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Drop the edit mode key tables and just use fixed key bindings for the
command prompt.

/* $OpenBSD: cmd-list-keys.c,v 1.38 2016/10/12 14:50:14 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
 * List key bindings.
 */

static enum cmd_retval	 cmd_list_keys_exec(struct cmd *, struct cmd_q *);

static enum cmd_retval	 cmd_list_keys_table(struct cmd *, struct cmd_q *);
static enum cmd_retval	 cmd_list_keys_commands(struct cmd *, struct cmd_q *);

const struct cmd_entry cmd_list_keys_entry = {
	.name = "list-keys",
	.alias = "lsk",

	.args = { "t:T:", 0, 0 },
	.usage = "[-t mode-table] [-T key-table]",

	.flags = CMD_STARTSERVER,
	.exec = cmd_list_keys_exec
};

const struct cmd_entry cmd_list_commands_entry = {
	.name = "list-commands",
	.alias = "lscm",

	.args = { "F:", 0, 0 },
	.usage = "[-F format]",

	.flags = CMD_STARTSERVER,
	.exec = cmd_list_keys_exec
};

static enum cmd_retval
cmd_list_keys_exec(struct cmd *self, struct cmd_q *cmdq)
{
	struct args		*args = self->args;
	struct key_table	*table;
	struct key_binding	*bd;
	const char		*key, *tablename, *r;
	char			*cp, tmp[BUFSIZ];
	int			 repeat, width, tablewidth, keywidth;

	if (self->entry == &cmd_list_commands_entry)
		return (cmd_list_keys_commands(self, cmdq));

	if (args_has(args, 't'))
		return (cmd_list_keys_table(self, cmdq));

	tablename = args_get(args, 'T');
	if (tablename != NULL && key_bindings_get_table(tablename, 0) == NULL) {
		cmdq_error(cmdq, "table %s doesn't exist", tablename);
		return (CMD_RETURN_ERROR);
	}

	repeat = 0;
	tablewidth = keywidth = 0;
	RB_FOREACH(table, key_tables, &key_tables) {
		if (tablename != NULL && strcmp(table->name, tablename) != 0)
			continue;
		RB_FOREACH(bd, key_bindings, &table->key_bindings) {
			key = key_string_lookup_key(bd->key);

			if (bd->can_repeat)
				repeat = 1;

			width = utf8_cstrwidth(table->name);
			if (width > tablewidth)
				tablewidth = width;
			width = utf8_cstrwidth(key);
			if (width > keywidth)
				keywidth = width;
		}
	}

	RB_FOREACH(table, key_tables, &key_tables) {
		if (tablename != NULL && strcmp(table->name, tablename) != 0)
			continue;
		RB_FOREACH(bd, key_bindings, &table->key_bindings) {
			key = key_string_lookup_key(bd->key);

			if (!repeat)
				r = "";
			else if (bd->can_repeat)
				r = "-r ";
			else
				r = "   ";
			xsnprintf(tmp, sizeof tmp, "%s-T ", r);

			cp = utf8_padcstr(table->name, tablewidth);
			strlcat(tmp, cp, sizeof tmp);
			strlcat(tmp, " ", sizeof tmp);
			free(cp);

			cp = utf8_padcstr(key, keywidth);
			strlcat(tmp, cp, sizeof tmp);
			strlcat(tmp, " ", sizeof tmp);
			free(cp);

			cp = cmd_list_print(bd->cmdlist);
			strlcat(tmp, cp, sizeof tmp);
			free(cp);

			cmdq_print(cmdq, "bind-key %s", tmp);
		}
	}

	return (CMD_RETURN_NORMAL);
}

static enum cmd_retval
cmd_list_keys_table(struct cmd *self, struct cmd_q *cmdq)
{
	struct args			*args = self->args;
	const char			*tablename, *cmdstr;
	const struct mode_key_table	*mtab;
	struct mode_key_binding		*mbind;
	int			 	 width, keywidth;

	tablename = args_get(args, 't');
	if ((mtab = mode_key_findtable(tablename)) == NULL) {
		cmdq_error(cmdq, "unknown key table: %s", tablename);
		return (CMD_RETURN_ERROR);
	}

	keywidth = 0;
	RB_FOREACH(mbind, mode_key_tree, mtab->tree) {
		width = strlen(key_string_lookup_key(mbind->key));
		if (width > keywidth)
			keywidth = width;
	}

	RB_FOREACH(mbind, mode_key_tree, mtab->tree) {
		cmdstr = mode_key_tostring(mtab->cmdstr, mbind->cmd);
		if (cmdstr != NULL) {
			cmdq_print(cmdq, "bind-key -t %s %*s %s",
			    mtab->name, (int)keywidth,
			    key_string_lookup_key(mbind->key), cmdstr);
		}
	}

	return (CMD_RETURN_NORMAL);
}

static enum cmd_retval
cmd_list_keys_commands(struct cmd *self, struct cmd_q *cmdq)
{
	struct args		*args = self->args;
	const struct cmd_entry	**entryp;
	const struct cmd_entry	 *entry;
	struct format_tree	 *ft;
	const char		 *template;
	char			 *line;

	if ((template = args_get(args, 'F')) == NULL) {
		template = "#{command_list_name}"
		    "#{?command_list_alias, (#{command_list_alias}),} "
		    "#{command_list_usage}";
	}

	ft = format_create(cmdq, 0);
	format_defaults(ft, NULL, NULL, NULL, NULL);

	for (entryp = cmd_table; *entryp != NULL; entryp++) {
		entry = *entryp;

		format_add(ft, "command_list_name", "%s", entry->name);
		if (entry->alias != NULL) {
			format_add(ft, "command_list_alias", "%s",
			    entry->alias);
		}
		if (entry->alias != NULL) {
			format_add(ft, "command_list_usage", "%s",
			    entry->usage);
		}

		line = format_expand(ft, template);
		if (*line != '\0')
			cmdq_print(cmdq, "%s", line);
		free(line);
	}

	format_free(ft);
	return (CMD_RETURN_NORMAL);
}