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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: style.c,v 1.18 2019/03/18 20:53:33 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
 * Copyright (c) 2014 Tiago Cunha <tcunha@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 <stdlib.h>
#include <string.h>

#include "tmux.h"

/* Mask for bits not included in style. */
#define STYLE_ATTR_MASK (~GRID_ATTR_CHARSET)

/* Default style. */
static struct style style_default = {
	{ 0, 0, 8, 8, { { ' ' }, 0, 1, 1 } },

	STYLE_ALIGN_DEFAULT,
	STYLE_LIST_OFF,

	STYLE_RANGE_NONE, 0
};

/*
 * Parse an embedded style of the form "fg=colour,bg=colour,bright,...".
 * Note that this adds onto the given style, so it must have been initialized
 * alredy.
 */
int
style_parse(struct style *sy, const struct grid_cell *base, const char *in)
{
	struct style	saved;
	const char	delimiters[] = " ,", *cp;
	char		tmp[256], *found;
	int		value;
	size_t		end;

	if (*in == '\0')
		return (0);
	style_copy(&saved, sy);

	do {
		while (*in != '\0' && strchr(delimiters, *in) != NULL) {
			in++;
			end--;
		}
		if (*in == '\0')
			break;

		end = strcspn(in, delimiters);
		if (end > (sizeof tmp) - 1)
			goto error;
		memcpy(tmp, in, end);
		tmp[end] = '\0';

		if (strcasecmp(tmp, "default") == 0) {
			sy->gc.fg = base->fg;
			sy->gc.bg = base->bg;
			sy->gc.attr = base->attr;
			sy->gc.flags = base->flags;
		} else if (strcasecmp(tmp, "nolist") == 0)
			sy->list = STYLE_LIST_OFF;
		else if (strncasecmp(tmp, "list=", 5) == 0) {
			if (strcasecmp(tmp + 5, "on") == 0)
				sy->list = STYLE_LIST_ON;
			else if (strcasecmp(tmp + 5, "focus") == 0)
				sy->list = STYLE_LIST_FOCUS;
			else if (strcasecmp(tmp + 5, "left-marker") == 0)
				sy->list = STYLE_LIST_LEFT_MARKER;
			else if (strcasecmp(tmp + 5, "right-marker") == 0)
				sy->list = STYLE_LIST_RIGHT_MARKER;
			else
				goto error;
		} else if (strcasecmp(tmp, "norange") == 0) {
			sy->range_type = style_default.range_type;
			sy->range_argument = style_default.range_type;
		} else if (end > 6 && strncasecmp(tmp, "range=", 6) == 0) {
			found = strchr(tmp + 6, '|');
			if (found != NULL) {
				*found++ = '\0';
				if (*found == '\0')
					goto error;
				for (cp = found; *cp != '\0'; cp++) {
					if (!isdigit((u_char)*cp))
						goto error;
				}
			}
			if (strcasecmp(tmp + 6, "left") == 0) {
				if (found != NULL)
					goto error;
				sy->range_type = STYLE_RANGE_LEFT;
				sy->range_argument = 0;
			} else if (strcasecmp(tmp + 6, "right") == 0) {
				if (found != NULL)
					goto error;
				sy->range_type = STYLE_RANGE_RIGHT;
				sy->range_argument = 0;
			} else if (strcasecmp(tmp + 6, "window") == 0) {
				if (found == NULL)
					goto error;
				sy->range_type = STYLE_RANGE_WINDOW;
				sy->range_argument = atoi(found);
			}
		} else if (strcasecmp(tmp, "noalign") == 0)
			sy->align = style_default.align;
		else if (end > 6 && strncasecmp(tmp, "align=", 6) == 0) {
			if (strcasecmp(tmp + 6, "left") == 0)
				sy->align = STYLE_ALIGN_LEFT;
			else if (strcasecmp(tmp + 6, "centre") == 0)
				sy->align = STYLE_ALIGN_CENTRE;
			else if (strcasecmp(tmp + 6, "right") == 0)
				sy->align = STYLE_ALIGN_RIGHT;
			else
				goto error;
		} else if (end > 3 && strncasecmp(tmp + 1, "g=", 2) == 0) {
			if ((value = colour_fromstring(tmp + 3)) == -1)
				goto error;
			if (*in == 'f' || *in == 'F') {
				if (value != 8)
					sy->gc.fg = value;
				else
					sy->gc.fg = base->fg;
			} else if (*in == 'b' || *in == 'B') {
				if (value != 8)
					sy->gc.bg = value;
				else
					sy->gc.bg = base->bg;
			} else
				goto error;
		} else if (strcasecmp(tmp, "none") == 0)
			sy->gc.attr = 0;
		else if (end > 2 && strncasecmp(tmp, "no", 2) == 0) {
			if ((value = attributes_fromstring(tmp + 2)) == -1)
				goto error;
			sy->gc.attr &= ~value;
		} else {
			if ((value = attributes_fromstring(tmp)) == -1)
				goto error;
			sy->gc.attr |= value;
		}

		in += end + strspn(in + end, delimiters);
	} while (*in != '\0');

	return (0);

error:
	style_copy(sy, &saved);
	return (-1);
}

/* Convert style to a string. */
const char *
style_tostring(struct style *sy)
{
	struct grid_cell	*gc = &sy->gc;
	int			 off = 0;
	const char		*comma = "", *tmp;
	static char		 s[256];
	char			 b[16];

	*s = '\0';

	if (sy->list != STYLE_LIST_OFF) {
		if (sy->list == STYLE_LIST_ON)
			tmp = "on";
		else if (sy->list == STYLE_LIST_FOCUS)
			tmp = "focus";
		else if (sy->list == STYLE_LIST_LEFT_MARKER)
			tmp = "left-marker";
		else if (sy->list == STYLE_LIST_RIGHT_MARKER)
			tmp = "right-marker";
		off += xsnprintf(s + off, sizeof s - off, "%slist=%s", comma,
		    tmp);
		comma = ",";
	}
	if (sy->range_type != STYLE_RANGE_NONE) {
		if (sy->range_type == STYLE_RANGE_LEFT)
			tmp = "left";
		else if (sy->range_type == STYLE_RANGE_RIGHT)
			tmp = "right";
		else if (sy->range_type == STYLE_RANGE_WINDOW) {
			snprintf(b, sizeof b, "window|%u", sy->range_argument);
			tmp = b;
		}
		off += xsnprintf(s + off, sizeof s - off, "%srange=%s", comma,
		    tmp);
		comma = ",";
	}
	if (sy->align != STYLE_ALIGN_DEFAULT) {
		if (sy->align == STYLE_ALIGN_LEFT)
			tmp = "left";
		else if (sy->align == STYLE_ALIGN_CENTRE)
			tmp = "centre";
		else if (sy->align == STYLE_ALIGN_RIGHT)
			tmp = "right";
		off += xsnprintf(s + off, sizeof s - off, "%salign=%s", comma,
		    tmp);
		comma = ",";
	}
	if (gc->fg != 8) {
		off += xsnprintf(s + off, sizeof s - off, "%sfg=%s", comma,
		    colour_tostring(gc->fg));
		comma = ",";
	}
	if (gc->bg != 8) {
		off += xsnprintf(s + off, sizeof s - off, "%sbg=%s", comma,
		    colour_tostring(gc->bg));
		comma = ",";
	}
	if (gc->attr != 0 && gc->attr != GRID_ATTR_CHARSET) {
		xsnprintf(s + off, sizeof s - off, "%s%s", comma,
		    attributes_tostring(gc->attr));
		comma = ",";
	}

	if (*s == '\0')
		return ("default");
	return (s);
}

/* Apply a style. */
void
style_apply(struct grid_cell *gc, struct options *oo, const char *name)
{
	struct style	*sy;

	memcpy(gc, &grid_default_cell, sizeof *gc);
	sy = options_get_style(oo, name);
	gc->fg = sy->gc.fg;
	gc->bg = sy->gc.bg;
	gc->attr |= sy->gc.attr;
}

/* Apply a style, updating if default. */
void
style_apply_update(struct grid_cell *gc, struct options *oo, const char *name)
{
	struct style	*sy;

	sy = options_get_style(oo, name);
	if (sy->gc.fg != 8)
		gc->fg = sy->gc.fg;
	if (sy->gc.bg != 8)
		gc->bg = sy->gc.bg;
	if (sy->gc.attr != 0)
		gc->attr |= sy->gc.attr;
}

/* Initialize style from cell. */
void
style_set(struct style *sy, const struct grid_cell *gc)
{
	memcpy(sy, &style_default, sizeof *sy);
	memcpy(&sy->gc, gc, sizeof sy->gc);
}

/* Copy style. */
void
style_copy(struct style *dst, struct style *src)
{
	memcpy(dst, src, sizeof *dst);
}

/* Check if two styles are (visibly) the same. */
int
style_equal(struct style *sy1, struct style *sy2)
{
	struct grid_cell	*gc1 = &sy1->gc;
	struct grid_cell	*gc2 = &sy2->gc;

	if (gc1->fg != gc2->fg)
		return (0);
	if (gc1->bg != gc2->bg)
		return (0);
	if ((gc1->attr & STYLE_ATTR_MASK) != (gc2->attr & STYLE_ATTR_MASK))
		return (0);
	if (sy1->align != sy2->align)
		return (0);
	return (1);
}

/* Is this style default? */
int
style_is_default(struct style *sy)
{
	return (style_equal(sy, &style_default));
}