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Change display-menu from taking a single string to a set of arguments,
which is much easier to work with. Based on a diff from Avi Halachmi.

/* $OpenBSD: cmd-display-menu.c,v 1.4 2019/05/28 07:18:42 nicm Exp $ */

/*
 * Copyright (c) 2019 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"

/*
 * Display a menu on a client.
 */

static enum cmd_retval	cmd_display_menu_exec(struct cmd *,
			    struct cmdq_item *);

const struct cmd_entry cmd_display_menu_entry = {
	.name = "display-menu",
	.alias = "menu",

	.args = { "c:t:T:x:y:", 1, -1 },
	.usage = "[-c target-client] " CMD_TARGET_PANE_USAGE " [-T title] "
		 "[-x position] [-y position] name key command ...",

	.target = { 't', CMD_FIND_PANE, 0 },

	.flags = CMD_AFTERHOOK,
	.exec = cmd_display_menu_exec
};

static enum cmd_retval
cmd_display_menu_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args		*args = self->args;
	struct client		*c;
	struct session		*s = item->target.s;
	struct winlink		*wl = item->target.wl;
	struct window_pane	*wp = item->target.wp;
	struct cmd_find_state	*fs = &item->target;
	struct menu		*menu = NULL;
	struct style_range	*sr;
	struct menu_item	 menu_item;
	const char		*xp, *yp, *key;
	char			*title, *name;
	int			 at, flags, i;
	u_int			 px, py, ox, oy, sx, sy;

	if ((c = cmd_find_client(item, args_get(args, 'c'), 0)) == NULL)
		return (CMD_RETURN_ERROR);
	if (c->overlay_draw != NULL)
		return (CMD_RETURN_NORMAL);
	at = status_at_line(c);

	if (args_has(args, 'T'))
		title = format_single(NULL, args_get(args, 'T'), c, s, wl, wp);
	else
		title = xstrdup("");

	menu = menu_create(title);

	for (i = 0; i != args->argc; /* nothing */) {
		name = args->argv[i++];
		if (*name == '\0') {
			menu_add_item(menu, NULL, item, c, fs);
			continue;
		}

		if (args->argc - i < 2) {
			cmdq_error(item, "not enough arguments");
			free(title);
			menu_free(menu);
			return (CMD_RETURN_ERROR);
		}
		key = args->argv[i++];

		menu_item.name = name;
		menu_item.key = key_string_lookup_string(key);
		menu_item.command = args->argv[i++];

		menu_add_item(menu, &menu_item, item, c, fs);
	}
	free(title);
	if (menu == NULL) {
		cmdq_error(item, "invalid menu arguments");
		return (CMD_RETURN_ERROR);
	}
	if (menu->count == 0) {
		menu_free(menu);
		return (CMD_RETURN_NORMAL);
	}

	xp = args_get(args, 'x');
	if (xp == NULL)
		px = 0;
	else if (strcmp(xp, "R") == 0)
		px = c->tty.sx - 1;
	else if (strcmp(xp, "P") == 0) {
		tty_window_offset(&c->tty, &ox, &oy, &sx, &sy);
		if (wp->xoff >= ox)
			px = wp->xoff - ox;
		else
			px = 0;
	} else if (strcmp(xp, "M") == 0 && item->shared->mouse.valid) {
		if (item->shared->mouse.x > (menu->width + 4) / 2)
			px = item->shared->mouse.x - (menu->width + 4) / 2;
		else
			px = 0;
	}
	else if (strcmp(xp, "W") == 0) {
		if (at == -1)
			px = 0;
		else {
			TAILQ_FOREACH(sr, &c->status.entries[0].ranges, entry) {
				if (sr->type != STYLE_RANGE_WINDOW)
					continue;
				if (sr->argument == (u_int)wl->idx)
					break;
			}
			if (sr != NULL)
				px = sr->start;
			else
				px = 0;
		}
	} else
		px = strtoul(xp, NULL, 10);
	if (px + menu->width + 4 >= c->tty.sx)
		px = c->tty.sx - menu->width - 4;

	yp = args_get(args, 'y');
	if (yp == NULL)
		py = 0;
	else if (strcmp(yp, "P") == 0) {
		tty_window_offset(&c->tty, &ox, &oy, &sx, &sy);
		if (wp->yoff + wp->sy >= oy)
			py = wp->yoff + wp->sy - oy;
		else
			py = 0;
	} else if (strcmp(yp, "M") == 0 && item->shared->mouse.valid)
		py = item->shared->mouse.y + menu->count + 2;
	else if (strcmp(yp, "S") == 0) {
		if (at == -1)
			py = c->tty.sy;
		else if (at == 0)
			py = status_line_size(c) + menu->count + 2;
		else
			py = at;
	} else
		py = strtoul(yp, NULL, 10);
	if (py < menu->count + 2)
		py = 0;
	else
		py -= menu->count + 2;
	if (py + menu->count + 2 >= c->tty.sy)
		py = c->tty.sy - menu->count - 2;

	flags = 0;
	if (!item->shared->mouse.valid)
		flags |= MENU_NOMOUSE;
	if (menu_display(menu, flags, item, px, py, c, fs, NULL, NULL) != 0)
		return (CMD_RETURN_NORMAL);
	return (CMD_RETURN_WAIT);
}