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Extend the #[] style syntax and use that together with previous format
changes to allow the status line to be entirely configured with a single
option.

Now that it is possible to configure their content, enable the existing
code that lets the status line be multiple lines in height. The status
option can now take a value of 2, 3, 4 or 5 (as well as the previous on
or off) to configure more than one line. The new status-format array
option configures the format of each line, the default just references
the existing status-* options, although some of the more obscure status
options may be eliminated in time.

Additions to the #[] syntax are: "align" to specify alignment (left,
centre, right), "list" for the window list and "range" to configure
ranges of text for the mouse bindings.

The "align" keyword can also be used to specify alignment of entries in
tree mode and the pane status lines.

/* $OpenBSD: window-client.c,v 1.21 2019/03/18 20:53:33 nicm Exp $ */

/*
 * Copyright (c) 2017 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 <sys/time.h>

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

#include "tmux.h"

static struct screen	*window_client_init(struct window_mode_entry *,
			     struct cmd_find_state *, struct args *);
static void		 window_client_free(struct window_mode_entry *);
static void		 window_client_resize(struct window_mode_entry *, u_int,
			     u_int);
static void		 window_client_key(struct window_mode_entry *,
			     struct client *, struct session *,
			     struct winlink *, key_code, struct mouse_event *);

#define WINDOW_CLIENT_DEFAULT_COMMAND "detach-client -t '%%'"

#define WINDOW_CLIENT_DEFAULT_FORMAT \
	"session #{session_name} " \
	"(#{client_width}x#{client_height}, #{t:client_activity})"

const struct window_mode window_client_mode = {
	.name = "client-mode",
	.default_format = WINDOW_CLIENT_DEFAULT_FORMAT,

	.init = window_client_init,
	.free = window_client_free,
	.resize = window_client_resize,
	.key = window_client_key,
};

enum window_client_sort_type {
	WINDOW_CLIENT_BY_NAME,
	WINDOW_CLIENT_BY_SIZE,
	WINDOW_CLIENT_BY_CREATION_TIME,
	WINDOW_CLIENT_BY_ACTIVITY_TIME,
};
static const char *window_client_sort_list[] = {
	"name",
	"size",
	"creation",
	"activity"
};

struct window_client_itemdata {
	struct client	*c;
};

struct window_client_modedata {
	struct mode_tree_data		 *data;
	char				 *format;
	char				 *command;

	struct window_client_itemdata	**item_list;
	u_int				  item_size;
};

static struct window_client_itemdata *
window_client_add_item(struct window_client_modedata *data)
{
	struct window_client_itemdata	*item;

	data->item_list = xreallocarray(data->item_list, data->item_size + 1,
	    sizeof *data->item_list);
	item = data->item_list[data->item_size++] = xcalloc(1, sizeof *item);
	return (item);
}

static void
window_client_free_item(struct window_client_itemdata *item)
{
	server_client_unref(item->c);
	free(item);
}

static int
window_client_cmp_name(const void *a0, const void *b0)
{
	const struct window_client_itemdata *const *a = a0;
	const struct window_client_itemdata *const *b = b0;

	return (strcmp((*a)->c->name, (*b)->c->name));
}

static int
window_client_cmp_size(const void *a0, const void *b0)
{
	const struct window_client_itemdata *const *a = a0;
	const struct window_client_itemdata *const *b = b0;

	if ((*a)->c->tty.sx < (*b)->c->tty.sx)
		return (-1);
	if ((*a)->c->tty.sx > (*b)->c->tty.sx)
		return (1);
	if ((*a)->c->tty.sy < (*b)->c->tty.sy)
		return (-1);
	if ((*a)->c->tty.sy > (*b)->c->tty.sy)
		return (1);
	return (strcmp((*a)->c->name, (*b)->c->name));
}

static int
window_client_cmp_creation_time(const void *a0, const void *b0)
{
	const struct window_client_itemdata *const *a = a0;
	const struct window_client_itemdata *const *b = b0;

	if (timercmp(&(*a)->c->creation_time, &(*b)->c->creation_time, >))
		return (-1);
	if (timercmp(&(*a)->c->creation_time, &(*b)->c->creation_time, <))
		return (1);
	return (strcmp((*a)->c->name, (*b)->c->name));
}

static int
window_client_cmp_activity_time(const void *a0, const void *b0)
{
	const struct window_client_itemdata *const *a = a0;
	const struct window_client_itemdata *const *b = b0;

	if (timercmp(&(*a)->c->activity_time, &(*b)->c->activity_time, >))
		return (-1);
	if (timercmp(&(*a)->c->activity_time, &(*b)->c->activity_time, <))
		return (1);
	return (strcmp((*a)->c->name, (*b)->c->name));
}

static void
window_client_build(void *modedata, u_int sort_type, __unused uint64_t *tag,
    const char *filter)
{
	struct window_client_modedata	*data = modedata;
	struct window_client_itemdata	*item;
	u_int				 i;
	struct client			*c;
	char				*text, *cp;

	for (i = 0; i < data->item_size; i++)
		window_client_free_item(data->item_list[i]);
	free(data->item_list);
	data->item_list = NULL;
	data->item_size = 0;

	TAILQ_FOREACH(c, &clients, entry) {
		if (c->session == NULL || (c->flags & (CLIENT_DETACHING)))
			continue;

		item = window_client_add_item(data);
		item->c = c;

		c->references++;
	}

	switch (sort_type) {
	case WINDOW_CLIENT_BY_NAME:
		qsort(data->item_list, data->item_size, sizeof *data->item_list,
		    window_client_cmp_name);
		break;
	case WINDOW_CLIENT_BY_SIZE:
		qsort(data->item_list, data->item_size, sizeof *data->item_list,
		    window_client_cmp_size);
		break;
	case WINDOW_CLIENT_BY_CREATION_TIME:
		qsort(data->item_list, data->item_size, sizeof *data->item_list,
		    window_client_cmp_creation_time);
		break;
	case WINDOW_CLIENT_BY_ACTIVITY_TIME:
		qsort(data->item_list, data->item_size, sizeof *data->item_list,
		    window_client_cmp_activity_time);
		break;
	}

	for (i = 0; i < data->item_size; i++) {
		item = data->item_list[i];
		c = item->c;

		if (filter != NULL) {
			cp = format_single(NULL, filter, c, NULL, NULL, NULL);
			if (!format_true(cp)) {
				free(cp);
				continue;
			}
			free(cp);
		}

		text = format_single(NULL, data->format, c, NULL, NULL, NULL);
		mode_tree_add(data->data, NULL, item, (uint64_t)c, c->name,
		    text, -1);
		free(text);
	}
}

static void
window_client_draw(__unused void *modedata, void *itemdata,
    struct screen_write_ctx *ctx, u_int sx, u_int sy)
{
	struct window_client_itemdata	*item = itemdata;
	struct client			*c = item->c;
	struct screen			*s = ctx->s;
	struct window_pane		*wp;
	u_int				 cx = s->cx, cy = s->cy, lines, at;

	if (c->session == NULL || (c->flags & (CLIENT_DEAD|CLIENT_DETACHING)))
		return;
	wp = c->session->curw->window->active;

	lines = status_line_size(c);
	if (lines >= sy)
		lines = 0;
	if (status_at_line(c) == 0)
		at = lines;
	else
		at = 0;

	screen_write_cursormove(ctx, cx, cy + at, 0);
	screen_write_preview(ctx, &wp->base, sx, sy - 2 - lines);

	if (at != 0)
		screen_write_cursormove(ctx, cx, cy + 2, 0);
	else
		screen_write_cursormove(ctx, cx, cy + sy - 1 - lines, 0);
	screen_write_hline(ctx, sx, 0, 0);

	if (at != 0)
		screen_write_cursormove(ctx, cx, cy, 0);
	else
		screen_write_cursormove(ctx, cx, cy + sy - lines, 0);
	screen_write_fast_copy(ctx, &c->status.screen, 0, 0, sx, lines);
}

static struct screen *
window_client_init(struct window_mode_entry *wme,
    __unused struct cmd_find_state *fs, struct args *args)
{
	struct window_pane		*wp = wme->wp;
	struct window_client_modedata	*data;
	struct screen			*s;

	wme->data = data = xcalloc(1, sizeof *data);

	if (args == NULL || !args_has(args, 'F'))
		data->format = xstrdup(WINDOW_CLIENT_DEFAULT_FORMAT);
	else
		data->format = xstrdup(args_get(args, 'F'));
	if (args == NULL || args->argc == 0)
		data->command = xstrdup(WINDOW_CLIENT_DEFAULT_COMMAND);
	else
		data->command = xstrdup(args->argv[0]);

	data->data = mode_tree_start(wp, args, window_client_build,
	    window_client_draw, NULL, data, window_client_sort_list,
	    nitems(window_client_sort_list), &s);
	mode_tree_zoom(data->data, args);

	mode_tree_build(data->data);
	mode_tree_draw(data->data);

	return (s);
}

static void
window_client_free(struct window_mode_entry *wme)
{
	struct window_client_modedata	*data = wme->data;
	u_int				 i;

	if (data == NULL)
		return;

	mode_tree_free(data->data);

	for (i = 0; i < data->item_size; i++)
		window_client_free_item(data->item_list[i]);
	free(data->item_list);

	free(data->format);
	free(data->command);

	free(data);
}

static void
window_client_resize(struct window_mode_entry *wme, u_int sx, u_int sy)
{
	struct window_client_modedata	*data = wme->data;

	mode_tree_resize(data->data, sx, sy);
}

static void
window_client_do_detach(void* modedata, void *itemdata,
    __unused struct client *c, key_code key)
{
	struct window_client_modedata	*data = modedata;
	struct window_client_itemdata	*item = itemdata;

	if (item == mode_tree_get_current(data->data))
		mode_tree_down(data->data, 0);
	if (key == 'd' || key == 'D')
		server_client_detach(item->c, MSG_DETACH);
	else if (key == 'x' || key == 'X')
		server_client_detach(item->c, MSG_DETACHKILL);
	else if (key == 'z' || key == 'Z')
		server_client_suspend(item->c);
}

static void
window_client_key(struct window_mode_entry *wme, struct client *c,
    __unused struct session *s, __unused struct winlink *wl, key_code key,
    struct mouse_event *m)
{
	struct window_pane		*wp = wme->wp;
	struct window_client_modedata	*data = wme->data;
	struct mode_tree_data		*mtd = data->data;
	struct window_client_itemdata	*item;
	int				 finished;

	finished = mode_tree_key(mtd, c, &key, m, NULL, NULL);
	switch (key) {
	case 'd':
	case 'x':
	case 'z':
		item = mode_tree_get_current(mtd);
		window_client_do_detach(data, item, c, key);
		mode_tree_build(mtd);
		break;
	case 'D':
	case 'X':
	case 'Z':
		mode_tree_each_tagged(mtd, window_client_do_detach, c, key, 0);
		mode_tree_build(mtd);
		break;
	case '\r':
		item = mode_tree_get_current(mtd);
		mode_tree_run_command(c, NULL, data->command, item->c->ttyname);
		finished = 1;
		break;
	}
	if (finished || server_client_how_many() == 0)
		window_pane_reset_mode(wp);
	else {
		mode_tree_draw(mtd);
		wp->flags |= PANE_REDRAW;
	}
}