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Clean up and simplify the choose mode code, from Thomas Adam.

/* $OpenBSD: window-choose.c,v 1.19 2012/06/25 14:08:55 nicm Exp $ */

/*
 * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * 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 <ctype.h>
#include <string.h>

#include "tmux.h"

struct screen *window_choose_init(struct window_pane *);
void	window_choose_free(struct window_pane *);
void	window_choose_resize(struct window_pane *, u_int, u_int);
void	window_choose_key(struct window_pane *, struct session *, int);
void	window_choose_mouse(
	    struct window_pane *, struct session *, struct mouse_event *);

void	window_choose_fire_callback(
	    struct window_pane *, struct window_choose_data *);
void	window_choose_redraw_screen(struct window_pane *);
void	window_choose_write_line(
	    struct window_pane *, struct screen_write_ctx *, u_int);

void	window_choose_scroll_up(struct window_pane *);
void	window_choose_scroll_down(struct window_pane *);

const struct window_mode window_choose_mode = {
	window_choose_init,
	window_choose_free,
	window_choose_resize,
	window_choose_key,
	window_choose_mouse,
	NULL,
};

struct window_choose_mode_data {
	struct screen	        screen;

	struct mode_key_data	mdata;

	ARRAY_DECL(, struct window_choose_mode_item) list;
	u_int			top;
	u_int			selected;

	void 			(*callbackfn)(struct window_choose_data *);
	void			(*freefn)(struct window_choose_data *);
};

int	window_choose_key_index(struct window_choose_mode_data *, u_int);
int	window_choose_index_key(struct window_choose_mode_data *, int);

void
window_choose_add(struct window_pane *wp, struct window_choose_data *wcd)
{
	struct window_choose_mode_data	*data = wp->modedata;
	struct window_choose_mode_item	*item;

	ARRAY_EXPAND(&data->list, 1);
	item = &ARRAY_LAST(&data->list);

	item->name = format_expand(wcd->ft, wcd->ft_template);
	item->wcd = wcd;
}

void
window_choose_ready(struct window_pane *wp, u_int cur,
    void (*callbackfn)(struct window_choose_data *),
    void (*freefn)(struct window_choose_data *))
{
	struct window_choose_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;

	data->selected = cur;
	if (data->selected > screen_size_y(s) - 1)
		data->top = ARRAY_LENGTH(&data->list) - screen_size_y(s);

	data->callbackfn = callbackfn;
	data->freefn = freefn;

	window_choose_redraw_screen(wp);
}

struct screen *
window_choose_init(struct window_pane *wp)
{
	struct window_choose_mode_data	*data;
	struct screen			*s;
	int				 keys;

	wp->modedata = data = xmalloc(sizeof *data);

	data->callbackfn = NULL;
	data->freefn = NULL;

	ARRAY_INIT(&data->list);
	data->top = 0;

	s = &data->screen;
	screen_init(s, screen_size_x(&wp->base), screen_size_y(&wp->base), 0);
	s->mode &= ~MODE_CURSOR;
	if (options_get_number(&wp->window->options, "mode-mouse"))
		s->mode |= MODE_MOUSE_STANDARD;

	keys = options_get_number(&wp->window->options, "mode-keys");
	if (keys == MODEKEY_EMACS)
		mode_key_init(&data->mdata, &mode_key_tree_emacs_choice);
	else
		mode_key_init(&data->mdata, &mode_key_tree_vi_choice);

	return (s);
}

struct window_choose_data *
window_choose_data_create(struct cmd_ctx *ctx)
{
	struct window_choose_data	*wcd;

	wcd = xmalloc(sizeof *wcd);
	wcd->ft = format_create();
	wcd->ft_template = NULL;
	wcd->action = NULL;
	wcd->raw_format = NULL;
	wcd->client = ctx->curclient;
	wcd->session = ctx->curclient->session;
	wcd->idx = -1;

	return (wcd);
}

void
window_choose_free(struct window_pane *wp)
{
	struct window_choose_mode_data	*data = wp->modedata;
	struct window_choose_mode_item	*item;
	u_int				 i;

	for (i = 0; i < ARRAY_LENGTH(&data->list); i++) {
		item = &ARRAY_ITEM(&data->list, i);
		if (data->freefn != NULL && item->wcd != NULL)
			data->freefn(item->wcd);
		xfree(item->name);
	}
	ARRAY_FREE(&data->list);

	screen_free(&data->screen);
	xfree(data);
}

void
window_choose_resize(struct window_pane *wp, u_int sx, u_int sy)
{
	struct window_choose_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;

	data->top = 0;
	if (data->selected > sy - 1)
		data->top = data->selected - (sy - 1);

	screen_resize(s, sx, sy);
	window_choose_redraw_screen(wp);
}

void
window_choose_fire_callback(
	struct window_pane *wp, struct window_choose_data *wcd)
{
	struct window_choose_mode_data	*data = wp->modedata;
	const struct window_mode	*oldmode;

	oldmode = wp->mode;
	wp->mode = NULL;

	data->callbackfn(wcd);

	wp->mode = oldmode;
}

/* ARGSUSED */
void
window_choose_key(struct window_pane *wp, unused struct session *sess, int key)
{
	struct window_choose_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	struct screen_write_ctx		 ctx;
	struct window_choose_mode_item	*item;
	u_int		       		 items;
	int				 idx;

	items = ARRAY_LENGTH(&data->list);

	switch (mode_key_lookup(&data->mdata, key)) {
	case MODEKEYCHOICE_CANCEL:
		window_choose_fire_callback(wp, NULL);
		window_pane_reset_mode(wp);
		break;
	case MODEKEYCHOICE_CHOOSE:
		item = &ARRAY_ITEM(&data->list, data->selected);
		window_choose_fire_callback(wp, item->wcd);
		window_pane_reset_mode(wp);
		break;
	case MODEKEYCHOICE_UP:
		if (items == 0)
			break;
		if (data->selected == 0) {
			data->selected = items - 1;
			if (data->selected > screen_size_y(s) - 1)
				data->top = items - screen_size_y(s);
			window_choose_redraw_screen(wp);
			break;
		}
		data->selected--;
		if (data->selected < data->top)
			window_choose_scroll_up(wp);
		else {
			screen_write_start(&ctx, wp, NULL);
			window_choose_write_line(
			    wp, &ctx, data->selected - data->top);
			window_choose_write_line(
			    wp, &ctx, data->selected + 1 - data->top);
			screen_write_stop(&ctx);
		}
		break;
	case MODEKEYCHOICE_DOWN:
		if (items == 0)
			break;
		if (data->selected == items - 1) {
			data->selected = 0;
			data->top = 0;
			window_choose_redraw_screen(wp);
			break;
		}
		data->selected++;

		if (data->selected < data->top + screen_size_y(s)) {
			screen_write_start(&ctx, wp, NULL);
			window_choose_write_line(
			    wp, &ctx, data->selected - data->top);
			window_choose_write_line(
			    wp, &ctx, data->selected - 1 - data->top);
			screen_write_stop(&ctx);
		} else
			window_choose_scroll_down(wp);
		break;
	case MODEKEYCHOICE_SCROLLUP:
		if (items == 0 || data->top == 0)
			break;
		if (data->selected == data->top + screen_size_y(s) - 1) {
			data->selected--;
			window_choose_scroll_up(wp);
			screen_write_start(&ctx, wp, NULL);
			window_choose_write_line(
			    wp, &ctx, screen_size_y(s) - 1);
			screen_write_stop(&ctx);
		} else
			window_choose_scroll_up(wp);
		break;
	case MODEKEYCHOICE_SCROLLDOWN:
		if (items == 0 ||
		    data->top + screen_size_y(&data->screen) >= items)
			break;
		if (data->selected == data->top) {
			data->selected++;
			window_choose_scroll_down(wp);
			screen_write_start(&ctx, wp, NULL);
			window_choose_write_line(wp, &ctx, 0);
			screen_write_stop(&ctx);
		} else
			window_choose_scroll_down(wp);
		break;
	case MODEKEYCHOICE_PAGEUP:
		if (data->selected < screen_size_y(s)) {
			data->selected = 0;
			data->top = 0;
		} else {
			data->selected -= screen_size_y(s);
			if (data->top < screen_size_y(s))
				data->top = 0;
			else
				data->top -= screen_size_y(s);
		}
		window_choose_redraw_screen(wp);
		break;
	case MODEKEYCHOICE_PAGEDOWN:
		data->selected += screen_size_y(s);
		if (data->selected > items - 1)
			data->selected = items - 1;
		data->top += screen_size_y(s);
		if (screen_size_y(s) < items) {
			if (data->top + screen_size_y(s) > items)
				data->top = items - screen_size_y(s);
		} else
			data->top = 0;
		if (data->selected < data->top)
			data->top = data->selected;
		window_choose_redraw_screen(wp);
		break;
	default:
		idx = window_choose_index_key(data, key);
		if (idx < 0 || (u_int) idx >= ARRAY_LENGTH(&data->list))
			break;
		data->selected = idx;

		item = &ARRAY_ITEM(&data->list, data->selected);
		window_choose_fire_callback(wp, item->wcd);
		window_pane_reset_mode(wp);
		break;
	}
}

/* ARGSUSED */
void
window_choose_mouse(
    struct window_pane *wp, unused struct session *sess, struct mouse_event *m)
{
	struct window_choose_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	struct window_choose_mode_item	*item;
	u_int				 idx;

	if ((m->b & 3) == 3)
		return;
	if (m->x >= screen_size_x(s))
		return;
	if (m->y >= screen_size_y(s))
		return;

	idx = data->top + m->y;
	if (idx >= ARRAY_LENGTH(&data->list))
		return;
	data->selected = idx;

	item = &ARRAY_ITEM(&data->list, data->selected);
	window_choose_fire_callback(wp, item->wcd);
	window_pane_reset_mode(wp);
}

void
window_choose_write_line(
    struct window_pane *wp, struct screen_write_ctx *ctx, u_int py)
{
	struct window_choose_mode_data	*data = wp->modedata;
	struct window_choose_mode_item	*item;
	struct options			*oo = &wp->window->options;
	struct screen			*s = &data->screen;
	struct grid_cell		 gc;
	int				 utf8flag, key;

	if (data->callbackfn == NULL)
		fatalx("called before callback assigned");

	utf8flag = options_get_number(&wp->window->options, "utf8");
	memcpy(&gc, &grid_default_cell, sizeof gc);
	if (data->selected == data->top + py) {
		colour_set_fg(&gc, options_get_number(oo, "mode-fg"));
		colour_set_bg(&gc, options_get_number(oo, "mode-bg"));
		gc.attr |= options_get_number(oo, "mode-attr");
	}

	screen_write_cursormove(ctx, 0, py);
	if (data->top + py  < ARRAY_LENGTH(&data->list)) {
		item = &ARRAY_ITEM(&data->list, data->top + py);
		key = window_choose_key_index(data, data->top + py);
		if (key != -1) {
			screen_write_nputs(ctx, screen_size_x(s) - 1,
			    &gc, utf8flag, "(%c) %s", key, item->name);
		} else {
			screen_write_nputs(ctx, screen_size_x(s) - 1,
			    &gc, utf8flag, "    %s", item->name);
		}

	}
	while (s->cx < screen_size_x(s))
		screen_write_putc(ctx, &gc, ' ');
}

int
window_choose_key_index(struct window_choose_mode_data *data, u_int idx)
{
	static const char	keys[] = "0123456789abcdefghijklmnopqrstuvwxyz";
	const char	       *ptr;
	int			mkey;

	for (ptr = keys; *ptr != '\0'; ptr++) {
		mkey = mode_key_lookup(&data->mdata, *ptr);
		if (mkey != MODEKEY_NONE && mkey != MODEKEY_OTHER)
			continue;
		if (idx-- == 0)
			return (*ptr);
	}
	return (-1);
}

int
window_choose_index_key(struct window_choose_mode_data *data, int key)
{
	static const char	keys[] = "0123456789abcdefghijklmnopqrstuvwxyz";
	const char	       *ptr;
	int			mkey;
	u_int			idx = 0;

	for (ptr = keys; *ptr != '\0'; ptr++) {
		mkey = mode_key_lookup(&data->mdata, *ptr);
		if (mkey != MODEKEY_NONE && mkey != MODEKEY_OTHER)
			continue;
		if (key == *ptr)
			return (idx);
		idx++;
	}
	return (-1);
}

void
window_choose_redraw_screen(struct window_pane *wp)
{
	struct window_choose_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	struct screen_write_ctx	 	 ctx;
	u_int				 i;

	screen_write_start(&ctx, wp, NULL);
	for (i = 0; i < screen_size_y(s); i++)
		window_choose_write_line(wp, &ctx, i);
	screen_write_stop(&ctx);
}

void
window_choose_scroll_up(struct window_pane *wp)
{
	struct window_choose_mode_data	*data = wp->modedata;
	struct screen_write_ctx		 ctx;

	if (data->top == 0)
		return;
	data->top--;

	screen_write_start(&ctx, wp, NULL);
	screen_write_cursormove(&ctx, 0, 0);
	screen_write_insertline(&ctx, 1);
	window_choose_write_line(wp, &ctx, 0);
	if (screen_size_y(&data->screen) > 1)
		window_choose_write_line(wp, &ctx, 1);
	screen_write_stop(&ctx);
}

void
window_choose_scroll_down(struct window_pane *wp)
{
	struct window_choose_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	struct screen_write_ctx		 ctx;

	if (data->top >= ARRAY_LENGTH(&data->list))
		return;
	data->top++;

	screen_write_start(&ctx, wp, NULL);
	screen_write_cursormove(&ctx, 0, 0);
	screen_write_deleteline(&ctx, 1);
	window_choose_write_line(wp, &ctx, screen_size_y(s) - 1);
	if (screen_size_y(&data->screen) > 1)
		window_choose_write_line(wp, &ctx, screen_size_y(s) - 2);
	screen_write_stop(&ctx);
}

void
window_choose_ctx(struct window_choose_data *cdata)
{
	struct cmd_ctx		 ctx;
	struct cmd_list		*cmdlist;
	char			*template, *cause;

	template = cmd_template_replace(cdata->action,
			cdata->raw_format, 1);

	if (cmd_string_parse(template, &cmdlist, &cause) != 0) {
		if (cause != NULL) {
			*cause = toupper((u_char) *cause);
			status_message_set(cdata->client, "%s", cause);
			xfree(cause);
		}
		xfree(template);
		return;
	}
	xfree(template);

	ctx.msgdata = NULL;
	ctx.curclient = cdata->client;

	ctx.error = key_bindings_error;
	ctx.print = key_bindings_print;
	ctx.info = key_bindings_info;

	ctx.cmdclient = NULL;

	cmd_list_exec(cmdlist, &ctx);
	cmd_list_free(cmdlist);
}