Add a -f filter argument to the list commands like choose-tree.

cmd-list-buffers.c

@@ -36,8 +36,8 @@ const struct cmd_entry cmd_list_buffers_entry = {
 	.name = "list-buffers",
 	.alias = "lsb",
 
-	.args = { "F:", 0, 0 },
+	.args = { "F:f:", 0, 0 },
-	.usage = "[-F format]",
+	.usage = "[-F format] [-f filter]",
 
 	.flags = CMD_AFTERHOOK,
 	.exec = cmd_list_buffers_exec
@@ -49,20 +49,30 @@ cmd_list_buffers_exec(struct cmd *self, struct cmdq_item *item)
 	struct args		*args = self->args;
 	struct paste_buffer	*pb;
 	struct format_tree	*ft;
-	char			*line;
+	const char		*template, *filter;
-	const char		*template;
+	char			*line, *expanded;
+	int			 flag;
 
 	if ((template = args_get(args, 'F')) == NULL)
 		template = LIST_BUFFERS_TEMPLATE;
+	filter = args_get(args, 'f');
 
 	pb = NULL;
 	while ((pb = paste_walk(pb)) != NULL) {
 		ft = format_create(item->client, item, FORMAT_NONE, 0);
 		format_defaults_paste_buffer(ft, pb);
 
-		line = format_expand(ft, template);
+		if (filter != NULL) {
-		cmdq_print(item, "%s", line);
+			expanded = format_expand(ft, filter);
-		free(line);
+			flag = format_true(expanded);
+			free(expanded);
+		} else
+			flag = 1;
+		if (flag) {
+			line = format_expand(ft, template);
+			cmdq_print(item, "%s", line);
+			free(line);
+		}
 
 		format_free(ft);
 	}

cmd-list-panes.c

@@ -38,8 +38,8 @@ const struct cmd_entry cmd_list_panes_entry = {
 	.name = "list-panes",
 	.alias = "lsp",
 
-	.args = { "asF:t:", 0, 0 },
+	.args = { "asF:f:t:", 0, 0 },
-	.usage = "[-as] [-F format] " CMD_TARGET_WINDOW_USAGE,
+	.usage = "[-as] [-F format] [-f filter] " CMD_TARGET_WINDOW_USAGE,
 
 	.target = { 't', CMD_FIND_WINDOW, 0 },
 
@@ -91,8 +91,9 @@ cmd_list_panes_window(struct cmd *self, struct session *s, struct winlink *wl,
 	struct window_pane	*wp;
 	u_int			 n;
 	struct format_tree	*ft;
-	const char		*template;
+	const char		*template, *filter;
-	char			*line;
+	char			*line, *expanded;
+	int			 flag;
 
 	template = args_get(args, 'F');
 	if (template == NULL) {
@@ -120,6 +121,7 @@ cmd_list_panes_window(struct cmd *self, struct session *s, struct winlink *wl,
 			break;
 		}
 	}
+	filter = args_get(args, 'f');
 
 	n = 0;
 	TAILQ_FOREACH(wp, &wl->window->panes, entry) {
@@ -127,9 +129,17 @@ cmd_list_panes_window(struct cmd *self, struct session *s, struct winlink *wl,
 		format_add(ft, "line", "%u", n);
 		format_defaults(ft, NULL, s, wl, wp);
 
-		line = format_expand(ft, template);
+		if (filter != NULL) {
-		cmdq_print(item, "%s", line);
+			expanded = format_expand(ft, filter);
-		free(line);
+			flag = format_true(expanded);
+			free(expanded);
+		} else
+			flag = 1;
+		if (flag) {
+			line = format_expand(ft, template);
+			cmdq_print(item, "%s", line);
+			free(line);
+		}
 
 		format_free(ft);
 		n++;

cmd-list-sessions.c

@@ -42,8 +42,8 @@ const struct cmd_entry cmd_list_sessions_entry = {
 	.name = "list-sessions",
 	.alias = "ls",
 
-	.args = { "F:", 0, 0 },
+	.args = { "F:f:", 0, 0 },
-	.usage = "[-F format]",
+	.usage = "[-F format] [-f filter]",
 
 	.flags = CMD_AFTERHOOK,
 	.exec = cmd_list_sessions_exec
@@ -56,11 +56,13 @@ cmd_list_sessions_exec(struct cmd *self, struct cmdq_item *item)
 	struct session		*s;
 	u_int		 	 n;
 	struct format_tree	*ft;
-	const char		*template;
+	const char		*template, *filter;
-	char			*line;
+	char			*line, *expanded;
+	int			 flag;
 
 	if ((template = args_get(args, 'F')) == NULL)
 		template = LIST_SESSIONS_TEMPLATE;
+	filter = args_get(args, 'f');
 
 	n = 0;
 	RB_FOREACH(s, sessions, &sessions) {
@@ -68,9 +70,17 @@ cmd_list_sessions_exec(struct cmd *self, struct cmdq_item *item)
 		format_add(ft, "line", "%u", n);
 		format_defaults(ft, NULL, s, NULL, NULL);
 
-		line = format_expand(ft, template);
+		if (filter != NULL) {
-		cmdq_print(item, "%s", line);
+			expanded = format_expand(ft, filter);
-		free(line);
+			flag = format_true(expanded);
+			free(expanded);
+		} else
+			flag = 1;
+		if (flag) {
+			line = format_expand(ft, template);
+			cmdq_print(item, "%s", line);
+			free(line);
+		}
 
 		format_free(ft);
 		n++;

cmd-list-windows.c

@@ -49,8 +49,8 @@ const struct cmd_entry cmd_list_windows_entry = {
 	.name = "list-windows",
 	.alias = "lsw",
 
-	.args = { "F:at:", 0, 0 },
+	.args = { "F:f:at:", 0, 0 },
-	.usage = "[-a] [-F format] " CMD_TARGET_SESSION_USAGE,
+	.usage = "[-a] [-F format] [-f filter] " CMD_TARGET_SESSION_USAGE,
 
 	.target = { 't', CMD_FIND_SESSION, 0 },
 
@@ -88,8 +88,9 @@ cmd_list_windows_session(struct cmd *self, struct session *s,
 	struct winlink		*wl;
 	u_int			 n;
 	struct format_tree	*ft;
-	const char		*template;
+	const char		*template, *filter;
-	char			*line;
+	char			*line, *expanded;
+	int			 flag;
 
 	template = args_get(args, 'F');
 	if (template == NULL) {
@@ -102,6 +103,7 @@ cmd_list_windows_session(struct cmd *self, struct session *s,
 			break;
 		}
 	}
+	filter = args_get(args, 'f');
 
 	n = 0;
 	RB_FOREACH(wl, winlinks, &s->windows) {
@@ -109,9 +111,17 @@ cmd_list_windows_session(struct cmd *self, struct session *s,
 		format_add(ft, "line", "%u", n);
 		format_defaults(ft, NULL, s, wl, NULL);
 
-		line = format_expand(ft, template);
+		if (filter != NULL) {
-		cmdq_print(item, "%s", line);
+			expanded = format_expand(ft, filter);
-		free(line);
+			flag = format_true(expanded);
+			free(expanded);
+		} else
+			flag = 1;
+		if (flag) {
+			line = format_expand(ft, template);
+			cmdq_print(item, "%s", line);
+			free(line);
+		}
 
 		format_free(ft);
 		n++;

tmux.1

@@ -1055,12 +1055,18 @@ List the syntax of
 .Ar command
 or - if omitted - of all commands supported by
 .Nm .
-.It Ic list-sessions Op Fl F Ar format
+.It Xo Ic list-sessions
+.Op Fl F Ar format
+.Op Fl f Ar filter
+.Xc
 .D1 (alias: Ic ls )
 List all sessions managed by the server.
-For the meaning of the
 .Fl F
-flag, see the
+specifies the format of each line and
+.Fl f
+a filter.
+Only sessions for which the filter is true are shown.
+See the
 .Sx FORMATS
 section.
 .It Ic lock-client Op Fl t Ar target-client
@@ -2062,6 +2068,7 @@ is given, the newly linked window is not selected.
 .It Xo Ic list-panes
 .Op Fl as
 .Op Fl F Ar format
+.Op Fl f Ar filter
 .Op Fl t Ar target
 .Xc
 .D1 (alias: Ic lsp )
@@ -2078,14 +2085,18 @@ is a session (or the current session).
 If neither is given,
 .Ar target
 is a window (or the current window).
-For the meaning of the
 .Fl F
-flag, see the
+specifies the format of each line and
+.Fl f
+a filter.
+Only panes for which the filter is true are shown.
+See the
 .Sx FORMATS
 section.
 .It Xo Ic list-windows
 .Op Fl a
 .Op Fl F Ar format
+.Op Fl f Ar filter
 .Op Fl t Ar target-session
 .Xc
 .D1 (alias: Ic lsw )
@@ -2094,9 +2105,12 @@ If
 is given, list all windows on the server.
 Otherwise, list windows in the current session or in
 .Ar target-session .
-For the meaning of the
 .Fl F
-flag, see the
+specifies the format of each line and
+.Fl f
+a filter.
+Only windows for which the filter is true are shown.
+See the
 .Sx FORMATS
 section.
 .It Xo Ic move-pane
@@ -5261,12 +5275,16 @@ Delete the buffer named
 or the most recently added automatically named buffer if not specified.
 .It Xo Ic list-buffers
 .Op Fl F Ar format
+.Op Fl f Ar filter
 .Xc
 .D1 (alias: Ic lsb )
 List the global buffers.
-For the meaning of the
 .Fl F
-flag, see the
+specifies the format of each line and
+.Fl f
+a filter.
+Only buffers for which the filter is true are shown.
+See the
 .Sx FORMATS
 section.
 .It Xo Ic load-buffer