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  * © 2007 Premysl Hruby <dfenze at gmail dot com>
   4  * © 2007 Szabolcs Nagy <nszabolcs at gmail dot com>
   5  * See LICENSE file for license details. */
   6 #include "dwm.h"
   7 #include <errno.h>
   8 #include <locale.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <sys/select.h>
  14 #include <X11/cursorfont.h>
  15 #include <X11/keysym.h>
  16 #include <X11/Xatom.h>
  17 #include <X11/Xproto.h>
  18
  19 /* extern */
  20
  21 char stext[256];
  22 int screen, sx, sy, sw, sh, wax, way, waw, wah;
  23 unsigned int bh, bpos, ntags, numlockmask;
  24 Atom wmatom[WMLast], netatom[NetLast];
  25 Bool *seltag;
  26 Bool selscreen = True;
  27 Client *clients = NULL;
  28 Client *sel = NULL;
  29 Client *stack = NULL;
  30 Cursor cursor[CurLast];
  31 Display *dpy;
  32 DC dc = {0};
  33 Window root, barwin;
  34
  35 /* static */
  36
  37 static int (*xerrorxlib)(Display *, XErrorEvent *);
  38 static Bool otherwm, readin;
  39 static Bool running = True;
  40
  41 static void
  42 cleanup(void) {
  43         close(STDIN_FILENO);
  44         while(stack) {
  45                 if(stack->isbanned)
  46                         XMoveWindow(dpy, stack->win, stack->x, stack->y);
  47                 unmanage(stack);
  48         }
  49         if(dc.font.set)
  50                 XFreeFontSet(dpy, dc.font.set);
  51         else
  52                 XFreeFont(dpy, dc.font.xfont);
  53         XUngrabKey(dpy, AnyKey, AnyModifier, root);
  54         XFreePixmap(dpy, dc.drawable);
  55         XFreeGC(dpy, dc.gc);
  56         XDestroyWindow(dpy, barwin);
  57         XFreeCursor(dpy, cursor[CurNormal]);
  58         XFreeCursor(dpy, cursor[CurResize]);
  59         XFreeCursor(dpy, cursor[CurMove]);
  60         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
  61         XSync(dpy, False);
  62         free(seltag);
  63 }
  64
  65 static unsigned long
  66 initcolor(const char *colstr) {
  67         Colormap cmap = DefaultColormap(dpy, screen);
  68         XColor color;
  69
  70         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
  71                 eprint("error, cannot allocate color '%s'\n", colstr);
  72         return color.pixel;
  73 }
  74
  75 static void
  76 initfont(const char *fontstr) {
  77         char *def, **missing;
  78         int i, n;
  79
  80         missing = NULL;
  81         if(dc.font.set)
  82                 XFreeFontSet(dpy, dc.font.set);
  83         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
  84         if(missing) {
  85                 while(n--)
  86                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
  87                 XFreeStringList(missing);
  88         }
  89         if(dc.font.set) {
  90                 XFontSetExtents *font_extents;
  91                 XFontStruct **xfonts;
  92                 char **font_names;
  93                 dc.font.ascent = dc.font.descent = 0;
  94                 font_extents = XExtentsOfFontSet(dc.font.set);
  95                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
  96                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
  97                         if(dc.font.ascent < (*xfonts)->ascent)
  98                                 dc.font.ascent = (*xfonts)->ascent;
  99                         if(dc.font.descent < (*xfonts)->descent)
 100                                 dc.font.descent = (*xfonts)->descent;
 101                         xfonts++;
 102                 }
 103         }
 104         else {
 105                 if(dc.font.xfont)
 106                         XFreeFont(dpy, dc.font.xfont);
 107                 dc.font.xfont = NULL;
 108                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
 109                         eprint("error, cannot load font: '%s'\n", fontstr);
 110                 dc.font.ascent = dc.font.xfont->ascent;
 111                 dc.font.descent = dc.font.xfont->descent;
 112         }
 113         dc.font.height = dc.font.ascent + dc.font.descent;
 114 }
 115
 116 static void
 117 scan(void) {
 118         unsigned int i, num;
 119         Window *wins, d1, d2;
 120         XWindowAttributes wa;
 121
 122         wins = NULL;
 123         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 124                 for(i = 0; i < num; i++) {
 125                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
 126                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 127                                 continue;
 128                         if(wa.map_state == IsViewable)
 129                                 manage(wins[i], &wa);
 130                 }
 131         }
 132         if(wins)
 133                 XFree(wins);
 134 }
 135
 136 static void
 137 setup(void) {
 138         int i, j;
 139         unsigned int mask;
 140         Window w;
 141         XModifierKeymap *modmap;
 142         XSetWindowAttributes wa;
 143
 144         /* init atoms */
 145         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 146         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 147         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 148         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 149         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 150         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 151                         PropModeReplace, (unsigned char *) netatom, NetLast);
 152         /* init cursors */
 153         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 154         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 155         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 156         /* init modifier map */
 157         numlockmask = 0;
 158         modmap = XGetModifierMapping(dpy);
 159         for (i = 0; i < 8; i++)
 160                 for (j = 0; j < modmap->max_keypermod; j++) {
 161                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 162                                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 163                                 numlockmask = (1 << i);
 164                 }
 165         XFreeModifiermap(modmap);
 166         /* select for events */
 167         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 168                 | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 169         wa.cursor = cursor[CurNormal];
 170         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 171         XSelectInput(dpy, root, wa.event_mask);
 172         grabkeys();
 173         compileregs();
 174         for(ntags = 0; tags[ntags]; ntags++);
 175         seltag = emallocz(sizeof(Bool) * ntags);
 176         seltag[0] = True;
 177         /* style */
 178         dc.norm[ColBorder] = initcolor(NORMBORDERCOLOR);
 179         dc.norm[ColBG] = initcolor(NORMBGCOLOR);
 180         dc.norm[ColFG] = initcolor(NORMFGCOLOR);
 181         dc.sel[ColBorder] = initcolor(SELBORDERCOLOR);
 182         dc.sel[ColBG] = initcolor(SELBGCOLOR);
 183         dc.sel[ColFG] = initcolor(SELFGCOLOR);
 184         initfont(FONT);
 185         /* geometry */
 186         sx = sy = 0;
 187         sw = DisplayWidth(dpy, screen);
 188         sh = DisplayHeight(dpy, screen);
 189         initlayouts();
 190         /* bar */
 191         dc.h = bh = dc.font.height + 2;
 192         wa.override_redirect = 1;
 193         wa.background_pixmap = ParentRelative;
 194         wa.event_mask = ButtonPressMask | ExposureMask;
 195         barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
 196                         DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
 197                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 198         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 199         bpos = BARPOS;
 200         updatebarpos();
 201         XMapRaised(dpy, barwin);
 202         strcpy(stext, "dwm-"VERSION);
 203         /* pixmap for everything */
 204         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 205         dc.gc = XCreateGC(dpy, root, 0, 0);
 206         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 207         if(!dc.font.set)
 208                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 209         /* multihead support */
 210         selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 211 }
 212
 213 /*
 214  * Startup Error handler to check if another window manager
 215  * is already running.
 216  */
 217 static int
 218 xerrorstart(Display *dsply, XErrorEvent *ee) {
 219         otherwm = True;
 220         return -1;
 221 }
 222
 223 /* extern */
 224
 225 void
 226 quit(const char *arg) {
 227         readin = running = False;
 228 }
 229
 230 void
 231 updatebarpos(void) {
 232         XEvent ev;
 233
 234         wax = sx;
 235         way = sy;
 236         wah = sh;
 237         waw = sw;
 238         switch(bpos) {
 239         default:
 240                 wah -= bh;
 241                 way += bh;
 242                 XMoveWindow(dpy, barwin, sx, sy);
 243                 break;
 244         case BarBot:
 245                 wah -= bh;
 246                 XMoveWindow(dpy, barwin, sx, sy + wah);
 247                 break;
 248         case BarOff:
 249                 XMoveWindow(dpy, barwin, sx, sy - bh);
 250                 break;
 251         }
 252         XSync(dpy, False);
 253         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
 254 }
 255
 256 /* There's no way to check accesses to destroyed windows, thus those cases are
 257  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 258  * default error handler, which may call exit.
 259  */
 260 int
 261 xerror(Display *dpy, XErrorEvent *ee) {
 262         if(ee->error_code == BadWindow
 263         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 264         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 265         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
 266         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 267         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
 268         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
 269         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 270                 return 0;
 271         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 272                 ee->request_code, ee->error_code);
 273         return xerrorxlib(dpy, ee); /* may call exit */
 274 }
 275
 276 int
 277 main(int argc, char *argv[]) {
 278         char *p;
 279         int r, xfd;
 280         fd_set rd;
 281         XEvent ev;
 282
 283         if(argc == 2 && !strcmp("-v", argv[1]))
 284                 eprint("dwm-"VERSION", © 2004-2007 Anselm R. Garbe, Sander van Dijk, Premysl Hruby, Szabolcs Nagy\n");
 285         else if(argc != 1)
 286                 eprint("usage: dwm [-v]\n");
 287         setlocale(LC_CTYPE, "");
 288         if(!(dpy = XOpenDisplay(0)))
 289                 eprint("dwm: cannot open display\n");
 290         xfd = ConnectionNumber(dpy);
 291         screen = DefaultScreen(dpy);
 292         root = RootWindow(dpy, screen);
 293         otherwm = False;
 294         XSetErrorHandler(xerrorstart);
 295         /* this causes an error if some other window manager is running */
 296         XSelectInput(dpy, root, SubstructureRedirectMask);
 297         XSync(dpy, False);
 298         if(otherwm)
 299                 eprint("dwm: another window manager is already running\n");
 300
 301         XSync(dpy, False);
 302         XSetErrorHandler(NULL);
 303         xerrorxlib = XSetErrorHandler(xerror);
 304         XSync(dpy, False);
 305         setup();
 306         drawstatus();
 307         scan();
 308
 309         /* main event loop, also reads status text from stdin */
 310         XSync(dpy, False);
 311         readin = True;
 312         while(running) {
 313                 FD_ZERO(&rd);
 314                 if(readin)
 315                         FD_SET(STDIN_FILENO, &rd);
 316                 FD_SET(xfd, &rd);
 317                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
 318                         if(errno == EINTR)
 319                                 continue;
 320                         eprint("select failed\n");
 321                 }
 322                 if(FD_ISSET(STDIN_FILENO, &rd)) {
 323                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
 324                         case -1:
 325                                 strncpy(stext, strerror(errno), sizeof stext - 1);
 326                                 stext[sizeof stext - 1] = '\0';
 327                                 readin = False;
 328                                 break;
 329                         case 0:
 330                                 strncpy(stext, "EOF", 4);
 331                                 readin = False;
 332                                 break;
 333                         default:
 334                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
 335                                 for(; p >= stext && *p != '\n'; --p);
 336                                 if(p > stext)
 337                                         strncpy(stext, p + 1, sizeof stext);
 338                         }
 339                         drawstatus();
 340                 }
 341                 while(XPending(dpy)) {
 342                         XNextEvent(dpy, &ev);
 343                         if(handler[ev.type])
 344                                 (handler[ev.type])(&ev); /* call handler */
 345                 }
 346         }
 347         cleanup();
 348         XCloseDisplay(dpy);
 349         return 0;
 350 }