Merge branch 'master' into floating_panes

Makefile.am

@@ -41,6 +41,10 @@ endif
 AM_CPPFLAGS += -DDEBUG
 endif
 AM_CPPFLAGS += -iquote.
+if IS_ASAN
+AM_CFLAGS += -fsanitize=address
+AM_LDFLAGS += -fsanitize=address
+endif
 endif
 
 # Set flags for Solaris.

cmd-copy-mode.c

@@ -64,6 +64,7 @@ cmd_copy_mode_exec(struct cmd *self, struct cmdq_item *item)
 	struct session		*s;
 	struct window_pane	*wp = target->wp, *swp;
 	u_int			 tty_ox, tty_oy, tty_sx, tty_sy;
+	int			 line_numbers;
 
 	if (args_has(args, 'q')) {
 		window_pane_reset_mode_all(wp);
@@ -86,10 +87,15 @@ cmd_copy_mode_exec(struct cmd *self, struct cmdq_item *item)
 		swp = source->wp;
 	else
 		swp = wp;
+	line_numbers = 1;
+	if (event != NULL && KEYC_IS_MOUSE(event->key))
+		line_numbers = 0;
 	if (!window_pane_set_mode(wp, swp, &window_copy_mode, NULL, args)) {
+		window_copy_set_line_numbers(wp, line_numbers);
 		if (args_has(args, 'M'))
 			window_copy_start_drag(c, &event->m);
-	}
+	} else
+		window_copy_set_line_numbers(wp, line_numbers);
 	if (args_has(args, 'u'))
 		window_copy_pageup(wp, 0);
 	if (args_has(args, 'd'))

cmd-join-pane.c

@@ -118,7 +118,7 @@ cmd_join_pane_exec(struct cmd *self, struct cmdq_item *item)
 		size = args_percentage_and_expand(args, 'l', 0, INT_MAX, curval,
 			   item, &cause);
 	} else if (args_has(args, 'p')) {
-		size = args_strtonum_and_expand(args, 'l', 0, 100, item,
+		size = args_strtonum_and_expand(args, 'p', 0, 100, item,
 			   &cause);
 		if (cause == NULL)
 			size = curval * size / 100;

cmd-new-session.c

@@ -102,7 +102,7 @@ cmd_new_session_exec(struct cmd *self, struct cmdq_item *item)
 	tmp = args_get(args, 's');
 	if (tmp != NULL) {
 		name = format_single(item, tmp, c, NULL, NULL, NULL);
-		newname = session_check_name(name);
+		newname = clean_name(name, "#:.");
 		if (newname == NULL) {
 			cmdq_error(item, "invalid session: %s", name);
 			free(name);
@@ -142,7 +142,7 @@ cmd_new_session_exec(struct cmd *self, struct cmdq_item *item)
 		else if (groupwith != NULL)
 			prefix = xstrdup(groupwith->name);
 		else {
-			prefix = session_check_name(group);
+			prefix = clean_name(group, "#:.");
 			if (prefix == NULL) {
 				cmdq_error(item, "invalid session group: %s",
 				    group);

cmd-parse.y

@@ -37,6 +37,8 @@ static void printflike(1,2)	 yyerror(const char *, ...);
 static char			*yylex_token(int);
 static char			*yylex_format(void);
 
+#define CMD_PARSE_MAX_ENVIRON_LEN 16384
+
 struct cmd_parse_scope {
 	int				 flag;
 	TAILQ_ENTRY (cmd_parse_scope)	 entry;
@@ -232,6 +234,10 @@ assignment	: EQUALS
 					flag = flag && scope->flag;
 			}
 
+			if (strlen($1) > CMD_PARSE_MAX_ENVIRON_LEN) {
+				yyerror("environment variable is too long");
+				YYABORT;
+			}
 			if ((~flags & CMD_PARSE_PARSEONLY) && flag)
 				environ_put(global_environ, $1, 0);
 			free($1);
@@ -250,6 +256,10 @@ hidden_assignment : HIDDEN EQUALS
 					flag = flag && scope->flag;
 			}
 
+			if (strlen($2) > CMD_PARSE_MAX_ENVIRON_LEN) {
+				yyerror("environment variable is too long");
+				YYABORT;
+			}
 			if ((~flags & CMD_PARSE_PARSEONLY) && flag)
 				environ_put(global_environ, $2, ENVIRON_HIDDEN);
 			free($2);

cmd-pipe-pane.c

@@ -128,6 +128,8 @@ cmd_pipe_pane_exec(struct cmd *self, struct cmdq_item *item)
 		sigprocmask(SIG_SETMASK, &oldset, NULL);
 		cmdq_error(item, "fork error: %s", strerror(errno));
 
+		close(pipe_fd[0]);
+		close(pipe_fd[1]);
 		free(cmd);
 		return (CMD_RETURN_ERROR);
 	case 0:

cmd-rename-session.c

@@ -52,7 +52,7 @@ cmd_rename_session_exec(struct cmd *self, struct cmdq_item *item)
 	char			*newname, *tmp;
 
 	tmp = format_single_from_target(item, args_string(args, 0));
-	newname = session_check_name(tmp);
+	newname = clean_name(tmp, "#:.");
 	if (newname == NULL) {
 		cmdq_error(item, "invalid session: %s", tmp);
 		free(tmp);

cmd-run-shell.c

@@ -198,8 +198,17 @@ cmd_run_shell_timer(__unused int fd, __unused short events, void* arg)
 		}
 		if (job_run(cmd, 0, NULL, NULL, cdata->s, cdata->cwd, NULL,
 		    cmd_run_shell_callback, cmd_run_shell_free, cdata,
-		    cdata->flags, -1, -1) == NULL)
+		    cdata->flags, -1, -1) == NULL) {
+			if (cdata->item == NULL)
+				status_message_set(c, -1, 1, 0, 0,
+				    "failed to run command: %s", cmd);
+			else {
+				cmdq_error(cdata->item,
+				    "failed to run command: %s", cmd);
+				cmdq_continue(cdata->item);
+			}
 			cmd_run_shell_free(cdata);
+		}
 		return;
 	}
 

compat.h

@@ -463,6 +463,9 @@ int		 utf8proc_wctomb(char *, wchar_t);
 #ifdef NEED_FUZZING
 /* tmux.c */
 #define main __weak main
+#define regcomp(preg, pattern, cflags) (0)
+#define regexec(preg, string, nmatch, pmatch, eflags) (REG_NOMATCH)
+#define regfree(preg) ((void)0)
 #endif
 
 /* getopt.c */

configure.ac

@@ -73,6 +73,15 @@ AC_ARG_ENABLE(
 )
 AM_CONDITIONAL(IS_OPTIMIZED, test "x$enable_optimizations" = xyes)
 
+# Is this --enable-asan?
+AC_ARG_ENABLE(
+	asan,
+	AS_HELP_STRING(--enable-asan, enable ASAN build flags),
+	,
+	enable_asan=no
+)
+AM_CONDITIONAL(IS_ASAN, test "x$enable_asan" = xyes)
+
 # Is this a static build?
 AC_ARG_ENABLE(
 	static,

control.c

@@ -207,10 +207,12 @@ control_free_sub(struct control_state *cs, struct control_sub *csub)
 
 	RB_FOREACH_SAFE(csp, control_sub_panes, &csub->panes, csp1) {
 		RB_REMOVE(control_sub_panes, &csub->panes, csp);
+		free(csp->last);
 		free(csp);
 	}
 	RB_FOREACH_SAFE(csw, control_sub_windows, &csub->windows, csw1) {
 		RB_REMOVE(control_sub_windows, &csub->windows, csw);
+		free(csw->last);
 		free(csw);
 	}
 	free(csub->last);
@@ -298,6 +300,7 @@ control_reset_offsets(struct client *c)
 	struct control_pane	*cp, *cp1;
 
 	RB_FOREACH_SAFE(cp, control_panes, &cs->panes, cp1) {
+		control_discard_pane(c, cp);
 		RB_REMOVE(control_panes, &cs->panes, cp);
 		free(cp);
 	}
@@ -352,6 +355,9 @@ control_set_pane_off(struct client *c, struct window_pane *wp)
 	struct control_pane	*cp;
 
 	cp = control_add_pane(c, wp);
+	control_discard_pane(c, cp);
+	memcpy(&cp->offset, &wp->offset, sizeof cp->offset);
+	memcpy(&cp->queued, &wp->offset, sizeof cp->queued);
 	cp->flags |= CONTROL_PANE_OFF;
 }
 

file.c

@@ -804,7 +804,7 @@ file_read_cancel(struct client_files *files, struct imsg *imsg)
 }
 
 /* Handle a write ready message (server). */
-void
+int
 file_write_ready(struct client_files *files, struct imsg *imsg)
 {
 	struct msg_write_ready	*msg = imsg->data;
@@ -812,19 +812,20 @@ file_write_ready(struct client_files *files, struct imsg *imsg)
 	struct client_file	 find, *cf;
 
 	if (msglen != sizeof *msg)
-		fatalx("bad MSG_WRITE_READY size");
+		return (-1);
 	find.stream = msg->stream;
 	if ((cf = RB_FIND(client_files, files, &find)) == NULL)
-		return;
+		return (0);
 	if (msg->error != 0) {
 		cf->error = msg->error;
 		file_fire_done(cf);
 	} else
 		file_push(cf);
+	return (0);
 }
 
 /* Handle read data message (server). */
-void
+int
 file_read_data(struct client_files *files, struct imsg *imsg)
 {
 	struct msg_read_data	*msg = imsg->data;
@@ -834,10 +835,10 @@ file_read_data(struct client_files *files, struct imsg *imsg)
 	size_t			 bsize = msglen - sizeof *msg;
 
 	if (msglen < sizeof *msg)
-		fatalx("bad MSG_READ_DATA size");
+		return (-1);
 	find.stream = msg->stream;
 	if ((cf = RB_FIND(client_files, files, &find)) == NULL)
-		return;
+		return (0);
 
 	log_debug("file %d read %zu bytes", cf->stream, bsize);
 	if (cf->error == 0 && !cf->closed) {
@@ -847,10 +848,11 @@ file_read_data(struct client_files *files, struct imsg *imsg)
 		} else
 			file_fire_read(cf);
 	}
+	return (0);
 }
 
 /* Handle a read done message (server). */
-void
+int
 file_read_done(struct client_files *files, struct imsg *imsg)
 {
 	struct msg_read_done	*msg = imsg->data;
@@ -858,12 +860,13 @@ file_read_done(struct client_files *files, struct imsg *imsg)
 	struct client_file	 find, *cf;
 
 	if (msglen != sizeof *msg)
-		fatalx("bad MSG_READ_DONE size");
+		return (-1);
 	find.stream = msg->stream;
 	if ((cf = RB_FIND(client_files, files, &find)) == NULL)
-		return;
+		return (0);
 
 	log_debug("file %d read done", cf->stream);
 	cf->error = msg->error;
 	file_fire_done(cf);
+	return (0);
 }

format.c

@@ -120,6 +120,9 @@ format_job_cmp(struct format_job *fj1, struct format_job *fj2)
 /* Limit on recursion. */
 #define FORMAT_LOOP_LIMIT 100
 
+/* Limit on time taken (milliseconds). */
+#define FORMAT_TIME_LIMIT 100
+
 /* Format expand flags. */
 #define FORMAT_EXPAND_TIME 0x1
 #define FORMAT_EXPAND_NOJOBS 0x2
@@ -169,9 +172,11 @@ RB_GENERATE_STATIC(format_entry_tree, format_entry, entry, format_entry_cmp);
 struct format_expand_state {
 	struct format_tree	*ft;
 	u_int			 loop;
+	uint64_t		 start_time;
+	int			 flags;
+
 	time_t			 time;
 	struct tm		 tm;
-	int			 flags;
 };
 
 /* Format modifier. */
@@ -292,6 +297,7 @@ format_copy_state(struct format_expand_state *to,
 	to->time = from->time;
 	memcpy(&to->tm, &from->tm, sizeof to->tm);
 	to->flags = from->flags|flags;
+	to->start_time = from->start_time;
 }
 
 /* Format job update callback. */
@@ -4155,15 +4161,33 @@ found:
 	return (found);
 }
 
+/* Check if format has not taken too long. */
+static int
+format_check_time(struct format_expand_state *es)
+{
+	uint64_t t = get_timer();
+
+	if (t - es->start_time < FORMAT_TIME_LIMIT)
+		return (1);
+	t -= es->start_time;
+
+	format_log(es, "reached time limit (%llu)", (unsigned long long)t);
+	return (0);
+}
+
 /* Unescape escaped characters. */
 static char *
-format_unescape(const char *s)
+format_unescape(struct format_expand_state *es, const char *s)
 {
 	char	*out, *cp;
 	int	 brackets = 0;
 
 	cp = out = xmalloc(strlen(s) + 1);
 	for (; *s != '\0'; s++) {
+		if (!format_check_time(es)){
+			free(out);
+			return (xstrdup(""));
+		}
 		if (*s == '#' && s[1] == '{')
 			brackets++;
 		if (brackets == 0 &&
@@ -4182,13 +4206,17 @@ format_unescape(const char *s)
 
 /* Remove escaped characters. */
 static char *
-format_strip(const char *s)
+format_strip(struct format_expand_state *es, const char *s)
 {
 	char	*out, *cp;
 	int	 brackets = 0;
 
 	cp = out = xmalloc(strlen(s) + 1);
 	for (; *s != '\0'; s++) {
+		if (!format_check_time(es)){
+			free(out);
+			return (xstrdup(""));
+		}
 		if (*s == '#' && s[1] == '{')
 			brackets++;
 		if (*s == '#' && strchr(",#{}:", s[1]) != NULL) {
@@ -4204,13 +4232,16 @@ format_strip(const char *s)
 	return (out);
 }
 
+
 /* Skip until end. */
-const char *
+static const char *
-format_skip(const char *s, const char *end)
+format_skip1(struct format_expand_state *es, const char *s, const char *end)
 {
 	int	brackets = 0;
 
 	for (; *s != '\0'; s++) {
+		if (es != NULL && !format_check_time(es))
+			return (NULL);
 		if (*s == '#' && s[1] == '{')
 			brackets++;
 		if (*s == '#' &&
@@ -4229,6 +4260,13 @@ format_skip(const char *s, const char *end)
 	return (s);
 }
 
+/* Skip until end. */
+const char *
+format_skip(const char *s, const char *end)
+{
+    return (format_skip1(NULL, s, end));
+}
+
 /* Return left and right alternatives separated by commas. */
 static int
 format_choose(struct format_expand_state *es, const char *s, char **left,
@@ -4237,7 +4275,7 @@ format_choose(struct format_expand_state *es, const char *s, char **left,
 	const char	*cp;
 	char		*left0, *right0;
 
-	cp = format_skip(s, ",");
+	cp = format_skip1(es, s, ",");
 	if (cp == NULL)
 		return (-1);
 	left0 = xstrndup(s, cp - s);
@@ -4368,7 +4406,7 @@ format_build_modifiers(struct format_expand_state *es, const char **s,
 
 		/* Single argument with no wrapper character. */
 		if (!ispunct((u_char)cp[1]) || cp[1] == '-') {
-			end = format_skip(cp + 1, ":;");
+			end = format_skip1(es, cp + 1, ":;");
 			if (end == NULL)
 				break;
 
@@ -4391,7 +4429,7 @@ format_build_modifiers(struct format_expand_state *es, const char **s,
 				cp++;
 				break;
 			}
-			end = format_skip(cp + 1, last);
+			end = format_skip1(es, cp + 1, last);
 			if (end == NULL)
 				break;
 			cp++;
@@ -4505,7 +4543,7 @@ format_bool_op_n(struct format_expand_state *es, const char *fmt, int and)
 	cp1 = fmt;
 
 	while (and ? result : !result) {
-		cp2 = format_skip(cp1, ",");
+		cp2 = format_skip1(es, cp1, ",");
 
 		if (cp2 == NULL)
 			raw = xstrdup(cp1);
@@ -5085,7 +5123,7 @@ format_replace(struct format_expand_state *es, const char *key, size_t keylen,
 				else if (fm->argc >= 2 &&
 				    strchr(fm->argv[0], 'f') != NULL) {
 					free(time_format);
-					time_format = format_strip(fm->argv[1]);
+					time_format = format_strip(es, fm->argv[1]);
 				}
 				break;
 			case 'q':
@@ -5201,7 +5239,7 @@ format_replace(struct format_expand_state *es, const char *key, size_t keylen,
 	/* Is this a literal string? */
 	if (modifiers & FORMAT_LITERAL) {
 		format_log(es, "literal string is '%s'", copy);
-		value = format_unescape(copy);
+		value = format_unescape(es, copy);
 		goto done;
 	}
 
@@ -5277,6 +5315,12 @@ format_replace(struct format_expand_state *es, const char *key, size_t keylen,
 		else {
 			value = xstrdup("");
 			for (i = 0; i < nrep; i++) {
+				if (!format_check_time(es)) {
+					free(right);
+					free(left);
+					free(value);
+					goto fail;
+				}
 				xasprintf(&new, "%s%s", value, left);
 				free(value);
 				value = new;
@@ -5348,7 +5392,7 @@ format_replace(struct format_expand_state *es, const char *key, size_t keylen,
 		 */
 		cp = copy + 1;
 		while (1) {
-			cp2 = format_skip(cp, ",");
+			cp2 = format_skip1(es, cp, ",");
 			if (cp2 == NULL) {
 				format_log(es,
 				    "no condition matched in '%s'; using last "
@@ -5383,7 +5427,7 @@ format_replace(struct format_expand_state *es, const char *key, size_t keylen,
 			}
 
 			cp = cp2 + 1;
-			cp2 = format_skip(cp, ",");
+			cp2 = format_skip1(es, cp, ",");
 			if (format_true(found)) {
 				format_log(es, "condition '%s' is true",
 				    condition);
@@ -5551,7 +5595,7 @@ format_expand1(struct format_expand_state *es, const char *fmt)
 	int			 ch, brackets;
 	char			 expanded[8192];
 
-	if (fmt == NULL || *fmt == '\0')
+	if (fmt == NULL || *fmt == '\0' || !format_check_time(es))
 		return (xstrdup(""));
 
 	if (es->loop == FORMAT_LOOP_LIMIT) {
@@ -5633,7 +5677,7 @@ format_expand1(struct format_expand_state *es, const char *fmt)
 			fmt += n + 1;
 			continue;
 		case '{':
-			ptr = format_skip((char *)fmt - 2, "}");
+			ptr = format_skip1(es, (char *)fmt - 2, "}");
 			if (ptr == NULL)
 				break;
 			n = ptr - fmt;
@@ -5656,7 +5700,7 @@ format_expand1(struct format_expand_state *es, const char *fmt)
 				n++;
 			}
 			if (*ptr == '[') {
-				style_end = format_skip(fmt - 2, "]");
+				style_end = format_skip1(es, fmt - 2, "]");
 				format_log(es, "found #*%zu[", n);
 				while (len - off < n + 2) {
 					buf = xreallocarray(buf, 2, len);
@@ -5720,6 +5764,7 @@ format_expand_time(struct format_tree *ft, const char *fmt)
 	memset(&es, 0, sizeof es);
 	es.ft = ft;
 	es.flags = FORMAT_EXPAND_TIME;
+	es.start_time = get_timer();
 	return (format_expand1(&es, fmt));
 }
 
@@ -5732,6 +5777,7 @@ format_expand(struct format_tree *ft, const char *fmt)
 	memset(&es, 0, sizeof es);
 	es.ft = ft;
 	es.flags = 0;
+	es.start_time = get_timer();
 	return (format_expand1(&es, fmt));
 }
 

image-sixel.c

@@ -122,19 +122,13 @@ sixel_set_pixel(struct sixel_image *si, u_int x, u_int y, u_int c)
 static int
 sixel_parse_write(struct sixel_image *si, u_int ch)
 {
-	struct sixel_line	*sl;
 	u_int			 i;
 
-	if (sixel_parse_expand_lines(si, si->dy + 6) != 0)
-		return (1);
-	sl = &si->lines[si->dy];
-
 	for (i = 0; i < 6; i++) {
-		if (sixel_parse_expand_line(si, sl, si->dx + 1) != 0)
+		if (ch & (1 << i)) {
+			if (sixel_set_pixel(si, si->dx, si->dy + i, si->dc))
 				return (1);
-		if (ch & (1 << i))
+		}
-			sl->data[si->dx] = si->dc;
-		sl++;
 	}
 	return (0);
 }

image.c

@@ -53,14 +53,12 @@ image_log(struct image *im, const char* from, const char* fmt, ...)
 static void
 image_free(struct image *im)
 {
-	struct screen	*s = im->s;
-
 	image_log(im, __func__, NULL);
 
 	TAILQ_REMOVE(&all_images, im, all_entry);
 	all_images_count--;
 
-	TAILQ_REMOVE(&s->images, im, entry);
+	TAILQ_REMOVE(im->list, im, entry);
 	sixel_free(im->data);
 	free(im->fallback);
 	free(im);
@@ -137,7 +135,8 @@ image_store(struct screen *s, struct sixel_image *si)
 	image_fallback(&im->fallback, im->sx, im->sy);
 
 	image_log(im, __func__, NULL);
-	TAILQ_INSERT_TAIL(&s->images, im, entry);
+	im->list = &s->images;
+	TAILQ_INSERT_TAIL(im->list, im, entry);
 
 	TAILQ_INSERT_TAIL(&all_images, im, all_entry);
 	if (++all_images_count == MAX_IMAGE_COUNT)

input.c

@@ -2663,13 +2663,10 @@ input_exit_osc(struct input_ctx *ictx)
 		input_osc_4(ictx, p);
 		break;
 	case 7:
-		if (utf8_isvalid(p)) {
+		if (screen_set_path(sctx->s, p) && wp != NULL) {
-			screen_set_path(sctx->s, p);
-			if (wp != NULL) {
 			server_redraw_window_borders(wp->window);
 			server_status_window(wp->window);
 		}
-		}
 		break;
 	case 8:
 		input_osc_8(ictx, p);

key-bindings.c

@@ -474,6 +474,10 @@ key_bindings_init(void)
 		"bind -n MouseDown1Status { if -F '#{&&:#{pane_active},#{!#{pane_minimised_flag}}}' { minimise-pane -t= } { switch-client -t= } }",
 		"bind -n C-MouseDown1Status { swap-window -t@ }",
 
+		/* Mouse button 1 down on default pane-border-format */
+		"bind -n MouseDown1Control9 { display-menu -t= -xM -yM -O -T 'Kill pane #{pane_index}?' 'Yes' 'y' { kill-pane -t= } 'No' 'n' {}}",
+		"bind -n MouseDown1Control8 { resize-pane -Z }",
+
 		/* Mouse wheel down on status line. */
 		"bind -n WheelDownStatus { next-window }",
 
@@ -506,7 +510,7 @@ key_bindings_init(void)
 		"bind -Tcopy-mode C-b { send -X cursor-left }",
 		"bind -Tcopy-mode C-g { send -X clear-selection }",
 		"bind -Tcopy-mode C-k { send -X copy-pipe-end-of-line-and-cancel }",
-		"bind -Tcopy-mode C-l { send -X cursor-centre-vertical }",
+		"bind -Tcopy-mode C-l { send -X recentre-top-bottom }",
 		"bind -Tcopy-mode M-l { send -X cursor-centre-horizontal }",
 		"bind -Tcopy-mode C-n { send -X cursor-down }",
 		"bind -Tcopy-mode C-p { send -X cursor-up }",
@@ -515,6 +519,7 @@ key_bindings_init(void)
 		"bind -Tcopy-mode C-v { send -X page-down }",
 		"bind -Tcopy-mode C-w { send -X copy-pipe-and-cancel }",
 		"bind -Tcopy-mode Escape { send -X cancel }",
+		"bind -Tcopy-mode C-[ { send -X cancel }",
 		"bind -Tcopy-mode Space { send -X page-down }",
 		"bind -Tcopy-mode , { send -X jump-reverse }",
 		"bind -Tcopy-mode \\; { send -X jump-again }",
@@ -588,6 +593,7 @@ key_bindings_init(void)
 		"bind -Tcopy-mode-vi C-v { send -X rectangle-toggle }",
 		"bind -Tcopy-mode-vi C-y { send -X scroll-up }",
 		"bind -Tcopy-mode-vi Escape { send -X clear-selection }",
+		"bind -Tcopy-mode-vi C-[ { send -X clear-selection }",
 		"bind -Tcopy-mode-vi Space { send -X begin-selection }",
 		"bind -Tcopy-mode-vi '$' { send -X end-of-line }",
 		"bind -Tcopy-mode-vi , { send -X jump-reverse }",

layout-custom.c

@@ -183,13 +183,14 @@ layout_parse(struct window *w, const char *layout, char **cause)
 	struct window_pane	*wp;
 	u_int			 npanes, ncells, sx = 0, sy = 0;
 	u_short			 csum;
+	int			 n;
 
 	/* Check validity. */
-	if (sscanf(layout, "%hx,", &csum) != 1) {
+	if (sscanf(layout, "%hx,%n", &csum, &n) != 1 || n != 5) {
 		*cause = xstrdup("invalid layout");
 		return (-1);
 	}
-	layout += 5;
+	layout += n;
 	if (csum != layout_checksum(layout)) {
 		*cause = xstrdup("invalid layout");
 		return (-1);

menu.c

@@ -471,6 +471,7 @@ menu_key_cb(struct client *c, void *data, struct key_event *event)
 	case '\r':
 		goto chosen;
 	case '\033': /* Escape */
+	case '['|KEYC_CTRL:
 	case 'c'|KEYC_CTRL:
 	case 'g'|KEYC_CTRL:
 	case 'q':

mode-tree.c

@@ -301,6 +301,8 @@ mode_tree_clear_tagged(struct mode_tree_list *mtl)
 void
 mode_tree_up(struct mode_tree_data *mtd, int wrap)
 {
+	if (mtd->line_size == 0)
+		return;
 	if (mtd->current == 0) {
 		if (wrap) {
 			mtd->current = mtd->line_size - 1;
@@ -317,6 +319,8 @@ mode_tree_up(struct mode_tree_data *mtd, int wrap)
 int
 mode_tree_down(struct mode_tree_data *mtd, int wrap)
 {
+	if (mtd->line_size == 0)
+		return (0);
 	if (mtd->current == mtd->line_size - 1) {
 		if (wrap) {
 			mtd->current = 0;
@@ -363,6 +367,8 @@ mode_tree_swap(struct mode_tree_data *mtd, int direction)
 void *
 mode_tree_get_current(struct mode_tree_data *mtd)
 {
+	if (mtd->line_size == 0)
+		return (NULL);
 	return (mtd->line_list[mtd->current].item->itemdata);
 }
 
@@ -433,6 +439,8 @@ mode_tree_set_current(struct mode_tree_data *mtd, uint64_t tag)
 		return (1);
 	}
 	if (mtd->current >= mtd->line_size) {
+		if (mtd->line_size == 0)
+			return (0);
 		mtd->current = mtd->line_size - 1;
 		if (mtd->current > mtd->height - 1)
 			mtd->offset = mtd->current - mtd->height + 1;
@@ -1276,6 +1284,7 @@ mode_tree_key(struct mode_tree_data *mtd, struct client *c, key_code *key,
 	switch (*key) {
 	case 'q':
 	case '\033': /* Escape */
+	case '['|KEYC_CTRL:
 	case 'g'|KEYC_CTRL:
 		return (1);
 	case KEYC_F1:

names.c

@@ -166,7 +166,9 @@ parse_window_name(const char *in)
 
 	if (*name == '/')
 		name = basename(name);
-	name = xstrdup(name);
+	name = clean_name(name, "#");
 	free(copy);
+	if (name == NULL)
+		return (xstrdup(""));
 	return (name);
 }

options-table.c

@@ -108,6 +108,9 @@ static const char *options_table_extended_keys_format_list[] = {
 static const char *options_table_allow_passthrough_list[] = {
 	"off", "on", "all", NULL
 };
+static const char *options_table_copy_mode_line_numbers_list[] = {
+	"off", "default", "absolute", "relative", "hybrid", NULL
+};
 
 /* Status line format. */
 #define OPTIONS_TABLE_STATUS_FORMAT1 \
@@ -1176,7 +1179,7 @@ const struct options_table_entry options_table[] = {
 	  .scope = OPTIONS_TABLE_WINDOW|OPTIONS_TABLE_PANE,
 	  .default_str = "#[align=right]"
 			 "#{t/p:top_line_time}#{?#{e|>:#{top_line_time},0}, ,}"
-			 "[#{scroll_position}/#{history_size}]"
+			 "[#{copy_position}/#{copy_position_limit}]"
 			 "#{?search_timed_out, (timed out),"
 			 "#{?search_count, (#{search_count}"
 			 "#{?search_count_partial,+,} results),}}",
@@ -1201,6 +1204,32 @@ const struct options_table_entry options_table[] = {
 	  .text = "Style of selection in copy mode."
 	},
 
+	{ .name = "copy-mode-current-line-number-style",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_WINDOW,
+	  .default_str = "fg=yellow",
+	  .flags = OPTIONS_TABLE_IS_STYLE,
+	  .separator = ",",
+	  .text = "Style of current line number in copy mode."
+	},
+
+	{ .name = "copy-mode-line-number-style",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_WINDOW,
+	  .default_str = "fg=white,dim",
+	  .flags = OPTIONS_TABLE_IS_STYLE,
+	  .separator = ",",
+	  .text = "Style of line numbers in copy mode."
+	},
+
+	{ .name = "copy-mode-line-numbers",
+	  .type = OPTIONS_TABLE_CHOICE,
+	  .scope = OPTIONS_TABLE_WINDOW,
+	  .choices = options_table_copy_mode_line_numbers_list,
+	  .default_num = 0,
+	  .text = "Line number mode in copy mode."
+	},
+
 	{ .name = "fill-character",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW,
@@ -1326,7 +1355,14 @@ const struct options_table_entry options_table[] = {
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW|OPTIONS_TABLE_PANE,
 	  .default_str = "#{?pane_active,#[reverse],}#{pane_index}#[default] "
-			 "\"#{pane_title}\"",
+			 "\"#{pane_title}\""
+			 "#{?#{mouse},"
+				"#[align=right]"
+				"#[range=control|8]["
+					"#{?#{window_zoomed_flag},u,z}"
+				"]#[norange]"
+				"#[range=control|9][x]#[norange]"
+			",}",
 	  .text = "Format of text in the pane status lines."
 	},
 
@@ -1473,6 +1509,28 @@ const struct options_table_entry options_table[] = {
 		  "A value of 0 means no limit."
 	},
 
+	{ .name = "tree-mode-preview-format",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_WINDOW|OPTIONS_TABLE_PANE,
+	  .default_str = "#{?pane_format,"
+			 "#{pane_index}:#{pane_title},"
+			 "#{window_index}:#{window_name}}",
+	  .text = "Format of the preview indicator in tree mode."
+	},
+
+	{ .name = "tree-mode-preview-style",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_WINDOW,
+	  .default_str = "fg=#{?#{||:"
+			 "#{&&:#{pane_format},#{pane_active}},"
+			 "#{&&:#{window_format},#{window_active}}},"
+			 "#{display-panes-active-colour},"
+			 "#{display-panes-colour}}",
+	  .flags = OPTIONS_TABLE_IS_STYLE,
+	  .separator = ",",
+	  .text = "Style of preview indicator in tree mode."
+	},
+
 	{ .name = "window-active-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW|OPTIONS_TABLE_PANE,

paste.c

@@ -204,6 +204,7 @@ int
 paste_rename(const char *oldname, const char *newname, char **cause)
 {
 	struct paste_buffer	*pb, *pb_new;
+	char			*name;
 
 	if (cause != NULL)
 		*cause = NULL;
@@ -219,23 +220,33 @@ paste_rename(const char *oldname, const char *newname, char **cause)
 		return (-1);
 	}
 
+	name = clean_name(newname, "");
+	if (name == NULL) {
+		if (cause != NULL)
+			xasprintf(cause, "invalid buffer name: %s", newname);
+		return (-1);
+	}
+
 	pb = paste_get_name(oldname);
 	if (pb == NULL) {
 		if (cause != NULL)
 			xasprintf(cause, "no buffer %s", oldname);
+		free(name);
 		return (-1);
 	}
 
-	pb_new = paste_get_name(newname);
+	pb_new = paste_get_name(name);
-	if (pb_new == pb)
+	if (pb_new == pb) {
+		free(name);
 		return (0);
+	}
 	if (pb_new != NULL)
 		paste_free(pb_new);
 
 	RB_REMOVE(paste_name_tree, &paste_by_name, pb);
 
 	free(pb->name);
-	pb->name = xstrdup(newname);
+	pb->name = name;
 
 	if (pb->automatic)
 		paste_num_automatic--;
@@ -244,7 +255,7 @@ paste_rename(const char *oldname, const char *newname, char **cause)
 	RB_INSERT(paste_name_tree, &paste_by_name, pb);
 
 	notify_paste_buffer(oldname, 1);
-	notify_paste_buffer(newname, 0);
+	notify_paste_buffer(pb->name, 0);
 
 	return (0);
 }
@@ -257,6 +268,7 @@ int
 paste_set(char *data, size_t size, const char *name, char **cause)
 {
 	struct paste_buffer	*pb, *old;
+	char			*newname;
 
 	if (cause != NULL)
 		*cause = NULL;
@@ -276,9 +288,16 @@ paste_set(char *data, size_t size, const char *name, char **cause)
 		return (-1);
 	}
 
+	newname = clean_name(name, "");
+	if (newname == NULL) {
+		if (cause != NULL)
+			xasprintf(cause, "invalid buffer name: %s", name);
+		return (-1);
+	}
+
 	pb = xmalloc(sizeof *pb);
 
-	pb->name = xstrdup(name);
+	pb->name = newname;
 
 	pb->data = data;
 	pb->size = size;
@@ -288,13 +307,13 @@ paste_set(char *data, size_t size, const char *name, char **cause)
 
 	pb->created = time(NULL);
 
-	if ((old = paste_get_name(name)) != NULL)
+	if ((old = paste_get_name(pb->name)) != NULL)
 		paste_free(old);
 
 	RB_INSERT(paste_name_tree, &paste_by_name, pb);
 	RB_INSERT(paste_time_tree, &paste_by_time, pb);
 
-	notify_paste_buffer(name, 0);
+	notify_paste_buffer(pb->name, 0);
 
 	return (0);
 }

regress/utf8-test.result

@@ -90,7 +90,7 @@ You should see the Greek word 'kosme':       "κόσμε"
 2.3.2  U-0000E000 = ee 80 80 = ""                                            |
 2.3.3  U-0000FFFD = ef bf bd = "<22>"                                            |
 2.3.4  U-0010FFFF = f4 8f bf bf = "􏿿"                                         |
-2.3.5  U-00110000 = f4 90 80 80 = "<22>"                                         |
+2.3.5  U-00110000 = f4 90 80 80 = "<22><EFBFBD><EFBFBD><EFBFBD>"                                         |
                                                                               |
 3  Malformed sequences                                                        |
                                                                               |

screen-redraw.c

@@ -739,7 +739,7 @@ screen_redraw_draw_pane_status(struct screen_redraw_ctx *ctx)
 		if (ctx->statustop)
 			yoff += ctx->statuslines;
 
-		for (i=0; i < r->used; i++) {
+		for (i = 0; i < r->used; i++) {
 			ri = &r->ranges[i];
 			if (ri->nx == 0)
 				continue;

screen.c

@@ -36,6 +36,8 @@ struct screen_sel {
 	u_int		 ex;
 	u_int		 ey;
 
+	u_int		 clipx;
+
 	struct grid_cell cell;
 };
 
@@ -245,19 +247,28 @@ screen_set_cursor_colour(struct screen *s, int colour)
 int
 screen_set_title(struct screen *s, const char *title)
 {
-	if (!utf8_isvalid(title))
+	char	*new_title;
+
+	new_title = clean_name(title, "#");
+	if (new_title == NULL)
 		return (0);
 	free(s->title);
-	s->title = xstrdup(title);
+	s->title = new_title;
 	return (1);
 }
 
 /* Set screen path. */
-void
+int
 screen_set_path(struct screen *s, const char *path)
 {
+	char	*new_path;
+
+	new_path = clean_name(path, "#");
+	if (new_path == NULL)
+		return (0);
 	free(s->path);
-	utf8_stravis(&s->path, path, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
+	s->path = new_path;
+	return (1);
 }
 
 /* Push the current title onto the stack. */
@@ -266,6 +277,16 @@ screen_push_title(struct screen *s)
 {
 	struct screen_title_entry *title_entry;
 
+	log_debug("%s: %u", __func__, s->ntitles);
+
+	while (s->ntitles >= 10) {
+		title_entry = TAILQ_LAST(s->titles, screen_titles);
+		free(title_entry->text);
+		TAILQ_REMOVE(s->titles, title_entry, entry);
+		free(title_entry);
+		s->ntitles--;
+	}
+
 	if (s->titles == NULL) {
 		s->titles = xmalloc(sizeof *s->titles);
 		TAILQ_INIT(s->titles);
@@ -273,6 +294,7 @@ screen_push_title(struct screen *s)
 	title_entry = xmalloc(sizeof *title_entry);
 	title_entry->text = xstrdup(s->title);
 	TAILQ_INSERT_HEAD(s->titles, title_entry, entry);
+	s->ntitles++;
 }
 
 /*
@@ -286,14 +308,15 @@ screen_pop_title(struct screen *s)
 
 	if (s->titles == NULL)
 		return;
+	log_debug("%s: %u", __func__, s->ntitles);
 
 	title_entry = TAILQ_FIRST(s->titles);
 	if (title_entry != NULL) {
-		screen_set_title(s, title_entry->text);
+		free(s->title);
-
+		s->title = title_entry->text;
 		TAILQ_REMOVE(s->titles, title_entry, entry);
-		free(title_entry->text);
 		free(title_entry);
+		s->ntitles--;
 	}
 }
 
@@ -456,7 +479,8 @@ screen_resize_y(struct screen *s, u_int sy, int eat_empty, u_int *cy)
 /* Set selection. */
 void
 screen_set_selection(struct screen *s, u_int sx, u_int sy,
-    u_int ex, u_int ey, u_int rectangle, int modekeys, struct grid_cell *gc)
+    u_int ex, u_int ey, u_int rectangle, u_int clipx, int modekeys,
+    struct grid_cell *gc)
 {
 	if (s->sel == NULL)
 		s->sel = xcalloc(1, sizeof *s->sel);
@@ -470,6 +494,7 @@ screen_set_selection(struct screen *s, u_int sx, u_int sy,
 	s->sel->sy = sy;
 	s->sel->ex = ex;
 	s->sel->ey = ey;
+	s->sel->clipx = clipx;
 }
 
 /* Clear selection. */
@@ -497,6 +522,8 @@ screen_check_selection(struct screen *s, u_int px, u_int py)
 
 	if (sel == NULL || sel->hidden)
 		return (0);
+	if (px < sel->clipx)
+		return (0);
 
 	if (sel->rectangle) {
 		if (sel->sy < sel->ey) {
@@ -649,6 +676,9 @@ void
 screen_alternate_on(struct screen *s, struct grid_cell *gc, int cursor)
 {
 	u_int		 sx, sy;
+#ifdef ENABLE_SIXEL
+	struct image	*im;
+#endif
 
 	if (SCREEN_IS_ALTERNATE(s))
 		return;
@@ -665,6 +695,8 @@ screen_alternate_on(struct screen *s, struct grid_cell *gc, int cursor)
 
 #ifdef ENABLE_SIXEL
 	TAILQ_CONCAT(&s->saved_images, &s->images, entry);
+	TAILQ_FOREACH(im, &s->saved_images, entry)
+	    im->list = &s->saved_images;
 #endif
 
 	grid_view_clear(s->grid, 0, 0, sx, sy, 8);
@@ -678,6 +710,9 @@ void
 screen_alternate_off(struct screen *s, struct grid_cell *gc, int cursor)
 {
 	u_int		 sx = screen_size_x(s), sy = screen_size_y(s);
+#ifdef ENABLE_SIXEL
+	struct image	*im;
+#endif
 
 	/*
 	 * If the current size is different, temporarily resize to the old size
@@ -724,6 +759,8 @@ screen_alternate_off(struct screen *s, struct grid_cell *gc, int cursor)
 #ifdef ENABLE_SIXEL
 	image_free_all(s);
 	TAILQ_CONCAT(&s->images, &s->saved_images, entry);
+	TAILQ_FOREACH(im, &s->images, entry)
+	    im->list = &s->images;
 #endif
 
 	if (s->cx > screen_size_x(s) - 1)
@@ -762,6 +799,8 @@ screen_mode_to_string(int mode)
 		strlcat(tmp, "CURSOR_BLINKING,", sizeof tmp);
 	if (mode & MODE_CURSOR_VERY_VISIBLE)
 		strlcat(tmp, "CURSOR_VERY_VISIBLE,", sizeof tmp);
+	if (mode & MODE_CURSOR_BLINKING_SET)
+		strlcat(tmp, "CURSOR_BLINKING_SET,", sizeof tmp);
 	if (mode & MODE_MOUSE_UTF8)
 		strlcat(tmp, "MOUSE_UTF8,", sizeof tmp);
 	if (mode & MODE_MOUSE_SGR)
@@ -782,6 +821,9 @@ screen_mode_to_string(int mode)
 		strlcat(tmp, "KEYS_EXTENDED_2,", sizeof tmp);
 	if (mode & MODE_THEME_UPDATES)
 		strlcat(tmp, "THEME_UPDATES,", sizeof tmp);
+	if (mode & MODE_SYNC)
+		strlcat(tmp, "SYNC,", sizeof tmp);
+	if (*tmp != '\0')
 		tmp[strlen(tmp) - 1] = '\0';
 	return (tmp);
 }

server-client.c

@@ -41,6 +41,7 @@ static void	server_client_check_redraw(struct client *);
 static void	server_client_check_modes(struct client *);
 static void	server_client_set_title(struct client *);
 static void	server_client_set_path(struct client *);
+static void	server_client_set_progress_bar(struct client *);
 static void	server_client_reset_state(struct client *);
 static void	server_client_update_latest(struct client *);
 static void	server_client_dispatch(struct imsg *, void *);
@@ -2142,6 +2143,7 @@ server_client_check_redraw(struct client *c)
 			server_client_set_title(c);
 			server_client_set_path(c);
 		}
+		server_client_set_progress_bar(c);
 		screen_redraw_screen(c);
 	}
 
@@ -2208,6 +2210,23 @@ server_client_set_path(struct client *c)
 	}
 }
 
+/* Set client progress bar. */
+static void
+server_client_set_progress_bar(struct client *c)
+{
+	struct session		*s = c->session;
+	struct progress_bar	*pane_pb;
+
+	if (s->curw == NULL)
+		return;
+	pane_pb = &s->curw->window->active->base.progress_bar;
+	if (pane_pb->state == c->progress_bar.state &&
+	    pane_pb->progress == c->progress_bar.progress)
+		return;
+	memcpy(&c->progress_bar, pane_pb, sizeof c->progress_bar);
+	tty_set_progress_bar(&c->tty, &c->progress_bar);
+}
+
 /* Dispatch message from client. */
 static void
 server_client_dispatch(struct imsg *imsg, void *arg)
@@ -2302,13 +2321,16 @@ server_client_dispatch(struct imsg *imsg, void *arg)
 			goto bad;
 		break;
 	case MSG_WRITE_READY:
-		file_write_ready(&c->files, imsg);
+		if (file_write_ready(&c->files, imsg) != 0)
+			goto bad;
 		break;
 	case MSG_READ:
-		file_read_data(&c->files, imsg);
+		if (file_read_data(&c->files, imsg) != 0)
+			goto bad;
 		break;
 	case MSG_READ_DONE:
-		file_read_done(&c->files, imsg);
+		if (file_read_done(&c->files, imsg) != 0)
+			goto bad;
 		break;
 	}
 

session.c

@@ -229,24 +229,6 @@ session_destroy(struct session *s, int notify, const char *from)
 	session_remove_ref(s, __func__);
 }
 
-/* Sanitize session name. */
-char *
-session_check_name(const char *name)
-{
-	char	*copy, *cp, *new_name;
-
-	if (*name == '\0')
-		return (NULL);
-	copy = xstrdup(name);
-	for (cp = copy; *cp != '\0'; cp++) {
-		if (*cp == ':' || *cp == '.')
-			*cp = '_';
-	}
-	utf8_stravis(&new_name, copy, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
-	free(copy);
-	return (new_name);
-}
-
 /* Lock session if it has timed out. */
 static void
 session_lock_timer(__unused int fd, __unused short events, void *arg)

spawn.c

@@ -82,6 +82,7 @@ spawn_window(struct spawn_context *sc, char **cause)
 	struct winlink		*wl;
 	int			 idx = sc->idx;
 	u_int			 sx, sy, xpixel, ypixel;
+	char			*name;
 
 	spawn_log(__func__, sc);
 
@@ -180,8 +181,11 @@ spawn_window(struct spawn_context *sc, char **cause)
 	if (~sc->flags & SPAWN_RESPAWN) {
 		free(w->name);
 		if (sc->name != NULL) {
-			w->name = format_single(item, sc->name, c, s, NULL,
+			name = format_single(item, sc->name, c, s, NULL, NULL);
-			    NULL);
+			w->name = clean_name(name, "#");
+			free(name);
+			if (w->name == NULL)
+				w->name = xstrdup("");
 			options_set_number(w->options, "automatic-rename", 0);
 		} else
 			w->name = default_window_name(w);

status.c

@@ -689,10 +689,13 @@ status_prompt_set(struct client *c, struct cmd_find_state *fs,
 
 	server_client_clear_overlay(c);
 
-	if (fs != NULL)
+	if (fs != NULL) {
 		ft = format_create_from_state(NULL, c, fs);
-	else
+		cmd_find_copy_state(&c->prompt_state, fs);
+	} else {
 		ft = format_create_defaults(NULL, c, NULL, NULL, NULL);
+		cmd_find_clear_state(&c->prompt_state, 0);
+	}
 
 	if (input == NULL)
 		input = "";
@@ -701,7 +704,6 @@ status_prompt_set(struct client *c, struct cmd_find_state *fs,
 	status_prompt_clear(c);
 	status_push_screen(c);
 
-	c->prompt_formats = ft;
 	c->prompt_string = xstrdup (msg);
 
 	if (flags & PROMPT_NOFORMAT)
@@ -737,6 +739,7 @@ status_prompt_set(struct client *c, struct cmd_find_state *fs,
 
 	if ((flags & PROMPT_SINGLE) && (flags & PROMPT_ACCEPT))
 		cmdq_append(c, cmdq_get_callback(status_prompt_accept, c));
+	format_free(ft);
 }
 
 /* Remove status line prompt. */
@@ -752,9 +755,6 @@ status_prompt_clear(struct client *c)
 	free(c->prompt_last);
 	c->prompt_last = NULL;
 
-	format_free(c->prompt_formats);
-	c->prompt_formats = NULL;
-
 	free(c->prompt_string);
 	c->prompt_string = NULL;
 
@@ -774,13 +774,19 @@ status_prompt_clear(struct client *c)
 void
 status_prompt_update(struct client *c, const char *msg, const char *input)
 {
+	struct format_tree	*ft;
 	char			*tmp;
 
+	if (cmd_find_valid_state(&c->prompt_state))
+ 		ft = format_create_from_state(NULL, c, &c->prompt_state);
+	else
+ 		ft = format_create_defaults(NULL, c, NULL, NULL, NULL);
+
 	free(c->prompt_string);
 	c->prompt_string = xstrdup(msg);
 
 	free(c->prompt_buffer);
-	tmp = format_expand_time(c->prompt_formats, input);
+	tmp = format_expand_time(ft, input);
 	c->prompt_buffer = utf8_fromcstr(tmp);
 	c->prompt_index = utf8_strlen(c->prompt_buffer);
 	free(tmp);
@@ -788,6 +794,7 @@ status_prompt_update(struct client *c, const char *msg, const char *input)
 	memset(c->prompt_hindex, 0, sizeof c->prompt_hindex);
 
 	c->flags |= CLIENT_REDRAWSTATUS;
+	format_free(ft);
 }
 
 /* Redraw character. Return 1 if can continue redrawing, 0 otherwise. */
@@ -846,11 +853,13 @@ status_prompt_redraw(struct client *c)
 	struct status_line	*sl = &c->status;
 	struct screen_write_ctx	 ctx;
 	struct session		*s = c->session;
+	struct options		*oo = s->options;
 	struct screen		 old_screen;
 	u_int			 i, lines, offset, left, start, width, n;
 	u_int			 pcursor, pwidth, promptline;
 	u_int			 ax, aw;
 	struct grid_cell	 gc;
+	struct format_tree	*ft;
 	const char		*msgfmt;
 	char			*expanded, *prompt, *tmp;
 
@@ -863,12 +872,17 @@ status_prompt_redraw(struct client *c)
 		lines = 1;
 	screen_init(sl->active, c->tty.sx, lines, 0);
 
+	if (cmd_find_valid_state(&c->prompt_state))
+ 		ft = format_create_from_state(NULL, c, &c->prompt_state);
+	else
+ 		ft = format_create_defaults(NULL, c, NULL, NULL, NULL);
+
 	n = options_get_number(s->options, "prompt-cursor-colour");
 	sl->active->default_ccolour = n;
 	if (c->prompt_mode == PROMPT_COMMAND)
-		n = options_get_number(s->options, "prompt-command-cursor-style");
+		n = options_get_number(oo, "prompt-command-cursor-style");
 	else
-		n = options_get_number(s->options, "prompt-cursor-style");
+		n = options_get_number(oo, "prompt-cursor-style");
 	screen_set_cursor_style(n, &sl->active->default_cstyle,
 	    &sl->active->default_mode);
 
@@ -877,28 +891,29 @@ status_prompt_redraw(struct client *c)
 		promptline = lines - 1;
 
 	if (c->prompt_mode == PROMPT_COMMAND)
-		style_apply(&gc, s->options, "message-command-style", NULL);
+		style_apply(&gc, oo, "message-command-style", NULL);
 	else
-		style_apply(&gc, s->options, "message-style", NULL);
+		style_apply(&gc, oo, "message-style", NULL);
 
 	status_prompt_area(c, &ax, &aw);
 
 	tmp = utf8_tocstr(c->prompt_buffer);
-	format_add(c->prompt_formats, "prompt-input", "%s", tmp);
+	format_add(ft, "prompt-input", "%s", tmp);
-	prompt = format_expand_time(c->prompt_formats, c->prompt_string);
+	prompt = format_expand_time(ft, c->prompt_string);
 	free(tmp);
 
 	/*
 	 * Set #{message} to the prompt string and expand message-format.
 	 * format_draw handles fill, alignment, and decorations in one call.
 	 */
-	format_add(c->prompt_formats, "message", "%s", prompt);
+	format_add(ft, "message", "%s", prompt);
-	format_add(c->prompt_formats, "command_prompt", "%d",
+	format_add(ft, "command_prompt", "%d",
 	    c->prompt_mode == PROMPT_COMMAND);
-	msgfmt = options_get_string(s->options, "message-format");
+	msgfmt = options_get_string(oo, "message-format");
-	expanded = format_expand_time(c->prompt_formats, msgfmt);
+	expanded = format_expand_time(ft, msgfmt);
+	free(prompt);
 
-	start = format_width(prompt);
+	start = format_width(expanded);
 	if (start > aw)
 		start = aw;
 
@@ -972,6 +987,49 @@ status_prompt_space(const struct utf8_data *ud)
 	return (*ud->data == ' ');
 }
 
+static key_code
+status_prompt_keypad_key(key_code key)
+{
+	if (key & KEYC_MASK_MODIFIERS)
+		return (key);
+
+	switch (key) {
+	case KEYC_KP_SLASH:
+		return ('/');
+	case KEYC_KP_STAR:
+		return ('*');
+	case KEYC_KP_MINUS:
+		return ('-');
+	case KEYC_KP_SEVEN:
+		return ('7');
+	case KEYC_KP_EIGHT:
+		return ('8');
+	case KEYC_KP_NINE:
+		return ('9');
+	case KEYC_KP_PLUS:
+		return ('+');
+	case KEYC_KP_FOUR:
+		return ('4');
+	case KEYC_KP_FIVE:
+		return ('5');
+	case KEYC_KP_SIX:
+		return ('6');
+	case KEYC_KP_ONE:
+		return ('1');
+	case KEYC_KP_TWO:
+		return ('2');
+	case KEYC_KP_THREE:
+		return ('3');
+	case KEYC_KP_ENTER:
+		return ('\r');
+	case KEYC_KP_ZERO:
+		return ('0');
+	case KEYC_KP_PERIOD:
+		return ('.');
+	}
+	return (key);
+}
+
 /*
  * Translate key from vi to emacs. Return 0 to drop key, 1 to process the key
  * as an emacs key; return 2 to append to the buffer.
@@ -1010,6 +1068,7 @@ status_prompt_translate_key(struct client *c, key_code key, key_code *new_key)
 			*new_key = key;
 			return (1);
 		case '\033': /* Escape */
+		case '['|KEYC_CTRL:
 			c->prompt_mode = PROMPT_COMMAND;
 			if (c->prompt_index != 0)
 				c->prompt_index--;
@@ -1042,6 +1101,7 @@ status_prompt_translate_key(struct client *c, key_code key, key_code *new_key)
 		c->flags |= CLIENT_REDRAWSTATUS;
 		return (0);
 	case '\033': /* Escape */
+	case '['|KEYC_CTRL:
 		return (0);
 	}
 
@@ -1383,6 +1443,9 @@ status_prompt_key(struct client *c, key_code key)
 	}
 	size = utf8_strlen(c->prompt_buffer);
 
+	key &= ~KEYC_MASK_FLAGS;
+	key = status_prompt_keypad_key(key);
+
 	if (c->prompt_flags & PROMPT_NUMERIC) {
 		if (key >= '0' && key <= '9')
 			goto append_key;
@@ -1392,7 +1455,6 @@ status_prompt_key(struct client *c, key_code key)
 		free(s);
 		return (1);
 	}
-	key &= ~KEYC_MASK_FLAGS;
 
 	if (c->prompt_flags & (PROMPT_SINGLE|PROMPT_QUOTENEXT)) {
 		if ((key & KEYC_MASK_KEY) == KEYC_BSPACE)
@@ -1607,6 +1669,7 @@ process_key:
 		free(s);
 		break;
 	case '\033': /* Escape */
+	case '['|KEYC_CTRL:
 	case 'c'|KEYC_CTRL:
 	case 'g'|KEYC_CTRL:
 		if (c->prompt_inputcb(c, c->prompt_data, NULL, 1) == 0)

tmux.1

@@ -2228,6 +2228,11 @@ Turn off rectangle selection mode.
 .Xc
 Toggle rectangle selection mode.
 .It Xo
+.Ic recentre\-top\-bottom
+(emacs : C-l)
+.Xc
+Cycles the current line between centre, top, and bottom.
+.It Xo
 .Ic refresh\-from\-pane
 (vi: r)
 (emacs: r)
@@ -4664,6 +4669,8 @@ mouse sequences.
 Supports the OSC 7 working directory extension.
 .It overline
 Supports the overline SGR attribute.
+.It progressbar
+Supports the OSC 9;4 progress bar extension.
 .It rectfill
 Supports the DECFRA rectangle fill escape sequence.
 .It RGB
@@ -5357,17 +5364,6 @@ section.
 .It Ic copy\-mode\-position\-format Ar format
 Format of the position indicator in copy mode.
 .Pp
-.It Xo Ic mode\-keys
-.Op Ic vi | emacs
-.Xc
-Use vi or emacs-style key bindings in copy mode.
-The default is emacs, unless
-.Ev VISUAL
-or
-.Ev EDITOR
-contains
-.Ql vi .
-.Pp
 .It Ic copy\-mode\-position\-style Ar style
 Set the style of the position indicator in copy mode.
 For how to specify
@@ -5384,6 +5380,63 @@ see the
 .Sx STYLES
 section.
 .Pp
+.It Ic copy\-mode\-current\-line\-number\-style Ar style
+Set style of current line number in copy mode.
+For how to specify
+.Ar style ,
+see the
+.Sx STYLES
+section.
+.Pp
+.It Ic copy\-mode\-line\-number\-style Ar style
+Set style of line numbers in copy mode.
+For how to specify
+.Ar style ,
+see the
+.Sx STYLES
+section.
+.Pp
+.It Xo Ic copy\-mode\-line\-numbers
+.Op Ic off | default | absolute | relative | hybrid
+.Xc
+Show line numbers in copy mode.
+.Ic off
+hides line numbers,
+.Ic default
+shows line numbers matching the copy mode position indicator and
+.Ic goto\-line ,
+.Ic absolute
+shows absolute line numbers,
+.Ic relative
+shows line numbers relative to the cursor, and
+.Ic hybrid
+shows the current line number as absolute and other line numbers as
+relative.
+With
+.Ic off
+or
+.Ic default ,
+the position indicator and
+.Ic goto\-line
+use the same numbering;
+with
+.Ic absolute ,
+.Ic relative
+and
+.Ic hybrid ,
+they use absolute line numbers.
+.Pp
+.It Xo Ic mode\-keys
+.Op Ic vi | emacs
+.Xc
+Use vi or emacs-style key bindings in copy mode.
+The default is emacs, unless
+.Ev VISUAL
+or
+.Ev EDITOR
+contains
+.Ql vi .
+.Pp
 .It Ic mode\-style Ar style
 Set window modes style.
 For how to specify
@@ -5628,6 +5681,17 @@ A value of 0 (the default) means no limit.
 When a limit is set, panes are arranged to not exceed this number of columns,
 with additional panes stacked in extra rows.
 .Pp
+.It Ic tree\-mode\-preview\-format Ar format
+Format of the preview indicator in tree mode.
+.Pp
+.It Ic tree\-mode\-preview\-style Ar style
+Set the style of the preview indicator in tree mode.
+For how to specify
+.Ar style ,
+see the
+.Sx STYLES
+section.
+.Pp
 .It Ic window\-status\-activity\-style Ar style
 Set status line style for windows with an activity alert.
 For how to specify
@@ -6533,6 +6597,8 @@ The following variables are available, where appropriate:
 .It Li "copy_cursor_word" Ta "" Ta "Word under cursor in copy mode"
 .It Li "copy_cursor_x" Ta "" Ta "Cursor X position in copy mode"
 .It Li "copy_cursor_y" Ta "" Ta "Cursor Y position in copy mode"
+.It Li "copy_position" Ta "" Ta "Position shown in the copy mode indicator"
+.It Li "copy_position_limit" Ta "" Ta "Limit shown in the copy mode indicator"
 .It Li "current_file" Ta "" Ta "Current configuration file"
 .It Li "cursor_character" Ta "" Ta "Character at cursor in pane"
 .It Li "cursor_colour" Ta "" Ta "Cursor colour in pane"
@@ -7493,7 +7559,6 @@ Display a popup running
 when omitted) on
 .Ar target\-client .
 A popup is a rectangular box drawn over the top of any panes.
-Panes are not updated while a popup is present.
 If the command is run inside an existing popup, that popup is modified.
 Only the
 .Fl b ,
@@ -8081,6 +8146,8 @@ $ printf \[aq]\e033[4 q\[aq]
 If
 .Em Se
 is not set, \&Ss with argument 0 will be used to reset the cursor style instead.
+.It Em \&Spb
+Set the state and progress for the OSC9;4 progress bar.
 .It Em \&Swd
 Set the opening sequence for the working directory notification.
 The sequence is terminated using the standard

tmux.c

@@ -281,6 +281,23 @@ get_timer(void)
 	return ((ts.tv_sec * 1000ULL) + (ts.tv_nsec / 1000000ULL));
 }
 
+char *
+clean_name(const char *name, const char* forbid)
+{
+	char	*copy, *cp, *new_name;
+
+	if (*name == '\0' || !utf8_isvalid(name))
+		return (NULL);
+	copy = xstrdup(name);
+	for (cp = copy; *cp != '\0'; cp++) {
+		if (strchr(forbid, *cp) != NULL)
+			*cp = '_';
+	}
+	utf8_stravis(&new_name, copy, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
+	free(copy);
+	return (new_name);
+}
+
 const char *
 sig2name(int signo)
 {

tmux.h

@@ -638,6 +638,7 @@ enum tty_code_code {
 	TTYC_SMUL,
 	TTYC_SMULX,
 	TTYC_SMXX,
+	TTYC_SPB,
 	TTYC_SXL,
 	TTYC_SS,
 	TTYC_SWD,
@@ -970,8 +971,10 @@ struct image {
 	u_int			 sx;
 	u_int			 sy;
 
-	TAILQ_ENTRY (image)	 all_entry;
+	struct images		*list;
 	TAILQ_ENTRY (image)	 entry;
+
+	TAILQ_ENTRY (image)	 all_entry;
 };
 TAILQ_HEAD(images, image);
 #endif
@@ -1005,6 +1008,7 @@ struct screen {
 	char				*title;
 	char				*path;
 	struct screen_titles		*titles;
+	u_int				 ntitles;
 
 	struct grid			*grid;	  /* grid data */
 
@@ -2035,6 +2039,7 @@ struct client {
 	char			*title;
 	char			*path;
 	const char		*cwd;
+	struct progress_bar	 progress_bar;
 
 	char			*term_name;
 	int			 term_features;
@@ -2144,8 +2149,8 @@ struct client {
 	struct event		 message_timer;
 
 	char			*prompt_string;
-	struct format_tree	*prompt_formats;
 	struct utf8_data	*prompt_buffer;
+	struct cmd_find_state	 prompt_state;
 	char			*prompt_last;
 	size_t			 prompt_index;
 	prompt_input_cb		 prompt_inputcb;
@@ -2380,6 +2385,7 @@ int		 checkshell(const char *);
 void		 setblocking(int, int);
 char 		*shell_argv0(const char *, int);
 uint64_t	 get_timer(void);
+char		*clean_name(const char *, const char *);
 const char	*sig2name(int);
 const char	*find_cwd(void);
 const char	*find_home(void);
@@ -2674,6 +2680,7 @@ void	tty_repeat_requests(struct tty *, int);
 void	tty_stop_tty(struct tty *);
 void	tty_set_title(struct tty *, const char *);
 void	tty_set_path(struct tty *, const char *);
+void	tty_set_progress_bar(struct tty *, struct progress_bar *);
 void	tty_default_attributes(struct tty *, const struct grid_cell *,
 	    struct colour_palette *, u_int, struct hyperlinks *);
 void	tty_update_mode(struct tty *, int, struct screen *);
@@ -3009,9 +3016,9 @@ void	 file_write_data(struct client_files *, struct imsg *);
 void	 file_write_close(struct client_files *, struct imsg *);
 void	 file_read_open(struct client_files *, struct tmuxpeer *, struct imsg *,
 	     int, int, client_file_cb, void *);
-void	 file_write_ready(struct client_files *, struct imsg *);
+int	 file_write_ready(struct client_files *, struct imsg *);
-void	 file_read_data(struct client_files *, struct imsg *);
+int	 file_read_data(struct client_files *, struct imsg *);
-void	 file_read_done(struct client_files *, struct imsg *);
+int	 file_read_done(struct client_files *, struct imsg *);
 void	 file_read_cancel(struct client_files *, struct imsg *);
 
 /* server.c */
@@ -3353,14 +3360,14 @@ void	 screen_set_default_cursor(struct screen *, struct options *);
 void	 screen_set_cursor_style(u_int, enum screen_cursor_style *, int *);
 void	 screen_set_cursor_colour(struct screen *, int);
 int	 screen_set_title(struct screen *, const char *);
-void	 screen_set_path(struct screen *, const char *);
+int	 screen_set_path(struct screen *, const char *);
 void	 screen_push_title(struct screen *);
 void	 screen_pop_title(struct screen *);
 void	 screen_set_progress_bar(struct screen *, enum progress_bar_state, int);
 void	 screen_resize(struct screen *, u_int, u_int, int);
 void	 screen_resize_cursor(struct screen *, u_int, u_int, int, int, int);
 void	 screen_set_selection(struct screen *, u_int, u_int, u_int, u_int,
-	     u_int, int, struct grid_cell *);
+	     u_int, u_int, int, struct grid_cell *);
 void	 screen_clear_selection(struct screen *);
 void	 screen_hide_selection(struct screen *);
 int	 screen_check_selection(struct screen *, u_int, u_int);
@@ -3605,6 +3612,7 @@ char		*window_copy_get_line(struct window_pane *, u_int);
 int		 window_copy_get_current_offset(struct window_pane *, u_int *,
 		     u_int *);
 char		*window_copy_get_hyperlink(struct window_pane *, u_int, u_int);
+void		 window_copy_set_line_numbers(struct window_pane *, int);
 
 /* window-option.c */
 extern const struct window_mode window_customize_mode;
@@ -3666,7 +3674,6 @@ struct session	*session_create(const char *, const char *, const char *,
 void		 session_destroy(struct session *, int,	 const char *);
 void		 session_add_ref(struct session *, const char *);
 void		 session_remove_ref(struct session *, const char *);
-char		*session_check_name(const char *);
 void		 session_update_activity(struct session *, struct timeval *);
 struct session	*session_next_session(struct session *, struct sort_criteria *);
 struct session	*session_previous_session(struct session *,

tty-features.c

@@ -357,6 +357,17 @@ static const struct tty_feature tty_feature_sixel = {
 	TERM_SIXEL
 };
 
+/* Terminal supports the OSC 9;4 progress bar. */
+static const char *const tty_feature_progressbar_capabilities[] = {
+	"Spb=\\E]9;4;%p1%d;%p2%d\\E\\\\",
+	NULL
+};
+static const struct tty_feature tty_feature_progressbar = {
+	"progressbar",
+	tty_feature_progressbar_capabilities,
+	0
+};
+
 /* Available terminal features. */
 static const struct tty_feature *const tty_features[] = {
 	&tty_feature_256,
@@ -372,6 +383,7 @@ static const struct tty_feature *const tty_features[] = {
 	&tty_feature_mouse,
 	&tty_feature_osc7,
 	&tty_feature_overline,
+	&tty_feature_progressbar,
 	&tty_feature_rectfill,
 	&tty_feature_rgb,
 	&tty_feature_sixel,
@@ -490,7 +502,8 @@ tty_default_features(int *feat, const char *name, u_int version)
 			      "focus,"
 			      "overline,"
 			      "usstyle,"
-		              "hyperlinks"
+			      "hyperlinks,"
+		  	      "progressbar"
 		},
 		{ .name = "rxvt-unicode",
 		  .features = "256,"
@@ -508,13 +521,23 @@ tty_default_features(int *feat, const char *name, u_int version)
 			      "margins,"
 			      "usstyle,"
 			      "sync,"
-		              "osc7,hyperlinks"
+			      "osc7,"
+			      "hyperlinks,"
+		  	      "progressbar"
 		},
 		{ .name = "foot",
 		  .features = TTY_FEATURES_BASE_MODERN_XTERM ","
 			      "cstyle,"
 			      "extkeys"
 		},
+		{ .name = "WezTerm",
+		  .features = TTY_FEATURES_BASE_MODERN_XTERM ","
+			      "ccolour,"
+			      "cstyle,"
+			      "extkeys,"
+			      "focus,"
+			      "usstyle"
+		},
 		{ .name = "XTerm",
 		  /*
 		   * xterm also supports DECSLRM and DECFRA, but they can be

tty-keys.c

@@ -1640,6 +1640,8 @@ tty_keys_extended_device_attributes(struct tty *tty, const char *buf,
 		tty_default_features(features, "mintty", 0);
 	else if (strncmp(tmp, "foot(", 5) == 0)
 		tty_default_features(features, "foot", 0);
+	else if (strncmp(tmp, "WezTerm ", 7) == 0)
+		tty_default_features(features, "WezTerm", 0);
 	log_debug("%s: received extended DA %.*s", c->name, (int)*size, buf);
 
 	free(c->term_type);

tty-term.c

@@ -280,6 +280,7 @@ static const struct tty_term_code_entry tty_term_codes[] = {
 	[TTYC_SMULX] = { TTYCODE_STRING, "Smulx" },
 	[TTYC_SMUL] = { TTYCODE_STRING, "smul" },
 	[TTYC_SMXX] =  { TTYCODE_STRING, "smxx" },
+	[TTYC_SPB] = { TTYCODE_STRING, "Spb" },
 	[TTYC_SS] = { TTYCODE_STRING, "Ss" },
 	[TTYC_SWD] = { TTYCODE_STRING, "Swd" },
 	[TTYC_SYNC] = { TTYCODE_STRING, "Sync" },

tty.c

@@ -3315,3 +3315,10 @@ tty_clipboard_query(struct tty *tty)
 		evtimer_add(&tty->clipboard_timer, &tv);
 	}
 }
+
+void
+tty_set_progress_bar(struct tty *tty, struct progress_bar *pb)
+{
+	if (tty_term_has(tty->term, TTYC_SPB))
+		tty_putcode_ii(tty, TTYC_SPB, pb->state, pb->progress);
+}

window-clock.c

@@ -279,6 +279,7 @@ window_clock_draw_screen(struct window_mode_entry *wme)
 	memcpy(&gc, &grid_default_cell, sizeof gc);
 	gc.flags |= GRID_FLAG_NOPALETTE;
 	gc.bg = colour;
+	gc.fg = colour;
 	for (ptr = tim; *ptr != '\0'; ptr++) {
 		if (*ptr >= '0' && *ptr <= '9')
 			idx = *ptr - '0';
@@ -299,7 +300,7 @@ window_clock_draw_screen(struct window_mode_entry *wme)
 			for (i = 0; i < 5; i++) {
 				screen_write_cursormove(&ctx, x + i, y + j, 0);
 				if (window_clock_table[idx][j][i])
-					screen_write_putc(&ctx, &gc, ' ');
+					screen_write_putc(&ctx, &gc, '#');
 			}
 		}
 		x += 6;

window-copy.c

@@ -52,6 +52,12 @@ static void	window_copy_redraw_lines(struct window_mode_entry *, u_int,
 		    u_int);
 static void	window_copy_redraw_screen(struct window_mode_entry *);
 static void	window_copy_style_changed(struct window_mode_entry *);
+static int	window_copy_line_number_mode(struct window_mode_entry *);
+static int	window_copy_line_number_is_absolute(struct window_mode_entry *);
+static int	window_copy_line_numbers_active(struct window_mode_entry *);
+static u_int	window_copy_line_number_width(struct window_mode_entry *);
+static u_int	window_copy_cursor_offset(struct window_mode_entry *, u_int, u_int);
+static u_int	window_copy_cursor_unoffset(struct window_mode_entry *, u_int, u_int);
 static void	window_copy_write_line(struct window_mode_entry *,
 		    struct screen_write_ctx *, u_int);
 static void	window_copy_write_lines(struct window_mode_entry *,
@@ -207,6 +213,14 @@ enum window_copy_cmd_clear {
 	WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
 };
 
+enum window_copy_line_numbers {
+	WINDOW_COPY_LINE_NUMBERS_OFF,
+	WINDOW_COPY_LINE_NUMBERS_DEFAULT,
+	WINDOW_COPY_LINE_NUMBERS_ABSOLUTE,
+	WINDOW_COPY_LINE_NUMBERS_RELATIVE,
+	WINDOW_COPY_LINE_NUMBERS_HYBRID,
+};
+
 struct window_copy_cmd_state {
 	struct window_mode_entry	*wme;
 	struct args			*args;
@@ -264,6 +278,7 @@ struct window_copy_mode_data {
 	int		 rectflag;	/* in rectangle copy mode? */
 	int		 scroll_exit;	/* exit on scroll to end? */
 	int		 hide_position;	/* hide position marker */
+	int		 line_numbers;
 
 	enum {
 		SEL_CHAR,		/* select one char at a time */
@@ -271,6 +286,13 @@ struct window_copy_mode_data {
 		SEL_LINE,		/* select one line at a time */
 	} selflag;
 
+	enum {
+		RECENTRE_TOP,
+		RECENTRE_MIDDLE,
+		RECENTRE_BOTTOM,
+	} recentre_state;
+	u_int		 recentre_line;
+
 	const char	*separators;	/* word separators */
 
 	u_int		 dx;		/* drag start position */
@@ -427,6 +449,7 @@ window_copy_common_init(struct window_mode_entry *wme)
 
 	data->jumptype = WINDOW_COPY_OFF;
 	data->jumpchar = NULL;
+	data->line_numbers = 1;
 
 	screen_init(&data->screen, screen_size_x(base), screen_size_y(base), 0);
 	screen_set_default_cursor(&data->screen, global_w_options);
@@ -463,9 +486,12 @@ window_copy_init(struct window_mode_entry *wme,
 	data->scroll_exit = args_has(args, 'e');
 	data->hide_position = args_has(args, 'H');
 
-	if (base->hyperlinks != NULL)
+	if (base->hyperlinks != NULL) {
+		hyperlinks_free(data->screen.hyperlinks);
 		data->screen.hyperlinks = hyperlinks_copy(base->hyperlinks);
-	data->screen.cx = data->cx;
+	}
+	data->screen.cx = window_copy_cursor_offset(wme, data->cx,
+	    screen_size_x(&data->screen));
 	data->screen.cy = data->cy;
 	data->mx = data->cx;
 	data->my = screen_hsize(data->backing) + data->cy - data->oy;
@@ -474,9 +500,13 @@ window_copy_init(struct window_mode_entry *wme,
 	screen_write_start(&ctx, &data->screen);
 	for (i = 0; i < screen_size_y(&data->screen); i++)
 		window_copy_write_line(wme, &ctx, i);
-	screen_write_cursormove(&ctx, data->cx, data->cy, 0);
+	screen_write_cursormove(&ctx, window_copy_cursor_offset(wme, data->cx,
+	    screen_size_x(&data->screen)), data->cy, 0);
 	screen_write_stop(&ctx);
 
+	data->recentre_state = RECENTRE_MIDDLE;
+	data->recentre_line = 0;
+
 	return (&data->screen);
 }
 
@@ -491,6 +521,7 @@ window_copy_view_init(struct window_mode_entry *wme,
 
 	data = window_copy_common_init(wme);
 	data->viewmode = 1;
+	data->line_numbers = 0;
 
 	data->backing = xmalloc(sizeof *data->backing);
 	screen_init(data->backing, sx, screen_size_y(base), UINT_MAX);
@@ -937,12 +968,22 @@ window_copy_formats(struct window_mode_entry *wme, struct format_tree *ft)
 {
 	struct window_copy_mode_data	*data = wme->data;
 	u_int				 hsize = screen_hsize(data->backing);
+	u_int				 position, limit;
 	struct grid_line		*gl;
 
 	gl = grid_get_line(data->backing->grid, hsize - data->oy);
 	format_add(ft, "top_line_time", "%llu", (unsigned long long)gl->time);
 
 	format_add(ft, "scroll_position", "%d", data->oy);
+	if (window_copy_line_number_is_absolute(wme)) {
+		position = hsize - data->oy + 1;
+		limit = hsize + screen_size_y(data->backing);
+	} else {
+		position = data->oy;
+		limit = hsize;
+	}
+	format_add(ft, "copy_position", "%u", position);
+	format_add(ft, "copy_position_limit", "%u", limit);
 	format_add(ft, "rectangle_toggle", "%d", data->rectflag);
 
 	format_add(ft, "copy_cursor_x", "%d", data->cx);
@@ -2769,6 +2810,62 @@ window_copy_cmd_refresh_from_pane(struct window_copy_cmd_state *cs)
 	return (WINDOW_COPY_CMD_REDRAW);
 }
 
+static enum window_copy_cmd_action
+window_copy_cmd_recentre_top_bottom(struct window_copy_cmd_state *cs)
+{
+	struct window_mode_entry	*wme = cs->wme;
+	struct window_copy_mode_data	*data = wme->data;
+	u_int 				 cy = data->cy, oy = data->oy;
+	u_int				 sy = screen_size_y(&data->screen) - 1;
+	u_int				 sm = sy / 2, backing_row;
+	enum { MIDDLE, TOP, BOTTOM }	 target;
+
+	backing_row = screen_hsize(data->backing) + cy - data->oy;
+	if (data->recentre_line != backing_row) {
+		data->recentre_state = RECENTRE_MIDDLE;
+		data->recentre_line = backing_row;
+	}
+
+	switch (data->recentre_state) {
+	case RECENTRE_MIDDLE:
+		data->recentre_state = RECENTRE_TOP;
+		target = MIDDLE;
+		break;
+	case RECENTRE_TOP:
+		data->recentre_state = RECENTRE_BOTTOM;
+		target = TOP;
+		break;
+	case RECENTRE_BOTTOM:
+	default:
+		data->recentre_state = RECENTRE_MIDDLE;
+		target = BOTTOM;
+		break;
+	}
+
+	oy = data->oy;
+	switch (target) {
+	case MIDDLE:
+		if (cy < sm)
+			window_copy_scroll_down(wme, sm - cy);
+		else if (cy > sm)
+			window_copy_scroll_up(wme, cy - sm);
+		if (data->oy != oy)
+			data->cy = cy + (data->oy - oy);
+		break;
+	case TOP:
+		window_copy_scroll_up(wme, cy);
+		data->cy = cy - (oy - data->oy);
+		break;
+	case BOTTOM:
+		window_copy_scroll_down(wme, sy - cy);
+		data->cy = cy + (data->oy - oy);
+		break;
+	}
+	window_copy_update_selection(wme, 0, 0);
+
+	return (WINDOW_COPY_CMD_REDRAW);
+}
+
 static const struct {
 	const char			 *command;
 	u_int				  minargs;
@@ -3153,6 +3250,12 @@ static const struct {
 	  .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
 	  .f = window_copy_cmd_previous_word
 	},
+	{ .command = "recentre-top-bottom",
+	  .args = { "", 0, 0, NULL },
+	  .flags = WINDOW_COPY_CMD_FLAG_READONLY,
+	  .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
+	  .f = window_copy_cmd_recentre_top_bottom
+	},
 	{ .command = "rectangle-on",
 	  .args = { "", 0, 0, NULL },
 	  .flags = 0,
@@ -4471,15 +4574,28 @@ window_copy_goto_line(struct window_mode_entry *wme, const char *linestr)
 {
 	struct window_copy_mode_data	*data = wme->data;
 	const char			*errstr;
+	u_int				 hsize = screen_hsize(data->backing);
+	u_int				 line;
 	int				 lineno;
 
 	lineno = strtonum(linestr, -1, INT_MAX, &errstr);
 	if (errstr != NULL)
 		return;
-	if (lineno < 0 || (u_int)lineno > screen_hsize(data->backing))
-		lineno = screen_hsize(data->backing);
 
+	if (window_copy_line_number_is_absolute(wme)) {
+		if (lineno <= 0)
+			line = 1;
+		else if ((u_int)lineno > hsize + 1)
+			line = hsize + 1;
+		else
+			line = lineno;
+		data->oy = hsize - (line - 1);
+	} else {
+		if (lineno < 0 || (u_int)lineno > hsize)
+			lineno = hsize;
 		data->oy = lineno;
+	}
+
 	window_copy_update_selection(wme, 1, 0);
 	window_copy_redraw_screen(wme);
 }
@@ -4628,7 +4744,7 @@ window_copy_update_style(struct window_mode_entry *wme, u_int fx, u_int fy,
 
 static void
 window_copy_write_one(struct window_mode_entry *wme,
-    struct screen_write_ctx *ctx, u_int py, u_int fy, u_int nx,
+    struct screen_write_ctx *ctx, u_int px, u_int py, u_int fy, u_int nx,
     const struct grid_cell *mgc, const struct grid_cell *cgc,
     const struct grid_cell *mkgc)
 {
@@ -4637,7 +4753,7 @@ window_copy_write_one(struct window_mode_entry *wme,
 	struct grid_cell		 gc;
 	u_int		 		 fx;
 
-	screen_write_cursormove(ctx, 0, py, 0);
+	screen_write_cursormove(ctx, px, py, 0);
 	for (fx = 0; fx < nx; fx++) {
 		grid_get_cell(gd, fx, fy, &gc);
 		if (fx + gc.data.width <= nx) {
@@ -4648,6 +4764,116 @@ window_copy_write_one(struct window_mode_entry *wme,
 	}
 }
 
+static int
+window_copy_line_number_mode(struct window_mode_entry *wme)
+{
+	struct window_pane		*wp = wme->wp;
+	struct window_copy_mode_data	*data = wme->data;
+	struct options			*oo = wp->window->options;
+
+	if (!data->line_numbers)
+		return (WINDOW_COPY_LINE_NUMBERS_OFF);
+	return (options_get_number(oo, "copy-mode-line-numbers"));
+}
+
+static int
+window_copy_line_number_is_absolute(struct window_mode_entry *wme)
+{
+	switch (window_copy_line_number_mode(wme)) {
+	case WINDOW_COPY_LINE_NUMBERS_ABSOLUTE:
+	case WINDOW_COPY_LINE_NUMBERS_RELATIVE:
+	case WINDOW_COPY_LINE_NUMBERS_HYBRID:
+		return (1);
+	case WINDOW_COPY_LINE_NUMBERS_OFF:
+	case WINDOW_COPY_LINE_NUMBERS_DEFAULT:
+		return (0);
+	}
+	fatalx("bad line number mode");
+}
+
+static int
+window_copy_line_numbers_active(struct window_mode_entry *wme)
+{
+	return (window_copy_line_number_mode(wme) !=
+	    WINDOW_COPY_LINE_NUMBERS_OFF);
+}
+
+static u_int
+window_copy_line_number_width(struct window_mode_entry *wme)
+{
+	struct window_copy_mode_data	*data = wme->data;
+	u_int				 lines, digits;
+
+	if (!window_copy_line_numbers_active(wme))
+		return (0);
+
+	lines = screen_hsize(data->backing) + screen_size_y(data->backing) + 1;
+	digits = 1;
+	while (lines >= 10) {
+		lines /= 10;
+		digits++;
+	}
+	if (digits < 3)
+		digits = 3;
+	return (digits + 1);
+}
+
+static u_int
+window_copy_cursor_offset(struct window_mode_entry *wme, u_int cx, u_int sx)
+{
+	u_int	width = window_copy_line_number_width(wme);
+	u_int	content;
+
+	if (width == 0)
+		return (cx);
+	if (width >= sx)
+		content = 1;
+	else
+		content = sx - width;
+	if (cx >= content)
+		return (sx - 1);
+	return (width + cx);
+}
+
+static u_int
+window_copy_cursor_unoffset(struct window_mode_entry *wme, u_int vx, u_int sx)
+{
+	u_int	width = window_copy_line_number_width(wme);
+	u_int	content;
+
+	if (width == 0)
+		return (vx);
+	if (width >= sx)
+		content = 1;
+	else
+		content = sx - width;
+	if (vx < width)
+		return (0);
+	vx -= width;
+	if (vx >= content)
+		return (content - 1);
+	return (vx);
+}
+
+void
+window_copy_set_line_numbers(struct window_pane *wp, int enabled)
+{
+	struct window_mode_entry	*wme = TAILQ_FIRST(&wp->modes);
+	struct window_copy_mode_data	*data;
+
+	if (wme == NULL)
+		return;
+	if (wme->mode != &window_copy_mode)
+		return;
+	data = wme->data;
+	if (data == NULL)
+		return;
+	if (data->line_numbers == enabled)
+		return;
+	data->line_numbers = enabled;
+	window_copy_redraw_screen(wme);
+}
+
 int
 window_copy_get_current_offset(struct window_pane *wp, u_int *offset,
     u_int *size)
@@ -4673,12 +4899,23 @@ window_copy_write_line(struct window_mode_entry *wme,
 	struct window_copy_mode_data	*data = wme->data;
 	struct screen			*s = &data->screen;
 	struct options			*oo = wp->window->options;
-	struct grid_cell		 gc, mgc, cgc, mkgc;
+	struct grid_cell		 gc, mgc, cgc, mkgc, ln_gc, cur_ln_gc;
 	u_int				 sx = screen_size_x(s);
 	u_int				 hsize = screen_hsize(data->backing);
+	u_int				 width;
+	u_int				 absolute, line_number, content_sx;
 	const char			*value;
 	char				*expanded;
 	struct format_tree		*ft;
+	int				 current, mode;
+
+	width  = window_copy_line_number_width(wme);
+	if (width >= sx)
+		content_sx = 1;
+	else if (width != 0)
+		content_sx = sx - width;
+	else
+		content_sx = sx;
 
 	ft = format_create_defaults(NULL, NULL, NULL, NULL, wp);
 
@@ -4690,24 +4927,52 @@ window_copy_write_line(struct window_mode_entry *wme,
 	cgc.flags |= GRID_FLAG_NOPALETTE;
 	style_apply(&mkgc, oo, "copy-mode-mark-style", ft);
 	mkgc.flags |= GRID_FLAG_NOPALETTE;
+	if (width != 0) {
+		style_apply(&ln_gc, oo, "copy-mode-line-number-style", ft);
+		ln_gc.flags |= GRID_FLAG_NOPALETTE;
+		style_apply(&cur_ln_gc, oo,
+		    "copy-mode-current-line-number-style", ft);
+		cur_ln_gc.flags |= GRID_FLAG_NOPALETTE;
+		current = (py == data->cy);
+		absolute = hsize - data->oy + py + 1;
+		mode = window_copy_line_number_mode(wme);
+		if (mode == WINDOW_COPY_LINE_NUMBERS_DEFAULT) {
+			if (py < data->oy)
+				line_number = data->oy - py;
+			else
+				line_number = py - data->oy;
+		} else if (mode == WINDOW_COPY_LINE_NUMBERS_ABSOLUTE)
+			line_number = absolute;
+		else if (mode == WINDOW_COPY_LINE_NUMBERS_HYBRID && current)
+			line_number = absolute;
+		else if (py > data->cy)
+			line_number = py - data->cy;
+		else
+			line_number = data->cy - py;
+		screen_write_cursormove(ctx, 0, py, 0);
+		screen_write_nputs(ctx, width, current ? &cur_ln_gc : &ln_gc,
+		    "%*u ", (int)width - 1, line_number);
+	}
 
-	window_copy_write_one(wme, ctx, py, hsize - data->oy + py,
+	window_copy_write_one(wme, ctx, width, py, hsize - data->oy + py,
-	    screen_size_x(s), &mgc, &cgc, &mkgc);
+	    content_sx, &mgc, &cgc, &mkgc);
 
 	if (py == 0 && s->rupper < s->rlower && !data->hide_position) {
 		value = options_get_string(oo, "copy-mode-position-format");
 		if (*value != '\0') {
 			expanded = format_expand(ft, value);
 			if (*expanded != '\0') {
-				screen_write_cursormove(ctx, 0, 0, 0);
+				screen_write_cursormove(ctx, width, 0, 0);
-				format_draw(ctx, &gc, sx, expanded, NULL, 0);
+				format_draw(ctx, &gc, content_sx, expanded,
+				    NULL, 0);
 			}
 			free(expanded);
 		}
 	}
 
-	if (py == data->cy && data->cx == screen_size_x(s)) {
+	if (py == data->cy && data->cx >= content_sx) {
-		screen_write_cursormove(ctx, screen_size_x(s) - 1, py, 0);
+		screen_write_cursormove(ctx, window_copy_cursor_offset(wme,
+		    data->cx, screen_size_x(s)), py, 0);
 		screen_write_putc(ctx, &grid_default_cell, '$');
 	}
 
@@ -4757,13 +5022,28 @@ window_copy_redraw_lines(struct window_mode_entry *wme, u_int py, u_int ny)
 {
 	struct window_pane		*wp = wme->wp;
 	struct window_copy_mode_data	*data = wme->data;
+	struct screen			*s = &data->screen;
 	struct screen_write_ctx 	 ctx;
 	u_int				 i;
 
+	if (window_copy_line_number_width(wme) != 0) {
+		screen_write_start(&ctx, &data->screen);
+		for (i = py; i < py + ny; i++)
+			window_copy_write_line(wme, &ctx, i);
+		screen_write_cursormove(&ctx,
+		    window_copy_cursor_offset(wme, data->cx, screen_size_x(s)),
+		    data->cy, 0);
+		screen_write_stop(&ctx);
+		wp->flags |= (PANE_REDRAW|PANE_REDRAWSCROLLBAR);
+		return;
+	}
+
 	screen_write_start_pane(&ctx, wp, NULL);
 	for (i = py; i < py + ny; i++)
 		window_copy_write_line(wme, &ctx, i);
-	screen_write_cursormove(&ctx, data->cx, data->cy, 0);
+	screen_write_cursormove(&ctx,
+	    window_copy_cursor_offset(wme, data->cx, screen_size_x(s)), data->cy,
+	    0);
 	screen_write_stop(&ctx);
 
 	wp->flags |= PANE_REDRAWSCROLLBAR;
@@ -4882,17 +5162,42 @@ window_copy_update_cursor(struct window_mode_entry *wme, u_int cx, u_int cy)
 	struct window_copy_mode_data	*data = wme->data;
 	struct screen			*s = &data->screen;
 	struct screen_write_ctx		 ctx;
-	u_int				 old_cx, old_cy;
+	u_int				 old_cx, old_cy, width, content_sx;
 
 	old_cx = data->cx; old_cy = data->cy;
 	data->cx = cx; data->cy = cy;
+	if (window_copy_line_numbers_active(wme)) {
+		width = window_copy_line_number_width(wme);
+
+		if (s->sel != NULL || data->lineflag != LINE_SEL_NONE ||
+		    old_cy != data->cy) {
+			window_copy_redraw_screen(wme);
+			return;
+		}
+		if (width >= screen_size_x(s))
+			content_sx = 1;
+		else
+			content_sx = screen_size_x(s) - width;
+		if (old_cx >= content_sx || data->cx >= content_sx) {
+			window_copy_redraw_screen(wme);
+			return;
+		}
+		screen_write_start_pane(&ctx, wp, NULL);
+		screen_write_cursormove(&ctx,
+		    window_copy_cursor_offset(wme, data->cx, screen_size_x(s)),
+		    data->cy, 0);
+		screen_write_stop(&ctx);
+		return;
+	}
 	if (old_cx == screen_size_x(s))
 		window_copy_redraw_lines(wme, old_cy, 1);
 	if (data->cx == screen_size_x(s))
 		window_copy_redraw_lines(wme, data->cy, 1);
 	else {
 		screen_write_start_pane(&ctx, wp, NULL);
-		screen_write_cursormove(&ctx, data->cx, data->cy, 0);
+		screen_write_cursormove(&ctx,
+		    window_copy_cursor_offset(wme, data->cx, screen_size_x(s)),
+		    data->cy, 0);
 		screen_write_stop(&ctx);
 	}
 }
@@ -4967,7 +5272,7 @@ window_copy_set_selection(struct window_mode_entry *wme, int may_redraw,
 	struct screen			*s = &data->screen;
 	struct options			*oo = wp->window->options;
 	struct grid_cell		 gc;
-	u_int				 sx, sy, cy, endsx, endsy;
+	u_int				 sx, sy, cy, endsx, endsy, clipx;
 	int				 startrelpos, endrelpos;
 	struct format_tree		*ft;
 
@@ -4995,8 +5300,15 @@ window_copy_set_selection(struct window_mode_entry *wme, int may_redraw,
 	style_apply(&gc, oo, "copy-mode-selection-style", ft);
 	gc.flags |= GRID_FLAG_NOPALETTE;
 	format_free(ft);
+	clipx = window_copy_line_number_width(wme);
+	if (clipx >= screen_size_x(s))
+		clipx = screen_size_x(s) - 1;
+	if (window_copy_line_numbers_active(wme)) {
+		sx = window_copy_cursor_offset(wme, sx, screen_size_x(s));
+		endsx = window_copy_cursor_offset(wme, endsx, screen_size_x(s));
+	}
 	screen_set_selection(s, sx, sy, endsx, endsy, data->rectflag,
-	    data->modekeys, &gc);
+	    clipx, data->modekeys, &gc);
 
 	if (data->rectflag && may_redraw) {
 		/*
@@ -5152,12 +5464,20 @@ window_copy_copy_buffer(struct window_mode_entry *wme, const char *prefix,
 {
 	struct window_pane	*wp = wme->wp;
 	struct screen_write_ctx	 ctx;
+	int			 redraw = 0;
 
 	if (set_clip &&
 	    options_get_number(global_options, "set-clipboard") != 0) {
+		if (window_copy_line_numbers_active(wme) &&
+		    (wp->flags & PANE_REDRAW)) {
+			/* Clear PANE_REDRAW so clipboard write not skipped. */
+			redraw = PANE_REDRAW;
+			wp->flags &= ~PANE_REDRAW;
+		}
 		screen_write_start_pane(&ctx, wp, NULL);
 		screen_write_setselection(&ctx, "", buf, len);
 		screen_write_stop(&ctx);
+		wp->flags |= redraw;
 		notify_pane("pane-set-clipboard", wp);
 	}
 
@@ -5180,6 +5500,7 @@ window_copy_pipe_run(struct window_mode_entry *wme, struct session *s,
 	if (cmd != NULL && *cmd != '\0') {
 		job = job_run(cmd, 0, NULL, NULL, s, NULL, NULL, NULL, NULL,
 		    NULL, JOB_NOWAIT, -1, -1);
+		if (job != NULL)
 			bufferevent_write(job_get_event(job), buf, *len);
 	}
 	return (buf);
@@ -5930,6 +6251,32 @@ window_copy_scroll_up(struct window_mode_entry *wme, u_int ny)
 	if (data->searchmark != NULL && !data->timeout)
 		window_copy_search_marks(wme, NULL, data->searchregex, 1);
 	window_copy_update_selection(wme, 0, 0);
+	if (window_copy_line_numbers_active(wme)) {
+		if (window_copy_line_number_mode(wme) !=
+		    WINDOW_COPY_LINE_NUMBERS_ABSOLUTE) {
+			window_copy_redraw_screen(wme);
+			return;
+		}
+		screen_write_start(&ctx, &data->screen);
+		screen_write_cursormove(&ctx, 0, 0, 0);
+		screen_write_deleteline(&ctx, ny, 8);
+		window_copy_write_lines(wme, &ctx, screen_size_y(s) - ny, ny);
+		window_copy_write_line(wme, &ctx, 0);
+		if (screen_size_y(s) > 1)
+			window_copy_write_line(wme, &ctx, 1);
+		if (screen_size_y(s) > 3)
+			window_copy_write_line(wme, &ctx, screen_size_y(s) - 2);
+		if (s->sel != NULL && screen_size_y(s) > ny) {
+			window_copy_write_line(wme, &ctx,
+			    screen_size_y(s) - ny - 1);
+		}
+		screen_write_cursormove(&ctx,
+		    window_copy_cursor_offset(wme, data->cx, screen_size_x(s)),
+		    data->cy, 0);
+		screen_write_stop(&ctx);
+		wp->flags |= (PANE_REDRAW|PANE_REDRAWSCROLLBAR);
+		return;
+	}
 
 	screen_write_start_pane(&ctx, wp, NULL);
 	screen_write_cursormove(&ctx, 0, 0, 0);
@@ -5942,7 +6289,9 @@ window_copy_scroll_up(struct window_mode_entry *wme, u_int ny)
 		window_copy_write_line(wme, &ctx, screen_size_y(s) - 2);
 	if (s->sel != NULL && screen_size_y(s) > ny)
 		window_copy_write_line(wme, &ctx, screen_size_y(s) - ny - 1);
-	screen_write_cursormove(&ctx, data->cx, data->cy, 0);
+	screen_write_cursormove(&ctx,
+	    window_copy_cursor_offset(wme, data->cx, screen_size_x(s)), data->cy,
+	    0);
 	screen_write_stop(&ctx);
 	wp->flags |= PANE_REDRAWSCROLLBAR;
 }
@@ -5967,6 +6316,27 @@ window_copy_scroll_down(struct window_mode_entry *wme, u_int ny)
 	if (data->searchmark != NULL && !data->timeout)
 		window_copy_search_marks(wme, NULL, data->searchregex, 1);
 	window_copy_update_selection(wme, 0, 0);
+	if (window_copy_line_numbers_active(wme)) {
+		if (window_copy_line_number_mode(wme) !=
+		    WINDOW_COPY_LINE_NUMBERS_ABSOLUTE) {
+			window_copy_redraw_screen(wme);
+			return;
+		}
+		screen_write_start(&ctx, &data->screen);
+		screen_write_cursormove(&ctx, 0, 0, 0);
+		screen_write_insertline(&ctx, ny, 8);
+		window_copy_write_lines(wme, &ctx, 0, ny);
+		if (s->sel != NULL && screen_size_y(s) > ny)
+			window_copy_write_line(wme, &ctx, ny);
+		else if (ny == 1)
+			window_copy_write_line(wme, &ctx, 1);
+		screen_write_cursormove(&ctx,
+		    window_copy_cursor_offset(wme, data->cx, screen_size_x(s)),
+		    data->cy, 0);
+		screen_write_stop(&ctx);
+		wp->flags |= (PANE_REDRAW|PANE_REDRAWSCROLLBAR);
+		return;
+	}
 
 	screen_write_start_pane(&ctx, wp, NULL);
 	screen_write_cursormove(&ctx, 0, 0, 0);
@@ -5976,7 +6346,8 @@ window_copy_scroll_down(struct window_mode_entry *wme, u_int ny)
 		window_copy_write_line(wme, &ctx, ny);
 	else if (ny == 1) /* nuke position */
 		window_copy_write_line(wme, &ctx, 1);
-	screen_write_cursormove(&ctx, data->cx, data->cy, 0);
+	screen_write_cursormove(&ctx, window_copy_cursor_offset(wme, data->cx,
+	    screen_size_x(s)), data->cy, 0);
 	screen_write_stop(&ctx);
 	wp->flags |= PANE_REDRAWSCROLLBAR;
 }
@@ -6004,6 +6375,7 @@ window_copy_move_mouse(struct mouse_event *m)
 	struct window_pane		*wp;
 	struct window_mode_entry	*wme;
 	u_int				 x, y;
+	struct window_copy_mode_data	*data;
 
 	wp = cmd_mouse_pane(m, NULL, NULL);
 	if (wp == NULL)
@@ -6017,6 +6389,8 @@ window_copy_move_mouse(struct mouse_event *m)
 	if (cmd_mouse_at(wp, m, &x, &y, 0) != 0)
 		return;
 
+	data = wme->data;
+	x = window_copy_cursor_unoffset(wme, x, screen_size_x(&data->screen));
 	window_copy_update_cursor(wme, x, y);
 }
 
@@ -6047,6 +6421,7 @@ window_copy_start_drag(struct client *c, struct mouse_event *m)
 	c->tty.mouse_drag_release = window_copy_drag_release;
 
 	data = wme->data;
+	x = window_copy_cursor_unoffset(wme, x, screen_size_x(&data->screen));
 	yg = screen_hsize(data->backing) + y - data->oy;
 	if (x < data->selrx || x > data->endselrx || yg != data->selry)
 		data->selflag = SEL_CHAR;
@@ -6104,6 +6479,7 @@ window_copy_drag_update(struct client *c, struct mouse_event *m)
 
 	if (cmd_mouse_at(wp, m, &x, &y, 0) != 0)
 		return;
+	x = window_copy_cursor_unoffset(wme, x, screen_size_x(&data->screen));
 	old_cx = data->cx;
 	old_cy = data->cy;
 
@@ -6141,6 +6517,8 @@ window_copy_drag_release(struct client *c, struct mouse_event *m)
 		return;
 
 	data = wme->data;
+	if (window_copy_line_numbers_active(wme))
+		window_copy_drag_update(c, m);
 	evtimer_del(&data->dragtimer);
 }
 

window-tree.c

@@ -411,44 +411,49 @@ static void
 window_tree_draw_label(struct screen_write_ctx *ctx, u_int px, u_int py,
     u_int sx, u_int sy, const struct grid_cell *gc, const char *label)
 {
-	size_t	 len;
+	u_int	 width, ox, oy;
-	u_int	 ox, oy;
+	char	*new_label = NULL;
 
-	len = strlen(label);
+	if (sx < 5 || sy < 3)
-	if (sx == 0 || sy == 1 || len > sx)
 		return;
-	ox = (sx - len + 1) / 2;
+	width = format_width(label);
+	if (width > sx - 4) {
+		label = new_label = format_trim_left(label, sx - 4);
+		width = format_width(new_label);
+	}
+	if (width == 0)
+		return;
+	ox = (sx - width + 1) / 2;
 	oy = (sy + 1) / 2;
 
-	if (ox > 1 && ox + len < sx - 1 && sy >= 3) {
+	screen_write_cursormove(ctx, px + ox - 2, py + oy - 1, 0);
-		screen_write_cursormove(ctx, px + ox - 1, py + oy - 1, 0);
+	screen_write_box(ctx, width + 4, 3, BOX_LINES_DEFAULT,
-		screen_write_box(ctx, len + 2, 3, BOX_LINES_DEFAULT, NULL,
+	    NULL, NULL);
-		    NULL);
+	screen_write_cursormove(ctx, px + ox - 1, py + oy, 0);
-	}
+	screen_write_clearcharacter(ctx, width + 2, 8);
 	screen_write_cursormove(ctx, px + ox, py + oy, 0);
-	screen_write_puts(ctx, gc, "%s", label);
+	format_draw(ctx, gc, width, label, NULL, 0);
+	free(new_label);
 }
 
 static void
 window_tree_draw_session(struct window_tree_modedata *data, struct session *s,
     struct screen_write_ctx *ctx, u_int sx, u_int sy)
 {
-	struct options		*oo = s->options;
 	struct winlink		*wl;
 	struct window		*w;
 	u_int			 cx = ctx->s->cx, cy = ctx->s->cy;
 	u_int			 loop, total, visible, each, width, offset;
 	u_int			 current, start, end, remaining, i;
 	struct grid_cell	 gc;
-	int			 colour, active_colour, left, right;
+	int			 left, right;
 	char			*label;
+	const char		*format;
+	struct format_tree	*ft;
+	struct options		*oo;
 
 	total = winlink_count(&s->windows);
 
-	memcpy(&gc, &grid_default_cell, sizeof gc);
-	colour = options_get_number(oo, "display-panes-colour");
-	active_colour = options_get_number(oo, "display-panes-active-colour");
-
 	if (sx / total < 24) {
 		visible = sx / 24;
 		if (visible == 0)
@@ -528,11 +533,13 @@ window_tree_draw_session(struct window_tree_modedata *data, struct session *s,
 			continue;
 		}
 		w = wl->window;
+		oo = w->options;
 
-		if (wl == s->curw)
+		ft = format_create(NULL, NULL, FORMAT_WINDOW|w->id, 0);
-			gc.fg = active_colour;
+		format_defaults(ft, NULL, s, wl, NULL);
-		else
+
-			gc.fg = colour;
+		memcpy(&gc, &grid_default_cell, sizeof gc);
+		style_apply(&gc, oo, "tree-mode-preview-style", ft);
 
 		if (left)
 			offset = 3 + (i * each);
@@ -546,17 +553,19 @@ window_tree_draw_session(struct window_tree_modedata *data, struct session *s,
 		screen_write_cursormove(ctx, cx + offset, cy, 0);
 		screen_write_preview(ctx, &w->active->base, width, sy);
 
-		xasprintf(&label, " %u:%s ", wl->idx, w->name);
+		format = options_get_string(oo, "tree-mode-preview-format");
-		if (strlen(label) > width) {
+		if (*format != '\0') {
-			free(label);
+			label = format_expand(ft, format);
-			xasprintf(&label, " %u ", wl->idx);
+			if (*label != '\0') {
+				window_tree_draw_label(ctx, cx + offset, cy,
+				    width, sy, &gc, label);
 			}
-		window_tree_draw_label(ctx, cx + offset, cy, width, sy, &gc,
-		    label);
 			free(label);
+		}
 
 		if (loop != end - 1) {
-			screen_write_cursormove(ctx, cx + offset + width, cy, 0);
+			screen_write_cursormove(ctx, cx + offset + width, cy,
+			    0);
 			screen_write_vline(ctx, sy, 0, 0);
 		}
 		loop++;
@@ -567,23 +576,22 @@ window_tree_draw_session(struct window_tree_modedata *data, struct session *s,
 
 static void
 window_tree_draw_window(struct window_tree_modedata *data, struct session *s,
-    struct window *w, struct screen_write_ctx *ctx, u_int sx, u_int sy)
+    struct winlink *wl, struct screen_write_ctx *ctx, u_int sx, u_int sy)
 {
-	struct options		*oo = s->options;
+	struct window		*w = wl->window;
 	struct window_pane	*wp;
 	u_int			 cx = ctx->s->cx, cy = ctx->s->cy;
 	u_int			 loop, total, visible, each, width, offset;
-	u_int			 current, start, end, remaining, i, pane_idx;
+	u_int			 current, start, end, remaining, i;
 	struct grid_cell	 gc;
-	int			 colour, active_colour, left, right;
+	int			 left, right;
 	char			*label;
+	const char		*format;
+	struct format_tree	*ft;
+	struct options		*oo;
 
 	total = window_count_panes(w, 1);
 
-	memcpy(&gc, &grid_default_cell, sizeof gc);
-	colour = options_get_number(oo, "display-panes-colour");
-	active_colour = options_get_number(oo, "display-panes-active-colour");
-
 	if (sx / total < 24) {
 		visible = sx / 24;
 		if (visible == 0)
@@ -662,11 +670,13 @@ window_tree_draw_window(struct window_tree_modedata *data, struct session *s,
 			loop++;
 			continue;
 		}
+		oo = wp->options;
 
-		if (wp == w->active)
+		ft = format_create(NULL, NULL, FORMAT_PANE|wp->id, 0);
-			gc.fg = active_colour;
+		format_defaults(ft, NULL, s, wl, wp);
-		else
+
-			gc.fg = colour;
+		memcpy(&gc, &grid_default_cell, sizeof gc);
+		style_apply(&gc, oo, "tree-mode-preview-style", ft);
 
 		if (left)
 			offset = 3 + (i * each);
@@ -680,15 +690,19 @@ window_tree_draw_window(struct window_tree_modedata *data, struct session *s,
 		screen_write_cursormove(ctx, cx + offset, cy, 0);
 		screen_write_preview(ctx, &wp->base, width, sy);
 
-		if (window_pane_index(wp, &pane_idx) != 0)
+		format = options_get_string(oo, "tree-mode-preview-format");
-			pane_idx = loop;
+		if (*format != '\0') {
-		xasprintf(&label, " %u ", pane_idx);
+			label = format_expand(ft, format);
-		window_tree_draw_label(ctx, cx + offset, cy, each, sy, &gc,
+			if (*label != '\0') {
-		    label);
+				window_tree_draw_label(ctx, cx + offset, cy,
+				    width, sy, &gc, label);
+			}
 			free(label);
+		}
 
 		if (loop != end - 1) {
-			screen_write_cursormove(ctx, cx + offset + width, cy, 0);
+			screen_write_cursormove(ctx, cx + offset + width, cy,
+			    0);
 			screen_write_vline(ctx, sy, 0, 0);
 		}
 		loop++;
@@ -703,10 +717,10 @@ window_tree_draw(void *modedata, void *itemdata, struct screen_write_ctx *ctx,
 {
 	struct window_tree_itemdata	*item = itemdata;
 	struct session			*sp;
-	struct winlink			*wlp;
+	struct winlink			*wl;
 	struct window_pane		*wp;
 
-	window_tree_pull_item(item, &sp, &wlp, &wp);
+	window_tree_pull_item(item, &sp, &wl, &wp);
 	if (wp == NULL)
 		return;
 
@@ -717,7 +731,7 @@ window_tree_draw(void *modedata, void *itemdata, struct screen_write_ctx *ctx,
 		window_tree_draw_session(modedata, sp, ctx, sx, sy);
 		break;
 	case WINDOW_TREE_WINDOW:
-		window_tree_draw_window(modedata, sp, wlp->window, ctx, sx, sy);
+		window_tree_draw_window(modedata, sp, wl, ctx, sx, sy);
 		break;
 	case WINDOW_TREE_PANE:
 		screen_write_preview(ctx, &wp->base, sx, sy);

window.c

@@ -407,9 +407,14 @@ window_remove_ref(struct window *w, const char *from)
 void
 window_set_name(struct window *w, const char *new_name)
 {
+	char	*name;
+
+	name = clean_name(new_name, "#");
+	if (name != NULL) {
 		free(w->name);
-	utf8_stravis(&w->name, new_name, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
+		w->name = name;
 		notify_window("window-renamed", w);
+	}
 }
 
 void
@@ -2132,13 +2137,15 @@ struct style_range *
 window_pane_border_status_get_range(struct window_pane *wp, u_int x, u_int y)
 {
 	struct style_ranges	*srs;
-	struct window		*w = wp->window;
+	struct window		*w;
-	struct options		*wo = w->options;
+	struct options		*wo;
 	u_int			 line;
 	int			 pane_status;
 
 	if (wp == NULL)
 		return (NULL);
+	w = wp->window;
+	wo = w->options;
 	srs = &wp->border_status_line.ranges;
 
 	pane_status = options_get_number(wo, "pane-border-status");