wm.c

   1 /*
   2  * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
   3  * See LICENSE file for license details.
   4  */
   5
   6 #include <errno.h>
   7
   8 #include <stdarg.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11
  12 #include <sys/types.h>
  13 #include <sys/time.h>
  14
  15 #include <X11/cursorfont.h>
  16 #include <X11/Xatom.h>
  17 #include <X11/Xproto.h>
  18
  19 #include "wm.h"
  20
  21 /* X structs */
  22 Display *dpy;
  23 Window root, barwin;
  24 Atom wm_atom[WMLast], net_atom[NetLast];
  25 Cursor cursor[CurLast];
  26 XRectangle rect, barrect;
  27 Bool running = True;
  28 Bool sel_screen;
  29
  30 char *bartext, tag[256];
  31 int screen;
  32
  33 Brush brush = {0};
  34 Client *clients = NULL;
  35 Client *stack = NULL;
  36
  37 static Bool other_wm_running;
  38 static char version[] = "gridwm - " VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
  39 static int (*x_error_handler) (Display *, XErrorEvent *);
  40
  41 static void
  42 usage()
  43 {
  44         fputs("usage: gridwm [-v]\n", stderr);
  45         exit(1);
  46 }
  47
  48 static void
  49 scan_wins()
  50 {
  51         unsigned int i, num;
  52         Window *wins;
  53         XWindowAttributes wa;
  54         Window d1, d2;
  55
  56         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  57                 for(i = 0; i < num; i++) {
  58                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
  59                                 continue;
  60                         if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
  61                                 continue;
  62                         if(wa.map_state == IsViewable)
  63                                 manage(wins[i], &wa);
  64                 }
  65         }
  66         if(wins)
  67                 XFree(wins);
  68 }
  69
  70 static int
  71 win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
  72 {
  73         Atom real;
  74         int format;
  75         unsigned long res, extra;
  76         int status;
  77
  78         status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
  79                         &res, &extra, prop);
  80
  81         if(status != Success || *prop == 0) {
  82                 return 0;
  83         }
  84         if(res == 0) {
  85                 free((void *) *prop);
  86         }
  87         return res;
  88 }
  89
  90 int
  91 win_proto(Window w)
  92 {
  93         Atom *protocols;
  94         long res;
  95         int protos = 0;
  96         int i;
  97
  98         res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L,
  99                         ((unsigned char **) &protocols));
 100         if(res <= 0) {
 101                 return protos;
 102         }
 103         for(i = 0; i < res; i++) {
 104                 if(protocols[i] == wm_atom[WMDelete])
 105                         protos |= WM_PROTOCOL_DELWIN;
 106         }
 107         free((char *) protocols);
 108         return protos;
 109 }
 110
 111 void
 112 send_message(Window w, Atom a, long value)
 113 {
 114         XEvent e;
 115
 116         e.type = ClientMessage;
 117         e.xclient.window = w;
 118         e.xclient.message_type = a;
 119         e.xclient.format = 32;
 120         e.xclient.data.l[0] = value;
 121         e.xclient.data.l[1] = CurrentTime;
 122         XSendEvent(dpy, w, False, NoEventMask, &e);
 123         XFlush(dpy);
 124 }
 125
 126 /*
 127  * There's no way to check accesses to destroyed windows, thus
 128  * those cases are ignored (especially on UnmapNotify's).
 129  * Other types of errors call Xlib's default error handler, which
 130  * calls exit().
 131  */
 132 int
 133 error_handler(Display *dpy, XErrorEvent *error)
 134 {
 135         if(error->error_code == BadWindow
 136                         || (error->request_code == X_SetInputFocus
 137                                 && error->error_code == BadMatch)
 138                         || (error->request_code == X_PolyText8
 139                                 && error->error_code == BadDrawable)
 140                         || (error->request_code == X_PolyFillRectangle
 141                                 && error->error_code == BadDrawable)
 142                         || (error->request_code == X_PolySegment
 143                                 && error->error_code == BadDrawable)
 144                         || (error->request_code == X_ConfigureWindow
 145                                 && error->error_code == BadMatch)
 146                         || (error->request_code == X_GrabKey
 147                                 && error->error_code == BadAccess))
 148                 return 0;
 149         fprintf(stderr, "gridwm: fatal error: request code=%d, error code=%d\n",
 150                         error->request_code, error->error_code);
 151         return x_error_handler(dpy, error); /* may call exit() */
 152 }
 153
 154 /*
 155  * Startup Error handler to check if another window manager
 156  * is already running.
 157  */
 158 static int
 159 startup_error_handler(Display *dpy, XErrorEvent *error)
 160 {
 161         other_wm_running = True;
 162         return -1;
 163 }
 164
 165 static void
 166 cleanup()
 167 {
 168         while(clients)
 169                 unmanage(clients);
 170         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 171 }
 172
 173 int
 174 main(int argc, char *argv[])
 175 {
 176         int i;
 177         XSetWindowAttributes wa;
 178         unsigned int mask;
 179         Window w;
 180         XEvent ev;
 181         fd_set fds;
 182         struct timeval t, timeout = {
 183                 .tv_usec = 0,
 184                 .tv_sec = STATUSDELAY,
 185         };
 186
 187         /* command line args */
 188         for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
 189                 switch (argv[i][1]) {
 190                 case 'v':
 191                         fprintf(stdout, "%s", version);
 192                         exit(0);
 193                         break;
 194                 default:
 195                         usage();
 196                         break;
 197                 }
 198         }
 199
 200         dpy = XOpenDisplay(0);
 201         if(!dpy)
 202                 error("gridwm: cannot connect X server\n");
 203
 204         screen = DefaultScreen(dpy);
 205         root = RootWindow(dpy, screen);
 206
 207         /* check if another WM is already running */
 208         other_wm_running = False;
 209         XSetErrorHandler(startup_error_handler);
 210         /* this causes an error if some other WM is running */
 211         XSelectInput(dpy, root, SubstructureRedirectMask);
 212         XFlush(dpy);
 213
 214         if(other_wm_running)
 215                 error("gridwm: another window manager is already running\n");
 216
 217         rect.x = rect.y = 0;
 218         rect.width = DisplayWidth(dpy, screen);
 219         rect.height = DisplayHeight(dpy, screen);
 220         sel_screen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 221
 222         XSetErrorHandler(0);
 223         x_error_handler = XSetErrorHandler(error_handler);
 224
 225         /* init atoms */
 226         wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 227         wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 228         net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 229         net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 230
 231         XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
 232                         PropModeReplace, (unsigned char *) net_atom, NetLast);
 233
 234
 235         /* init cursors */
 236         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 237         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 238         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 239
 240         update_keys();
 241
 242         brush.drawable = XCreatePixmap(dpy, root, rect.width, rect.height,
 243                         DefaultDepth(dpy, screen));
 244         brush.gc = XCreateGC(dpy, root, 0, 0);
 245
 246         /* style */
 247         loadcolors(dpy, screen, &brush, BGCOLOR, FGCOLOR, BORDERCOLOR);
 248         loadfont(dpy, &brush.font, FONT);
 249
 250         wa.override_redirect = 1;
 251         wa.background_pixmap = ParentRelative;
 252         wa.event_mask = ExposureMask;
 253
 254         barrect = rect;
 255         barrect.height = labelheight(&brush.font);
 256         barrect.y = rect.height - barrect.height;
 257         barwin = XCreateWindow(dpy, root, barrect.x, barrect.y,
 258                         barrect.width, barrect.height, 0, DefaultDepth(dpy, screen),
 259                         CopyFromParent, DefaultVisual(dpy, screen),
 260                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 261         bartext = NULL;
 262         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 263         XMapRaised(dpy, barwin);
 264         draw_bar();
 265
 266         wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
 267                                         | LeaveWindowMask;
 268         wa.cursor = cursor[CurNormal];
 269         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 270
 271         scan_wins();
 272
 273         while(running) {
 274                 if(XPending(dpy) > 0) {
 275                         XNextEvent(dpy, &ev);
 276                         if(handler[ev.type])
 277                                 (handler[ev.type]) (&ev); /* call handler */
 278                         continue;
 279                 }
 280                 FD_ZERO(&fds);
 281                 FD_SET(ConnectionNumber(dpy), &fds);
 282                 t = timeout;
 283                 if(select(ConnectionNumber(dpy) + 1, &fds, NULL, NULL, &t) > 0)
 284                         continue;
 285                 else if(errno != EINTR)
 286                         draw_bar();
 287         }
 288
 289         cleanup();
 290         XCloseDisplay(dpy);
 291
 292         return 0;
 293 }