main.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include "dwm.h"
   3 #include <errno.h>
   4 #include <locale.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <unistd.h>
   9 #include <sys/select.h>
  10 #include <X11/cursorfont.h>
  11 #include <X11/keysym.h>
  12 #include <X11/Xatom.h>
  13 #include <X11/Xproto.h>
  14 #include <X11/Xutil.h>
  15
  16 /* extern */
  17
  18 char stext[256];
  19 int screen, sx, sy, sw, sh, wax, way, waw, wah;
  20 unsigned int bh, ntags;
  21 unsigned int bpos = BARPOS;
  22 unsigned int numlockmask = 0;
  23 Atom dwmprops, wmatom[WMLast], netatom[NetLast];
  24 Bool *seltags;
  25 Bool selscreen = True;
  26 Client *clients = NULL;
  27 Client *sel = NULL;
  28 Client *stack = NULL;
  29 Cursor cursor[CurLast];
  30 Display *dpy;
  31 DC dc = {0};
  32 Window root, barwin;
  33
  34 /* static */
  35
  36 static int (*xerrorxlib)(Display *, XErrorEvent *);
  37 static Bool otherwm, readin;
  38 static Bool running = True;
  39
  40 static void
  41 cleanup(void) {
  42         close(STDIN_FILENO);
  43         while(stack) {
  44                 unban(stack);
  45                 unmanage(stack, NormalState);
  46         }
  47         if(dc.font.set)
  48                 XFreeFontSet(dpy, dc.font.set);
  49         else
  50                 XFreeFont(dpy, dc.font.xfont);
  51         XUngrabKey(dpy, AnyKey, AnyModifier, root);
  52         XFreePixmap(dpy, dc.drawable);
  53         XFreeGC(dpy, dc.gc);
  54         XDestroyWindow(dpy, barwin);
  55         XFreeCursor(dpy, cursor[CurNormal]);
  56         XFreeCursor(dpy, cursor[CurResize]);
  57         XFreeCursor(dpy, cursor[CurMove]);
  58         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
  59         XSync(dpy, False);
  60         free(seltags);
  61 }
  62
  63 static unsigned long
  64 initcolor(const char *colstr) {
  65         Colormap cmap = DefaultColormap(dpy, screen);
  66         XColor color;
  67
  68         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
  69                 eprint("error, cannot allocate color '%s'\n", colstr);
  70         return color.pixel;
  71 }
  72
  73 static void
  74 initfont(const char *fontstr) {
  75         char *def, **missing;
  76         int i, n;
  77
  78         missing = NULL;
  79         if(dc.font.set)
  80                 XFreeFontSet(dpy, dc.font.set);
  81         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
  82         if(missing) {
  83                 while(n--)
  84                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
  85                 XFreeStringList(missing);
  86         }
  87         if(dc.font.set) {
  88                 XFontSetExtents *font_extents;
  89                 XFontStruct **xfonts;
  90                 char **font_names;
  91                 dc.font.ascent = dc.font.descent = 0;
  92                 font_extents = XExtentsOfFontSet(dc.font.set);
  93                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
  94                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
  95                         if(dc.font.ascent < (*xfonts)->ascent)
  96                                 dc.font.ascent = (*xfonts)->ascent;
  97                         if(dc.font.descent < (*xfonts)->descent)
  98                                 dc.font.descent = (*xfonts)->descent;
  99                         xfonts++;
 100                 }
 101         }
 102         else {
 103                 if(dc.font.xfont)
 104                         XFreeFont(dpy, dc.font.xfont);
 105                 dc.font.xfont = NULL;
 106                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
 107                         eprint("error, cannot load font: '%s'\n", fontstr);
 108                 dc.font.ascent = dc.font.xfont->ascent;
 109                 dc.font.descent = dc.font.xfont->descent;
 110         }
 111         dc.font.height = dc.font.ascent + dc.font.descent;
 112 }
 113
 114 static void
 115 scan(void) {
 116         unsigned int i, num;
 117         Window *wins, d1, d2;
 118         XWindowAttributes wa;
 119
 120         wins = NULL;
 121         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 122                 for(i = 0; i < num; i++) {
 123                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
 124                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 125                                 continue;
 126                         if(wa.map_state == IsViewable)
 127                                 manage(wins[i], &wa);
 128                 }
 129         }
 130         if(wins)
 131                 XFree(wins);
 132 }
 133
 134 static void
 135 setup(void) {
 136         int i, j;
 137         unsigned int mask;
 138         Window w;
 139         XModifierKeymap *modmap;
 140         XSetWindowAttributes wa;
 141
 142         /* init atoms */
 143         dwmprops = XInternAtom(dpy, "_DWM_PROPERTIES", False);
 144         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 145         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 146         wmatom[WMName] = XInternAtom(dpy, "WM_NAME", 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         modmap = XGetModifierMapping(dpy);
 158         for (i = 0; i < 8; i++)
 159                 for (j = 0; j < modmap->max_keypermod; j++) {
 160                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 161                                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 162                                 numlockmask = (1 << i);
 163                 }
 164         XFreeModifiermap(modmap);
 165         /* select for events */
 166         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 167                 | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 168         wa.cursor = cursor[CurNormal];
 169         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 170         XSelectInput(dpy, root, wa.event_mask);
 171         grabkeys();
 172         compileregs();
 173         for(ntags = 0; tags[ntags]; ntags++);
 174         seltags = emallocz(sizeof(Bool) * ntags);
 175         seltags[0] = True;
 176         /* style */
 177         dc.norm[ColBorder] = initcolor(NORMBORDERCOLOR);
 178         dc.norm[ColBG] = initcolor(NORMBGCOLOR);
 179         dc.norm[ColFG] = initcolor(NORMFGCOLOR);
 180         dc.sel[ColBorder] = initcolor(SELBORDERCOLOR);
 181         dc.sel[ColBG] = initcolor(SELBGCOLOR);
 182         dc.sel[ColFG] = initcolor(SELFGCOLOR);
 183         initfont(FONT);
 184         /* geometry */
 185         sx = sy = 0;
 186         sw = DisplayWidth(dpy, screen);
 187         sh = DisplayHeight(dpy, screen);
 188         initlayouts();
 189         /* bar */
 190         dc.h = bh = dc.font.height + 2;
 191         wa.override_redirect = 1;
 192         wa.background_pixmap = ParentRelative;
 193         wa.event_mask = ButtonPressMask | ExposureMask;
 194         barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
 195                         DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
 196                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 197         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 198         updatebarpos();
 199         XMapRaised(dpy, barwin);
 200         strcpy(stext, "dwm-"VERSION);
 201         /* pixmap for everything */
 202         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 203         dc.gc = XCreateGC(dpy, root, 0, 0);
 204         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 205         if(!dc.font.set)
 206                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 207         /* multihead support */
 208         selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 209         loaddwmprops();
 210 }
 211
 212 /*
 213  * Startup Error handler to check if another window manager
 214  * is already running.
 215  */
 216 static int
 217 xerrorstart(Display *dsply, XErrorEvent *ee) {
 218         otherwm = True;
 219         return -1;
 220 }
 221
 222 /* extern */
 223
 224 Bool
 225 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 226         char **list = NULL;
 227         int n;
 228         XTextProperty name;
 229
 230         if(!text || size == 0)
 231                 return False;
 232         text[0] = '\0';
 233         XGetTextProperty(dpy, w, &name, atom);
 234         if(!name.nitems)
 235                 return False;
 236         if(name.encoding == XA_STRING)
 237                 strncpy(text, (char *)name.value, size - 1);
 238         else {
 239                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
 240                 && n > 0 && *list)
 241                 {
 242                         strncpy(text, *list, size - 1);
 243                         XFreeStringList(list);
 244                 }
 245         }
 246         text[size - 1] = '\0';
 247         XFree(name.value);
 248         return True;
 249 }
 250
 251 void
 252 quit(const char *arg) {
 253         readin = running = False;
 254 }
 255
 256 void
 257 updatebarpos(void) {
 258         XEvent ev;
 259
 260         wax = sx;
 261         way = sy;
 262         wah = sh;
 263         waw = sw;
 264         switch(bpos) {
 265         default:
 266                 wah -= bh;
 267                 way += bh;
 268                 XMoveWindow(dpy, barwin, sx, sy);
 269                 break;
 270         case BarBot:
 271                 wah -= bh;
 272                 XMoveWindow(dpy, barwin, sx, sy + wah);
 273                 break;
 274         case BarOff:
 275                 XMoveWindow(dpy, barwin, sx, sy - bh);
 276                 break;
 277         }
 278         XSync(dpy, False);
 279         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
 280 }
 281
 282 /* There's no way to check accesses to destroyed windows, thus those cases are
 283  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 284  * default error handler, which may call exit.
 285  */
 286 int
 287 xerror(Display *dpy, XErrorEvent *ee) {
 288         if(ee->error_code == BadWindow
 289         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 290         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 291         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
 292         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 293         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
 294         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
 295         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 296                 return 0;
 297         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 298                 ee->request_code, ee->error_code);
 299         return xerrorxlib(dpy, ee); /* may call exit */
 300 }
 301
 302 int
 303 main(int argc, char *argv[]) {
 304         char *p;
 305         int r, xfd;
 306         fd_set rd;
 307         XEvent ev;
 308
 309         if(argc == 2 && !strcmp("-v", argv[1]))
 310                 eprint("dwm-"VERSION", © 2006-2007 A. R. Garbe, S. van Dijk, J. Salmi, P. Hruby, S. Nagy\n");
 311         else if(argc != 1)
 312                 eprint("usage: dwm [-v]\n");
 313         setlocale(LC_CTYPE, "");
 314         if(!(dpy = XOpenDisplay(0)))
 315                 eprint("dwm: cannot open display\n");
 316         xfd = ConnectionNumber(dpy);
 317         screen = DefaultScreen(dpy);
 318         root = RootWindow(dpy, screen);
 319         otherwm = False;
 320         XSetErrorHandler(xerrorstart);
 321         /* this causes an error if some other window manager is running */
 322         XSelectInput(dpy, root, SubstructureRedirectMask);
 323         XSync(dpy, False);
 324         if(otherwm)
 325                 eprint("dwm: another window manager is already running\n");
 326
 327         XSync(dpy, False);
 328         XSetErrorHandler(NULL);
 329         xerrorxlib = XSetErrorHandler(xerror);
 330         XSync(dpy, False);
 331         setup();
 332         drawstatus();
 333         scan();
 334
 335         /* main event loop, also reads status text from stdin */
 336         XSync(dpy, False);
 337         readin = True;
 338         while(running) {
 339                 FD_ZERO(&rd);
 340                 if(readin)
 341                         FD_SET(STDIN_FILENO, &rd);
 342                 FD_SET(xfd, &rd);
 343                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
 344                         if(errno == EINTR)
 345                                 continue;
 346                         eprint("select failed\n");
 347                 }
 348                 if(FD_ISSET(STDIN_FILENO, &rd)) {
 349                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
 350                         case -1:
 351                                 strncpy(stext, strerror(errno), sizeof stext - 1);
 352                                 stext[sizeof stext - 1] = '\0';
 353                                 readin = False;
 354                                 break;
 355                         case 0:
 356                                 strncpy(stext, "EOF", 4);
 357                                 readin = False;
 358                                 break;
 359                         default:
 360                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
 361                                 for(; p >= stext && *p != '\n'; --p);
 362                                 if(p > stext)
 363                                         strncpy(stext, p + 1, sizeof stext);
 364                         }
 365                         drawstatus();
 366                 }
 367                 while(XPending(dpy)) {
 368                         XNextEvent(dpy, &ev);
 369                         if(handler[ev.type])
 370                                 (handler[ev.type])(&ev); /* call handler */
 371                 }
 372         }
 373         cleanup();
 374         XCloseDisplay(dpy);
 375         return 0;
 376 }