main.c

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