
+			    s->name, wl->idx, data->option);
+		} else {
+			ctx->info(ctx, "window %s:%d: cleared %s",
+			    s->name, wl->idx, data->option);
+		}
+
 		recalculate_sizes();
 	} else if (strcmp(data->option, "force-width") == 0) {
 		if (data->value == NULL || number == -1) {

cmd-show-window-options.c

@@ -1,4 +1,4 @@
-/* $Id: cmd-show-window-options.c,v 1.2 2008-06-29 07:04:30 nicm Exp $ */
+/* $Id: cmd-show-window-options.c,v 1.3 2008-11-16 13:28:59 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -62,6 +62,8 @@ cmd_show_window_options_exec(struct cmd *self, struct cmd_ctx *ctx)
 		ctx->print(ctx, "monitor-activity");
 	if (wl->window->flags & WINDOW_ZOMBIFY)
 		ctx->print(ctx, "remain-on-exit");
+	if (wl->window->flags & WINDOW_UTF8)
+		ctx->print(ctx, "utf8");
 
 	if (ctx->cmdclient != NULL)
 		server_write_client(ctx->cmdclient, MSG_EXIT, NULL, 0);

input.c

@@ -1,4 +1,4 @@
-/* $Id: input.c,v 1.66 2008-11-04 20:41:10 nicm Exp $ */
+/* $Id: input.c,v 1.67 2008-11-16 13:28:59 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -510,7 +510,7 @@ input_state_utf8(u_char ch, struct input_ctx *ictx)
 void
 input_handle_character(u_char ch, struct input_ctx *ictx)
 {
-	if (ch > 0x7f) {
+	if (ictx->w->flags & WINDOW_UTF8 && ch > 0x7f) {
 		/*
 		 * UTF-8 sequence.
 		 *

session.c

@@ -1,4 +1,4 @@
-/* $Id: session.c,v 1.45 2008-11-16 10:10:26 nicm Exp $ */
+/* $Id: session.c,v 1.46 2008-11-16 13:28:59 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -209,6 +209,8 @@ session_new(struct session *s, const char *name, const char *cmd, int idx)
 
 	if (options_get_number(&s->options, "remain-by-default"))
 		w->flags |= WINDOW_ZOMBIFY;
+	if (options_get_number(&s->options, "utf8-default"))
+		w->flags |= WINDOW_UTF8;
 
 	return (session_attach(s, w, idx));
 }

tmux.1

@@ -1,4 +1,4 @@
-.\" $Id: tmux.1,v 1.49 2008-09-25 20:08:56 nicm Exp $
+.\" $Id: tmux.1,v 1.50 2008-11-16 13:28:59 nicm Exp $
 .\"
 .\" Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 .\"
@@ -23,7 +23,7 @@
 .Sh SYNOPSIS
 .Nm tmux
 .Bk -words
-.Op Fl qVv
+.Op Fl 2dquVv
 .Op Fl f Ar file
 .Op Fl S Ar socket-path
 .Op Ar command Op Ar flags
@@ -50,6 +50,14 @@ Communication takes place through a socket, by default placed in
 .Pp
 The options are as follows:
 .Bl -tag -width "XXXXXXXXXXXX"
+.It Fl 2
+Force
+.Nm
+to assume the terminal supports 256 colours.
+.It Fl d
+Force
+.Nm
+to assume the terminal support default colours.
 .It Fl f Ar file
 Specify an alternative configuration file.
 By default,
@@ -70,6 +78,10 @@ where
 .Em UID
 is the uid of the user who invoked
 .Nm .
+.If Fl u
+Intruct
+.Nm
+that the terminal support UTF-8.
 .It Fl V
 Print program version.
 .It Fl v

tmux.c

@@ -1,4 +1,4 @@
-/* $Id: tmux.c,v 1.79 2008-09-29 16:03:27 nicm Exp $ */
+/* $Id: tmux.c,v 1.80 2008-11-16 13:28:59 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -231,6 +231,7 @@ main(int argc, char **argv)
 	options_set_number(&global_options, "buffer-limit", 9);
 	options_set_number(&global_options, "remain-by-default", 0);
 	options_set_number(&global_options, "mode-keys", MODEKEY_EMACS);
+	options_set_number(&global_options, "utf8-default", 0);
 
 	if (cfg_file == NULL) {
 		home = getenv("HOME");

tmux.h

@@ -1,4 +1,4 @@
-/* $Id: tmux.h,v 1.196 2008-11-16 10:10:26 nicm Exp $ */
+/* $Id: tmux.h,v 1.197 2008-11-16 13:28:59 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -569,6 +569,7 @@ struct window {
 #define WINDOW_MONITOR 0x8
 #define WINDOW_AGGRESSIVE 0x10
 #define WINDOW_ZOMBIFY 0x20
+#define WINDOW_UTF8 0x40
 
 	u_int		 limitx;
 	u_int		 limity;

tty.c

@@ -1,4 +1,4 @@
-/* $Id: tty.c,v 1.50 2008-11-16 10:10:26 nicm Exp $ */
+/* $Id: tty.c,v 1.51 2008-11-16 13:28:59 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -888,7 +888,7 @@ tty_cmd_cell(struct tty *tty, unused struct screen *s, va_list ap)
 	tty_attributes(tty, gc);
 
 	/* If not UTF8 multibyte, write directly. */
-	if (gc->data < 0xff) {
+	if (gc->data <= 0xff) {
 		tty_putc(tty, gc->data);
 		return;
 	}