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* 4266 - space for alloc-id in heap allocationsKartik Agaram2018-06-241-17/+27
| | | | This has taken me almost 6 weeks :(
* 4258 - undo 4257Kartik Agaram2018-06-151-17/+14
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* 4257 - abortive attempt at safe fat pointersKartik Agaram2018-06-151-14/+17
| | | | | | | | | | | | | | | | I've been working on this slowly over several weeks, but it's too hard to support 0 as the null value for addresses. I constantly have to add exceptions for scalar value corresponding to an address type (now occupying 2 locations). The final straw is the test for 'reload': x:num <- reload text 'reload' returns an address. But there's no way to know that for arbitrary instructions. New plan: let's put this off for a bit and first create support for literals. Then use 'null' instead of '0' for addresses everywhere. Then it'll be easy to just change what 'null' means.
* 4179 - experiment: rip out memory reclamationKartik K. Agaram2018-01-031-15/+10
| | | | | | | | | | | | | | | | | | | | | I have a plan for a way to avoid use-after-free errors without all the overheads of maintaining refcounts. Has the nice side-effect of requiring manual memory management. The Mu way is to leak memory by default and build tools to help decide when and where to expend effort plugging memory leaks. Arguably programs should be distributed with summaries of their resource use characteristics. Eliminating refcount maintenance reduces time to run tests by 30% for `mu edit`: this commit parent mu test: 3.9s 4.5s mu test edit: 2:38 3:48 Open questions: - making reclamation easier; some sort of support for destructors - reclaiming local scopes (which are allocated on the heap) - should we support automatically reclaiming allocations inside them?
* 4178Kartik K. Agaram2017-12-311-2/+1
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* 3999Kartik K. Agaram2017-09-151-2/+2
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* 3707Kartik K. Agaram2016-12-121-1/+2
| | | | | | | | | | | | | | | | | | Be more disciplined about tagging 2 different concepts in the codebase: a) Use the phrase "later layers" to highlight places where a layer doesn't have the simplest possible self-contained implementation. b) Use the word "hook" to point out functions that exist purely to provide waypoints for extension by future layers. Since both these only make sense in the pre-tangled representation of the codebase, using '//:' and '#:' comments to get them stripped out of tangled output. (Though '#:' comments still make it to tangled output at the moment. Let's see if we use it enough to be worth supporting. Scenarios are pretty unreadable in tangled output anyway.)
* 3522Kartik K. Agaram2016-10-191-1/+1
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* 3394Kartik K. Agaram2016-09-171-2/+2
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* 3393Kartik K. Agaram2016-09-171-2/+2
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* 3390Kartik K. Agaram2016-09-171-4/+4
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* 3389Kartik K. Agaram2016-09-171-2/+2
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* 3380Kartik K. Agaram2016-09-171-7/+7
| | | | | One more place we were missing expanding type abbreviations: inside container definitions.
* 3239Kartik K. Agaram2016-08-211-3/+3
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* 3214Kartik K. Agaram2016-08-171-0/+3
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* 2990Kartik K. Agaram2016-05-201-1/+1
| | | | | | | | | | Standardize quotes around reagents in error messages. I'm still sure there's issues. For example, the messages when type-checking 'copy'. I'm not putting quotes around them because in layer 60 I end up creating dilated reagents, and then it's a bit much to have quotes and (two kinds of) brackets. But I'm sure I'm doing that somewhere..
* 2864 - replace all address:shared with just addressKartik K. Agaram2016-04-241-4/+4
| | | | | | | Now that we no longer have non-shared addresses, we can just always track refcounts for all addresses. Phew!
* 2773 - switch to 'int'Kartik K. Agaram2016-03-131-7/+7
| | | | This should eradicate the issue of 2771.
* 2735 - define recipes using 'def'Kartik K. Agaram2016-03-081-3/+3
| | | | | | | | | | | | I'm dropping all mention of 'recipe' terminology from the Readme. That way I hope to avoid further bike-shedding discussions while I very slowly decide on the right terminology with my students. I could be smarter in my error messages and use 'recipe' when code uses it and 'function' otherwise. But what about other words like ingredient? It would all add complexity that I'm not yet sure is worthwhile. But I do want separate experiences for veteran programmers reading about Mu on github and for people learning programming using Mu.
* 2712Kartik K. Agaram2016-02-261-1/+1
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* 2707Kartik K. Agaram2016-02-251-4/+1
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* 2681 - drop reagent types from reagent propertiesKartik K. Agaram2016-02-211-1/+1
| | | | | | | | | | | | | | | | | All my attempts at staging this change failed with this humongous commit that took all day and involved debugging three monstrous bugs. Two of the bugs had to do with forgetting to check the type name in the implementation of shape-shifting recipes. Bug #2 in particular would cause core tests in layer 59 to fail -- only when I loaded up edit/! It got me to just hack directly on mu.cc until I figured out the cause (snapshot saved in mu.cc.modified). The problem turned out to be that I accidentally saved a type ingredient in the Type table during specialization. Now I know that that can be very bad. I've checked the traces for any stray type numbers (rather than names). I also found what might be a bug from last November (labeled TODO), but we'll verify after this commit.
* 2581 - make space for the refcount in address:sharedKartik K. Agaram2016-01-201-11/+19
| | | | | | | | | | | We don't yet actually maintain the refcount. That's next. Hardest part of this was debugging the assume-console scenarios in layer 85. That took some detailed manual diffing of traces (because the output of diff was no good). New tracing added in this commit add 8% to .traces LoC. Commented out trace() calls (used during debugging) make that 45%.
* 2576 - distinguish allocated addresses from othersKartik K. Agaram2016-01-191-2/+2
| | | | | | | | | | | | | | | | This is the one major refinement on the C programming model I'm planning to introduce in mu. Instead of Rust's menagerie of pointer types and static checking, I want to introduce just one new type, and use it to perform ref-counting at runtime. So far all we're doing is updating new's interface. The actual ref-counting implementation is next. One implication: I might sometimes need duplicate implementations for a recipe with allocated vs vanilla addresses of the same type. So far it seems I can get away with just always passing in allocated addresses; the situations when you want to pass an unallocated address to a recipe should be few and far between.
* 2571Kartik K. Agaram2016-01-191-0/+57
| | | | | Reorganize layers in preparation for a better way to manage heap allocations without ever risking use-after-free errors.
* 1768Kartik K. Agaram2015-07-131-60/+0
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* 1434 - support all unicode spacesKartik K. Agaram2015-05-231-1/+9
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* 1414 - traces now robust to new recipes/typesKartik K. Agaram2015-05-211-3/+3
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* 1391 - avoid unsigned integersKartik K. Agaram2015-05-171-7/+7
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* 1387Kartik K. Agaram2015-05-161-1/+1
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* 1364 - trace call-stack when switching routinesKartik K. Agaram2015-05-131-1/+1
| | | | Drop the #$%# 'encapsulated' stack ADT.
* 1363 - rename 'integer' to 'number'Kartik K. Agaram2015-05-131-4/+4
| | | | ..now that we support non-integers.
* 1357 - temporarily revert floating-point supportKartik K. Agaram2015-05-121-2/+2
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* 1356 - snapshot #2: floating point supportKartik K. Agaram2015-05-121-2/+2
| | | | | | | | | | | | | | | I added one test to check that divide can return a float, then hacked at the rippling failures across the entire entire codebase until all tests pass. Now I need to look at the changes I made and see if there's a system to them, identify other places that I missed, and figure out the best way to cover all cases. I also need to show real rather than encoded values in the traces, but I can't use value() inside reagent methods because of the name clash with the member variable. So let's take a snapshot before we attempt any refactoring. This was non-trivial to get right. Even if I convince myself that I've gotten it right, I might back this all out if I can't easily *persuade others* that I've gotten it right.
* 1343Kartik K. Agaram2015-05-111-1/+1
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* 1298 - better ingredient/product handlingKartik K. Agaram2015-05-071-2/+4
| | | | | | | | | | | | | | | | | | | All primitives now always write to all their products. If a product is not used that's fine, but if an instruction seems to expect too many products mu will complain. In the process, many primitives can operate on more than two ingredients where it seems intuitive. You can add or divide more than two numbers together, copy or negate multiple corresponding locations, etc. There's one remaining bit of ugliness. Some instructions like get/get-address, index/index-address, wait-for-location, these can unnecessarily load values from memory when they don't need to. Useful vim commands: %s/ingredients\[\([^\]]*\)\]/ingredients.at(\1)/gc %s/products\[\([^\]]*\)\]/products.at(\1)/gc .,$s/\[\(.\)]/.at(\1)/gc
* 1276 - make C++ version the defaultKartik K. Agaram2015-05-051-0/+50
I've tried to update the Readme, but there are at least a couple of issues.
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/* See LICENSE file for copyright and license details.
 *
 * dynamic window manager is designed like any other X client as well. It is
 * driven through handling X events. In contrast to other X clients, a window
 * manager selects for SubstructureRedirectMask on the root window, to receive
 * events about window (dis-)appearance.  Only one X connection at a time is
 * allowed to select for this event mask.
 *
 * Calls to fetch an X event from the event queue are blocking.  Due reading
 * status text from standard input, a select()-driven main loop has been
 * implemented which selects for reads on the X connection and STDIN_FILENO to
 * handle all data smoothly. The event handlers of dwm are organized in an
 * array which is accessed whenever a new event has been fetched. This allows
 * event dispatching in O(1) time.
 *
 * Each child of the root window is called a client, except windows which have
 * set the override_redirect flag.  Clients are organized in a global
 * doubly-linked client list, the focus history is remembered through a global
 * stack list. Each client contains an array of Bools of the same size as the
 * global tags array to indicate the tags of a client.  
 *
 * Keys and tagging rules are organized as arrays and defined in config.h.
 *
 * To understand everything else, start reading main().
 */
#include <errno.h>
#include <locale.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/select.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <regex.h>
#include <X11/cursorfont.h>
#include <X11/keysym.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/Xproto.h>
#include <X11/Xutil.h>
//#ifdef XINERAMA
#include <X11/extensions/Xinerama.h>
//#endif

/* macros */
#define BUTTONMASK		(ButtonPressMask | ButtonReleaseMask)
#define CLEANMASK(mask)		(mask & ~(numlockmask | LockMask))
#define LENGTH(x)		(sizeof x / sizeof x[0])
#define MAXTAGLEN		16
#define MOUSEMASK		(BUTTONMASK | PointerMotionMask)


/* enums */
enum { BarTop, BarBot, BarOff };			/* bar position */
enum { CurNormal, CurResize, CurMove, CurLast };	/* cursor */
enum { ColBorder, ColFG, ColBG, ColLast };		/* color */
enum { NetSupported, NetWMName, NetLast };		/* EWMH atoms */
enum { WMProtocols, WMDelete, WMName, WMState, WMLast };/* default atoms */

/* typedefs */
typedef struct Client Client;
struct Client {
	char name[256];
	int x, y, w, h;
	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
	int minax, maxax, minay, maxay;
	long flags;
	unsigned int border, oldborder;
	Bool isbanned, isfixed, isfloating, isurgent;
	Bool *tags;
	Client *next;
	Client *prev;
	Client *snext;
	Window win;
	int monitor;
};

typedef struct {
	int x, y, w, h;
	unsigned long norm[ColLast];
	unsigned long sel[ColLast];
	Drawable drawable;
	GC gc;
	struct {
		int ascent;
		int descent;
		int height;
		XFontSet set;
		XFontStruct *xfont;
	} font;
} DC; /* draw context */

typedef struct {
	unsigned long mod;
	KeySym keysym;
	void (*func)(const char *arg);
	const char *arg;
} Key;

typedef struct {
	const char *symbol;
	void (*arrange)(void);
} Layout;

typedef struct {
	const char *prop;
	const char *tags;
	Bool isfloating;
	int monitor;
} Rule;

typedef struct {
	regex_t *propregex;
	regex_t *tagregex;
} Regs;

typedef struct {
	int monitor;
	Window barwin;
	int sx, sy, sw, sh, wax, way, wah, waw;
	Bool *seltags;
	Bool *prevtags;
	Layout *layout;
	double mwfact;
} Monitor;

/* function declarations */
void applyrules(Client *c);
void arrange(void);
void attach(Client *c);
void attachstack(Client *c);
void ban(Client *c);
void buttonpress(XEvent *e);
void checkotherwm(void);
void cleanup(void);
void compileregs(void);
void configure(Client *c);
void configurenotify(XEvent *e);
void configurerequest(XEvent *e);
void destroynotify(XEvent *e);
void detach(Client *c);
void detachstack(Client *c);
void drawbar(void);
void drawsquare(Monitor *, Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
void drawtext(Monitor *, const char *text, unsigned long col[ColLast], Bool invert);
void *emallocz(unsigned int size);
void enternotify(XEvent *e);
void eprint(const char *errstr, ...);
void expose(XEvent *e);
void floating(void); /* default floating layout */
void focus(Client *c);
void focusin(XEvent *e);
void focusnext(const char *arg);
void focusprev(const char *arg);
Client *getclient(Window w);
unsigned long getcolor(const char *colstr);
long getstate(Window w);
Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
void grabbuttons(Client *c, Bool focused);
void grabkeys(void);
unsigned int idxoftag(const char *tag);
void initfont(const char *fontstr);
Bool isoccupied(unsigned int monitor, unsigned int t);
Bool isprotodel(Client *c);
Bool isurgent(unsigned int monitor, unsigned int t);
Bool isvisible(Client *c, int monitor);
void keypress(XEvent *e);
void killclient(const char *arg);
void manage(Window w, XWindowAttributes *wa);
void mappingnotify(XEvent *e);
void maprequest(XEvent *e);
void movemouse(Client *c);
Client *nexttiled(Client *c, int monitor);
void propertynotify(XEvent *e);
void quit(const char *arg);
void reapply(const char *arg);
void resize(Client *c, int x, int y, int w, int h, Bool sizehints);
void resizemouse(Client *c);
void restack(void);
void run(void);
void scan(void);
void setclientstate(Client *c, long state);
void setlayout(const char *arg);
void setmwfact(const char *arg);
void setup(void);
void spawn(const char *arg);
void tag(const char *arg);
unsigned int textnw(const char *text, unsigned int len);
unsigned int textw(const char *text);
void tile(void);
void togglebar(const char *arg);
void togglefloating(const char *arg);
void toggletag(const char *arg);
void toggleview(const char *arg);
void unban(Client *c);
void unmanage(Client *c);
void unmapnotify(XEvent *e);
void updatebarpos(Monitor *m);
void updatesizehints(Client *c);
void updatetitle(Client *c);
void updatewmhints(Client *c);
void view(const char *arg);
void viewprevtag(const char *arg);	/* views previous selected tags */
int xerror(Display *dpy, XErrorEvent *ee);
int xerrordummy(Display *dsply, XErrorEvent *ee);
int xerrorstart(Display *dsply, XErrorEvent *ee);
void zoom(const char *arg);
int monitorat(void);
void movetomonitor(const char *arg);
void selectmonitor(const char *arg);

/* variables */
char stext[256];
int mcount = 1;
int selmonitor = 0;
int screen;
int (*xerrorxlib)(Display *, XErrorEvent *);
unsigned int bh, bpos;
unsigned int blw = 0;
unsigned int numlockmask = 0;
void (*handler[LASTEvent]) (XEvent *) = {
	[ButtonPress] = buttonpress,
	[ConfigureRequest] = configurerequest,
	[ConfigureNotify] = configurenotify,
	[DestroyNotify] = destroynotify,
	[EnterNotify] = enternotify,
	[Expose] = expose,
	[FocusIn] = focusin,
	[KeyPress] = keypress,
	[MappingNotify] = mappingnotify,
	[MapRequest] = maprequest,
	[PropertyNotify] = propertynotify,
	[UnmapNotify] = unmapnotify
};
Atom wmatom[WMLast], netatom[NetLast];
Bool isxinerama = False;
Bool domwfact = True;
Bool dozoom = True;
Bool otherwm, readin;
Bool running = True;
Client *clients = NULL;
Client *sel = NULL;
Client *stack = NULL;
Cursor cursor[CurLast];
Display *dpy;
DC dc = {0};
Regs *regs = NULL;
Monitor *monitors;
Window root;

/* configuration, allows nested code to access above variables */
#include "config.h"

//Bool prevtags[LENGTH(tags)];

/* function implementations */
void
applyrules(Client *c) {
	static char buf[512];
	unsigned int i, j;
	regmatch_t tmp;
	Bool matched_tag = False;
	Bool matched_monitor = False;
	XClassHint ch = { 0 };

	/* rule matching */
	XGetClassHint(dpy, c->win, &ch);
	snprintf(buf, sizeof buf, "%s:%s:%s",
			ch.res_class ? ch.res_class : "",
			ch.res_name ? ch.res_name : "", c->name);
	for(i = 0; i < LENGTH(rules); i++)
		if(regs[i].propregex && !regexec(regs[i].propregex, buf, 1, &tmp, 0)) {
			if (rules[i].monitor >= 0 && rules[i].monitor < mcount) {
				matched_monitor = True;
				c->monitor = rules[i].monitor;
			}

			c->isfloating = rules[i].isfloating;
			for(j = 0; regs[i].tagregex && j < LENGTH(tags); j++) {
				if(!regexec(regs[i].tagregex, tags[j], 1, &tmp, 0)) {
					matched_tag = True;
					c->tags[j] = True;
				}
			}
		}
	if(ch.res_class)
		XFree(ch.res_class);
	if(ch.res_name)
		XFree(ch.res_name);
	if(!matched_tag)
		memcpy(c->tags, monitors[monitorat()].seltags, sizeof initags);
	if (!matched_monitor)
		c->monitor = monitorat();
}

void
arrange(void) {
	Client *c;

	for(c = clients; c; c = c->next)
		if(isvisible(c, c->monitor))
			unban(c);
		else
			ban(c);

	monitors[selmonitor].layout->arrange();
	focus(NULL);
	restack();
}

void
attach(Client *c) {
	if(clients)
		clients->prev = c;
	c->next = clients;
	clients = c;
}

void
attachstack(Client *c) {
	c->snext = stack;
	stack = c;
}

void
ban(Client *c) {
	if(c->isbanned)
		return;
	XMoveWindow(dpy, c->win, c->x + 3 * monitors[c->monitor].sw, c->y);
	c->isbanned = True;
}

void
buttonpress(XEvent *e) {
	unsigned int i, x;
	Client *c;
	XButtonPressedEvent *ev = &e->xbutton;

	Monitor *m = &monitors[monitorat()];

	if(ev->window == m->barwin) {
		x = 0;
		for(i = 0; i < LENGTH(tags); i++) {
			x += textw(tags[i]);
			if(ev->x < x) {
				if(ev->button == Button1) {
					if(ev->state & MODKEY)
						tag(tags[i]);
					else
						view(tags[i]);
				}
				else if(ev->button == Button3) {
					if(ev->state & MODKEY)
						toggletag(tags[i]);
					else
						toggleview(tags[i]);
				}
				return;
			}
		}
		if((ev->x < x + blw) && ev->button == Button1)
			setlayout(NULL);
	}
	else if((c = getclient(ev->window))) {
		focus(c);
		if(CLEANMASK(ev->state) != MODKEY)
			return;
		if(ev->button == Button1) {
			restack();
			movemouse(c);
		}
		else if(ev->button == Button2) {
			if((floating != m->layout->arrange) && c->isfloating)
				togglefloating(NULL);
			else
				zoom(NULL);
		}
		else if(ev->button == Button3 && !c->isfixed) {
			restack();
			resizemouse(c);
		}
	}
}

void
checkotherwm(void) {
	otherwm = False;
	XSetErrorHandler(xerrorstart);

	/* this causes an error if some other window manager is running */
	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
	XSync(dpy, False);
	if(otherwm)
		eprint("dwm: another window manager is already running\n");
	XSync(dpy, False);
	XSetErrorHandler(NULL);
	xerrorxlib = XSetErrorHandler(xerror);
	XSync(dpy, False);
}

void
cleanup(void) {
	unsigned int i;
	close(STDIN_FILENO);
	while(stack) {
		unban(stack);
		unmanage(stack);
	}
	if(dc.font.set)
		XFreeFontSet(dpy, dc.font.set);
	else
		XFreeFont(dpy, dc.font.xfont);

	XUngrabKey(dpy, AnyKey, AnyModifier, root);
	XFreePixmap(dpy, dc.drawable);
	XFreeGC(dpy, dc.gc);
	XFreeCursor(dpy, cursor[CurNormal]);
	XFreeCursor(dpy, cursor[CurResize]);
	XFreeCursor(dpy, cursor[CurMove]);
	for(i = 0; i < mcount; i++)
		XDestroyWindow(dpy, monitors[i].barwin);
	XSync(dpy, False);
	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
}

void
compileregs(void) {
	unsigned int i;
	regex_t *reg;

	if(regs)
		return;
	regs = emallocz(LENGTH(rules) * sizeof(Regs));
	for(i = 0; i < LENGTH(rules); i++) {
		if(rules[i].prop) {
			reg = emallocz(sizeof(regex_t));
			if(regcomp(reg, rules[i].prop, REG_EXTENDED))
				free(reg);
			else
				regs[i].propregex = reg;
		}
		if(rules[i].tags) {
			reg = emallocz(sizeof(regex_t));
			if(regcomp(reg, rules[i].tags, REG_EXTENDED))
				free(reg);
			else
				regs[i].tagregex = reg;
		}
	}
}

void
configure(Client *c) {
	XConfigureEvent ce;

	ce.type = ConfigureNotify;
	ce.display = dpy;
	ce.event = c->win;
	ce.window = c->win;
	ce.x = c->x;
	ce.y = c->y;
	ce.width = c->w;
	ce.height = c->h;
	ce.border_width = c->border;
	ce.above = None;
	ce.override_redirect = False;
	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
}

void
configurenotify(XEvent *e) {
	XConfigureEvent *ev = &e->xconfigure;
	Monitor *m = &monitors[selmonitor];

	if(ev->window == root && (ev->width != m->sw || ev->height != m->sh)) {
		/* TODO -- update Xinerama dimensions here */
		m->sw = ev->width;
		m->sh = ev->height;
		XFreePixmap(dpy, dc.drawable);
		dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(root, screen), bh, DefaultDepth(dpy, screen));
		XResizeWindow(dpy, m->barwin, m->sw, bh);
		updatebarpos(m);
		arrange();
	}
}

void
configurerequest(XEvent *e) {
	Client *c;
	XConfigureRequestEvent *ev = &e->xconfigurerequest;
	XWindowChanges wc;

	if((c = getclient(ev->window))) {
		Monitor *m = &monitors[c->monitor];
		if(ev->value_mask & CWBorderWidth)
			c->border = ev->border_width;
		if(c->isfixed || c->isfloating || (floating == m->layout->arrange)) {
			if(ev->value_mask & CWX)
				c->x = m->sx+ev->x;
			if(ev->value_mask & CWY)
				c->y = m->sy+ev->y;
			if(ev->value_mask & CWWidth)
				c->w = ev->width;
			if(ev->value_mask & CWHeight)
				c->h = ev->height;
			if((c->x - m->sx + c->w) > m->sw && c->isfloating)
				c->x = m->sx + (m->sw / 2 - c->w / 2); /* center in x direction */
			if((c->y - m->sy + c->h) > m->sh && c->isfloating)
				c->y = m->sy + (m->sh / 2 - c->h / 2); /* center in y direction */
			if((ev->value_mask & (CWX | CWY))
			&& !(ev->value_mask & (CWWidth | CWHeight)))
				configure(c);
			if(isvisible(c, monitorat()))
				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
		}
		else
			configure(c);
	}
	else {
		wc.x = ev->x;
		wc.y = ev->y;
		wc.width = ev->width;
		wc.height = ev->height;
		wc.border_width = ev->border_width;
		wc.sibling = ev->above;
		wc.stack_mode = ev->detail;
		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
	}
	XSync(dpy, False);
}

void
destroynotify(XEvent *e) {
	Client *c;
	XDestroyWindowEvent *ev = &e->xdestroywindow;

	if((c = getclient(ev->window)))
		unmanage(c);
}

void
detach(Client *c) {
	if(c->prev)
		c->prev->next = c->next;
	if(c->next)
		c->next->prev = c->prev;
	if(c == clients)
		clients = c->next;
	c->next = c->prev = NULL;
}

void
detachstack(Client *c) {
	Client **tc;

	for(tc=&stack; *tc && *tc != c; tc=&(*tc)->snext);
	*tc = c->snext;
}

void
drawbar(void) {
	int i, j, x;
	Client *c;

	for(i = 0; i < mcount; i++) {
		Monitor *m = &monitors[i];
		dc.x = 0;
		for(c = stack; c && !isvisible(c, i); c = c->snext);
		fprintf(stderr, "m%d %s\n", i, c ? c->name : "NIL");
		for(j = 0; j < LENGTH(tags); j++) {
			dc.w = textw(tags[j]);
			if(m->seltags[j]) {
				drawtext(m, tags[j], dc.sel, isurgent(i, j));
				drawsquare(m, c && c->tags[j] && c->monitor == i,
						isoccupied(i, j), isurgent(i, j), dc.sel);
			}
			else {
				drawtext(m, tags[j], dc.norm, isurgent(i, j));
				drawsquare(m, c && c->tags[j] && c->monitor == i,
						isoccupied(i, j), isurgent(i, j), dc.norm);
			}
			dc.x += dc.w;
		}
		dc.w = blw;
		drawtext(m, m->layout->symbol, dc.norm, False);
		x = dc.x + dc.w;
		if(i == selmonitor) {
			dc.w = textw(stext);
			dc.x = m->sw - dc.w;
			if(dc.x < x) {
				dc.x = x;
				dc.w = m->sw - x;
			}
			drawtext(m, stext, dc.norm, False);
		}
		else
			dc.x = m->sw;
		if((dc.w = dc.x - x) > bh) {
			dc.x = x;
			if(c) {
				drawtext(m, c->name, dc.sel, False);
				drawsquare(m, False, c->isfloating, False, dc.sel);
			}
			else
				drawtext(m, NULL, dc.norm, False);
		}
		XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->sw, bh, 0, 0);
		XSync(dpy, False);
	}
}

void
drawsquare(Monitor *m, Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
	int x;
	XGCValues gcv;
	XRectangle r = { dc.x, dc.y, dc.w, dc.h };

	gcv.foreground = col[invert ? ColBG : ColFG];
	XChangeGC(dpy, dc.gc, GCForeground, &gcv);
	x = (dc.font.ascent + dc.font.descent + 2) / 4;
	r.x = dc.x + 1;
	r.y = dc.y + 1;
	if(filled) {
		r.width = r.height = x + 1;
		XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
	}
	else if(empty) {
		r.width = r.height = x;
		XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
	}
}

void
drawtext(Monitor *m, const char *text, unsigned long col[ColLast], Bool invert) {
	int x, y, w, h;
	static char buf[256];
	unsigned int len, olen;
	XRectangle r = { dc.x, dc.y, dc.w, dc.h };

	XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
	XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
	if(!text)
		return;
	w = 0;
	olen = len = strlen(text);
	if(len >= sizeof buf)
		len = sizeof buf - 1;
	memcpy(buf, text, len);
	buf[len] = 0;
	h = dc.font.ascent + dc.font.descent;
	y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
	x = dc.x + (h / 2);
	/* shorten text if necessary */
	while(len && (w = textnw(buf, len)) > dc.w - h)
		buf[--len] = 0;
	if(len < olen) {
		if(len > 1)
			buf[len - 1] = '.';
		if(len > 2)
			buf[len - 2] = '.';
		if(len > 3)
			buf[len - 3] = '.';
	}
	if(w > dc.w)
		return; /* too long */
	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
	if(dc.font.set)
		XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
	else
		XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
}

void *
emallocz(unsigned int size) {
	void *res = calloc(1, size);

	if(!res)
		eprint("fatal: could not malloc() %u bytes\n", size);
	return res;
}

void
enternotify(XEvent *e) {
	Client *c;
	XCrossingEvent *ev = &e->xcrossing;

	if(ev->mode != NotifyNormal || ev->detail == NotifyInferior) {
		if(!isxinerama || ev->window != root)
			return;
	}
	if((c = getclient(ev->window)))
		focus(c);
	else {
		selmonitor = monitorat();
		fprintf(stderr, "updating selmonitor %d\n", selmonitor);
		focus(NULL);
	}
}

void
eprint(const char *errstr, ...) {
	va_list ap;

	va_start(ap, errstr);
	vfprintf(stderr, errstr, ap);
	va_end(ap);
	exit(EXIT_FAILURE);
}

void
expose(XEvent *e) {
	XExposeEvent *ev = &e->xexpose;

	if(ev->count == 0) {
		if(ev->window == monitors[selmonitor].barwin)
			drawbar();
	}
}

void
floating(void) { /* default floating layout */
	Client *c;

	domwfact = dozoom = False;
	for(c = clients; c; c = c->next)
		if(isvisible(c, selmonitor))
			resize(c, c->x, c->y, c->w, c->h, True);
}

void
focus(Client *c) {
	Monitor *m;

	if(c)
		selmonitor = c->monitor;
	m = &monitors[selmonitor];
	if(!c || (c && !isvisible(c, selmonitor)))
		for(c = stack; c && !isvisible(c, c->monitor); c = c->snext);
	if(sel && sel != c) {
		grabbuttons(sel, False);
		XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
	}
	if(c) {
		detachstack(c);
		attachstack(c);
		grabbuttons(c, True);
	}
	sel = c;
	drawbar();
	if(c) {
		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
		selmonitor = c->monitor;
	}
	else {
		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
		drawbar();
	}
}

void
focusin(XEvent *e) { /* there are some broken focus acquiring clients */
	XFocusChangeEvent *ev = &e->xfocus;

	if(sel && ev->window != sel->win)
		XSetInputFocus(dpy, sel->win, RevertToPointerRoot, CurrentTime);
}

void
focusnext(const char *arg) {
	Client *c;

	if(!sel)
		return;
	for(c = sel->next; c && !isvisible(c, selmonitor); c = c->next);
	if(!c)
		for(c = clients; c && !isvisible(c, selmonitor); c = c->next);
	if(c) {
		focus(c);
		restack();
	}
}

void
focusprev(const char *arg) {
	Client *c;

	if(!sel)
		return;
	for(c = sel->prev; c && !isvisible(c, selmonitor); c = c->prev);
	if(!c) {
		for(c = clients; c && c->next; c = c->next);
		for(; c && !isvisible(c, selmonitor); c = c->prev);
	}
	if(c) {
		focus(c);
		restack();
	}
}

Client *
getclient(Window w) {
	Client *c;

	for(c = clients; c && c->win != w; c = c->next);
	return c;
}

unsigned long
getcolor(const char *colstr) {
	Colormap cmap = DefaultColormap(dpy, screen);
	XColor color;

	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
		eprint("error, cannot allocate color '%s'\n", colstr);
	return color.pixel;
}

long
getstate(Window w) {
	int format, status;
	long result = -1;
	unsigned char *p = NULL;
	unsigned long n, extra;
	Atom real;

	status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
			&real, &format, &n, &extra, (unsigned char **)&p);
	if(status != Success)
		return -1;
	if(n != 0)
		result = *p;
	XFree(p);
	return result;
}

Bool
gettextprop(Window w, Atom atom, char *text, unsigned int size) {
	char **list = NULL;
	int n;
	XTextProperty name;

	if(!text || size == 0)
		return False;
	text[0] = '\0';
	XGetTextProperty(dpy, w, &name, atom);
	if(!name.nitems)
		return False;
	if(name.encoding == XA_STRING)
		strncpy(text, (char *)name.value, size - 1);
	else {
		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
		&& n > 0 && *list) {
			strncpy(text, *list, size - 1);
			XFreeStringList(list);
		}
	}
	text[size - 1] = '\0';
	XFree(name.value);
	return True;
}

void
grabbuttons(Client *c, Bool focused) {
	XUngrabButton(dpy, AnyButton, AnyModifier, c->win);

	if(focused) {
		XGrabButton(dpy, Button1, MODKEY, c->win, False, BUTTONMASK,
				GrabModeAsync, GrabModeSync, None, None);
		XGrabButton(dpy, Button1, MODKEY | LockMask, c->win, False, BUTTONMASK,
				GrabModeAsync, GrabModeSync, None, None);
		XGrabButton(dpy, Button1, MODKEY | numlockmask, c->win, False, BUTTONMASK,
				GrabModeAsync, GrabModeSync, None, None);
		XGrabButton(dpy, Button1, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
				GrabModeAsync, GrabModeSync, None, None);

		XGrabButton(dpy, Button2, MODKEY, c->win, False, BUTTONMASK,
				GrabModeAsync, GrabModeSync, None, None);
		XGrabButton(dpy, Button2, MODKEY | LockMask, c->win, False, BUTTONMASK,
				GrabModeAsync, GrabModeSync, None, None);
		XGrabButton(dpy, Button2, MODKEY | numlockmask, c->win, False, BUTTONMASK,
				GrabModeAsync, GrabModeSync, None, None);
		XGrabButton(dpy, Button2, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
				GrabModeAsync, GrabModeSync, None, None);

		XGrabButton(dpy, Button3, MODKEY, c->win, False, BUTTONMASK,
				GrabModeAsync, GrabModeSync, None, None);
		XGrabButton(dpy, Button3, MODKEY | LockMask, c->win, False, BUTTONMASK,
				GrabModeAsync, GrabModeSync, None, None);
		XGrabButton(dpy, Button3, MODKEY | numlockmask, c->win, False, BUTTONMASK,
				GrabModeAsync, GrabModeSync, None, None);
		XGrabButton(dpy, Button3, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
				GrabModeAsync, GrabModeSync, None, None);
	}
	else
		XGrabButton(dpy, AnyButton, AnyModifier, c->win, False, BUTTONMASK,
				GrabModeAsync, GrabModeSync, None, None);
}

void
grabkeys(void)  {
	unsigned int i, j;
	KeyCode code;
	XModifierKeymap *modmap;

	/* init modifier map */
	modmap = XGetModifierMapping(dpy);
	for(i = 0; i < 8; i++)
		for(j = 0; j < modmap->max_keypermod; j++) {
			if(modmap->modifiermap[i * modmap->max_keypermod + j] == XKeysymToKeycode(dpy, XK_Num_Lock))
				numlockmask = (1 << i);
		}
	XFreeModifiermap(modmap);

	XUngrabKey(dpy, AnyKey, AnyModifier, root);
	for(i = 0; i < LENGTH(keys); i++) {
		code = XKeysymToKeycode(dpy, keys[i].keysym);
		XGrabKey(dpy, code, keys[i].mod, root, True,
				GrabModeAsync, GrabModeAsync);
		XGrabKey(dpy, code, keys[i].mod | LockMask, root, True,
				GrabModeAsync, GrabModeAsync);
		XGrabKey(dpy, code, keys[i].mod | numlockmask, root, True,
				GrabModeAsync, GrabModeAsync);
		XGrabKey(dpy, code, keys[i].mod | numlockmask | LockMask, root, True,
				GrabModeAsync, GrabModeAsync);
	}
}

unsigned int
idxoftag(const char *tag) {
	unsigned int i;

	for(i = 0; (i < LENGTH(tags)) && (tags[i] != tag); i++);
	return (i < LENGTH(tags)) ? i : 0;
}

void
initfont(const char *fontstr) {
	char *def, **missing;
	int i, n;

	missing = NULL;
	if(dc.font.set)
		XFreeFontSet(dpy, dc.font.set);
	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
	if(missing) {
		while(n--)
			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
		XFreeStringList(missing);
	}
	if(dc.font.set) {
		XFontSetExtents *font_extents;
		XFontStruct **xfonts;
		char **font_names;
		dc.font.ascent = dc.font.descent = 0;
		font_extents = XExtentsOfFontSet(dc.font.set);
		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
		for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
			if(dc.font.ascent < (*xfonts)->ascent)
				dc.font.ascent = (*xfonts)->ascent;
			if(dc.font.descent < (*xfonts)->descent)
				dc.font.descent = (*xfonts)->descent;
			xfonts++;
		}
	}
	else {
		if(dc.font.xfont)
			XFreeFont(dpy, dc.font.xfont);
		dc.font.xfont = NULL;
		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
		&& !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
			eprint("error, cannot load font: '%s'\n", fontstr);
		dc.font.ascent = dc.font.xfont->ascent;
		dc.font.descent = dc.font.xfont->descent;
	}
	dc.font.height = dc.font.ascent + dc.font.descent;
}

Bool
isoccupied(unsigned int monitor, unsigned int t) {
	Client *c;

	for(c = clients; c; c = c->next)
		if(c->tags[t] && c->monitor == monitor)
			return True;
	return False;
}

Bool
isprotodel(Client *c) {
	int i, n;
	Atom *protocols;
	Bool ret = False;

	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
		for(i = 0; !ret && i < n; i++)
			if(protocols[i] == wmatom[WMDelete])
				ret = True;
		XFree(protocols);
	}
	return ret;
}

Bool
isurgent(unsigned int monitor, unsigned int t) {
	Client *c;

	for(c = clients; c; c = c->next)
		if(c->monitor == monitor && c->isurgent && c->tags[t])
			return True;
	return False;
}

Bool
isvisible(Client *c, int monitor) {
	unsigned int i;

	if(c->monitor != monitor)
		return False;
	for(i = 0; i < LENGTH(tags); i++)
		if(c->tags[i] && monitors[c->monitor].seltags[i])
			return True;
	return False;
}

void
keypress(XEvent *e) {
	unsigned int i;
	KeySym keysym;
	XKeyEvent *ev;

	ev = &e->xkey;
	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
	for(i = 0; i < LENGTH(keys); i++)
		if(keysym == keys[i].keysym
		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state))
		{
			if(keys[i].func)
				keys[i].func(keys[i].arg);
		}
}

void
killclient(const char *arg) {
	XEvent ev;

	if(!sel)
		return;
	if(isprotodel(sel)) {
		ev.type = ClientMessage;
		ev.xclient.window = sel->win;
		ev.xclient.message_type = wmatom[WMProtocols];
		ev.xclient.format = 32;
		ev.xclient.data.l[0] = wmatom[WMDelete];
		ev.xclient.data.l[1] = CurrentTime;
		XSendEvent(dpy, sel->win, False, NoEventMask, &ev);
	}
	else
		XKillClient(dpy, sel->win);
}

void
manage(Window w, XWindowAttributes *wa) {
	Client *c, *t = NULL;
	Monitor *m;
	Status rettrans;
	Window trans;
	XWindowChanges wc;

	c = emallocz(sizeof(Client));
	c->tags = emallocz(sizeof initags);
	c->win = w;

	applyrules(c);

	m = &monitors[c->monitor];

	c->x = wa->x + m->sx;
	c->y = wa->y + m->sy;
	c->w = wa->width;
	c->h = wa->height;
	c->oldborder = wa->border_width;

	if(c->w == m->sw && c->h == m->sh) {
		c->x = m->sx;
		c->y = m->sy;
		c->border = wa->border_width;
	}
	else {
		if(c->x + c->w + 2 * c->border > m->wax + m->waw)
			c->x = m->wax + m->waw - c->w - 2 * c->border;
		if(c->y + c->h + 2 * c->border > m->way + m->wah)
			c->y = m->way + m->wah - c->h - 2 * c->border;
		if(c->x < m->wax)
			c->x = m->wax;
		if(c->y < m->way)
			c->y = m->way;
		c->border = BORDERPX;
	}
	wc.border_width = c->border;
	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
	XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
	configure(c); /* propagates border_width, if size doesn't change */
	updatesizehints(c);
	XSelectInput(dpy, w, EnterWindowMask | FocusChangeMask | PropertyChangeMask | StructureNotifyMask);
	grabbuttons(c, False);
	updatetitle(c);
	if((rettrans = XGetTransientForHint(dpy, w, &trans) == Success))
		for(t = clients; t && t->win != trans; t = t->next);
	if(t)
		memcpy(c->tags, t->tags, sizeof initags);
	if(!c->isfloating)
		c->isfloating = (rettrans == Success) || c->isfixed;
	attach(c);
	attachstack(c);
	XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h); /* some windows require this */
	ban(c);
	XMapWindow(dpy, c->win);
	setclientstate(c, NormalState);
	arrange();
}

void
mappingnotify(XEvent *e) {
	XMappingEvent *ev = &e->xmapping;

	XRefreshKeyboardMapping(ev);
	if(ev->request == MappingKeyboard)
		grabkeys();
}

void
maprequest(XEvent *e) {
	static XWindowAttributes wa;
	XMapRequestEvent *ev = &e->xmaprequest;

	if(!XGetWindowAttributes(dpy, ev->window, &wa))
		return;
	if(wa.override_redirect)
		return;
	if(!getclient(ev->window))
		manage(ev->window, &wa);
}

int
monitorat() {
	int i, x, y;
	Window win;
	unsigned int mask;

	XQueryPointer(dpy, root, &win, &win, &x, &y, &i, &i, &mask);
	for(i = 0; i < mcount; i++) {
		if((x >= monitors[i].sx && x < monitors[i].sx + monitors[i].sw)
		&& (y >= monitors[i].sy && y < monitors[i].sy + monitors[i].sh)) {
			return i;
		}
	}
	return 0;
}

void
movemouse(Client *c) {
	int x1, y1, ocx, ocy, di, nx, ny;
	unsigned int dui;
	Window dummy;
	XEvent ev;

	ocx = nx = c->x;
	ocy = ny = c->y;
	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
			None, cursor[CurMove], CurrentTime) != GrabSuccess)
		return;
	XQueryPointer(dpy, root, &dummy, &dummy, &x1, &y1, &di, &di, &dui);
	for(;;) {
		XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask, &ev);
		switch (ev.type) {
		case ButtonRelease:
			XUngrabPointer(dpy, CurrentTime);
			return;
		case ConfigureRequest:
		case Expose:
		case MapRequest:
			handler[ev.type](&ev);
			break;
		case MotionNotify:
			XSync(dpy, False);
			nx = ocx + (ev.xmotion.x - x1);
			ny = ocy + (ev.xmotion.y - y1);
			Monitor *m = &monitors[monitorat()];
			if(abs(m->wax - nx) < SNAP)
				nx = m->wax;
			else if(abs((m->wax + m->waw) - (nx + c->w + 2 * c->border)) < SNAP)
				nx = m->wax + m->waw - c->w - 2 * c->border;
			if(abs(m->way - ny) < SNAP)
				ny = m->way;
			else if(abs((m->way + m->wah) - (ny + c->h + 2 * c->border)) < SNAP)
				ny = m->way + m->wah - c->h - 2 * c->border;
			if((monitors[selmonitor].layout->arrange != floating) && (abs(nx - c->x) > SNAP || abs(ny - c->y) > SNAP))
				togglefloating(NULL);
			if((monitors[selmonitor].layout->arrange == floating) || c->isfloating)
				resize(c, nx, ny, c->w, c->h, False);
			memcpy(c->tags, monitors[monitorat()].seltags, sizeof initags);
			break;
		}
	}
}

Client *
nexttiled(Client *c, int monitor) {
	for(; c && (c->isfloating || !isvisible(c, monitor)); c = c->next);
	return c;
}

void
propertynotify(XEvent *e) {
	Client *c;
	Window trans;
	XPropertyEvent *ev = &e->xproperty;

	if(ev->state == PropertyDelete)
		return; /* ignore */
	if((c = getclient(ev->window))) {
		switch (ev->atom) {
			default: break;
			case XA_WM_TRANSIENT_FOR:
				XGetTransientForHint(dpy, c->win, &trans);
				if(!c->isfloating && (c->isfloating = (getclient(trans) != NULL)))
					arrange();
				break;
			case XA_WM_NORMAL_HINTS:
				updatesizehints(c);
				break;
			case XA_WM_HINTS:
				updatewmhints(c);
				drawbar();
				break;
		}
		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
			updatetitle(c);
			if(c == sel)
				drawbar();
		}
	}
}

void
quit(const char *arg) {
	readin = running = False;
}

void
reapply(const char *arg) {
	static Bool zerotags[LENGTH(tags)] = { 0 };
	Client *c;

	for(c = clients; c; c = c->next) {
		memcpy(c->tags, zerotags, sizeof zerotags);
		applyrules(c);
	}
	arrange();
}

void
resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
	XWindowChanges wc;
	//Monitor scr = monitors[monitorat()];
//	c->monitor = monitorat();

	if(sizehints) {
		/* set minimum possible */
		if (w < 1)
			w = 1;
		if (h < 1)
			h = 1;

		/* temporarily remove base dimensions */
		w -= c->basew;
		h -= c->baseh;

		/* adjust for aspect limits */
		if (c->minay > 0 && c->maxay > 0 && c->minax > 0 && c->maxax > 0) {
			if (w * c->maxay > h * c->maxax)
				w = h * c->maxax / c->maxay;
			else if (w * c->minay < h * c->minax)
				h = w * c->minay / c->minax;
		}

		/* adjust for increment value */
		if(c->incw)
			w -= w % c->incw;
		if(c->inch)
			h -= h % c->inch;

		/* restore base dimensions */
		w += c->basew;
		h += c->baseh;

		if(c->minw > 0 && w < c->minw)
			w = c->minw;
		if(c->minh > 0 && h < c->minh)
			h = c->minh;
		if(c->maxw > 0 && w > c->maxw)
			w = c->maxw;
		if(c->maxh > 0 && h > c->maxh)
			h = c->maxh;
	}
	if(w <= 0 || h <= 0)
		return;
	/* TODO: offscreen appearance fixes */
	/*
	if(x > scr.sw)
		x = scr.sw - w - 2 * c->border;
	if(y > scr.sh)
		y = scr.sh - h - 2 * c->border;
	if(x + w + 2 * c->border < scr.sx)
		x = scr.sx;
	if(y + h + 2 * c->border < scr.sy)
		y = scr.sy;
	*/
	if(c->x != x || c->y != y || c->w != w || c->h != h) {
		c->x = wc.x = x;
		c->y = wc.y = y;
		c->w = wc.width = w;
		c->h = wc.height = h;
		wc.border_width = c->border;
		XConfigureWindow(dpy, c->win, CWX | CWY | CWWidth | CWHeight | CWBorderWidth, &wc);
		configure(c);
		XSync(dpy, False);
	}
}

void
resizemouse(Client *c) {
	int ocx, ocy;
	int nw, nh;
	XEvent ev;

	ocx = c->x;
	ocy = c->y;
	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
			None, cursor[CurResize], CurrentTime) != GrabSuccess)
		return;
	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->border - 1, c->h + c->border - 1);
	for(;;) {
		XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask , &ev);
		switch(ev.type) {
		case ButtonRelease:
			XWarpPointer(dpy, None, c->win, 0, 0, 0, 0,
					c->w + c->border - 1, c->h + c->border - 1);
			XUngrabPointer(dpy, CurrentTime);
			while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
			return;
		case ConfigureRequest:
		case Expose:
		case MapRequest:
			handler[ev.type](&ev);
			break;
		case MotionNotify:
			XSync(dpy, False);
			if((nw = ev.xmotion.x - ocx - 2 * c->border + 1) <= 0)
				nw = 1;
			if((nh = ev.xmotion.y - ocy - 2 * c->border + 1) <= 0)
				nh = 1;
			if((monitors[selmonitor].layout->arrange != floating) && (abs(nw - c->w) > SNAP || abs(nh - c->h) > SNAP))
				togglefloating(NULL);
			if((monitors[selmonitor].layout->arrange == floating) || c->isfloating)
				resize(c, c->x, c->y, nw, nh, True);
			break;
		}
	}
}

void
restack(void) {
	unsigned int i;
	Client *c;
	XEvent ev;
	XWindowChanges wc;

	drawbar();
	if(!sel)
		return;
	if(sel->isfloating || (monitors[selmonitor].layout->arrange == floating))
		XRaiseWindow(dpy, sel->win);
	if(monitors[selmonitor].layout->arrange != floating) {
		wc.stack_mode = Below;
		wc.sibling = monitors[selmonitor].barwin;
		if(!sel->isfloating) {
			XConfigureWindow(dpy, sel->win, CWSibling | CWStackMode, &wc);
			wc.sibling = sel->win;
		}
		for(i = 0; i < mcount; i++) {
			for(c = nexttiled(clients, i); c; c = nexttiled(c->next, i)) {
				if(c == sel)
					continue;
				XConfigureWindow(dpy, c->win, CWSibling | CWStackMode, &wc);
				wc.sibling = c->win;
			}
		}
	}
	XSync(dpy, False);
	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
}

void
run(void) {
	char *p;
	char buf[sizeof stext];
	fd_set rd;
	int r, xfd;
	unsigned int len, offset;
	XEvent ev;

	/* main event loop, also reads status text from stdin */
	XSync(dpy, False);
	xfd = ConnectionNumber(dpy);
	readin = True;
	offset = 0;
	len = sizeof stext - 1;
	buf[len] = stext[len] = '\0'; /* 0-terminator is never touched */
	while(running) {
		FD_ZERO(&rd);
		if(readin)
			FD_SET(STDIN_FILENO, &rd);
		FD_SET(xfd, &rd);
		if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
			if(errno == EINTR)
				continue;
			eprint("select failed\n");
		}
		if(FD_ISSET(STDIN_FILENO, &rd)) {
			switch((r = read(STDIN_FILENO, buf + offset, len - offset))) {
			case -1:
				strncpy(stext, strerror(errno), len);
				readin = False;
				break;
			case 0:
				strncpy(stext, "EOF", 4);
				readin = False;
				break;
			default:
				for(p = buf + offset; r > 0; p++, r--, offset++)
					if(*p == '\n' || *p == '\0') {
						*p = '\0';
						strncpy(stext, buf, len);
						p += r - 1; /* p is buf + offset + r - 1 */
						for(r = 0; *(p - r) && *(p - r) != '\n'; r++);
						offset = r;
						if(r)
							memmove(buf, p - r + 1, r);
						break;
					}
				break;
			}
			drawbar();
		}
		while(XPending(dpy)) {
			XNextEvent(dpy, &ev);
			if(handler[ev.type])
				(handler[ev.type])(&ev); /* call handler */
		}
	}
}

void
scan(void) {
	unsigned int i, num;
	Window *wins, d1, d2;
	XWindowAttributes wa;

	wins = NULL;
	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
		for(i = 0; i < num; i++) {
			if(!XGetWindowAttributes(dpy, wins[i], &wa)
					|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
				continue;
			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
				manage(wins[i], &wa);
		}
		for(i = 0; i < num; i++) { /* now the transients */
			if(!XGetWindowAttributes(dpy, wins[i], &wa))
				continue;
			if(XGetTransientForHint(dpy, wins[i], &d1)
					&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
				manage(wins[i], &wa);
		}
	}
	if(wins)
		XFree(wins);
}

void
setclientstate(Client *c, long state) {
	long data[] = {state, None};

	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
			PropModeReplace, (unsigned char *)data, 2);
}

void
setlayout(const char *arg) {
	unsigned int i;
	Monitor *m = &monitors[monitorat()];

	if(!arg) {
		m->layout++;
		if(m->layout == &layouts[LENGTH(layouts)])
			m->layout = &layouts[0];
	}
	else {
		for(i = 0; i < LENGTH(layouts); i++)
			if(!strcmp(arg, layouts[i].symbol))
				break;
		if(i == LENGTH(layouts))
			return;
		m->layout = &layouts[i];
	}
	if(sel)
		arrange();
	else
		drawbar();
}

void
setmwfact(const char *arg) {
	double delta;

	Monitor *m = &monitors[monitorat()];

	if(!domwfact)
		return;
	/* arg handling, manipulate mwfact */
	if(arg == NULL)
		m->mwfact = MWFACT;
	else if(sscanf(arg, "%lf", &delta) == 1) {
		if(arg[0] == '+' || arg[0] == '-')
			m->mwfact += delta;
		else
			m->mwfact = delta;
		if(m->mwfact < 0.1)
			m->mwfact = 0.1;
		else if(m->mwfact > 0.9)
			m->mwfact = 0.9;
	}
	arrange();
}

void
setup(void) {
	unsigned int i;
	Monitor *m;
	XSetWindowAttributes wa;
	XineramaScreenInfo *info = NULL;

	/* init atoms */
	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
	wmatom[WMName] = XInternAtom(dpy, "WM_NAME", False);
	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);

	/* init cursors */
	wa.cursor = cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);

	// init screens/monitors first
	mcount = 1;
	if((isxinerama = XineramaIsActive(dpy)))
		info = XineramaQueryScreens(dpy, &mcount);
	monitors = emallocz(mcount * sizeof(Monitor));

	screen = DefaultScreen(dpy);
	root = RootWindow(dpy, screen);

	/* init appearance */
	dc.norm[ColBorder] = getcolor(NORMBORDERCOLOR);
	dc.norm[ColBG] = getcolor(NORMBGCOLOR);
	dc.norm[ColFG] = getcolor(NORMFGCOLOR);
	dc.sel[ColBorder] = getcolor(SELBORDERCOLOR);
	dc.sel[ColBG] = getcolor(SELBGCOLOR);
	dc.sel[ColFG] = getcolor(SELFGCOLOR);
	initfont(FONT);
	dc.h = bh = dc.font.height + 2;
	dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
	dc.gc = XCreateGC(dpy, root, 0, 0);
	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
	if(!dc.font.set)
		XSetFont(dpy, dc.gc, dc.font.xfont->fid);

	for(blw = i = 0; i < LENGTH(layouts); i++) {
		i = textw(layouts[i].symbol);
		if(i > blw)
			blw = i;
	}
	for(i = 0; i < mcount; i++) {
		/* init geometry */
		m = &monitors[i];

		m->monitor = i;

		if (mcount != 1 && isxinerama) {
			m->sx = info[i].x_org;
			m->sy = info[i].y_org;
			m->sw = info[i].width;
			m->sh = info[i].height;
			fprintf(stderr, "monitor[%d]: %d,%d,%d,%d\n", i, m->sx, m->sy, m->sw, m->sh);
		}
		else {
			m->sx = 0;
			m->sy = 0;
			m->sw = DisplayWidth(dpy, screen);
			m->sh = DisplayHeight(dpy, screen);
		}

		m->seltags = emallocz(sizeof initags);
		m->prevtags = emallocz(sizeof initags);

		memcpy(m->seltags, initags, sizeof initags);
		memcpy(m->prevtags, initags, sizeof initags);

		/* init layouts */
		m->mwfact = MWFACT;
		m->layout = &layouts[0];

		// TODO: bpos per screen?
		bpos = BARPOS;
		wa.override_redirect = 1;
		wa.background_pixmap = ParentRelative;
		wa.event_mask = ButtonPressMask | ExposureMask;

		/* init bars */
		m->barwin = XCreateWindow(dpy, root, m->sx, m->sy, m->sw, bh, 0,
				DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
				CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
		XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
		updatebarpos(m);
		XMapRaised(dpy, m->barwin);
		strcpy(stext, "dwm-"VERSION);

		/* EWMH support per monitor */
		XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
				PropModeReplace, (unsigned char *) netatom, NetLast);

		/* select for events */
		wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
				| EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
		XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
		XSelectInput(dpy, root, wa.event_mask);
	}
	if(info)
		XFree(info);

	/* grab keys */
	grabkeys();

	/* init tags */
	compileregs();

	selmonitor = monitorat();
	fprintf(stderr, "selmonitor == %d\n", selmonitor);
}

void
spawn(const char *arg) {
	static char *shell = NULL;

	if(!shell && !(shell = getenv("SHELL")))
		shell = "/bin/sh";
	if(!arg)
		return;
	/* The double-fork construct avoids zombie processes and keeps the code
	 * clean from stupid signal handlers. */
	if(fork() == 0) {
		if(fork() == 0) {
			if(dpy)
				close(ConnectionNumber(dpy));
			setsid();
			execl(shell, shell, "-c", arg, (char *)NULL);
			fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg);
			perror(" failed");
		}
		exit(0);
	}
	wait(0);
}

void
tag(const char *arg) {
	unsigned int i;

	if(!sel)
		return;
	for(i = 0; i < LENGTH(tags); i++)
		sel->tags[i] = (NULL == arg);
	sel->tags[idxoftag(arg)] = True;
	arrange();
}

unsigned int
textnw(const char *text, unsigned int len) {
	XRectangle r;

	if(dc.font.set) {
		XmbTextExtents(dc.font.set, text, len, NULL, &r);
		return r.width;
	}
	return XTextWidth(dc.font.xfont, text, len);
}

unsigned int
textw(const char *text) {
	return textnw(text, strlen(text)) + dc.font.height;
}

void
tile(void) {
	unsigned int i, j, n, nx, ny, nw, nh, mw, th;
	Client *c, *mc;

	domwfact = dozoom = True;

	nx = ny = nw = 0; /* gcc stupidity requires this */

	for (i = 0; i < mcount; i++) {
		Monitor *m = &monitors[i];

		for(n = 0, c = nexttiled(clients, i); c; c = nexttiled(c->next, i))
			n++;

		/* window geoms */
		mw = (n == 1) ? m->waw : m->mwfact * m->waw;
		th = (n > 1) ? m->wah / (n - 1) : 0;
		if(n > 1 && th < bh)
			th = m->wah;

		for(j = 0, c = mc = nexttiled(clients, i); c; c = nexttiled(c->next, i)) {
			if(j == 0) { /* master */
				nx = m->wax;
				ny = m->way;
				nw = mw - 2 * c->border;
				nh = m->wah - 2 * c->border;
			}
			else {  /* tile window */
				if(j == 1) {
					ny = m->way;
					nx += mc->w + 2 * mc->border;
					nw = m->waw - mw - 2 * c->border;
				}
				if(j + 1 == n) /* remainder */
					nh = (m->way + m->wah) - ny - 2 * c->border;
				else
					nh = th - 2 * c->border;
			}
			fprintf(stderr, "tile(%d, %d, %d, %d)\n", nx, ny, nw, nh);
			resize(c, nx, ny, nw, nh, RESIZEHINTS);
			if((RESIZEHINTS) && ((c->h < bh) || (c->h > nh) || (c->w < bh) || (c->w > nw)))
				/* client doesn't accept size constraints */
				resize(c, nx, ny, nw, nh, False);
			if(n > 1 && th != m->wah)
				ny = c->y + c->h + 2 * c->border;

			j++;
		}
	}
	fprintf(stderr, "done\n");
}
void
togglebar(const char *arg) {
	if(bpos == BarOff)
		bpos = (BARPOS == BarOff) ? BarTop : BARPOS;
	else
		bpos = BarOff;
	updatebarpos(&monitors[monitorat()]);
	arrange();
}

void
togglefloating(const char *arg) {
	if(!sel)
		return;
	sel->isfloating = !sel->isfloating;
	if(sel->isfloating)
		resize(sel, sel->x, sel->y, sel->w, sel->h, True);
	arrange();
}

void
toggletag(const char *arg) {
	unsigned int i, j;

	if(!sel)
		return;
	i = idxoftag(arg);
	sel->tags[i] = !sel->tags[i];
	for(j = 0; j < LENGTH(tags) && !sel->tags[j]; j++);
	if(j == LENGTH(tags))
		sel->tags[i] = True; /* at least one tag must be enabled */
	arrange();
}

void
toggleview(const char *arg) {
	unsigned int i, j;

	Monitor *m = &monitors[monitorat()];

	i = idxoftag(arg);
	m->seltags[i] = !m->seltags[i];
	for(j = 0; j < LENGTH(tags) && !m->seltags[j]; j++);
	if(j == LENGTH(tags))
		m->seltags[i] = True; /* at least one tag must be viewed */
	arrange();
}

void
unban(Client *c) {
	if(!c->isbanned)
		return;
	XMoveWindow(dpy, c->win, c->x, c->y);
	c->isbanned = False;
}

void
unmanage(Client *c) {
	XWindowChanges wc;

	wc.border_width = c->oldborder;
	/* The server grab construct avoids race conditions. */
	XGrabServer(dpy);
	XSetErrorHandler(xerrordummy);
	XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
	detach(c);
	detachstack(c);
	if(sel == c)
		focus(NULL);
	XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
	setclientstate(c, WithdrawnState);
	free(c->tags);
	free(c);
	XSync(dpy, False);
	XSetErrorHandler(xerror);
	XUngrabServer(dpy);
	arrange();
}

void
unmapnotify(XEvent *e) {
	Client *c;
	XUnmapEvent *ev = &e->xunmap;

	if((c = getclient(ev->window)))
		unmanage(c);
}

void
updatebarpos(Monitor *m) {
	XEvent ev;

	m->wax = m->sx;
	m->way = m->sy;
	m->wah = m->sh;
	m->waw = m->sw;
	switch(bpos) {
	default:
		m->wah -= bh;
		m->way += bh;
		XMoveWindow(dpy, m->barwin, m->sx, m->sy);
		break;
	case BarBot:
		m->wah -= bh;
		XMoveWindow(dpy, m->barwin, m->sx, m->sy + m->wah);
		break;
	case BarOff:
		XMoveWindow(dpy, m->barwin, m->sx, m->sy - bh);
		break;
	}
	XSync(dpy, False);
	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
}

void
updatesizehints(Client *c) {
	long msize;
	XSizeHints size;

	if(!XGetWMNormalHints(dpy, c->win, &size, &msize) || !size.flags)
		size.flags = PSize;
	c->flags = size.flags;
	if(c->flags & PBaseSize) {
		c->basew = size.base_width;
		c->baseh = size.base_height;
	}
	else if(c->flags & PMinSize) {
		c->basew = size.min_width;
		c->baseh = size.min_height;
	}
	else
		c->basew = c->baseh = 0;
	if(c->flags & PResizeInc) {
		c->incw = size.width_inc;
		c->inch = size.height_inc;
	}
	else
		c->incw = c->inch = 0;
	if(c->flags & PMaxSize) {
		c->maxw = size.max_width;
		c->maxh = size.max_height;
	}
	else
		c->maxw = c->maxh = 0;
	if(c->flags & PMinSize) {
		c->minw = size.min_width;
		c->minh = size.min_height;
	}
	else if(c->flags & PBaseSize) {
		c->minw = size.base_width;
		c->minh = size.base_height;
	}
	else
		c->minw = c->minh = 0;
	if(c->flags & PAspect) {
		c->minax = size.min_aspect.x;
		c->maxax = size.max_aspect.x;
		c->minay = size.min_aspect.y;
		c->maxay = size.max_aspect.y;
	}
	else
		c->minax = c->maxax = c->minay = c->maxay = 0;
	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
			&& c->maxw == c->minw && c->maxh == c->minh);
}

void
updatetitle(Client *c) {
	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
		gettextprop(c->win, wmatom[WMName], c->name, sizeof c->name);
}

void
updatewmhints(Client *c) {
	XWMHints *wmh;

	if((wmh = XGetWMHints(dpy, c->win))) {
		c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
		XFree(wmh);
	}
}

/* There's no way to check accesses to destroyed windows, thus those cases are
 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 * default error handler, which may call exit.  */
int
xerror(Display *dpy, XErrorEvent *ee) {
	if(ee->error_code == BadWindow
	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
		return 0;
	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
		ee->request_code, ee->error_code);
	return xerrorxlib(dpy, ee); /* may call exit */
}

int
xerrordummy(Display *dsply, XErrorEvent *ee) {
	return 0;
}

/* Startup Error handler to check if another window manager
 * is already running. */
int
xerrorstart(Display *dsply, XErrorEvent *ee) {
	otherwm = True;
	return -1;
}

void
view(const char *arg) {
	unsigned int i;
	Bool tmp[LENGTH(tags)];
	Monitor *m = &monitors[monitorat()];

	for(i = 0; i < LENGTH(tags); i++)
		tmp[i] = (NULL == arg);
	tmp[idxoftag(arg)] = True;
	if(memcmp(m->seltags, tmp, sizeof initags) != 0) {
		memcpy(m->prevtags, m->seltags, sizeof initags);
		memcpy(m->seltags, tmp, sizeof initags);
		arrange();
	}
}

void
viewprevtag(const char *arg) {
	static Bool tmp[LENGTH(tags)];

	Monitor *m = &monitors[monitorat()];

	memcpy(tmp, m->seltags, sizeof initags);
	memcpy(m->seltags, m->prevtags, sizeof initags);
	memcpy(m->prevtags, tmp, sizeof initags);
	arrange();
}

void
zoom(const char *arg) {
	Client *c;

	if(!sel || !dozoom || sel->isfloating)
		return;
	if((c = sel) == nexttiled(clients, c->monitor))
		if(!(c = nexttiled(c->next, c->monitor)))
			return;
	detach(c);
	attach(c);
	focus(c);
	arrange();
}

void
movetomonitor(const char *arg) {
	if (sel) {
		sel->monitor = arg ? atoi(arg) : (sel->monitor+1) % mcount;

		memcpy(sel->tags, monitors[sel->monitor].seltags, sizeof initags);
		resize(sel, monitors[sel->monitor].wax, monitors[sel->monitor].way, sel->w, sel->h, True);
		arrange();
	}
}

void
selectmonitor(const char *arg) {
	Monitor *m = &monitors[arg ? atoi(arg) : (monitorat()+1) % mcount];

	XWarpPointer(dpy, None, root, 0, 0, 0, 0, m->wax+m->waw/2, m->way+m->wah/2);
	focus(NULL);
}


int
main(int argc, char *argv[]) {
	if(argc == 2 && !strcmp("-v", argv[1]))
		eprint("dwm-"VERSION", © 2006-2007 Anselm R. Garbe, Sander van Dijk, "
		       "Jukka Salmi, Premysl Hruby, Szabolcs Nagy, Christof Musik\n");
	else if(argc != 1)
		eprint("usage: dwm [-v]\n");

	setlocale(LC_CTYPE, "");
	if(!(dpy = XOpenDisplay(0)))
		eprint("dwm: cannot open display\n");

	checkotherwm();
	setup();
	drawbar();
	scan();
	run();
	cleanup();

	XCloseDisplay(dpy);
	return 0;
}