JasonWoof Got questions, comments, patches, etc.? Contact Jason Woofenden
made the string-based setgeom working
[dwm.git] / dwm.c
1 /* See LICENSE file for copyright and license details.
2  *
3  * dynamic window manager is designed like any other X client as well. It is
4  * driven through handling X events. In contrast to other X clients, a window
5  * manager selects for SubstructureRedirectMask on the root window, to receive
6  * events about window (dis-)appearance.  Only one X connection at a time is
7  * allowed to select for this event mask.
8  *
9  * Calls to fetch an X event from the event queue are blocking.  Due reading
10  * status text from standard input, a select()-driven main loop has been
11  * implemented which selects for reads on the X connection and STDIN_FILENO to
12  * handle all data smoothly. The event handlers of dwm are organized in an
13  * array which is accessed whenever a new event has been fetched. This allows
14  * event dispatching in O(1) time.
15  *
16  * Each child of the root window is called a client, except windows which have
17  * set the override_redirect flag.  Clients are organized in a global
18  * doubly-linked client list, the focus history is remembered through a global
19  * stack list. Each client contains an array of Bools of the same size as the
20  * global tags array to indicate the tags of a client.
21  *
22  * Keys and tagging rules are organized as arrays and defined in config.h.
23  *
24  * To understand everything else, start reading main().
25  */
26 #include <errno.h>
27 #include <locale.h>
28 #include <stdarg.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <unistd.h>
33 #include <sys/select.h>
34 #include <sys/types.h>
35 #include <sys/wait.h>
36 #include <X11/cursorfont.h>
37 #include <X11/keysym.h>
38 #include <X11/Xatom.h>
39 #include <X11/Xlib.h>
40 #include <X11/Xproto.h>
41 #include <X11/Xutil.h>
42
43 /* macros */
44 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
45 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask))
46 #define LENGTH(x)               (sizeof x / sizeof x[0])
47 #define MAXTAGLEN               16
48 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
49
50 /* enums */
51 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
52 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
53 enum { NetSupported, NetWMName, NetLast };              /* EWMH atoms */
54 enum { WMProtocols, WMDelete, WMName, WMState, WMLast };/* default atoms */
55
56 /* typedefs */
57 typedef struct Client Client;
58 struct Client {
59         char name[256];
60         int x, y, w, h;
61         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
62         int minax, maxax, minay, maxay;
63         long flags;
64         unsigned int border, oldborder;
65         Bool isbanned, isfixed, isfloating, isurgent;
66         Bool *tags;
67         Client *next;
68         Client *prev;
69         Client *snext;
70         Window win;
71 };
72
73 typedef struct {
74         int x, y, w, h;
75         unsigned long norm[ColLast];
76         unsigned long sel[ColLast];
77         Drawable drawable;
78         GC gc;
79         struct {
80                 int ascent;
81                 int descent;
82                 int height;
83                 XFontSet set;
84                 XFontStruct *xfont;
85         } font;
86 } DC; /* draw context */
87
88 typedef struct {
89         unsigned long mod;
90         KeySym keysym;
91         void (*func)(const char *arg);
92         const char *arg;
93 } Key;
94
95 typedef struct {
96         const char *symbol;
97         void (*arrange)(void);
98         Bool isfloating;
99 } Layout; 
100
101 typedef struct {
102         const char *class;
103         const char *instance;
104         const char *title;
105         const char *tag;
106         Bool isfloating;
107 } Rule;
108
109 /* function declarations */
110 void applygeom(const char *arg);
111 void applyrules(Client *c);
112 void arrange(void);
113 void attach(Client *c);
114 void attachstack(Client *c);
115 void ban(Client *c);
116 void buttonpress(XEvent *e);
117 void checkotherwm(void);
118 void cleanup(void);
119 void configure(Client *c);
120 void configurenotify(XEvent *e);
121 void configurerequest(XEvent *e);
122 unsigned int counttiled(void);
123 void destroynotify(XEvent *e);
124 void detach(Client *c);
125 void detachstack(Client *c);
126 void drawbar(void);
127 void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
128 void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
129 void *emallocz(unsigned int size);
130 void enternotify(XEvent *e);
131 void eprint(const char *errstr, ...);
132 void expose(XEvent *e);
133 void floating(void); /* default floating layout */
134 void focus(Client *c);
135 void focusin(XEvent *e);
136 void focusnext(const char *arg);
137 void focusprev(const char *arg);
138 Client *getclient(Window w);
139 unsigned long getcolor(const char *colstr);
140 double getdouble(const char *s);
141 long getstate(Window w);
142 Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
143 void grabbuttons(Client *c, Bool focused);
144 void grabkeys(void);
145 unsigned int idxoftag(const char *t);
146 void initfont(const char *fontstr);
147 Bool isoccupied(unsigned int t);
148 Bool isprotodel(Client *c);
149 Bool isurgent(unsigned int t);
150 Bool isvisible(Client *c);
151 void keypress(XEvent *e);
152 void killclient(const char *arg);
153 void manage(Window w, XWindowAttributes *wa);
154 void mappingnotify(XEvent *e);
155 void maprequest(XEvent *e);
156 void monocle(void);
157 void movemouse(Client *c);
158 Client *nexttiled(Client *c);
159 void propertynotify(XEvent *e);
160 void quit(const char *arg);
161 void reapply(const char *arg);
162 void resize(Client *c, int x, int y, int w, int h, Bool sizehints);
163 void resizemouse(Client *c);
164 void restack(void);
165 void run(void);
166 void scan(void);
167 void setclientstate(Client *c, long state);
168 void setgeom(const char *arg);
169 void setlayout(const char *arg);
170 void setup(void);
171 void spawn(const char *arg);
172 void tag(const char *arg);
173 unsigned int textnw(const char *text, unsigned int len);
174 unsigned int textw(const char *text);
175 void tileh(void);
176 void tilehstack(unsigned int n);
177 Client *tilemaster(unsigned int n);
178 void tileresize(Client *c, int x, int y, int w, int h);
179 void tilev(void);
180 void tilevstack(unsigned int n);
181 void togglefloating(const char *arg);
182 void toggletag(const char *arg);
183 void toggleview(const char *arg);
184 void unban(Client *c);
185 void unmanage(Client *c);
186 void unmapnotify(XEvent *e);
187 void updatebarpos(void);
188 void updatesizehints(Client *c);
189 void updatetitle(Client *c);
190 void updatewmhints(Client *c);
191 void view(const char *arg);
192 void viewprevtag(const char *arg);      /* views previous selected tags */
193 int xerror(Display *dpy, XErrorEvent *ee);
194 int xerrordummy(Display *dpy, XErrorEvent *ee);
195 int xerrorstart(Display *dpy, XErrorEvent *ee);
196 void zoom(const char *arg);
197
198 /* variables */
199 char stext[256], buf[256];
200 int screen, sx, sy, sw, sh;
201 int (*xerrorxlib)(Display *, XErrorEvent *);
202 int bx, by, bw, bh, blw, mx, my, mw, mh, mox, moy, mow, moh, tx, ty, tw, th, wx, wy, ww, wh;
203 unsigned int numlockmask = 0;
204 void (*handler[LASTEvent]) (XEvent *) = {
205         [ButtonPress] = buttonpress,
206         [ConfigureRequest] = configurerequest,
207         [ConfigureNotify] = configurenotify,
208         [DestroyNotify] = destroynotify,
209         [EnterNotify] = enternotify,
210         [Expose] = expose,
211         [FocusIn] = focusin,
212         [KeyPress] = keypress,
213         [MappingNotify] = mappingnotify,
214         [MapRequest] = maprequest,
215         [PropertyNotify] = propertynotify,
216         [UnmapNotify] = unmapnotify
217 };
218 Atom wmatom[WMLast], netatom[NetLast];
219 Bool otherwm, readin;
220 Bool running = True;
221 Bool *prevtags;
222 Bool *seltags;
223 Client *clients = NULL;
224 Client *sel = NULL;
225 Client *stack = NULL;
226 Cursor cursor[CurLast];
227 Display *dpy;
228 DC dc = {0};
229 Layout *lt = NULL;
230 Window root, barwin;
231
232 /* configuration, allows nested code to access above variables */
233 #include "config.h"
234 #define TAGSZ (LENGTH(tags) * sizeof(Bool))
235 static Bool tmp[LENGTH(tags)];
236
237 /* function implementations */
238
239 void
240 applygeometry(const char *arg) {
241         static const char *lastArg = NULL;
242         char delim, op, *s, *e, *p;
243         double val;
244         int i, *map[] = { &bx,  &by,  &bw,  &bh,
245                           &wx,  &wy,  &ww,  &wh,
246                           &mx,  &my,  &mw,  &mh,
247                           &tx,  &ty,  &tw,  &th,
248                           &mox, &moy, &mow, &moh };
249
250         if(!arg)
251                 arg = lastArg;
252         else
253                 lastArg = arg;
254         if(!lastArg)
255                 return;
256         strncpy(buf, arg, sizeof buf);
257         for(i = 0, e = s = buf; i < LENGTH(map) && e; e++)
258                 if(*e == ' ' || *e == 0) {
259                         delim = *e;
260                         *e = 0;
261                         op = 0;
262                         /* check if there is an operator */
263                         for(p = s; p < e && *p != '-' && *p != '+' && *p != '*'; p++);
264                         if(*p) {
265                                 op = *p;
266                                 *p = 0;
267                         }
268                         val = getdouble(s);
269                         if(op && p > s) { /* intermediate operand, e.g. H-B */
270                                 *(map[i]) = (int)val;
271                                 s = ++p;
272                                 val = getdouble(s);
273                         }
274                         switch(op) {
275                         default:  *(map[i])  = (int)val; break;
276                         case '-': *(map[i]) -= (int)val; break;
277                         case '+': *(map[i]) += (int)val; break;
278                         case '*': *(map[i])  = (int)(((double)*(map[i])) * val); break;
279                         }
280                         if(delim == 0)
281                                 e = NULL;
282                         else
283                                 s = ++e;
284                         i++;
285                 }
286 }
287
288 void
289 applyrules(Client *c) {
290         unsigned int i;
291         Bool matched = False;
292         Rule *r;
293         XClassHint ch = { 0 };
294
295         /* rule matching */
296         XGetClassHint(dpy, c->win, &ch);
297         for(i = 0; i < LENGTH(rules); i++) {
298                 r = &rules[i];
299                 if(strstr(c->name, r->title)
300                 || (ch.res_class && r->class && strstr(ch.res_class, r->class))
301                 || (ch.res_name && r->instance && strstr(ch.res_name, r->instance)))
302                 {
303                         c->isfloating = r->isfloating;
304                         if(r->tag) {
305                                 c->tags[idxoftag(r->tag)] = True;
306                                 matched = True;
307                         }
308                 }
309         }
310         if(ch.res_class)
311                 XFree(ch.res_class);
312         if(ch.res_name)
313                 XFree(ch.res_name);
314         if(!matched)
315                 memcpy(c->tags, seltags, TAGSZ);
316 }
317
318 void
319 arrange(void) {
320         Client *c;
321
322         for(c = clients; c; c = c->next)
323                 if(isvisible(c))
324                         unban(c);
325                 else
326                         ban(c);
327
328         focus(NULL);
329         lt->arrange();
330         restack();
331 }
332
333 void
334 attach(Client *c) {
335         if(clients)
336                 clients->prev = c;
337         c->next = clients;
338         clients = c;
339 }
340
341 void
342 attachstack(Client *c) {
343         c->snext = stack;
344         stack = c;
345 }
346
347 void
348 ban(Client *c) {
349         if(c->isbanned)
350                 return;
351         XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
352         c->isbanned = True;
353 }
354
355 void
356 buttonpress(XEvent *e) {
357         unsigned int i, x;
358         Client *c;
359         XButtonPressedEvent *ev = &e->xbutton;
360
361         if(ev->window == barwin) {
362                 x = 0;
363                 for(i = 0; i < LENGTH(tags); i++) {
364                         x += textw(tags[i]);
365                         if(ev->x < x) {
366                                 if(ev->button == Button1) {
367                                         if(ev->state & MODKEY)
368                                                 tag(tags[i]);
369                                         else
370                                                 view(tags[i]);
371                                 }
372                                 else if(ev->button == Button3) {
373                                         if(ev->state & MODKEY)
374                                                 toggletag(tags[i]);
375                                         else
376                                                 toggleview(tags[i]);
377                                 }
378                                 return;
379                         }
380                 }
381         }
382         else if((c = getclient(ev->window))) {
383                 focus(c);
384                 if(CLEANMASK(ev->state) != MODKEY)
385                         return;
386                 if(ev->button == Button1) {
387                         restack();
388                         movemouse(c);
389                 }
390                 else if(ev->button == Button2) {
391                         if((floating != lt->arrange) && c->isfloating)
392                                 togglefloating(NULL);
393                         else
394                                 zoom(NULL);
395                 }
396                 else if(ev->button == Button3 && !c->isfixed) {
397                         restack();
398                         resizemouse(c);
399                 }
400         }
401 }
402
403 void
404 checkotherwm(void) {
405         otherwm = False;
406         XSetErrorHandler(xerrorstart);
407
408         /* this causes an error if some other window manager is running */
409         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
410         XSync(dpy, False);
411         if(otherwm)
412                 eprint("dwm: another window manager is already running\n");
413         XSync(dpy, False);
414         XSetErrorHandler(NULL);
415         xerrorxlib = XSetErrorHandler(xerror);
416         XSync(dpy, False);
417 }
418
419 void
420 cleanup(void) {
421         close(STDIN_FILENO);
422         while(stack) {
423                 unban(stack);
424                 unmanage(stack);
425         }
426         if(dc.font.set)
427                 XFreeFontSet(dpy, dc.font.set);
428         else
429                 XFreeFont(dpy, dc.font.xfont);
430         XUngrabKey(dpy, AnyKey, AnyModifier, root);
431         XFreePixmap(dpy, dc.drawable);
432         XFreeGC(dpy, dc.gc);
433         XFreeCursor(dpy, cursor[CurNormal]);
434         XFreeCursor(dpy, cursor[CurResize]);
435         XFreeCursor(dpy, cursor[CurMove]);
436         XDestroyWindow(dpy, barwin);
437         XSync(dpy, False);
438         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
439 }
440
441 void
442 configure(Client *c) {
443         XConfigureEvent ce;
444
445         ce.type = ConfigureNotify;
446         ce.display = dpy;
447         ce.event = c->win;
448         ce.window = c->win;
449         ce.x = c->x;
450         ce.y = c->y;
451         ce.width = c->w;
452         ce.height = c->h;
453         ce.border_width = c->border;
454         ce.above = None;
455         ce.override_redirect = False;
456         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
457 }
458
459 void
460 configurenotify(XEvent *e) {
461         XConfigureEvent *ev = &e->xconfigure;
462
463         if(ev->window == root && (ev->width != sw || ev->height != sh))
464                 setgeom(NULL);
465 }
466
467 void
468 configurerequest(XEvent *e) {
469         Client *c;
470         XConfigureRequestEvent *ev = &e->xconfigurerequest;
471         XWindowChanges wc;
472
473         if((c = getclient(ev->window))) {
474                 if(ev->value_mask & CWBorderWidth)
475                         c->border = ev->border_width;
476                 if(c->isfixed || c->isfloating || lt->isfloating) {
477                         if(ev->value_mask & CWX)
478                                 c->x = sx + ev->x;
479                         if(ev->value_mask & CWY)
480                                 c->y = sy + ev->y;
481                         if(ev->value_mask & CWWidth)
482                                 c->w = ev->width;
483                         if(ev->value_mask & CWHeight)
484                                 c->h = ev->height;
485                         if((c->x - sx + c->w) > sw && c->isfloating)
486                                 c->x = sx + (sw / 2 - c->w / 2); /* center in x direction */
487                         if((c->y - sy + c->h) > sh && c->isfloating)
488                                 c->y = sy + (sh / 2 - c->h / 2); /* center in y direction */
489                         if((ev->value_mask & (CWX|CWY))
490                         && !(ev->value_mask & (CWWidth|CWHeight)))
491                                 configure(c);
492                         if(isvisible(c))
493                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
494                 }
495                 else
496                         configure(c);
497         }
498         else {
499                 wc.x = ev->x;
500                 wc.y = ev->y;
501                 wc.width = ev->width;
502                 wc.height = ev->height;
503                 wc.border_width = ev->border_width;
504                 wc.sibling = ev->above;
505                 wc.stack_mode = ev->detail;
506                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
507         }
508         XSync(dpy, False);
509 }
510
511 unsigned int
512 counttiled(void) {
513         unsigned int n;
514         Client *c;
515
516         for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next), n++);
517         return n;
518 }
519
520 void
521 destroynotify(XEvent *e) {
522         Client *c;
523         XDestroyWindowEvent *ev = &e->xdestroywindow;
524
525         if((c = getclient(ev->window)))
526                 unmanage(c);
527 }
528
529 void
530 detach(Client *c) {
531         if(c->prev)
532                 c->prev->next = c->next;
533         if(c->next)
534                 c->next->prev = c->prev;
535         if(c == clients)
536                 clients = c->next;
537         c->next = c->prev = NULL;
538 }
539
540 void
541 detachstack(Client *c) {
542         Client **tc;
543
544         for(tc=&stack; *tc && *tc != c; tc=&(*tc)->snext);
545         *tc = c->snext;
546 }
547
548 void
549 drawbar(void) {
550         int i, x;
551         Client *c;
552
553         dc.x = 0;
554         for(c = stack; c && !isvisible(c); c = c->snext);
555         for(i = 0; i < LENGTH(tags); i++) {
556                 dc.w = textw(tags[i]);
557                 if(seltags[i]) {
558                         drawtext(tags[i], dc.sel, isurgent(i));
559                         drawsquare(c && c->tags[i], isoccupied(i), isurgent(i), dc.sel);
560                 }
561                 else {
562                         drawtext(tags[i], dc.norm, isurgent(i));
563                         drawsquare(c && c->tags[i], isoccupied(i), isurgent(i), dc.norm);
564                 }
565                 dc.x += dc.w;
566         }
567         dc.w = blw;
568         drawtext(lt->symbol, dc.norm, False);
569         x = dc.x + dc.w;
570         dc.w = textw(stext);
571         dc.x = bw - dc.w;
572         if(dc.x < x) {
573                 dc.x = x;
574                 dc.w = bw - x;
575         }
576         drawtext(stext, dc.norm, False);
577         if((dc.w = dc.x - x) > bh) {
578                 dc.x = x;
579                 if(c) {
580                         drawtext(c->name, dc.sel, False);
581                         drawsquare(False, c->isfloating, False, dc.sel);
582                 }
583                 else
584                         drawtext(NULL, dc.norm, False);
585         }
586         XCopyArea(dpy, dc.drawable, barwin, dc.gc, 0, 0, bw, bh, 0, 0);
587         XSync(dpy, False);
588 }
589
590 void
591 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
592         int x;
593         XGCValues gcv;
594         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
595
596         gcv.foreground = col[invert ? ColBG : ColFG];
597         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
598         x = (dc.font.ascent + dc.font.descent + 2) / 4;
599         r.x = dc.x + 1;
600         r.y = dc.y + 1;
601         if(filled) {
602                 r.width = r.height = x + 1;
603                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
604         }
605         else if(empty) {
606                 r.width = r.height = x;
607                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
608         }
609 }
610
611 void
612 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
613         int x, y, w, h;
614         unsigned int len, olen;
615         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
616
617         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
618         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
619         if(!text)
620                 return;
621         w = 0;
622         olen = len = strlen(text);
623         if(len >= sizeof buf)
624                 len = sizeof buf - 1;
625         memcpy(buf, text, len);
626         buf[len] = 0;
627         h = dc.font.ascent + dc.font.descent;
628         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
629         x = dc.x + (h / 2);
630         /* shorten text if necessary */
631         while(len && (w = textnw(buf, len)) > dc.w - h)
632                 buf[--len] = 0;
633         if(len < olen) {
634                 if(len > 1)
635                         buf[len - 1] = '.';
636                 if(len > 2)
637                         buf[len - 2] = '.';
638                 if(len > 3)
639                         buf[len - 3] = '.';
640         }
641         if(w > dc.w)
642                 return; /* too long */
643         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
644         if(dc.font.set)
645                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
646         else
647                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
648 }
649
650 void *
651 emallocz(unsigned int size) {
652         void *res = calloc(1, size);
653
654         if(!res)
655                 eprint("fatal: could not malloc() %u bytes\n", size);
656         return res;
657 }
658
659 void
660 enternotify(XEvent *e) {
661         Client *c;
662         XCrossingEvent *ev = &e->xcrossing;
663
664         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
665                 return;
666         if((c = getclient(ev->window)))
667                 focus(c);
668         else
669                 focus(NULL);
670 }
671
672 void
673 eprint(const char *errstr, ...) {
674         va_list ap;
675
676         va_start(ap, errstr);
677         vfprintf(stderr, errstr, ap);
678         va_end(ap);
679         exit(EXIT_FAILURE);
680 }
681
682 void
683 expose(XEvent *e) {
684         XExposeEvent *ev = &e->xexpose;
685
686         if(ev->count == 0 && (ev->window == barwin))
687                 drawbar();
688 }
689
690 void
691 floating(void) { /* default floating layout */
692         Client *c;
693
694         for(c = clients; c; c = c->next)
695                 if(isvisible(c))
696                         resize(c, c->x, c->y, c->w, c->h, True);
697 }
698
699 void
700 focus(Client *c) {
701         if(!c || (c && !isvisible(c)))
702                 for(c = stack; c && !isvisible(c); c = c->snext);
703         if(sel && sel != c) {
704                 grabbuttons(sel, False);
705                 XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
706         }
707         if(c) {
708                 detachstack(c);
709                 attachstack(c);
710                 grabbuttons(c, True);
711         }
712         sel = c;
713         if(c) {
714                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
715                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
716         }
717         else
718                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
719         drawbar();
720 }
721
722 void
723 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
724         XFocusChangeEvent *ev = &e->xfocus;
725
726         if(sel && ev->window != sel->win)
727                 XSetInputFocus(dpy, sel->win, RevertToPointerRoot, CurrentTime);
728 }
729
730 void
731 focusnext(const char *arg) {
732         Client *c;
733
734         if(!sel)
735                 return;
736         for(c = sel->next; c && !isvisible(c); c = c->next);
737         if(!c)
738                 for(c = clients; c && !isvisible(c); c = c->next);
739         if(c) {
740                 focus(c);
741                 restack();
742         }
743 }
744
745 void
746 focusprev(const char *arg) {
747         Client *c;
748
749         if(!sel)
750                 return;
751         for(c = sel->prev; c && !isvisible(c); c = c->prev);
752         if(!c) {
753                 for(c = clients; c && c->next; c = c->next);
754                 for(; c && !isvisible(c); c = c->prev);
755         }
756         if(c) {
757                 focus(c);
758                 restack();
759         }
760 }
761
762 Client *
763 getclient(Window w) {
764         Client *c;
765
766         for(c = clients; c && c->win != w; c = c->next);
767         return c;
768 }
769
770 unsigned long
771 getcolor(const char *colstr) {
772         Colormap cmap = DefaultColormap(dpy, screen);
773         XColor color;
774
775         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
776                 eprint("error, cannot allocate color '%s'\n", colstr);
777         return color.pixel;
778 }
779
780 long
781 getstate(Window w) {
782         int format, status;
783         long result = -1;
784         unsigned char *p = NULL;
785         unsigned long n, extra;
786         Atom real;
787
788         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
789                         &real, &format, &n, &extra, (unsigned char **)&p);
790         if(status != Success)
791                 return -1;
792         if(n != 0)
793                 result = *p;
794         XFree(p);
795         return result;
796 }
797
798 Bool
799 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
800         char **list = NULL;
801         int n;
802         XTextProperty name;
803
804         if(!text || size == 0)
805                 return False;
806         text[0] = '\0';
807         XGetTextProperty(dpy, w, &name, atom);
808         if(!name.nitems)
809                 return False;
810         if(name.encoding == XA_STRING)
811                 strncpy(text, (char *)name.value, size - 1);
812         else {
813                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
814                 && n > 0 && *list) {
815                         strncpy(text, *list, size - 1);
816                         XFreeStringList(list);
817                 }
818         }
819         text[size - 1] = '\0';
820         XFree(name.value);
821         return True;
822 }
823
824 void
825 grabbuttons(Client *c, Bool focused) {
826         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
827
828         if(focused) {
829                 XGrabButton(dpy, Button1, MODKEY, c->win, False, BUTTONMASK,
830                                 GrabModeAsync, GrabModeSync, None, None);
831                 XGrabButton(dpy, Button1, MODKEY|LockMask, c->win, False, BUTTONMASK,
832                                 GrabModeAsync, GrabModeSync, None, None);
833                 XGrabButton(dpy, Button1, MODKEY|numlockmask, c->win, False, BUTTONMASK,
834                                 GrabModeAsync, GrabModeSync, None, None);
835                 XGrabButton(dpy, Button1, MODKEY|numlockmask|LockMask, c->win, False, BUTTONMASK,
836                                 GrabModeAsync, GrabModeSync, None, None);
837
838                 XGrabButton(dpy, Button2, MODKEY, c->win, False, BUTTONMASK,
839                                 GrabModeAsync, GrabModeSync, None, None);
840                 XGrabButton(dpy, Button2, MODKEY|LockMask, c->win, False, BUTTONMASK,
841                                 GrabModeAsync, GrabModeSync, None, None);
842                 XGrabButton(dpy, Button2, MODKEY|numlockmask, c->win, False, BUTTONMASK,
843                                 GrabModeAsync, GrabModeSync, None, None);
844                 XGrabButton(dpy, Button2, MODKEY|numlockmask|LockMask, c->win, False, BUTTONMASK,
845                                 GrabModeAsync, GrabModeSync, None, None);
846
847                 XGrabButton(dpy, Button3, MODKEY, c->win, False, BUTTONMASK,
848                                 GrabModeAsync, GrabModeSync, None, None);
849                 XGrabButton(dpy, Button3, MODKEY|LockMask, c->win, False, BUTTONMASK,
850                                 GrabModeAsync, GrabModeSync, None, None);
851                 XGrabButton(dpy, Button3, MODKEY|numlockmask, c->win, False, BUTTONMASK,
852                                 GrabModeAsync, GrabModeSync, None, None);
853                 XGrabButton(dpy, Button3, MODKEY|numlockmask|LockMask, c->win, False, BUTTONMASK,
854                                 GrabModeAsync, GrabModeSync, None, None);
855         }
856         else
857                 XGrabButton(dpy, AnyButton, AnyModifier, c->win, False, BUTTONMASK,
858                                 GrabModeAsync, GrabModeSync, None, None);
859 }
860
861 void
862 grabkeys(void)  {
863         unsigned int i, j;
864         KeyCode code;
865         XModifierKeymap *modmap;
866
867         /* init modifier map */
868         modmap = XGetModifierMapping(dpy);
869         for(i = 0; i < 8; i++)
870                 for(j = 0; j < modmap->max_keypermod; j++) {
871                         if(modmap->modifiermap[i * modmap->max_keypermod + j] == XKeysymToKeycode(dpy, XK_Num_Lock))
872                                 numlockmask = (1 << i);
873                 }
874         XFreeModifiermap(modmap);
875
876         XUngrabKey(dpy, AnyKey, AnyModifier, root);
877         for(i = 0; i < LENGTH(keys); i++) {
878                 code = XKeysymToKeycode(dpy, keys[i].keysym);
879                 XGrabKey(dpy, code, keys[i].mod, root, True,
880                                 GrabModeAsync, GrabModeAsync);
881                 XGrabKey(dpy, code, keys[i].mod|LockMask, root, True,
882                                 GrabModeAsync, GrabModeAsync);
883                 XGrabKey(dpy, code, keys[i].mod|numlockmask, root, True,
884                                 GrabModeAsync, GrabModeAsync);
885                 XGrabKey(dpy, code, keys[i].mod|numlockmask|LockMask, root, True,
886                                 GrabModeAsync, GrabModeAsync);
887         }
888 }
889
890 unsigned int
891 idxoftag(const char *t) {
892         unsigned int i;
893
894         for(i = 0; (i < LENGTH(tags)) && (tags[i] != t); i++);
895         return (i < LENGTH(tags)) ? i : 0;
896 }
897
898 void
899 initfont(const char *fontstr) {
900         char *def, **missing;
901         int i, n;
902
903         missing = NULL;
904         if(dc.font.set)
905                 XFreeFontSet(dpy, dc.font.set);
906         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
907         if(missing) {
908                 while(n--)
909                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
910                 XFreeStringList(missing);
911         }
912         if(dc.font.set) {
913                 XFontSetExtents *font_extents;
914                 XFontStruct **xfonts;
915                 char **font_names;
916                 dc.font.ascent = dc.font.descent = 0;
917                 font_extents = XExtentsOfFontSet(dc.font.set);
918                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
919                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
920                         if(dc.font.ascent < (*xfonts)->ascent)
921                                 dc.font.ascent = (*xfonts)->ascent;
922                         if(dc.font.descent < (*xfonts)->descent)
923                                 dc.font.descent = (*xfonts)->descent;
924                         xfonts++;
925                 }
926         }
927         else {
928                 if(dc.font.xfont)
929                         XFreeFont(dpy, dc.font.xfont);
930                 dc.font.xfont = NULL;
931                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
932                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
933                         eprint("error, cannot load font: '%s'\n", fontstr);
934                 dc.font.ascent = dc.font.xfont->ascent;
935                 dc.font.descent = dc.font.xfont->descent;
936         }
937         dc.font.height = dc.font.ascent + dc.font.descent;
938 }
939
940 Bool
941 isoccupied(unsigned int t) {
942         Client *c;
943
944         for(c = clients; c; c = c->next)
945                 if(c->tags[t])
946                         return True;
947         return False;
948 }
949
950 Bool
951 isprotodel(Client *c) {
952         int i, n;
953         Atom *protocols;
954         Bool ret = False;
955
956         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
957                 for(i = 0; !ret && i < n; i++)
958                         if(protocols[i] == wmatom[WMDelete])
959                                 ret = True;
960                 XFree(protocols);
961         }
962         return ret;
963 }
964
965 Bool
966 isurgent(unsigned int t) {
967         Client *c;
968
969         for(c = clients; c; c = c->next)
970                 if(c->isurgent && c->tags[t])
971                         return True;
972         return False;
973 }
974
975 Bool
976 isvisible(Client *c) {
977         unsigned int i;
978
979         for(i = 0; i < LENGTH(tags); i++)
980                 if(c->tags[i] && seltags[i])
981                         return True;
982         return False;
983 }
984
985 void
986 keypress(XEvent *e) {
987         unsigned int i;
988         KeySym keysym;
989         XKeyEvent *ev;
990
991         ev = &e->xkey;
992         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
993         for(i = 0; i < LENGTH(keys); i++)
994                 if(keysym == keys[i].keysym
995                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state))
996                 {
997                         if(keys[i].func)
998                                 keys[i].func(keys[i].arg);
999                 }
1000 }
1001
1002 void
1003 killclient(const char *arg) {
1004         XEvent ev;
1005
1006         if(!sel)
1007                 return;
1008         if(isprotodel(sel)) {
1009                 ev.type = ClientMessage;
1010                 ev.xclient.window = sel->win;
1011                 ev.xclient.message_type = wmatom[WMProtocols];
1012                 ev.xclient.format = 32;
1013                 ev.xclient.data.l[0] = wmatom[WMDelete];
1014                 ev.xclient.data.l[1] = CurrentTime;
1015                 XSendEvent(dpy, sel->win, False, NoEventMask, &ev);
1016         }
1017         else
1018                 XKillClient(dpy, sel->win);
1019 }
1020
1021 void
1022 manage(Window w, XWindowAttributes *wa) {
1023         Client *c, *t = NULL;
1024         Status rettrans;
1025         Window trans;
1026         XWindowChanges wc;
1027
1028         c = emallocz(sizeof(Client));
1029         c->tags = emallocz(TAGSZ);
1030         c->win = w;
1031
1032         /* geometry */
1033         c->x = wa->x;
1034         c->y = wa->y;
1035         c->w = wa->width;
1036         c->h = wa->height;
1037         c->oldborder = wa->border_width;
1038         if(c->w == sw && c->h == sh) {
1039                 c->x = sx;
1040                 c->y = sy;
1041                 c->border = wa->border_width;
1042         }
1043         else {
1044                 if(c->x + c->w + 2 * c->border > wx + ww)
1045                         c->x = wx + ww - c->w - 2 * c->border;
1046                 if(c->y + c->h + 2 * c->border > wy + wh)
1047                         c->y = wy + wh - c->h - 2 * c->border;
1048                 if(c->x < wx)
1049                         c->x = wx;
1050                 if(c->y < wy)
1051                         c->y = wy;
1052                 c->border = BORDERPX;
1053         }
1054
1055         wc.border_width = c->border;
1056         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1057         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1058         configure(c); /* propagates border_width, if size doesn't change */
1059         updatesizehints(c);
1060         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1061         grabbuttons(c, False);
1062         updatetitle(c);
1063         if((rettrans = XGetTransientForHint(dpy, w, &trans) == Success))
1064                 for(t = clients; t && t->win != trans; t = t->next);
1065         if(t)
1066                 memcpy(c->tags, t->tags, TAGSZ);
1067         else
1068                 applyrules(c);
1069         if(!c->isfloating)
1070                 c->isfloating = (rettrans == Success) || c->isfixed;
1071         attach(c);
1072         attachstack(c);
1073         XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h); /* some windows require this */
1074         ban(c);
1075         XMapWindow(dpy, c->win);
1076         setclientstate(c, NormalState);
1077         arrange();
1078 }
1079
1080 void
1081 mappingnotify(XEvent *e) {
1082         XMappingEvent *ev = &e->xmapping;
1083
1084         XRefreshKeyboardMapping(ev);
1085         if(ev->request == MappingKeyboard)
1086                 grabkeys();
1087 }
1088
1089 void
1090 maprequest(XEvent *e) {
1091         static XWindowAttributes wa;
1092         XMapRequestEvent *ev = &e->xmaprequest;
1093
1094         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1095                 return;
1096         if(wa.override_redirect)
1097                 return;
1098         if(!getclient(ev->window))
1099                 manage(ev->window, &wa);
1100 }
1101
1102 void
1103 monocle(void) {
1104         Client *c;
1105
1106         for(c = clients; c; c = c->next)
1107                 if(isvisible(c))
1108                         resize(c, mox, moy, mow, moh, RESIZEHINTS);
1109 }
1110
1111 void
1112 movemouse(Client *c) {
1113         int x1, y1, ocx, ocy, di, nx, ny;
1114         unsigned int dui;
1115         Window dummy;
1116         XEvent ev;
1117
1118         ocx = nx = c->x;
1119         ocy = ny = c->y;
1120         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1121                         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1122                 return;
1123         XQueryPointer(dpy, root, &dummy, &dummy, &x1, &y1, &di, &di, &dui);
1124         for(;;) {
1125                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1126                 switch (ev.type) {
1127                 case ButtonRelease:
1128                         XUngrabPointer(dpy, CurrentTime);
1129                         return;
1130                 case ConfigureRequest:
1131                 case Expose:
1132                 case MapRequest:
1133                         handler[ev.type](&ev);
1134                         break;
1135                 case MotionNotify:
1136                         XSync(dpy, False);
1137                         nx = ocx + (ev.xmotion.x - x1);
1138                         ny = ocy + (ev.xmotion.y - y1);
1139                         if(abs(wx - nx) < SNAP)
1140                                 nx = wx;
1141                         else if(abs((wx + ww) - (nx + c->w + 2 * c->border)) < SNAP)
1142                                 nx = wx + ww - c->w - 2 * c->border;
1143                         if(abs(wy - ny) < SNAP)
1144                                 ny = wy;
1145                         else if(abs((wy + wh) - (ny + c->h + 2 * c->border)) < SNAP)
1146                                 ny = wy + wh - c->h - 2 * c->border;
1147                         if(!c->isfloating && !lt->isfloating && (abs(nx - c->x) > SNAP || abs(ny - c->y) > SNAP))
1148                                 togglefloating(NULL);
1149                         if((lt->isfloating) || c->isfloating)
1150                                 resize(c, nx, ny, c->w, c->h, False);
1151                         break;
1152                 }
1153         }
1154 }
1155
1156 Client *
1157 nexttiled(Client *c) {
1158         for(; c && (c->isfloating || !isvisible(c)); c = c->next);
1159         return c;
1160 }
1161
1162 void
1163 propertynotify(XEvent *e) {
1164         Client *c;
1165         Window trans;
1166         XPropertyEvent *ev = &e->xproperty;
1167
1168         if(ev->state == PropertyDelete)
1169                 return; /* ignore */
1170         if((c = getclient(ev->window))) {
1171                 switch (ev->atom) {
1172                 default: break;
1173                 case XA_WM_TRANSIENT_FOR:
1174                         XGetTransientForHint(dpy, c->win, &trans);
1175                         if(!c->isfloating && (c->isfloating = (getclient(trans) != NULL)))
1176                                 arrange();
1177                         break;
1178                 case XA_WM_NORMAL_HINTS:
1179                         updatesizehints(c);
1180                         break;
1181                 case XA_WM_HINTS:
1182                         updatewmhints(c);
1183                         drawbar();
1184                         break;
1185                 }
1186                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1187                         updatetitle(c);
1188                         if(c == sel)
1189                                 drawbar();
1190                 }
1191         }
1192 }
1193
1194 void
1195 quit(const char *arg) {
1196         readin = running = False;
1197 }
1198
1199 void
1200 reapply(const char *arg) {
1201         static Bool zerotags[LENGTH(tags)] = { 0 };
1202         Client *c;
1203
1204         for(c = clients; c; c = c->next) {
1205                 memcpy(c->tags, zerotags, sizeof zerotags);
1206                 applyrules(c);
1207         }
1208         arrange();
1209 }
1210
1211 void
1212 resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
1213         XWindowChanges wc;
1214
1215         if(sizehints) {
1216                 /* set minimum possible */
1217                 if (w < 1)
1218                         w = 1;
1219                 if (h < 1)
1220                         h = 1;
1221
1222                 /* temporarily remove base dimensions */
1223                 w -= c->basew;
1224                 h -= c->baseh;
1225
1226                 /* adjust for aspect limits */
1227                 if (c->minay > 0 && c->maxay > 0 && c->minax > 0 && c->maxax > 0) {
1228                         if (w * c->maxay > h * c->maxax)
1229                                 w = h * c->maxax / c->maxay;
1230                         else if (w * c->minay < h * c->minax)
1231                                 h = w * c->minay / c->minax;
1232                 }
1233
1234                 /* adjust for increment value */
1235                 if(c->incw)
1236                         w -= w % c->incw;
1237                 if(c->inch)
1238                         h -= h % c->inch;
1239
1240                 /* restore base dimensions */
1241                 w += c->basew;
1242                 h += c->baseh;
1243
1244                 if(c->minw > 0 && w < c->minw)
1245                         w = c->minw;
1246                 if(c->minh > 0 && h < c->minh)
1247                         h = c->minh;
1248                 if(c->maxw > 0 && w > c->maxw)
1249                         w = c->maxw;
1250                 if(c->maxh > 0 && h > c->maxh)
1251                         h = c->maxh;
1252         }
1253         if(w <= 0 || h <= 0)
1254                 return;
1255         if(x > sx + sw)
1256                 x = sw - w - 2 * c->border;
1257         if(y > sy + sh)
1258                 y = sh - h - 2 * c->border;
1259         if(x + w + 2 * c->border < sx)
1260                 x = sx;
1261         if(y + h + 2 * c->border < sy)
1262                 y = sy;
1263         if(c->x != x || c->y != y || c->w != w || c->h != h) {
1264                 c->x = wc.x = x;
1265                 c->y = wc.y = y;
1266                 c->w = wc.width = w;
1267                 c->h = wc.height = h;
1268                 wc.border_width = c->border;
1269                 XConfigureWindow(dpy, c->win,
1270                                 CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1271                 configure(c);
1272                 XSync(dpy, False);
1273         }
1274 }
1275
1276 void
1277 resizemouse(Client *c) {
1278         int ocx, ocy;
1279         int nw, nh;
1280         XEvent ev;
1281
1282         ocx = c->x;
1283         ocy = c->y;
1284         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1285                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1286                 return;
1287         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->border - 1, c->h + c->border - 1);
1288         for(;;) {
1289                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask , &ev);
1290                 switch(ev.type) {
1291                 case ButtonRelease:
1292                         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0,
1293                                         c->w + c->border - 1, c->h + c->border - 1);
1294                         XUngrabPointer(dpy, CurrentTime);
1295                         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1296                         return;
1297                 case ConfigureRequest:
1298                 case Expose:
1299                 case MapRequest:
1300                         handler[ev.type](&ev);
1301                         break;
1302                 case MotionNotify:
1303                         XSync(dpy, False);
1304                         if((nw = ev.xmotion.x - ocx - 2 * c->border + 1) <= 0)
1305                                 nw = 1;
1306                         if((nh = ev.xmotion.y - ocy - 2 * c->border + 1) <= 0)
1307                                 nh = 1;
1308                         if(!c->isfloating && !lt->isfloating && (abs(nw - c->w) > SNAP || abs(nh - c->h) > SNAP))
1309                                 togglefloating(NULL);
1310                         if((lt->isfloating) || c->isfloating)
1311                                 resize(c, c->x, c->y, nw, nh, True);
1312                         break;
1313                 }
1314         }
1315 }
1316
1317 void
1318 restack(void) {
1319         Client *c;
1320         XEvent ev;
1321         XWindowChanges wc;
1322
1323         drawbar();
1324         if(!sel)
1325                 return;
1326         if(sel->isfloating || lt->isfloating)
1327                 XRaiseWindow(dpy, sel->win);
1328         if(!lt->isfloating) {
1329                 wc.stack_mode = Below;
1330                 wc.sibling = barwin;
1331                 if(!sel->isfloating) {
1332                         XConfigureWindow(dpy, sel->win, CWSibling|CWStackMode, &wc);
1333                         wc.sibling = sel->win;
1334                 }
1335                 for(c = nexttiled(clients); c; c = nexttiled(c->next)) {
1336                         if(c == sel)
1337                                 continue;
1338                         XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1339                         wc.sibling = c->win;
1340                 }
1341         }
1342         XSync(dpy, False);
1343         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1344 }
1345
1346 void
1347 run(void) {
1348         char *p;
1349         char sbuf[sizeof stext];
1350         fd_set rd;
1351         int r, xfd;
1352         unsigned int len, offset;
1353         XEvent ev;
1354
1355         /* main event loop, also reads status text from stdin */
1356         XSync(dpy, False);
1357         xfd = ConnectionNumber(dpy);
1358         readin = True;
1359         offset = 0;
1360         len = sizeof stext - 1;
1361         sbuf[len] = stext[len] = '\0'; /* 0-terminator is never touched */
1362         while(running) {
1363                 FD_ZERO(&rd);
1364                 if(readin)
1365                         FD_SET(STDIN_FILENO, &rd);
1366                 FD_SET(xfd, &rd);
1367                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
1368                         if(errno == EINTR)
1369                                 continue;
1370                         eprint("select failed\n");
1371                 }
1372                 if(FD_ISSET(STDIN_FILENO, &rd)) {
1373                         switch((r = read(STDIN_FILENO, sbuf + offset, len - offset))) {
1374                         case -1:
1375                                 strncpy(stext, strerror(errno), len);
1376                                 readin = False;
1377                                 break;
1378                         case 0:
1379                                 strncpy(stext, "EOF", 4);
1380                                 readin = False;
1381                                 break;
1382                         default:
1383                                 for(p = sbuf + offset; r > 0; p++, r--, offset++)
1384                                         if(*p == '\n' || *p == '\0') {
1385                                                 *p = '\0';
1386                                                 strncpy(stext, sbuf, len);
1387                                                 p += r - 1; /* p is sbuf + offset + r - 1 */
1388                                                 for(r = 0; *(p - r) && *(p - r) != '\n'; r++);
1389                                                 offset = r;
1390                                                 if(r)
1391                                                         memmove(sbuf, p - r + 1, r);
1392                                                 break;
1393                                         }
1394                                 break;
1395                         }
1396                         drawbar();
1397                 }
1398                 while(XPending(dpy)) {
1399                         XNextEvent(dpy, &ev);
1400                         if(handler[ev.type])
1401                                 (handler[ev.type])(&ev); /* call handler */
1402                 }
1403         }
1404 }
1405
1406 void
1407 scan(void) {
1408         unsigned int i, num;
1409         Window *wins, d1, d2;
1410         XWindowAttributes wa;
1411
1412         wins = NULL;
1413         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1414                 for(i = 0; i < num; i++) {
1415                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1416                                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1417                                 continue;
1418                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1419                                 manage(wins[i], &wa);
1420                 }
1421                 for(i = 0; i < num; i++) { /* now the transients */
1422                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1423                                 continue;
1424                         if(XGetTransientForHint(dpy, wins[i], &d1)
1425                                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1426                                 manage(wins[i], &wa);
1427                 }
1428         }
1429         if(wins)
1430                 XFree(wins);
1431 }
1432
1433 void
1434 setclientstate(Client *c, long state) {
1435         long data[] = {state, None};
1436
1437         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1438                         PropModeReplace, (unsigned char *)data, 2);
1439 }
1440
1441 double
1442 getdouble(const char *s) {
1443         char *endp;
1444         double result = 0;
1445
1446         switch(*s) {
1447         default: 
1448                 result = strtod(s, &endp);
1449                 if(s == endp || *endp != 0)
1450                         result = strtol(s, &endp, 0);
1451                 break;
1452         case 'B': result = dc.font.height + 2; break;
1453         case 'W': result = sw; break;
1454         case 'H': result = sh; break;
1455         }
1456         return result;
1457 }
1458
1459 void
1460 setgeom(const char *arg) {
1461         applygeometry(arg);
1462         updatebarpos();
1463         arrange();
1464 }
1465
1466 void
1467 setlayout(const char *arg) {
1468         static Layout *revert = 0;
1469         unsigned int i;
1470
1471         if(!arg)
1472                 return;
1473         for(i = 0; i < LENGTH(layouts); i++)
1474                 if(!strcmp(arg, layouts[i].symbol))
1475                         break;
1476         if(i == LENGTH(layouts))
1477                 return;
1478         if(revert && &layouts[i] == lt)
1479                 lt = revert;
1480         else {
1481                 revert = lt;
1482                 lt = &layouts[i];
1483         }
1484         if(sel)
1485                 arrange();
1486         else
1487                 drawbar();
1488 }
1489
1490 void
1491 setup(void) {
1492         unsigned int i;
1493         XSetWindowAttributes wa;
1494
1495         /* init screen */
1496         screen = DefaultScreen(dpy);
1497         root = RootWindow(dpy, screen);
1498         initfont(FONT);
1499
1500         /* apply default dimensions */
1501         sx = 0;
1502         sy = 0;
1503         sw = DisplayWidth(dpy, screen);
1504         sh = DisplayHeight(dpy, screen);
1505         applygeometry(GEOMETRY);
1506
1507         /* init atoms */
1508         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1509         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1510         wmatom[WMName] = XInternAtom(dpy, "WM_NAME", False);
1511         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1512         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1513         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1514
1515         /* init cursors */
1516         wa.cursor = cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1517         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1518         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1519
1520         /* init appearance */
1521         dc.norm[ColBorder] = getcolor(NORMBORDERCOLOR);
1522         dc.norm[ColBG] = getcolor(NORMBGCOLOR);
1523         dc.norm[ColFG] = getcolor(NORMFGCOLOR);
1524         dc.sel[ColBorder] = getcolor(SELBORDERCOLOR);
1525         dc.sel[ColBG] = getcolor(SELBGCOLOR);
1526         dc.sel[ColFG] = getcolor(SELFGCOLOR);
1527         initfont(FONT);
1528         dc.h = bh;
1529         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1530         dc.gc = XCreateGC(dpy, root, 0, 0);
1531         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1532         if(!dc.font.set)
1533                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1534
1535         /* init tags */
1536         seltags = emallocz(TAGSZ);
1537         prevtags = emallocz(TAGSZ);
1538         seltags[0] = prevtags[0] = True;
1539
1540         /* init layouts */
1541         lt = &layouts[0];
1542
1543         /* init bar */
1544         for(blw = i = 0; i < LENGTH(layouts); i++) {
1545                 i = textw(layouts[i].symbol);
1546                 if(i > blw)
1547                         blw = i;
1548         }
1549
1550         wa.override_redirect = 1;
1551         wa.background_pixmap = ParentRelative;
1552         wa.event_mask = ButtonPressMask|ExposureMask;
1553
1554         barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
1555                                 CopyFromParent, DefaultVisual(dpy, screen),
1556                                 CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1557         XDefineCursor(dpy, barwin, cursor[CurNormal]);
1558         XMapRaised(dpy, barwin);
1559         strcpy(stext, "dwm-"VERSION);
1560         drawbar();
1561
1562         /* EWMH support per view */
1563         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1564                         PropModeReplace, (unsigned char *) netatom, NetLast);
1565
1566         /* select for events */
1567         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
1568                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask;
1569         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1570         XSelectInput(dpy, root, wa.event_mask);
1571
1572
1573         /* grab keys */
1574         grabkeys();
1575 }
1576
1577 void
1578 spawn(const char *arg) {
1579         static char *shell = NULL;
1580
1581         if(!shell && !(shell = getenv("SHELL")))
1582                 shell = "/bin/sh";
1583         if(!arg)
1584                 return;
1585         /* The double-fork construct avoids zombie processes and keeps the code
1586          * clean from stupid signal handlers. */
1587         if(fork() == 0) {
1588                 if(fork() == 0) {
1589                         if(dpy)
1590                                 close(ConnectionNumber(dpy));
1591                         setsid();
1592                         execl(shell, shell, "-c", arg, (char *)NULL);
1593                         fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg);
1594                         perror(" failed");
1595                 }
1596                 exit(0);
1597         }
1598         wait(0);
1599 }
1600
1601 void
1602 tag(const char *arg) {
1603         unsigned int i;
1604
1605         if(!sel)
1606                 return;
1607         for(i = 0; i < LENGTH(tags); i++)
1608                 sel->tags[i] = (NULL == arg);
1609         sel->tags[idxoftag(arg)] = True;
1610         arrange();
1611 }
1612
1613 unsigned int
1614 textnw(const char *text, unsigned int len) {
1615         XRectangle r;
1616
1617         if(dc.font.set) {
1618                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1619                 return r.width;
1620         }
1621         return XTextWidth(dc.font.xfont, text, len);
1622 }
1623
1624 unsigned int
1625 textw(const char *text) {
1626         return textnw(text, strlen(text)) + dc.font.height;
1627 }
1628
1629 void
1630 tileh(void) {
1631         int x, w;
1632         unsigned int i, n = counttiled();
1633         Client *c;
1634
1635         if(n == 0)
1636                 return;
1637         c = tilemaster(n);
1638         if(--n == 0)
1639                 return;
1640
1641         x = tx;
1642         w = tw / n;
1643         if(w < bh)
1644                 w = tw;
1645
1646         for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
1647                 if(i + 1 == n) /* remainder */
1648                         tileresize(c, x, ty, (tx + tw) - x - 2 * c->border, th - 2 * c->border);
1649                 else
1650                         tileresize(c, x, ty, w - 2 * c->border, th - 2 * c->border);
1651                 if(w != tw)
1652                         x = c->x + c->w + 2 * c->border;
1653         }
1654 }
1655
1656 Client *
1657 tilemaster(unsigned int n) {
1658         Client *c = nexttiled(clients);
1659
1660         if(n == 1)
1661                 tileresize(c, mox, moy, mow - 2 * c->border, moh - 2 * c->border);
1662         else
1663                 tileresize(c, mx, my, mw - 2 * c->border, mh - 2 * c->border);
1664         return c;
1665 }
1666
1667 void
1668 tileresize(Client *c, int x, int y, int w, int h) {
1669         resize(c, x, y, w, h, RESIZEHINTS);
1670         if((RESIZEHINTS) && ((c->h < bh) || (c->h > h) || (c->w < bh) || (c->w > w)))
1671                 /* client doesn't accept size constraints */
1672                 resize(c, x, y, w, h, False);
1673 }
1674
1675 void
1676 tilev(void) {
1677         int y, h;
1678         unsigned int i, n = counttiled();
1679         Client *c;
1680
1681         if(n == 0)
1682                 return;
1683         c = tilemaster(n);
1684         if(--n == 0)
1685                 return;
1686
1687         y = ty;
1688         h = th / n;
1689         if(h < bh)
1690                 h = th;
1691
1692         for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
1693                 if(i + 1 == n) /* remainder */
1694                         tileresize(c, tx, y, tw - 2 * c->border, (ty + th) - y - 2 * c->border);
1695                 else
1696                         tileresize(c, tx, y, tw - 2 * c->border, h - 2 * c->border);
1697                 if(h != th)
1698                         y = c->y + c->h + 2 * c->border;
1699         }
1700 }
1701
1702 void
1703 togglefloating(const char *arg) {
1704         if(!sel)
1705                 return;
1706         sel->isfloating = !sel->isfloating;
1707         if(sel->isfloating)
1708                 resize(sel, sel->x, sel->y, sel->w, sel->h, True);
1709         arrange();
1710 }
1711
1712 void
1713 toggletag(const char *arg) {
1714         unsigned int i, j;
1715
1716         if(!sel)
1717                 return;
1718         i = idxoftag(arg);
1719         sel->tags[i] = !sel->tags[i];
1720         for(j = 0; j < LENGTH(tags) && !sel->tags[j]; j++);
1721         if(j == LENGTH(tags))
1722                 sel->tags[i] = True; /* at least one tag must be enabled */
1723         arrange();
1724 }
1725
1726 void
1727 toggleview(const char *arg) {
1728         unsigned int i, j;
1729
1730         i = idxoftag(arg);
1731         seltags[i] = !seltags[i];
1732         for(j = 0; j < LENGTH(tags) && !seltags[j]; j++);
1733         if(j == LENGTH(tags))
1734                 seltags[i] = True; /* at least one tag must be viewed */
1735         arrange();
1736 }
1737
1738 void
1739 unban(Client *c) {
1740         if(!c->isbanned)
1741                 return;
1742         XMoveWindow(dpy, c->win, c->x, c->y);
1743         c->isbanned = False;
1744 }
1745
1746 void
1747 unmanage(Client *c) {
1748         XWindowChanges wc;
1749
1750         wc.border_width = c->oldborder;
1751         /* The server grab construct avoids race conditions. */
1752         XGrabServer(dpy);
1753         XSetErrorHandler(xerrordummy);
1754         XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1755         detach(c);
1756         detachstack(c);
1757         if(sel == c)
1758                 focus(NULL);
1759         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1760         setclientstate(c, WithdrawnState);
1761         free(c->tags);
1762         free(c);
1763         XSync(dpy, False);
1764         XSetErrorHandler(xerror);
1765         XUngrabServer(dpy);
1766         arrange();
1767 }
1768
1769 void
1770 unmapnotify(XEvent *e) {
1771         Client *c;
1772         XUnmapEvent *ev = &e->xunmap;
1773
1774         if((c = getclient(ev->window)))
1775                 unmanage(c);
1776 }
1777
1778 void
1779 updatebarpos(void) {
1780
1781         if(dc.drawable != 0)
1782                 XFreePixmap(dpy, dc.drawable);
1783         dc.drawable = XCreatePixmap(dpy, root, bw, bh, DefaultDepth(dpy, screen));
1784         XMoveResizeWindow(dpy, barwin, bx, by, bw, bh);
1785 }
1786
1787 void
1788 updatesizehints(Client *c) {
1789         long msize;
1790         XSizeHints size;
1791
1792         if(!XGetWMNormalHints(dpy, c->win, &size, &msize) || !size.flags)
1793                 size.flags = PSize;
1794         c->flags = size.flags;
1795         if(c->flags & PBaseSize) {
1796                 c->basew = size.base_width;
1797                 c->baseh = size.base_height;
1798         }
1799         else if(c->flags & PMinSize) {
1800                 c->basew = size.min_width;
1801                 c->baseh = size.min_height;
1802         }
1803         else
1804                 c->basew = c->baseh = 0;
1805         if(c->flags & PResizeInc) {
1806                 c->incw = size.width_inc;
1807                 c->inch = size.height_inc;
1808         }
1809         else
1810                 c->incw = c->inch = 0;
1811         if(c->flags & PMaxSize) {
1812                 c->maxw = size.max_width;
1813                 c->maxh = size.max_height;
1814         }
1815         else
1816                 c->maxw = c->maxh = 0;
1817         if(c->flags & PMinSize) {
1818                 c->minw = size.min_width;
1819                 c->minh = size.min_height;
1820         }
1821         else if(c->flags & PBaseSize) {
1822                 c->minw = size.base_width;
1823                 c->minh = size.base_height;
1824         }
1825         else
1826                 c->minw = c->minh = 0;
1827         if(c->flags & PAspect) {
1828                 c->minax = size.min_aspect.x;
1829                 c->maxax = size.max_aspect.x;
1830                 c->minay = size.min_aspect.y;
1831                 c->maxay = size.max_aspect.y;
1832         }
1833         else
1834                 c->minax = c->maxax = c->minay = c->maxay = 0;
1835         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1836                         && c->maxw == c->minw && c->maxh == c->minh);
1837 }
1838
1839 void
1840 updatetitle(Client *c) {
1841         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1842                 gettextprop(c->win, wmatom[WMName], c->name, sizeof c->name);
1843 }
1844
1845 void
1846 updatewmhints(Client *c) {
1847         XWMHints *wmh;
1848
1849         if((wmh = XGetWMHints(dpy, c->win))) {
1850                 if(c == sel)
1851                         sel->isurgent = False;
1852                 else
1853                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1854                 XFree(wmh);
1855         }
1856 }
1857
1858
1859 void
1860 view(const char *arg) {
1861         unsigned int i;
1862
1863         for(i = 0; i < LENGTH(tags); i++)
1864                 tmp[i] = (NULL == arg);
1865         tmp[idxoftag(arg)] = True;
1866
1867         if(memcmp(seltags, tmp, TAGSZ) != 0) {
1868                 memcpy(prevtags, seltags, TAGSZ);
1869                 memcpy(seltags, tmp, TAGSZ);
1870                 arrange();
1871         }
1872 }
1873
1874 void
1875 viewprevtag(const char *arg) {
1876
1877         memcpy(tmp, seltags, TAGSZ);
1878         memcpy(seltags, prevtags, TAGSZ);
1879         memcpy(prevtags, tmp, TAGSZ);
1880         arrange();
1881 }
1882
1883 /* There's no way to check accesses to destroyed windows, thus those cases are
1884  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1885  * default error handler, which may call exit.  */
1886 int
1887 xerror(Display *dpy, XErrorEvent *ee) {
1888         if(ee->error_code == BadWindow
1889         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1890         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1891         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1892         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1893         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1894         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1895         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1896                 return 0;
1897         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1898                 ee->request_code, ee->error_code);
1899         return xerrorxlib(dpy, ee); /* may call exit */
1900 }
1901
1902 int
1903 xerrordummy(Display *dpy, XErrorEvent *ee) {
1904         return 0;
1905 }
1906
1907 /* Startup Error handler to check if another window manager
1908  * is already running. */
1909 int
1910 xerrorstart(Display *dpy, XErrorEvent *ee) {
1911         otherwm = True;
1912         return -1;
1913 }
1914
1915 void
1916 zoom(const char *arg) {
1917         Client *c = sel;
1918
1919         if(!sel || lt->isfloating || sel->isfloating)
1920                 return;
1921         if(c == nexttiled(clients))
1922                 if(!(c = nexttiled(c->next)))
1923                         return;
1924         detach(c);
1925         attach(c);
1926         focus(c);
1927         arrange();
1928 }
1929
1930 int
1931 main(int argc, char *argv[]) {
1932         if(argc == 2 && !strcmp("-v", argv[1]))
1933                 eprint("dwm-"VERSION", © 2006-2008 dwm engineers, see LICENSE for details\n");
1934         else if(argc != 1)
1935                 eprint("usage: dwm [-v]\n");
1936
1937         setlocale(LC_CTYPE, "");
1938         if(!(dpy = XOpenDisplay(0)))
1939                 eprint("dwm: cannot open display\n");
1940
1941         checkotherwm();
1942         setup();
1943         scan();
1944         run();
1945         cleanup();
1946
1947         XCloseDisplay(dpy);
1948         return 0;
1949 }