Get rid of the ugly CMD_CHFLAG macro and use a const string (eg "dDU") in the

command entry structs and a couple of functions to check/set the flags.

cmd-attach-session.c

@@ -29,7 +29,7 @@ int	cmd_attach_session_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_attach_session_entry = {
 	"attach-session", "attach",
 	"[-d] " CMD_TARGET_SESSION_USAGE,
-       	CMD_CANTNEST|CMD_STARTSERVER|CMD_SENDENVIRON, CMD_CHFLAG('d'),
+       	CMD_CANTNEST|CMD_STARTSERVER|CMD_SENDENVIRON, "d",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_attach_session_exec,
@@ -58,7 +58,7 @@ cmd_attach_session_exec(struct cmd *self, struct cmd_ctx *ctx)
 		return (0);
 
 	if (ctx->cmdclient == NULL) {
-		if (data->chflags & CMD_CHFLAG('d')) {
+		if (cmd_check_flag(data->chflags, 'd')) {
 			/* 
 			 * Can't use server_write_session in case attaching to
 			 * the same session as currently attached to.
@@ -89,7 +89,7 @@ cmd_attach_session_exec(struct cmd *self, struct cmd_ctx *ctx)
 			return (-1);
 		}
 
-		if (data->chflags & CMD_CHFLAG('d'))
+		if (cmd_check_flag(data->chflags, 'd'))
 			server_write_session(s, MSG_DETACH, NULL, 0);
 
 		ctx->cmdclient->session = s;

cmd-bind-key.c

@@ -46,7 +46,7 @@ struct cmd_bind_key_data {
 const struct cmd_entry cmd_bind_key_entry = {
 	"bind-key", "bind",
 	"[-cnr] [-t key-table] key command [arguments]",
-	0, 0,
+	0, "",
 	NULL,
 	cmd_bind_key_parse,
 	cmd_bind_key_exec,

cmd-break-pane.c

@@ -31,7 +31,7 @@ int	cmd_break_pane_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_break_pane_entry = {
 	"break-pane", "breakp",
 	CMD_TARGET_PANE_USAGE " [-d]",
-	0, CMD_CHFLAG('d'),
+	0, "d",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_break_pane_exec,
@@ -74,7 +74,7 @@ cmd_break_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
 
 	base_idx = options_get_number(&s->options, "base-index");
  	wl = session_attach(s, w, -1 - base_idx, &cause); /* can't fail */
- 	if (!(data->chflags & CMD_CHFLAG('d')))
+ 	if (!cmd_check_flag(data->chflags, 'd'))
  		session_select(s, wl->idx);
 
 	server_redraw_session(s);

cmd-choose-client.c

@@ -34,7 +34,7 @@ void	cmd_choose_client_free(void *);
 const struct cmd_entry cmd_choose_client_entry = {
 	"choose-client", NULL,
 	CMD_TARGET_WINDOW_USAGE " [template]",
-	CMD_ARG01, 0,
+	CMD_ARG01, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_choose_client_exec,

cmd-choose-session.c

@@ -34,7 +34,7 @@ void	cmd_choose_session_free(void *);
 const struct cmd_entry cmd_choose_session_entry = {
 	"choose-session", NULL,
 	CMD_TARGET_WINDOW_USAGE " [template]",
-	CMD_ARG01, 0,
+	CMD_ARG01, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_choose_session_exec,

cmd-choose-window.c

@@ -34,7 +34,7 @@ void	cmd_choose_window_free(void *);
 const struct cmd_entry cmd_choose_window_entry = {
 	"choose-window", NULL,
 	CMD_TARGET_WINDOW_USAGE " [template]",
-	CMD_ARG01, 0,
+	CMD_ARG01, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_choose_window_exec,

cmd-clear-history.c

@@ -29,7 +29,7 @@ int	cmd_clear_history_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_clear_history_entry = {
 	"clear-history", "clearhist",
 	CMD_TARGET_PANE_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_clear_history_exec,

cmd-clock-mode.c

@@ -29,7 +29,7 @@ int	cmd_clock_mode_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_clock_mode_entry = {
 	"clock-mode", NULL,
 	CMD_TARGET_PANE_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_clock_mode_exec,

cmd-command-prompt.c

@@ -39,7 +39,7 @@ void	 cmd_command_prompt_cfree(void *);
 const struct cmd_entry cmd_command_prompt_entry = {
 	"command-prompt", NULL,
 	CMD_TARGET_CLIENT_USAGE " [-p prompts] [template]",
-	0, 0,
+	0, "",
 	cmd_command_prompt_init,
 	cmd_command_prompt_parse,
 	cmd_command_prompt_exec,

cmd-confirm-before.c

@@ -34,7 +34,7 @@ void	cmd_confirm_before_free(void *);
 const struct cmd_entry cmd_confirm_before_entry = {
 	"confirm-before", "confirm",
 	CMD_TARGET_CLIENT_USAGE " command",
-	CMD_ARG1, 0,
+	CMD_ARG1, "",
 	cmd_confirm_before_init,
 	cmd_target_parse,
 	cmd_confirm_before_exec,

cmd-copy-buffer.c

@@ -43,7 +43,7 @@ struct cmd_copy_buffer_data {
 const struct cmd_entry cmd_copy_buffer_entry = {
 	"copy-buffer", "copyb",
 	"[-a src-index] [-b dst-index] [-s src-session] [-t dst-session]",
-	0, 0,
+	0, "",
 	cmd_copy_buffer_init,
 	cmd_copy_buffer_parse,
 	cmd_copy_buffer_exec,

cmd-copy-mode.c

@@ -30,7 +30,7 @@ int	cmd_copy_mode_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_copy_mode_entry = {
 	"copy-mode", NULL,
 	"[-u] " CMD_TARGET_PANE_USAGE,
-	0, CMD_CHFLAG('u'),
+	0, "u",
 	cmd_copy_mode_init,
 	cmd_target_parse,
 	cmd_copy_mode_exec,
@@ -48,7 +48,7 @@ cmd_copy_mode_init(struct cmd *self, int key)
 
 	switch (key) {
 	case KEYC_PPAGE:
-		data->chflags |= CMD_CHFLAG('u');
+		cmd_set_flag(&data->chflags, 'u');
 		break;
 	}
 }
@@ -63,7 +63,7 @@ cmd_copy_mode_exec(struct cmd *self, struct cmd_ctx *ctx)
 		return (-1);
 
 	window_pane_set_mode(wp, &window_copy_mode);
-	if (wp->mode == &window_copy_mode && data->chflags & CMD_CHFLAG('u'))
+	if (wp->mode == &window_copy_mode && cmd_check_flag(data->chflags, 'u'))
 		window_copy_pageup(wp);
 
 	return (0);

cmd-delete-buffer.c

@@ -31,7 +31,7 @@ int	cmd_delete_buffer_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_delete_buffer_entry = {
 	"delete-buffer", "deleteb",
 	CMD_BUFFER_SESSION_USAGE,
-	0, 0,
+	0, "",
 	cmd_buffer_init,
 	cmd_buffer_parse,
 	cmd_delete_buffer_exec,

cmd-detach-client.c

@@ -29,7 +29,7 @@ int	cmd_detach_client_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_detach_client_entry = {
 	"detach-client", "detach",
 	CMD_TARGET_CLIENT_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_detach_client_exec,

cmd-display-message.c

@@ -31,7 +31,7 @@ int	cmd_display_message_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_display_message_entry = {
 	"display-message", "display",
 	CMD_TARGET_CLIENT_USAGE " [message]",
-	CMD_ARG01, 0,
+	CMD_ARG01, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_display_message_exec,

cmd-display-panes.c

@@ -29,7 +29,7 @@ int	cmd_display_panes_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_display_panes_entry = {
 	"display-panes", "displayp",
 	CMD_TARGET_CLIENT_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_display_panes_exec,

cmd-down-pane.c

@@ -29,7 +29,7 @@ int	cmd_down_pane_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_down_pane_entry = {
 	"down-pane", "downp",
 	CMD_TARGET_WINDOW_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_down_pane_exec,

cmd-find-window.c

@@ -34,7 +34,7 @@ void	cmd_find_window_callback(void *, int);
 const struct cmd_entry cmd_find_window_entry = {
 	"find-window", "findw",
 	CMD_TARGET_WINDOW_USAGE " match-string",
-	CMD_ARG1, 0,
+	CMD_ARG1, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_find_window_exec,

cmd-generic.c

@@ -23,8 +23,8 @@
 
 #include "tmux.h"
 
-int	cmd_getopt(int, char **, const char *, uint64_t);
+int	cmd_getopt(int, char **, const char *, const char *);
-int	cmd_flags(int, uint64_t, uint64_t *);
+int	cmd_parse_flags(int, const char *, uint64_t *);
 size_t	cmd_print_flags(char *, size_t, size_t, uint64_t);
 int	cmd_fill_argument(int, char **, char **, int, char **);
 
@@ -36,51 +36,53 @@ cmd_prarg(char *buf, size_t len, const char *prefix, char *arg)
 	return (xsnprintf(buf, len, "%s%s", prefix, arg));
 }
 
-/* Prepend flags from chflags onto flagstr and call getopt. */
+/* Append two flag strings together and call getopt. */
 int
-cmd_getopt(int argc, char **argv, const char *flagstr, uint64_t chflags)
+cmd_getopt(int argc, char **argv, const char *flagstr, const char *chflagstr)
 {
-	u_char	ch;
+	char	tmp[BUFSIZ];
-	char	buf[128];
-	size_t	len, off;
 
-	*buf = '\0';
+	if (strlcpy(tmp, flagstr, sizeof tmp) >= sizeof tmp)
-
+		fatalx("strlcpy overflow");
-	len = sizeof buf;
+	if (strlcat(tmp, chflagstr, sizeof tmp) >= sizeof tmp)
-	off = 0;
+		fatalx("strlcat overflow");
-
+	return (getopt(argc, argv, tmp));
-	for (ch = 0; ch < 26; ch++) {
-		if (chflags & CMD_CHFLAG('a' + ch))
-			off += xsnprintf(buf + off, len - off, "%c", 'a' + ch);
-		if (chflags & CMD_CHFLAG('A' + ch))
-			off += xsnprintf(buf + off, len - off, "%c", 'A' + ch);
-	}
-	
-	strlcat(buf, flagstr, sizeof buf);
-
-	return (getopt(argc, argv, buf));
 }
 
-/* 
+/* Return if flag character is set. */
- * If this option is expected (in ichflags), set it in ochflags, otherwise
- * return -1.
- */
 int
-cmd_flags(int opt, uint64_t ichflags, uint64_t *ochflags)
+cmd_check_flag(uint64_t chflags, int flag)
 {
-	u_char	ch;
+	if (flag >= 'A' && flag <= 'Z')
+		flag = 26 + flag - 'A';
+	else if (flag >= 'a' && flag <= 'z')
+		flag = flag - 'a';
+	else
+		return (0);
+	return ((chflags & (1ULL << flag)) != 0);
+}
 
-	for (ch = 0; ch < 26; ch++) {
+/* Set flag character. */
-		if (opt == 'a' + ch && ichflags & CMD_CHFLAG(opt)) {
+void
-			(*ochflags) |= CMD_CHFLAG(opt);
+cmd_set_flag(uint64_t *chflags, int flag)
-			return (0);
+{
-		}
+	if (flag >= 'A' && flag <= 'Z')
-		if (opt == 'A' + ch && ichflags & CMD_CHFLAG(opt)) {
+		flag = 26 + flag - 'A';
-			(*ochflags) |= CMD_CHFLAG(opt);
+	else if (flag >= 'a' && flag <= 'z')
-			return (0);
+		flag = flag - 'a';
-		}
+	else
-	}
+		return;
-	return (-1);
+	(*chflags) |= (1ULL << flag);
+}
+
+/* If this option is expected, set it in chflags, otherwise return -1. */
+int
+cmd_parse_flags(int opt, const char *chflagstr, uint64_t *chflags)
+{
+	if (strchr(chflagstr, opt) == NULL)
+		return (-1);
+	cmd_set_flag(chflags, opt);
+	return (0);
 }
 
 /* Print the flags supported in chflags. */
@@ -95,9 +97,9 @@ cmd_print_flags(char *buf, size_t len, size_t off, uint64_t chflags)
 	off += xsnprintf(buf + off, len - off, " -");
 
 	for (ch = 0; ch < 26; ch++) {
-		if (chflags & CMD_CHFLAG('a' + ch))
+		if (cmd_check_flag(chflags, 'a' + ch))
 			off += xsnprintf(buf + off, len - off, "%c", 'a' + ch);
-		if (chflags & CMD_CHFLAG('A' + ch))
+		if (cmd_check_flag(chflags, 'A' + ch))
 			off += xsnprintf(buf + off, len - off, "%c", 'A' + ch);
 	}
 	return (off - boff);
@@ -170,7 +172,7 @@ cmd_target_parse(struct cmd *self, int argc, char **argv, char **cause)
 	data = self->data;
 
 	while ((opt = cmd_getopt(argc, argv, "t:", entry->chflags)) != -1) {
-		if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
+		if (cmd_parse_flags(opt, entry->chflags, &data->chflags) == 0)
 			continue;
 		switch (opt) {
 		case 't':
@@ -253,7 +255,7 @@ cmd_srcdst_parse(struct cmd *self, int argc, char **argv, char **cause)
 	data = self->data;
 
 	while ((opt = cmd_getopt(argc, argv, "s:t:", entry->chflags)) != -1) {
-		if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
+		if (cmd_parse_flags(opt, entry->chflags, &data->chflags) == 0)
 			continue;
 		switch (opt) {
 		case 's':
@@ -345,7 +347,7 @@ cmd_buffer_parse(struct cmd *self, int argc, char **argv, char **cause)
 	data = self->data;
 
 	while ((opt = cmd_getopt(argc, argv, "b:t:", entry->chflags)) != -1) {
-		if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
+		if (cmd_parse_flags(opt, entry->chflags, &data->chflags) == 0)
 			continue;
 		switch (opt) {
 		case 'b':

cmd-has-session.c

@@ -29,7 +29,7 @@ int	cmd_has_session_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_has_session_entry = {
 	"has-session", "has",
 	CMD_TARGET_SESSION_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_has_session_exec,

cmd-if-shell.c

@@ -36,7 +36,7 @@ void	cmd_if_shell_free(void *);
 const struct cmd_entry cmd_if_shell_entry = {
 	"if-shell", "if",
 	"shell-command command",
-	CMD_ARG2, 0,
+	CMD_ARG2, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_if_shell_exec,

cmd-kill-pane.c

@@ -31,7 +31,7 @@ int	cmd_kill_pane_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_kill_pane_entry = {
 	"kill-pane", "killp",
 	"[-a] " CMD_TARGET_PANE_USAGE,
-	0, CMD_CHFLAG('a'),
+	0, "a",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_kill_pane_exec,
@@ -56,7 +56,7 @@ cmd_kill_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
 		return (0);
 	}
 
-	if (data->chflags & CMD_CHFLAG('a')) {
+	if (cmd_check_flag(data->chflags, 'a')) {
 		loopwp = TAILQ_FIRST(&wl->window->panes);
 		while (loopwp != NULL) {
 			nextwp = TAILQ_NEXT(loopwp, entry);

cmd-kill-server.c

@@ -32,7 +32,7 @@ int	cmd_kill_server_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_kill_server_entry = {
 	"kill-server", NULL,
 	"",
-	0, 0,
+	0, "",
 	NULL,
 	NULL,
 	cmd_kill_server_exec,

cmd-kill-session.c

@@ -32,7 +32,7 @@ int	cmd_kill_session_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_kill_session_entry = {
 	"kill-session", NULL,
 	CMD_TARGET_SESSION_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_kill_session_exec,

cmd-kill-window.c

@@ -29,7 +29,7 @@ int	cmd_kill_window_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_kill_window_entry = {
 	"kill-window", "killw",
 	CMD_TARGET_WINDOW_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_kill_window_exec,

cmd-last-window.c

@@ -29,7 +29,7 @@ int	cmd_last_window_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_last_window_entry = {
 	"last-window", "last",
 	CMD_TARGET_SESSION_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_last_window_exec,

cmd-link-window.c

@@ -31,7 +31,7 @@ int	cmd_link_window_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_link_window_entry = {
 	"link-window", "linkw",
 	"[-dk] " CMD_SRCDST_WINDOW_USAGE,
-	0, CMD_CHFLAG('d')|CMD_CHFLAG('k'),
+	0, "dk",
 	cmd_srcdst_init,
 	cmd_srcdst_parse,
 	cmd_link_window_exec,
@@ -53,8 +53,8 @@ cmd_link_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 	if ((idx = cmd_find_index(ctx, data->dst, &dst)) == -2)
 		return (-1);
 
-	kflag = data->chflags & CMD_CHFLAG('k');
+	kflag = cmd_check_flag(data->chflags, 'k');
-	dflag = data->chflags & CMD_CHFLAG('d');
+	dflag = cmd_check_flag(data->chflags, 'd');
 	if (server_link_window(src, wl, dst, idx, kflag, !dflag, &cause) != 0) {
 		ctx->error(ctx, "can't link window: %s", cause);
 		xfree(cause);

cmd-list-buffers.c

@@ -32,7 +32,7 @@ int	cmd_list_buffers_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_list_buffers_entry = {
 	"list-buffers", "lsb",
 	CMD_TARGET_SESSION_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_list_buffers_exec,

cmd-list-clients.c

@@ -32,7 +32,7 @@ int	cmd_list_clients_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_list_clients_entry = {
 	"list-clients", "lsc",
 	"",
-	0, 0,
+	0, "",
 	NULL,
 	NULL,
 	cmd_list_clients_exec,

cmd-list-commands.c

@@ -29,7 +29,7 @@ int	cmd_list_commands_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_list_commands_entry = {
 	"list-commands", "lscm",
 	"",
-	0, 0,
+	0, "",
 	NULL,
 	NULL,
 	cmd_list_commands_exec,

cmd-list-keys.c

@@ -33,7 +33,7 @@ int	cmd_list_keys_table(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_list_keys_entry = {
 	"list-keys", "lsk",
 	"[-t key-table]",
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_list_keys_exec,

cmd-list-panes.c

@@ -31,7 +31,7 @@ int	cmd_list_panes_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_list_panes_entry = {
 	"list-panes", "lsp",
 	CMD_TARGET_WINDOW_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_list_panes_exec,

cmd-list-sessions.c

@@ -31,7 +31,7 @@ int	cmd_list_sessions_exec(struct cmd *, struct cmd_ctx *);
 
 const struct cmd_entry cmd_list_sessions_entry = {
 	"list-sessions", "ls", "",
-	0, 0,
+	0, "",
 	NULL,
 	NULL,
 	cmd_list_sessions_exec,

cmd-list-windows.c

@@ -31,7 +31,7 @@ int	cmd_list_windows_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_list_windows_entry = {
 	"list-windows", "lsw",
 	CMD_TARGET_SESSION_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_list_windows_exec,

cmd-load-buffer.c

@@ -35,7 +35,7 @@ int	cmd_load_buffer_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_load_buffer_entry = {
 	"load-buffer", "loadb",
 	CMD_BUFFER_SESSION_USAGE " path",
-	CMD_ARG1, 0,
+	CMD_ARG1, "",
 	cmd_buffer_init,
 	cmd_buffer_parse,
 	cmd_load_buffer_exec,

cmd-lock-client.c

@@ -29,7 +29,7 @@ int	cmd_lock_client_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_lock_client_entry = {
 	"lock-client", "lockc",
 	CMD_TARGET_CLIENT_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_lock_client_exec,

cmd-lock-server.c

@@ -33,7 +33,7 @@ int	cmd_lock_server_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_lock_server_entry = {
 	"lock-server", "lock",
 	"",
-	0, 0,
+	0, "",
 	NULL,
 	NULL,
 	cmd_lock_server_exec,

cmd-lock-session.c

@@ -29,7 +29,7 @@ int	cmd_lock_session_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_lock_session_entry = {
 	"lock-session", "locks",
 	CMD_TARGET_SESSION_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_lock_session_exec,

cmd-move-window.c

@@ -31,7 +31,7 @@ int	cmd_move_window_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_move_window_entry = {
 	"move-window", "movew",
 	"[-dk] " CMD_SRCDST_WINDOW_USAGE,
-	0, CMD_CHFLAG('d')|CMD_CHFLAG('k'),
+	0, "dk",
 	cmd_srcdst_init,
 	cmd_srcdst_parse,
 	cmd_move_window_exec,
@@ -53,8 +53,8 @@ cmd_move_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 	if ((idx = cmd_find_index(ctx, data->dst, &dst)) == -2)
 		return (-1);
 
-	kflag = data->chflags & CMD_CHFLAG('k');
+	kflag = cmd_check_flag(data->chflags, 'k');
-	dflag = data->chflags & CMD_CHFLAG('d');
+	dflag = cmd_check_flag(data->chflags, 'd');
 	if (server_link_window(src, wl, dst, idx, kflag, !dflag, &cause) != 0) {
 		ctx->error(ctx, "can't move window: %s", cause);
 		xfree(cause);

cmd-new-session.c

@@ -44,7 +44,7 @@ struct cmd_new_session_data {
 const struct cmd_entry cmd_new_session_entry = {
 	"new-session", "new",
 	"[-d] [-n window-name] [-s session-name] [-t target-session] [command]",
-	CMD_STARTSERVER|CMD_CANTNEST|CMD_SENDENVIRON, 0,
+	CMD_STARTSERVER|CMD_CANTNEST|CMD_SENDENVIRON, "",
 	cmd_new_session_init,
 	cmd_new_session_parse,
 	cmd_new_session_exec,

cmd-new-window.c

@@ -43,7 +43,7 @@ struct cmd_new_window_data {
 const struct cmd_entry cmd_new_window_entry = {
 	"new-window", "neww",
 	"[-dk] [-n window-name] [-t target-window] [command]",
-	0, 0,
+	0, "",
 	cmd_new_window_init,
 	cmd_new_window_parse,
 	cmd_new_window_exec,

cmd-next-layout.c

@@ -29,7 +29,7 @@ int	cmd_next_layout_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_next_layout_entry = {
 	"next-layout", "nextl",
 	CMD_TARGET_WINDOW_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_next_layout_exec,

cmd-next-window.c

@@ -30,7 +30,7 @@ int	cmd_next_window_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_next_window_entry = {
 	"next-window", "next",
 	"[-a] " CMD_TARGET_SESSION_USAGE,
-	0, CMD_CHFLAG('a'),
+	0, "a",
 	cmd_next_window_init,
 	cmd_target_parse,
 	cmd_next_window_exec,
@@ -47,7 +47,7 @@ cmd_next_window_init(struct cmd *self, int key)
 	data = self->data;
 
 	if (key == ('n' | KEYC_ESCAPE))
-		data->chflags |= CMD_CHFLAG('a');
+		cmd_set_flag(&data->chflags, 'a');
 }
 
 int
@@ -61,7 +61,7 @@ cmd_next_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 		return (-1);
 
 	activity = 0;
-	if (data->chflags & CMD_CHFLAG('a'))
+	if (cmd_check_flag(data->chflags, 'a'))
 		activity = 1;
 
 	if (session_next(s, activity) == 0)

cmd-paste-buffer.c

@@ -32,7 +32,7 @@ void	cmd_paste_buffer_lf2cr(struct window_pane *, const char *, size_t);
 const struct cmd_entry cmd_paste_buffer_entry = {
 	"paste-buffer", "pasteb",
 	"[-dr] " CMD_BUFFER_WINDOW_USAGE,
-	0, CMD_CHFLAG('d')|CMD_CHFLAG('r'),
+	0, "dr",
 	cmd_buffer_init,
 	cmd_buffer_parse,
 	cmd_paste_buffer_exec,
@@ -64,14 +64,14 @@ cmd_paste_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
 
 	if (pb != NULL && *pb->data != '\0') {
 		/* -r means raw data without LF->CR conversion. */
-		if (data->chflags & CMD_CHFLAG('r'))
+		if (cmd_check_flag(data->chflags, 'r'))
 			bufferevent_write(wp->event, pb->data, pb->size);
 		else
 			cmd_paste_buffer_lf2cr(wp, pb->data, pb->size);
 	}
 
 	/* Delete the buffer if -d. */
-	if (data->chflags & CMD_CHFLAG('d')) {
+	if (cmd_check_flag(data->chflags, 'd')) {
 		if (data->buffer == -1)
 			paste_free_top(&s->buffers);
 		else

cmd-pipe-pane.c

@@ -38,7 +38,7 @@ void	cmd_pipe_pane_error_callback(struct bufferevent *, short, void *);
 const struct cmd_entry cmd_pipe_pane_entry = {
 	"pipe-pane", "pipep",
 	CMD_TARGET_PANE_USAGE "[-o] [command]",
-	CMD_ARG01, CMD_CHFLAG('o'),
+	CMD_ARG01, "o",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_pipe_pane_exec,
@@ -74,7 +74,7 @@ cmd_pipe_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
 	 *
 	 *	bind ^p pipep -o 'cat >>~/output'
 	 */
-	if (data->chflags & CMD_CHFLAG('o') && old_fd != -1)
+	if (cmd_check_flag(data->chflags, 'o') && old_fd != -1)
 		return (0);
 
 	/* Open the new pipe. */

cmd-previous-layout.c

@@ -29,7 +29,7 @@ int	cmd_previous_layout_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_previous_layout_entry = {
 	"previous-layout", "prevl",
 	CMD_TARGET_WINDOW_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_previous_layout_exec,

cmd-previous-window.c

@@ -30,7 +30,7 @@ int	cmd_previous_window_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_previous_window_entry = {
 	"previous-window", "prev",
 	"[-a] " CMD_TARGET_SESSION_USAGE,
-	0, CMD_CHFLAG('a'),
+	0, "a",
 	cmd_previous_window_init,
 	cmd_target_parse,
 	cmd_previous_window_exec,
@@ -47,7 +47,7 @@ cmd_previous_window_init(struct cmd *self, int key)
 	data = self->data;
 
 	if (key == ('p' | KEYC_ESCAPE))
-		data->chflags |= CMD_CHFLAG('a');
+		cmd_set_flag(&data->chflags, 'a');
 }
 
 int
@@ -61,7 +61,7 @@ cmd_previous_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 		return (-1);
 
 	activity = 0;
-	if (data->chflags & CMD_CHFLAG('a'))
+	if (cmd_check_flag(data->chflags, 'a'))
 		activity = 1;
 
 	if (session_previous(s, activity) == 0)

cmd-refresh-client.c

@@ -29,7 +29,7 @@ int	cmd_refresh_client_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_refresh_client_entry = {
 	"refresh-client", "refresh",
 	CMD_TARGET_CLIENT_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_refresh_client_exec,

cmd-rename-session.c

@@ -31,7 +31,7 @@ int	cmd_rename_session_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_rename_session_entry = {
 	"rename-session", "rename",
 	CMD_TARGET_SESSION_USAGE " new-name",
-	CMD_ARG1, 0,
+	CMD_ARG1, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_rename_session_exec,

cmd-rename-window.c

@@ -31,7 +31,7 @@ int	cmd_rename_window_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_rename_window_entry = {
 	"rename-window", "renamew",
 	CMD_TARGET_WINDOW_USAGE " new-name",
-	CMD_ARG1, 0,
+	CMD_ARG1, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_rename_window_exec,

cmd-resize-pane.c

@@ -31,9 +31,8 @@ int	cmd_resize_pane_exec(struct cmd *, struct cmd_ctx *);
 
 const struct cmd_entry cmd_resize_pane_entry = {
 	"resize-pane", "resizep",
-	"[-DU] " CMD_TARGET_PANE_USAGE " [adjustment]",
+	"[-DLRU] " CMD_TARGET_PANE_USAGE " [adjustment]",
-	CMD_ARG01,
+	CMD_ARG01, "DLRU",
-	CMD_CHFLAG('D')|CMD_CHFLAG('L')|CMD_CHFLAG('R')|CMD_CHFLAG('U'),
 	cmd_resize_pane_init,
 	cmd_target_parse,
 	cmd_resize_pane_exec,
@@ -50,28 +49,28 @@ cmd_resize_pane_init(struct cmd *self, int key)
 	data = self->data;
 
 	if (key == (KEYC_UP | KEYC_CTRL))
-		data->chflags |= CMD_CHFLAG('U');
+		cmd_set_flag(&data->chflags, 'U');
 	if (key == (KEYC_DOWN | KEYC_CTRL))
-		data->chflags |= CMD_CHFLAG('D');
+		cmd_set_flag(&data->chflags, 'D');
 	if (key == (KEYC_LEFT | KEYC_CTRL))
-		data->chflags |= CMD_CHFLAG('L');
+		cmd_set_flag(&data->chflags, 'L');
 	if (key == (KEYC_RIGHT | KEYC_CTRL))
-		data->chflags |= CMD_CHFLAG('R');
+		cmd_set_flag(&data->chflags, 'R');
 	
 	if (key == (KEYC_UP | KEYC_ESCAPE)) {
-		data->chflags |= CMD_CHFLAG('U');
+		cmd_set_flag(&data->chflags, 'U');
 		data->arg = xstrdup("5");
 	}
 	if (key == (KEYC_DOWN | KEYC_ESCAPE)) {
-		data->chflags |= CMD_CHFLAG('D');
+		cmd_set_flag(&data->chflags, 'D');
 		data->arg = xstrdup("5");
 	}
 	if (key == (KEYC_LEFT | KEYC_ESCAPE)) {
-		data->chflags |= CMD_CHFLAG('L');
+		cmd_set_flag(&data->chflags, 'L');
 		data->arg = xstrdup("5");
 	}
 	if (key == (KEYC_RIGHT | KEYC_ESCAPE)) {
-		data->chflags |= CMD_CHFLAG('R');
+		cmd_set_flag(&data->chflags, 'R');
 		data->arg = xstrdup("5");
 	}
 }
@@ -98,15 +97,14 @@ cmd_resize_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
 		}
 	}
 
-	if (data->chflags & (CMD_CHFLAG('L')|CMD_CHFLAG('R'))) {
+	if (cmd_check_flag(data->chflags, 'L'))
-		if (data->chflags & CMD_CHFLAG('L'))
+		layout_resize_pane(wp, LAYOUT_LEFTRIGHT, -adjust);
-			adjust = -adjust;
+	else if (cmd_check_flag(data->chflags, 'R'))
 		layout_resize_pane(wp, LAYOUT_LEFTRIGHT, adjust);
-	} else {
+	else if (cmd_check_flag(data->chflags, 'U'))
-		if (data->chflags & CMD_CHFLAG('U'))
+		layout_resize_pane(wp, LAYOUT_TOPBOTTOM, -adjust);
-			adjust = -adjust;
+	else if (cmd_check_flag(data->chflags, 'D'))
 		layout_resize_pane(wp, LAYOUT_TOPBOTTOM, adjust);
-	}
 	server_redraw_window(wl->window);
 
 	return (0);

cmd-respawn-window.c

@@ -31,7 +31,7 @@ int	cmd_respawn_window_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_respawn_window_entry = {
 	"respawn-window", "respawnw",
 	"[-k] " CMD_TARGET_WINDOW_USAGE " [command]",
-	CMD_ARG01, CMD_CHFLAG('k'),
+	CMD_ARG01, "k",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_respawn_window_exec,
@@ -54,7 +54,7 @@ cmd_respawn_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 		return (-1);
 	w = wl->window;
 
-	if (!(data->chflags & CMD_CHFLAG('k'))) {
+	if (!cmd_check_flag(data->chflags, 'k')) {
 		TAILQ_FOREACH(wp, &w->panes, entry) {
 			if (wp->fd == -1)
 				continue;

cmd-rotate-window.c

@@ -30,7 +30,7 @@ int	cmd_rotate_window_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_rotate_window_entry = {
 	"rotate-window", "rotatew",
 	"[-DU] " CMD_TARGET_WINDOW_USAGE,
-	0, CMD_CHFLAG('D')|CMD_CHFLAG('U'),
+	0, "DU",
 	cmd_rotate_window_init,
 	cmd_target_parse,
 	cmd_rotate_window_exec,
@@ -47,7 +47,7 @@ cmd_rotate_window_init(struct cmd *self, int key)
 	data = self->data;
 
 	if (key == ('o' | KEYC_ESCAPE))
-		data->chflags |= CMD_CHFLAG('D');
+		cmd_set_flag(&data->chflags, 'D');
 }
 
 int
@@ -64,7 +64,7 @@ cmd_rotate_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 		return (-1);
 	w = wl->window;
 
-	if (data->chflags & CMD_CHFLAG('D')) {
+	if (cmd_check_flag(data->chflags, 'D')) {
 		wp = TAILQ_LAST(&w->panes, window_panes);
 		TAILQ_REMOVE(&w->panes, wp, entry);
 		TAILQ_INSERT_HEAD(&w->panes, wp, entry);

cmd-run-shell.c

@@ -36,7 +36,7 @@ void	cmd_run_shell_free(void *);
 const struct cmd_entry cmd_run_shell_entry = {
 	"run-shell", "run",
 	"command",
-	CMD_ARG1, 0,
+	CMD_ARG1, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_run_shell_exec,

cmd-save-buffer.c

@@ -33,7 +33,7 @@ int	cmd_save_buffer_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_save_buffer_entry = {
 	"save-buffer", "saveb",
 	"[-a] " CMD_BUFFER_SESSION_USAGE " path",
-	CMD_ARG1, CMD_CHFLAG('a'),
+	CMD_ARG1, "a",
 	cmd_buffer_init,
 	cmd_buffer_parse,
 	cmd_save_buffer_exec,
@@ -66,7 +66,7 @@ cmd_save_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
 	}
 
 	mask = umask(S_IRWXG | S_IRWXO);
-	if (data->chflags & CMD_CHFLAG('a'))
+	if (cmd_check_flag(data->chflags, 'a'))
 		f = fopen(data->arg, "ab");
 	else
 		f = fopen(data->arg, "wb");

cmd-select-layout.c

@@ -30,7 +30,7 @@ int	cmd_select_layout_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_select_layout_entry = {
 	"select-layout", "selectl",
 	CMD_TARGET_WINDOW_USAGE " [layout-name]",
-	CMD_ARG01, 0,
+	CMD_ARG01, "",
 	cmd_select_layout_init,
 	cmd_target_parse,
 	cmd_select_layout_exec,

cmd-select-pane.c

@@ -29,7 +29,7 @@ int	cmd_select_pane_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_select_pane_entry = {
 	"select-pane", "selectp",
 	CMD_TARGET_PANE_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_select_pane_exec,

cmd-select-prompt.c

@@ -33,7 +33,7 @@ int	cmd_select_prompt_callback(void *, const char *);
 const struct cmd_entry cmd_select_prompt_entry = {
 	"select-prompt", NULL,
 	CMD_TARGET_CLIENT_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_select_prompt_exec,

cmd-select-window.c

@@ -32,7 +32,7 @@ int	cmd_select_window_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_select_window_entry = {
 	"select-window", "selectw",
 	CMD_TARGET_WINDOW_USAGE,
-	0, 0,
+	0, "",
 	cmd_select_window_init,
 	cmd_target_parse,
 	cmd_select_window_exec,

cmd-send-keys.c

@@ -40,7 +40,7 @@ struct cmd_send_keys_data {
 const struct cmd_entry cmd_send_keys_entry = {
 	"send-keys", "send",
 	"[-t target-pane] key ...",
-	0, 0,
+	0, "",
 	NULL,
 	cmd_send_keys_parse,
 	cmd_send_keys_exec,

cmd-send-prefix.c

@@ -29,7 +29,7 @@ int	cmd_send_prefix_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_send_prefix_entry = {
 	"send-prefix", NULL,
 	CMD_TARGET_PANE_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_send_prefix_exec,

cmd-server-info.c

@@ -36,7 +36,7 @@ int	cmd_server_info_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_server_info_entry = {
 	"server-info", "info",
 	"",
-	0, 0,
+	0, "",
 	NULL,
 	NULL,
 	cmd_server_info_exec,

cmd-set-buffer.c

@@ -31,7 +31,7 @@ int	cmd_set_buffer_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_set_buffer_entry = {
 	"set-buffer", "setb",
 	CMD_BUFFER_SESSION_USAGE " data",
-	CMD_ARG1, 0,
+	CMD_ARG1, "",
 	cmd_buffer_init,
 	cmd_buffer_parse,
 	cmd_set_buffer_exec,

cmd-set-environment.c

@@ -32,7 +32,7 @@ int	cmd_set_environment_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_set_environment_entry = {
 	"set-environment", "setenv",
 	"[-gru] " CMD_TARGET_SESSION_USAGE " name [value]",
-	CMD_ARG12, CMD_CHFLAG('g')|CMD_CHFLAG('r')|CMD_CHFLAG('u'),
+	CMD_ARG12, "gru",
 	NULL,
 	cmd_target_parse,
 	cmd_set_environment_exec,
@@ -56,7 +56,7 @@ cmd_set_environment_exec(struct cmd *self, struct cmd_ctx *ctx)
 		return (-1);
 	}
 
-	if (data->chflags & CMD_CHFLAG('g'))
+	if (cmd_check_flag(data->chflags, 'g'))
 		env = &global_environ;
 	else {
 		if ((s = cmd_find_session(ctx, data->target)) == NULL)
@@ -64,13 +64,13 @@ cmd_set_environment_exec(struct cmd *self, struct cmd_ctx *ctx)
 		env = &s->environ;
 	}
 
-	if (data->chflags & CMD_CHFLAG('u')) {
+	if (cmd_check_flag(data->chflags, 'u')) {
 		if (data->arg2 != NULL) {
 			ctx->error(ctx, "can't specify a value with -u");
 			return (-1);
 		}
 		environ_unset(env, data->arg);
-	} else if (data->chflags & CMD_CHFLAG('r')) {
+	} else if (cmd_check_flag(data->chflags, 'r')) {
 		if (data->arg2 != NULL) {
 			ctx->error(ctx, "can't specify a value with -r");
 			return (-1);

cmd-set-option.c

@@ -32,7 +32,7 @@ int	cmd_set_option_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_set_option_entry = {
 	"set-option", "set",
 	"[-agu] " CMD_TARGET_SESSION_USAGE " option [value]",
-	CMD_ARG12, CMD_CHFLAG('a')|CMD_CHFLAG('g')|CMD_CHFLAG('u'),
+	CMD_ARG12, "agu",
 	NULL,
 	cmd_target_parse,
 	cmd_set_option_exec,
@@ -113,7 +113,7 @@ cmd_set_option_exec(struct cmd *self, struct cmd_ctx *ctx)
 	u_int				 i;
 	int				 try_again;
 
-	if (data->chflags & CMD_CHFLAG('g'))
+	if (cmd_check_flag(data->chflags, 'g'))
 		oo = &global_s_options;
 	else {
 		if ((s = cmd_find_session(ctx, data->target)) == NULL)
@@ -145,8 +145,8 @@ cmd_set_option_exec(struct cmd *self, struct cmd_ctx *ctx)
 		return (-1);
 	}
 
-	if (data->chflags & CMD_CHFLAG('u')) {
+	if (cmd_check_flag(data->chflags, 'u')) {
-		if (data->chflags & CMD_CHFLAG('g')) {
+		if (cmd_check_flag(data->chflags, 'g')) {
 			ctx->error(ctx,
 			    "can't unset global option: %s", entry->name);
 			return (-1);
@@ -163,7 +163,7 @@ cmd_set_option_exec(struct cmd *self, struct cmd_ctx *ctx)
 		switch (entry->type) {
 		case SET_OPTION_STRING:
 			set_option_string(ctx, oo, entry,
-			    data->arg2, data->chflags & CMD_CHFLAG('a'));
+			    data->arg2, cmd_check_flag(data->chflags, 'a'));
 			break;
 		case SET_OPTION_NUMBER:
 			set_option_number(ctx, oo, entry, data->arg2);

cmd-set-window-option.c

@@ -32,7 +32,7 @@ int	cmd_set_window_option_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_set_window_option_entry = {
 	"set-window-option", "setw",
 	"[-agu] " CMD_TARGET_WINDOW_USAGE " option [value]",
-	CMD_ARG12, CMD_CHFLAG('a')|CMD_CHFLAG('g')|CMD_CHFLAG('u'),
+	CMD_ARG12, "agu",
 	NULL,
 	cmd_target_parse,
 	cmd_set_window_option_exec,
@@ -86,7 +86,7 @@ cmd_set_window_option_exec(struct cmd *self, struct cmd_ctx *ctx)
 	const struct set_option_entry   *entry, *opt;
 	u_int				 i;
 
-	if (data->chflags & CMD_CHFLAG('g'))
+	if (cmd_check_flag(data->chflags, 'g'))
 		oo = &global_w_options;
 	else {
 		if ((wl = cmd_find_window(ctx, data->target, NULL)) == NULL)
@@ -118,8 +118,8 @@ cmd_set_window_option_exec(struct cmd *self, struct cmd_ctx *ctx)
 		return (-1);
 	}
 
-	if (data->chflags & CMD_CHFLAG('u')) {
+	if (cmd_check_flag(data->chflags, 'u')) {
-		if (data->chflags & CMD_CHFLAG('g')) {
+		if (cmd_check_flag(data->chflags, 'g')) {
 			ctx->error(ctx,
 			    "can't unset global option: %s", entry->name);
 			return (-1);
@@ -136,7 +136,7 @@ cmd_set_window_option_exec(struct cmd *self, struct cmd_ctx *ctx)
 		switch (entry->type) {
 		case SET_OPTION_STRING:
 			set_option_string(ctx, oo, entry,
-			    data->arg2, data->chflags & CMD_CHFLAG('a'));
+			    data->arg2, cmd_check_flag(data->chflags, 'a'));
 			break;
 		case SET_OPTION_NUMBER:
 			set_option_number(ctx, oo, entry, data->arg2);

cmd-show-buffer.c

@@ -31,7 +31,7 @@ int	cmd_show_buffer_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_show_buffer_entry = {
 	"show-buffer", "showb",
 	CMD_BUFFER_SESSION_USAGE,
-	0, 0,
+	0, "",
 	cmd_buffer_init,
 	cmd_buffer_parse,
 	cmd_show_buffer_exec,

cmd-show-environment.c

@@ -32,7 +32,7 @@ int	cmd_show_environment_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_show_environment_entry = {
 	"show-environment", "showenv",
 	"[-g] " CMD_TARGET_SESSION_USAGE,
-	0, CMD_CHFLAG('g'),
+	0, "g",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_show_environment_exec,
@@ -48,7 +48,7 @@ cmd_show_environment_exec(struct cmd *self, struct cmd_ctx *ctx)
 	struct environ			*env;
 	struct environ_entry		*envent;
 
-	if (data->chflags & CMD_CHFLAG('g'))
+	if (cmd_check_flag(data->chflags, 'g'))
 		env = &global_environ;
 	else {
 		if ((s = cmd_find_session(ctx, data->target)) == NULL)

cmd-show-options.c

@@ -32,7 +32,7 @@ int	cmd_show_options_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_show_options_entry = {
 	"show-options", "show",
 	"[-g] " CMD_TARGET_SESSION_USAGE,
-	0, CMD_CHFLAG('g'),
+	0, "g",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_show_options_exec,
@@ -50,7 +50,7 @@ cmd_show_options_exec(struct cmd *self, struct cmd_ctx *ctx)
 	const struct set_option_entry   *entry;
 	const char			*optval;
 
-	if (data->chflags & CMD_CHFLAG('g'))
+	if (cmd_check_flag(data->chflags, 'g'))
 		oo = &global_s_options;
 	else {
 		if ((s = cmd_find_session(ctx, data->target)) == NULL)

cmd-show-window-options.c

@@ -32,7 +32,7 @@ int	cmd_show_window_options_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_show_window_options_entry = {
 	"show-window-options", "showw",
 	"[-g] " CMD_TARGET_WINDOW_USAGE,
-	0, CMD_CHFLAG('g'),
+	0, "g",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_show_window_options_exec,
@@ -50,7 +50,7 @@ cmd_show_window_options_exec(struct cmd *self, struct cmd_ctx *ctx)
 	const struct set_option_entry	*entry;
 	const char			*optval;
 
-	if (data->chflags & CMD_CHFLAG('g'))
+	if (cmd_check_flag(data->chflags, 'g'))
 		oo = &global_w_options;
 	else {
 		if ((wl = cmd_find_window(ctx, data->target, NULL)) == NULL)

cmd-source-file.c

@@ -37,7 +37,7 @@ struct cmd_source_file_data {
 const struct cmd_entry cmd_source_file_entry = {
 	"source-file", "source",
 	"path",
-	0, 0,
+	0, "",
 	cmd_source_file_init,
 	cmd_source_file_parse,
 	cmd_source_file_exec,

cmd-split-window.c

@@ -46,7 +46,7 @@ struct cmd_split_window_data {
 const struct cmd_entry cmd_split_window_entry = {
 	"split-window", "splitw",
 	"[-dhv] [-p percentage|-l size] [-t target-window] [command]",
-	0, 0,
+	0, "",
 	cmd_split_window_init,
 	cmd_split_window_parse,
 	cmd_split_window_exec,

cmd-start-server.c

@@ -29,7 +29,7 @@ int	cmd_start_server_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_start_server_entry = {
 	"start-server", "start",
 	"",
-	CMD_STARTSERVER, 0,
+	CMD_STARTSERVER, "",
 	NULL,
 	NULL,
 	cmd_start_server_exec,

cmd-suspend-client.c

@@ -37,7 +37,7 @@ struct cmd_suspend_client_data {
 const struct cmd_entry cmd_suspend_client_entry = {
 	"suspend-client", "suspendc",
 	"[-c target-client]",
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_suspend_client_exec,

cmd-swap-pane.c

@@ -32,7 +32,7 @@ int	cmd_swap_pane_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_swap_pane_entry = {
 	"swap-pane", "swapp",
 	"[-dDU] " CMD_SRCDST_PANE_USAGE,
-	0, CMD_CHFLAG('d')|CMD_CHFLAG('D')|CMD_CHFLAG('U'),
+	0, "dDU",
 	cmd_swap_pane_init,
 	cmd_srcdst_parse,
 	cmd_swap_pane_exec,
@@ -49,11 +49,12 @@ cmd_swap_pane_init(struct cmd *self, int key)
 	data = self->data;
 
 	if (key == '{')
-		data->chflags |= CMD_CHFLAG('U');
+		cmd_set_flag(&data->chflags, 'U');
 	else if (key == '}')
-		data->chflags |= CMD_CHFLAG('D');
+		cmd_set_flag(&data->chflags, 'D');
 }
 
+
 int
 cmd_swap_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
 {
@@ -73,11 +74,11 @@ cmd_swap_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
 
 	if (data->src == NULL) {
 		src_w = dst_w;
-		if (data->chflags & CMD_CHFLAG('D')) {
+		if (cmd_check_flag(data->chflags, 'D')) {
 			src_wp = TAILQ_NEXT(dst_wp, entry);
 			if (src_wp == NULL)
 				src_wp = TAILQ_FIRST(&dst_w->panes);
-		} else if (data->chflags & CMD_CHFLAG('U')) {
+		} else if (cmd_check_flag(data->chflags, 'U')) {
 			src_wp = TAILQ_PREV(dst_wp, window_panes, entry);
 			if (src_wp == NULL)
 				src_wp = TAILQ_LAST(&dst_w->panes, window_panes);
@@ -120,7 +121,7 @@ cmd_swap_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
 	dst_wp->xoff = xoff; dst_wp->yoff = yoff;
 	window_pane_resize(dst_wp, sx, sy);
 
-	if (!(data->chflags & CMD_CHFLAG('d'))) {
+	if (!cmd_check_flag(data->chflags, 'd')) {
 		if (src_w != dst_w) {
 			window_set_active_pane(src_w, dst_wp);
 			window_set_active_pane(dst_w, src_wp);

cmd-swap-window.c

@@ -31,7 +31,7 @@ int	cmd_swap_window_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_swap_window_entry = {
 	"swap-window", "swapw",
 	"[-d] " CMD_SRCDST_WINDOW_USAGE,
-	0, CMD_CHFLAG('d'),
+	0, "d",
 	cmd_srcdst_init,
 	cmd_srcdst_parse,
 	cmd_swap_window_exec,
@@ -68,7 +68,7 @@ cmd_swap_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 	wl_dst->window = wl_src->window;
 	wl_src->window = w;
 
-	if (!(data->chflags & CMD_CHFLAG('d'))) {
+	if (!cmd_check_flag(data->chflags, 'd')) {
 		session_select(dst, wl_dst->idx);
 		if (src != dst)
 			session_select(src, wl_src->idx);

cmd-switch-client.c

@@ -40,7 +40,7 @@ struct cmd_switch_client_data {
 const struct cmd_entry cmd_switch_client_entry = {
 	"switch-client", "switchc",
 	"[-c target-client] [-t target-session]",
-	0, 0,
+	0, "",
 	NULL,
 	cmd_switch_client_parse,
 	cmd_switch_client_exec,

cmd-unbind-key.c

@@ -40,7 +40,7 @@ struct cmd_unbind_key_data {
 const struct cmd_entry cmd_unbind_key_entry = {
 	"unbind-key", "unbind",
 	"[-cn] [-t key-table] key",
-	0, 0,
+	0, "",
 	NULL,
 	cmd_unbind_key_parse,
 	cmd_unbind_key_exec,

cmd-unlink-window.c

@@ -29,7 +29,7 @@ int	cmd_unlink_window_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_unlink_window_entry = {
 	"unlink-window", "unlinkw",
 	"[-k] " CMD_TARGET_WINDOW_USAGE,
-	0, CMD_CHFLAG('k'),
+	0, "k",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_unlink_window_exec,
@@ -59,7 +59,7 @@ cmd_unlink_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 	} else
 		references = 1;
 
-	if (!(data->chflags & CMD_CHFLAG('k')) && w->references == references) {
+	if (!cmd_check_flag(data->chflags, 'k') && w->references == references) {
 		ctx->error(ctx, "window is only linked to one session");
 		return (-1);
 	}

cmd-up-pane.c

@@ -29,7 +29,7 @@ int	cmd_up_pane_exec(struct cmd *, struct cmd_ctx *);
 const struct cmd_entry cmd_up_pane_entry = {
 	"up-pane", "upp",
 	CMD_TARGET_WINDOW_USAGE,
-	0, 0,
+	0, "",
 	cmd_target_init,
 	cmd_target_parse,
 	cmd_up_pane_exec,

tmux.h

@@ -1150,10 +1150,7 @@ struct cmd_entry {
 #define CMD_ARG12 0x40
 	int		 flags;
 
-#define CMD_CHFLAG(flag) \
+	const char	*chflags;
-	((flag) >= 'a' && (flag) <= 'z' ? 1ULL << ((flag) - 'a') :	\
-	(flag) >= 'A' && (flag) <= 'Z' ? 1ULL << (26 + (flag) - 'A') : 0)
-	uint64_t	 chflags;
 
 	void		 (*init)(struct cmd *, int);
 	int		 (*parse)(struct cmd *, int, char **, char **);
@@ -1502,6 +1499,8 @@ int	cmd_string_parse(const char *, struct cmd_list **, char **);
 
 /* cmd-generic.c */
 size_t  cmd_prarg(char *, size_t, const char *, char *);
+int	cmd_check_flag(uint64_t, int);
+void	cmd_set_flag(uint64_t *, int);
 #define CMD_TARGET_PANE_USAGE "[-t target-pane]"
 #define CMD_TARGET_WINDOW_USAGE "[-t target-window]"
 #define CMD_TARGET_SESSION_USAGE "[-t target-session]"