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 Bool running = True;
  27 Bool sel_screen;
  28
  29 char statustext[1024], tag[256];
  30 int screen, sx, sy, sw, sh, bx, by, bw, bh;
  31
  32 Brush brush = {0};
  33 Client *clients = NULL;
  34 Client *stack = NULL;
  35
  36 static Bool other_wm_running;
  37 static const char version[] = "gridwm - " VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
  38 static int (*x_error_handler) (Display *, XErrorEvent *);
  39
  40 static const char *status[] = {
  41         "sh", "-c", "echo -n `date '+%Y-%m-%d %H:%M'`"
  42         " `uptime | sed 's/.*://; s/,//g'`"
  43         " `acpi | awk '{print $4}' | sed 's/,//'`", 0
  44 };
  45
  46 static void
  47 usage()
  48 {
  49         fputs("usage: gridwm [-v]\n", stderr);
  50         exit(1);
  51 }
  52
  53 static void
  54 scan_wins()
  55 {
  56         unsigned int i, num;
  57         Window *wins;
  58         XWindowAttributes wa;
  59         Window d1, d2;
  60
  61         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  62                 for(i = 0; i < num; i++) {
  63                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
  64                                 continue;
  65                         if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
  66                                 continue;
  67                         if(wa.map_state == IsViewable)
  68                                 manage(wins[i], &wa);
  69                 }
  70         }
  71         if(wins)
  72                 XFree(wins);
  73 }
  74
  75 static int
  76 win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
  77 {
  78         Atom real;
  79         int format;
  80         unsigned long res, extra;
  81         int status;
  82
  83         status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
  84                         &res, &extra, prop);
  85
  86         if(status != Success || *prop == 0) {
  87                 return 0;
  88         }
  89         if(res == 0) {
  90                 free((void *) *prop);
  91         }
  92         return res;
  93 }
  94
  95 int
  96 win_proto(Window w)
  97 {
  98         Atom *protocols;
  99         long res;
 100         int protos = 0;
 101         int i;
 102
 103         res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L,
 104                         ((unsigned char **) &protocols));
 105         if(res <= 0) {
 106                 return protos;
 107         }
 108         for(i = 0; i < res; i++) {
 109                 if(protocols[i] == wm_atom[WMDelete])
 110                         protos |= WM_PROTOCOL_DELWIN;
 111         }
 112         free((char *) protocols);
 113         return protos;
 114 }
 115
 116 void
 117 send_message(Window w, Atom a, long value)
 118 {
 119         XEvent e;
 120
 121         e.type = ClientMessage;
 122         e.xclient.window = w;
 123         e.xclient.message_type = a;
 124         e.xclient.format = 32;
 125         e.xclient.data.l[0] = value;
 126         e.xclient.data.l[1] = CurrentTime;
 127         XSendEvent(dpy, w, False, NoEventMask, &e);
 128         XFlush(dpy);
 129 }
 130
 131 /*
 132  * There's no way to check accesses to destroyed windows, thus
 133  * those cases are ignored (especially on UnmapNotify's).
 134  * Other types of errors call Xlib's default error handler, which
 135  * calls exit().
 136  */
 137 int
 138 error_handler(Display *dpy, XErrorEvent *error)
 139 {
 140         if(error->error_code == BadWindow
 141                         || (error->request_code == X_SetInputFocus
 142                                 && error->error_code == BadMatch)
 143                         || (error->request_code == X_PolyText8
 144                                 && error->error_code == BadDrawable)
 145                         || (error->request_code == X_PolyFillRectangle
 146                                 && error->error_code == BadDrawable)
 147                         || (error->request_code == X_PolySegment
 148                                 && error->error_code == BadDrawable)
 149                         || (error->request_code == X_ConfigureWindow
 150                                 && error->error_code == BadMatch)
 151                         || (error->request_code == X_GrabKey
 152                                 && error->error_code == BadAccess))
 153                 return 0;
 154         fprintf(stderr, "gridwm: fatal error: request code=%d, error code=%d\n",
 155                         error->request_code, error->error_code);
 156         return x_error_handler(dpy, error); /* may call exit() */
 157 }
 158
 159 /*
 160  * Startup Error handler to check if another window manager
 161  * is already running.
 162  */
 163 static int
 164 startup_error_handler(Display *dpy, XErrorEvent *error)
 165 {
 166         other_wm_running = True;
 167         return -1;
 168 }
 169
 170 static void
 171 cleanup()
 172 {
 173         while(clients)
 174                 unmanage(clients);
 175         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 176 }
 177
 178 int
 179 main(int argc, char *argv[])
 180 {
 181         int i;
 182         XSetWindowAttributes wa;
 183         unsigned int mask;
 184         Window w;
 185         XEvent ev;
 186         fd_set fds;
 187         struct timeval t, timeout = {
 188                 .tv_usec = 0,
 189                 .tv_sec = STATUSDELAY,
 190         };
 191
 192         /* command line args */
 193         for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
 194                 switch (argv[i][1]) {
 195                 case 'v':
 196                         fprintf(stdout, "%s", version);
 197                         exit(0);
 198                         break;
 199                 default:
 200                         usage();
 201                         break;
 202                 }
 203         }
 204
 205         dpy = XOpenDisplay(0);
 206         if(!dpy)
 207                 error("gridwm: cannot connect X server\n");
 208
 209         screen = DefaultScreen(dpy);
 210         root = RootWindow(dpy, screen);
 211
 212         /* check if another WM is already running */
 213         other_wm_running = False;
 214         XSetErrorHandler(startup_error_handler);
 215         /* this causes an error if some other WM is running */
 216         XSelectInput(dpy, root, SubstructureRedirectMask);
 217         XFlush(dpy);
 218
 219         if(other_wm_running)
 220                 error("gridwm: another window manager is already running\n");
 221
 222         sx = sy = 0;
 223         sw = DisplayWidth(dpy, screen);
 224         sh = DisplayHeight(dpy, screen);
 225         sel_screen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 226
 227         XSetErrorHandler(0);
 228         x_error_handler = XSetErrorHandler(error_handler);
 229
 230         /* init atoms */
 231         wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 232         wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 233         net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 234         net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 235
 236         XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
 237                         PropModeReplace, (unsigned char *) net_atom, NetLast);
 238
 239
 240         /* init cursors */
 241         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 242         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 243         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 244
 245         update_keys();
 246
 247         /* style */
 248         loadcolors(dpy, screen, &brush, BGCOLOR, FGCOLOR, BORDERCOLOR);
 249         loadfont(dpy, &brush.font, FONT);
 250
 251         wa.override_redirect = 1;
 252         wa.background_pixmap = ParentRelative;
 253         wa.event_mask = ExposureMask;
 254
 255         bx = by = 0;
 256         bw = sw;
 257         bh = texth(&brush.font);
 258         barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
 259                         CopyFromParent, DefaultVisual(dpy, screen),
 260                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 261         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 262         XMapRaised(dpy, barwin);
 263
 264         brush.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 265         brush.gc = XCreateGC(dpy, root, 0, 0);
 266
 267         pipe_spawn(statustext, sizeof(statustext), dpy, (char **)status);
 268         draw_bar();
 269
 270         wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
 271                                         | LeaveWindowMask;
 272         wa.cursor = cursor[CurNormal];
 273         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 274
 275         scan_wins();
 276
 277         while(running) {
 278                 if(XPending(dpy) > 0) {
 279                         XNextEvent(dpy, &ev);
 280                         if(handler[ev.type])
 281                                 (handler[ev.type]) (&ev); /* call handler */
 282                         continue;
 283                 }
 284                 FD_ZERO(&fds);
 285                 FD_SET(ConnectionNumber(dpy), &fds);
 286                 t = timeout;
 287                 if(select(ConnectionNumber(dpy) + 1, &fds, NULL, NULL, &t) > 0)
 288                         continue;
 289                 else if(errno != EINTR) {
 290                         pipe_spawn(statustext, sizeof(statustext), dpy, (char **)status);
 291                         draw_bar();
 292                 }
 293         }
 294
 295         cleanup();
 296         XCloseDisplay(dpy);
 297
 298         return 0;
 299 }