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/*
 * calmwm - the calm window manager
 *
 * Copyright (c) 2004 Andy Adamson <dros@monkey.org>
 * Copyright (c) 2004,2005 Marius Aamodt Eriksen <marius@monkey.org>
 *
 * 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 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.
 *
 * $Id: group.c,v 1.7 2008/03/22 21:34:07 okan Exp $
 */

#include "headers.h"
#include "calmwm.h"

#define CALMWM_NGROUPS 9

int                 Groupnamemode = 0;
struct group_ctx   *Group_active = NULL;
struct group_ctx    Groups[CALMWM_NGROUPS];
char                Group_name[256];
int                 Grouphideall = 0;
struct group_ctx_q  Groupq;

static char *shortcut_to_name[] = {
	"XXX", "one", "two", "three",
	"four", "five", "six", "seven",
	"eight", "nine",
};

static void
_group_add(struct group_ctx *gc, struct client_ctx *cc)
{
	if (cc == NULL || gc == NULL)
	  	errx(1, "_group_add: a ctx is NULL");

	if (cc->group == gc)
		return;

	if (cc->group != NULL)
		TAILQ_REMOVE(&cc->group->clients, cc, group_entry);

	TAILQ_INSERT_TAIL(&gc->clients, cc, group_entry);
	cc->group = gc;
}

static void
_group_remove(struct client_ctx *cc)
{
	if (cc == NULL || cc->group == NULL)
	  	errx(1, "_group_remove: a ctx is NULL");

	TAILQ_REMOVE(&cc->group->clients, cc, group_entry);
	cc->group = NULL;
	cc->highlight = 0;
	client_draw_border(cc);
}

static void
_group_hide(struct group_ctx *gc)
{
  	struct client_ctx *cc;

	screen_updatestackingorder();

	gc->nhidden = 0;
	gc->highstack = 0;
	TAILQ_FOREACH(cc, &gc->clients, group_entry) {
		client_hide(cc);
		gc->nhidden++;
		if (cc->stackingorder > gc->highstack)
			gc->highstack = cc->stackingorder;
	}
	gc->hidden = 1;		/* XXX: equivalent to gc->nhidden > 0 */
}

static void
_group_show(struct group_ctx *gc)
{
	struct client_ctx *cc;
	Window *winlist;
	u_int i;
	int lastempty = -1;

	winlist = (Window *) xcalloc(sizeof(*winlist) * (gc->highstack + 1));

	/*
	 * Invert the stacking order as XRestackWindows() expects them
	 * top-to-bottom.
	 */
	TAILQ_FOREACH(cc, &gc->clients, group_entry) {
		winlist[gc->highstack - cc->stackingorder] = cc->pwin;
		client_unhide(cc);
	}

	/* Un-sparseify */
	for (i = 0; i <= gc->highstack; i++) {
		if (!winlist[i] && lastempty == -1)
			lastempty = i;
		else if (winlist[i] && lastempty != -1) {
			winlist[lastempty] = winlist[i];
			if (++lastempty == i)
				lastempty = -1;
		}
	}

	XRestackWindows(X_Dpy, winlist, gc->nhidden);
	xfree(winlist);

	gc->hidden = 0;
	Group_active = gc;
}

void
group_init(void)
{
  	int i;

	TAILQ_INIT(&Groupq);

	for (i = 0; i < CALMWM_NGROUPS; i++) {
		TAILQ_INIT(&Groups[i].clients);
		Groups[i].hidden = 0;
		Groups[i].shortcut = i + 1;
		TAILQ_INSERT_TAIL(&Groupq, &Groups[i], entry);
	}

	Group_active = &Groups[0];
}

/*
 * Colouring for groups upon add/remove.
 */
void
group_sticky_toggle_enter(struct client_ctx *cc)
{
	struct group_ctx *gc = Group_active;

	if (gc == cc->group) {
		_group_remove(cc);
		cc->highlight = CLIENT_HIGHLIGHT_RED;
	} else {
		_group_add(gc, cc);
		cc->highlight = CLIENT_HIGHLIGHT_BLUE;
	}

	client_draw_border(cc);
}

void
group_sticky_toggle_exit(struct client_ctx *cc)
{
	cc->highlight = 0;
	client_draw_border(cc);
}

/*
 * selection list display 
 */

/* if group_hidetoggle would produce no effect, toggle the group's hidden state
 */
void
_group_fix_hidden_state(struct group_ctx *gc)
{
	struct client_ctx *cc;	
	int same = 0;

	TAILQ_FOREACH(cc, &gc->clients, group_entry) {
		if (gc->hidden == ((cc->flags & CLIENT_HIDDEN) ? 1 : 0))
			same++;
	}

	if (same == 0)
		gc->hidden = !gc->hidden;
}

void
group_hidetoggle(int idx)
{
	struct group_ctx *gc;
#ifdef notyet
	char buf[128];
#endif

	if (idx < 0 || idx >= CALMWM_NGROUPS)
		err(1, "group_hidetoggle: index out of range (%d)", idx);

	gc = &Groups[idx];

	_group_fix_hidden_state(gc);

	if (gc->hidden)
		_group_show(gc);
	else {
		_group_hide(gc);
		if (TAILQ_EMPTY(&gc->clients))
			Group_active = gc;
	}

#ifdef notyet
	snprintf(buf, sizeof(buf), "Group %d", idx + 1);
	screen_infomsg(buf);
#endif
}

#define GROUP_NEXT(gc, fwd) (fwd) ?					\
	TAILQ_NEXT(gc, entry) : TAILQ_PREV(gc, group_ctx_q, entry)

/*
 * Jump to the next/previous active group.  If none exist, then just
 * stay put.
 */
void
group_slide(int fwd)
{
	struct group_ctx *gc, *showgroup = NULL;

	assert(Group_active != NULL);

	gc = Group_active;
	for (;;) {
		gc = GROUP_NEXT(gc, fwd);
		if (gc == NULL)
			gc = fwd ? TAILQ_FIRST(&Groupq) :
			    TAILQ_LAST(&Groupq, group_ctx_q);
		if (gc == Group_active)
			break;

		if (!TAILQ_EMPTY(&gc->clients) && showgroup == NULL)
			showgroup = gc;
		else if (!gc->hidden)
			_group_hide(gc);
	}

	if (showgroup == NULL)
		return;

	_group_hide(Group_active);

	if (showgroup->hidden)
		_group_show(showgroup);
	else
		Group_active = showgroup;
}

/* called when a client is deleted */
void
group_client_delete(struct client_ctx *cc)
{
	if (cc->group == NULL)
	  	return;

	TAILQ_REMOVE(&cc->group->clients, cc, group_entry);
	cc->group = NULL; /* he he */
}

void
group_menu(XButtonEvent *e)
{
  	struct menu_q menuq;
	struct menu  *mi;
	int i;
	struct group_ctx *gc;

	TAILQ_INIT(&menuq);

	for (i = 0; i < CALMWM_NGROUPS; i++) {
		gc = &Groups[i];

		if (TAILQ_EMPTY(&gc->clients))
			continue;

		if (gc->name == NULL)
			gc->name = xstrdup(shortcut_to_name[gc->shortcut]);

		XCALLOC(mi, struct menu);
		if (gc->hidden)
			snprintf(mi->text, sizeof(mi->text), "%d: [%s]",
			   gc->shortcut, gc->name); 
		else
			snprintf(mi->text, sizeof(mi->text), "%d: %s",
			   gc->shortcut, gc->name); 
		mi->ctx = gc;
		TAILQ_INSERT_TAIL(&menuq, mi, entry);
	}

	if (TAILQ_EMPTY(&menuq))
		return;

	mi = (struct menu *)grab_menu(e, &menuq);

	if (mi == NULL || mi->ctx == NULL)
		goto cleanup;

	gc = (struct group_ctx *)mi->ctx;

	if (gc->hidden)
		_group_show(gc);
	else
		_group_hide(gc);

 cleanup:
	while ((mi = TAILQ_FIRST(&menuq)) != NULL) {
		TAILQ_REMOVE(&menuq, mi, entry);
		xfree(mi);
	}
}

void
group_alltoggle(void)
{
	int i;

	for (i=0; i < CALMWM_NGROUPS; i++) {
		if (Grouphideall)
			_group_show(&Groups[i]);
		else
		  	_group_hide(&Groups[i]);
	}

	if (Grouphideall)
		Grouphideall = 0;
	else
		Grouphideall = 1;
}

void
group_autogroup(struct client_ctx *cc)
{
	struct autogroupwin *aw;
	struct group_ctx *gc;
	char group[CALMWM_MAXNAMELEN];

	if (cc->app_class == NULL || cc->app_name == NULL)
		return;

	TAILQ_FOREACH(aw, &Conf.autogroupq, entry) {
		if (strcmp(aw->class, cc->app_class) == 0 &&
		    (aw->name == NULL || strcmp(aw->name, cc->app_name) == 0)) {
			strlcpy(group, aw->group, sizeof(group));
			break;
		}
	}

	TAILQ_FOREACH(gc, &Groupq, entry) {
		if (strcmp(shortcut_to_name[gc->shortcut], group) == 0) {
			_group_add(gc, cc);
			return;
		}
	}

	if (Conf.flags & CONF_STICKY_GROUPS)
		_group_add(Group_active, cc);

}