main.c

   1 /* © 2006-2007 Anselm R. Garbe <garbeam at gmail dot com>
   2  * © 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
   3  * © 2006-2007 Jukka Salmi <jukka at salmi dot ch>
   4  * © 2007 Premysl Hruby <dfenze at gmail dot com>
   5  * © 2007 Szabolcs Nagy <nszabolcs at gmail dot com>
   6  * See LICENSE file for license details. */
   7 #include "dwm.h"
   8 #include <errno.h>
   9 #include <locale.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <unistd.h>
  14 #include <sys/select.h>
  15 #include <X11/cursorfont.h>
  16 #include <X11/keysym.h>
  17 #include <X11/Xatom.h>
  18 #include <X11/Xproto.h>
  19
  20 /* extern */
  21
  22 char stext[256];
  23 int screen, sx, sy, sw, sh, wax, way, waw, wah;
  24 unsigned int bh, bpos, ntags, numlockmask;
  25 Atom wmatom[WMLast], netatom[NetLast];
  26 Bool *seltag;
  27 Bool selscreen = True;
  28 Client *clients = NULL;
  29 Client *sel = NULL;
  30 Client *stack = NULL;
  31 Cursor cursor[CurLast];
  32 Display *dpy;
  33 DC dc = {0};
  34 Window root, barwin;
  35
  36 /* static */
  37
  38 static int (*xerrorxlib)(Display *, XErrorEvent *);
  39 static Bool otherwm, readin;
  40 static Bool running = True;
  41
  42 static void
  43 cleanup(void) {
  44         close(STDIN_FILENO);
  45         while(stack) {
  46                 if(stack->isbanned)
  47                         XMoveWindow(dpy, stack->win, stack->x, stack->y);
  48                 unmanage(stack);
  49         }
  50         if(dc.font.set)
  51                 XFreeFontSet(dpy, dc.font.set);
  52         else
  53                 XFreeFont(dpy, dc.font.xfont);
  54         XUngrabKey(dpy, AnyKey, AnyModifier, root);
  55         XFreePixmap(dpy, dc.drawable);
  56         XFreeGC(dpy, dc.gc);
  57         XDestroyWindow(dpy, barwin);
  58         XFreeCursor(dpy, cursor[CurNormal]);
  59         XFreeCursor(dpy, cursor[CurResize]);
  60         XFreeCursor(dpy, cursor[CurMove]);
  61         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
  62         XSync(dpy, False);
  63         free(seltag);
  64 }
  65
  66 static unsigned long
  67 initcolor(const char *colstr) {
  68         Colormap cmap = DefaultColormap(dpy, screen);
  69         XColor color;
  70
  71         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
  72                 eprint("error, cannot allocate color '%s'\n", colstr);
  73         return color.pixel;
  74 }
  75
  76 static void
  77 initfont(const char *fontstr) {
  78         char *def, **missing;
  79         int i, n;
  80
  81         missing = NULL;
  82         if(dc.font.set)
  83                 XFreeFontSet(dpy, dc.font.set);
  84         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
  85         if(missing) {
  86                 while(n--)
  87                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
  88                 XFreeStringList(missing);
  89         }
  90         if(dc.font.set) {
  91                 XFontSetExtents *font_extents;
  92                 XFontStruct **xfonts;
  93                 char **font_names;
  94                 dc.font.ascent = dc.font.descent = 0;
  95                 font_extents = XExtentsOfFontSet(dc.font.set);
  96                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
  97                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
  98                         if(dc.font.ascent < (*xfonts)->ascent)
  99                                 dc.font.ascent = (*xfonts)->ascent;
 100                         if(dc.font.descent < (*xfonts)->descent)
 101                                 dc.font.descent = (*xfonts)->descent;
 102                         xfonts++;
 103                 }
 104         }
 105         else {
 106                 if(dc.font.xfont)
 107                         XFreeFont(dpy, dc.font.xfont);
 108                 dc.font.xfont = NULL;
 109                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
 110                         eprint("error, cannot load font: '%s'\n", fontstr);
 111                 dc.font.ascent = dc.font.xfont->ascent;
 112                 dc.font.descent = dc.font.xfont->descent;
 113         }
 114         dc.font.height = dc.font.ascent + dc.font.descent;
 115 }
 116
 117 static void
 118 scan(void) {
 119         unsigned int i, num;
 120         Window *wins, d1, d2;
 121         XWindowAttributes wa;
 122
 123         wins = NULL;
 124         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 125                 for(i = 0; i < num; i++) {
 126                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
 127                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 128                                 continue;
 129                         if(wa.map_state == IsViewable)
 130                                 manage(wins[i], &wa);
 131                 }
 132         }
 133         if(wins)
 134                 XFree(wins);
 135 }
 136
 137 static void
 138 setup(void) {
 139         int i, j;
 140         unsigned int mask;
 141         Window w;
 142         XModifierKeymap *modmap;
 143         XSetWindowAttributes wa;
 144
 145         /* init atoms */
 146         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 147         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 148         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 149         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 150         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 151         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 152                         PropModeReplace, (unsigned char *) netatom, NetLast);
 153         /* init cursors */
 154         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 155         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 156         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 157         /* init modifier map */
 158         numlockmask = 0;
 159         modmap = XGetModifierMapping(dpy);
 160         for (i = 0; i < 8; i++)
 161                 for (j = 0; j < modmap->max_keypermod; j++) {
 162                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 163                                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 164                                 numlockmask = (1 << i);
 165                 }
 166         XFreeModifiermap(modmap);
 167         /* select for events */
 168         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 169                 | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 170         wa.cursor = cursor[CurNormal];
 171         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 172         XSelectInput(dpy, root, wa.event_mask);
 173         grabkeys();
 174         compileregs();
 175         for(ntags = 0; tags[ntags]; ntags++);
 176         seltag = emallocz(sizeof(Bool) * ntags);
 177         seltag[0] = True;
 178         /* style */
 179         dc.norm[ColBorder] = initcolor(NORMBORDERCOLOR);
 180         dc.norm[ColBG] = initcolor(NORMBGCOLOR);
 181         dc.norm[ColFG] = initcolor(NORMFGCOLOR);
 182         dc.sel[ColBorder] = initcolor(SELBORDERCOLOR);
 183         dc.sel[ColBG] = initcolor(SELBGCOLOR);
 184         dc.sel[ColFG] = initcolor(SELFGCOLOR);
 185         initfont(FONT);
 186         /* geometry */
 187         sx = sy = 0;
 188         sw = DisplayWidth(dpy, screen);
 189         sh = DisplayHeight(dpy, screen);
 190         initlayouts();
 191         /* bar */
 192         dc.h = bh = dc.font.height + 2;
 193         wa.override_redirect = 1;
 194         wa.background_pixmap = ParentRelative;
 195         wa.event_mask = ButtonPressMask | ExposureMask;
 196         barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
 197                         DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
 198                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 199         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 200         bpos = BARPOS;
 201         updatebarpos();
 202         XMapRaised(dpy, barwin);
 203         strcpy(stext, "dwm-"VERSION);
 204         /* pixmap for everything */
 205         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 206         dc.gc = XCreateGC(dpy, root, 0, 0);
 207         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 208         if(!dc.font.set)
 209                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 210         /* multihead support */
 211         selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 212 }
 213
 214 /*
 215  * Startup Error handler to check if another window manager
 216  * is already running.
 217  */
 218 static int
 219 xerrorstart(Display *dsply, XErrorEvent *ee) {
 220         otherwm = True;
 221         return -1;
 222 }
 223
 224 /* extern */
 225
 226 void
 227 quit(const char *arg) {
 228         readin = running = False;
 229 }
 230
 231 void
 232 updatebarpos(void) {
 233         XEvent ev;
 234
 235         wax = sx;
 236         way = sy;
 237         wah = sh;
 238         waw = sw;
 239         switch(bpos) {
 240         default:
 241                 wah -= bh;
 242                 way += bh;
 243                 XMoveWindow(dpy, barwin, sx, sy);
 244                 break;
 245         case BarBot:
 246                 wah -= bh;
 247                 XMoveWindow(dpy, barwin, sx, sy + wah);
 248                 break;
 249         case BarOff:
 250                 XMoveWindow(dpy, barwin, sx, sy - bh);
 251                 break;
 252         }
 253         XSync(dpy, False);
 254         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
 255 }
 256
 257 /* There's no way to check accesses to destroyed windows, thus those cases are
 258  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 259  * default error handler, which may call exit.
 260  */
 261 int
 262 xerror(Display *dpy, XErrorEvent *ee) {
 263         if(ee->error_code == BadWindow
 264         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 265         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 266         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
 267         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 268         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
 269         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
 270         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 271                 return 0;
 272         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 273                 ee->request_code, ee->error_code);
 274         return xerrorxlib(dpy, ee); /* may call exit */
 275 }
 276
 277 int
 278 main(int argc, char *argv[]) {
 279         char *p;
 280         int r, xfd;
 281         fd_set rd;
 282         XEvent ev;
 283
 284         if(argc == 2 && !strcmp("-v", argv[1]))
 285                 eprint("dwm-"VERSION", © 2006-2007 A. R. Garbe, S. van Dijk, J. Salmi, P. Hruby, S. Nagy\n");
 286         else if(argc != 1)
 287                 eprint("usage: dwm [-v]\n");
 288         setlocale(LC_CTYPE, "");
 289         if(!(dpy = XOpenDisplay(0)))
 290                 eprint("dwm: cannot open display\n");
 291         xfd = ConnectionNumber(dpy);
 292         screen = DefaultScreen(dpy);
 293         root = RootWindow(dpy, screen);
 294         otherwm = False;
 295         XSetErrorHandler(xerrorstart);
 296         /* this causes an error if some other window manager is running */
 297         XSelectInput(dpy, root, SubstructureRedirectMask);
 298         XSync(dpy, False);
 299         if(otherwm)
 300                 eprint("dwm: another window manager is already running\n");
 301
 302         XSync(dpy, False);
 303         XSetErrorHandler(NULL);
 304         xerrorxlib = XSetErrorHandler(xerror);
 305         XSync(dpy, False);
 306         setup();
 307         drawstatus();
 308         scan();
 309
 310         /* main event loop, also reads status text from stdin */
 311         XSync(dpy, False);
 312         readin = True;
 313         while(running) {
 314                 FD_ZERO(&rd);
 315                 if(readin)
 316                         FD_SET(STDIN_FILENO, &rd);
 317                 FD_SET(xfd, &rd);
 318                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
 319                         if(errno == EINTR)
 320                                 continue;
 321                         eprint("select failed\n");
 322                 }
 323                 if(FD_ISSET(STDIN_FILENO, &rd)) {
 324                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
 325                         case -1:
 326                                 strncpy(stext, strerror(errno), sizeof stext - 1);
 327                                 stext[sizeof stext - 1] = '\0';
 328                                 readin = False;
 329                                 break;
 330                         case 0:
 331                                 strncpy(stext, "EOF", 4);
 332                                 readin = False;
 333                                 break;
 334                         default:
 335                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
 336                                 for(; p >= stext && *p != '\n'; --p);
 337                                 if(p > stext)
 338                                         strncpy(stext, p + 1, sizeof stext);
 339                         }
 340                         drawstatus();
 341                 }
 342                 while(XPending(dpy)) {
 343                         XNextEvent(dpy, &ev);
 344                         if(handler[ev.type])
 345                                 (handler[ev.type])(&ev); /* call handler */
 346                 }
 347         }
 348         cleanup();
 349         XCloseDisplay(dpy);
 350         return 0;
 351 }