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 /********** CUSTOMIZE **********/
  22
  23 char *tags[TLast] = {
  24         [Tscratch] = "scratch",
  25         [Tdev] = "dev",
  26         [Tirc] = "irc",
  27         [Twww] = "www",
  28         [Twork] = "work",
  29 };
  30
  31 /* commands */
  32 static char *cmdwallpaper[] = {
  33         "feh", "--bg-scale", "/home/garbeam/wallpaper/bg.jpg", NULL
  34 };
  35
  36 static char *cmdstatus[] = {
  37         "sh", "-c", "echo -n `date '+%Y-%m-%d %H:%M'`"
  38         " `uptime | sed 's/.*://; s/,//g'`"
  39         " `acpi | awk '{print $4}' | sed 's/,//'`", NULL
  40 };
  41
  42 /********** CUSTOMIZE **********/
  43
  44 /* X structs */
  45 Display *dpy;
  46 Window root, barwin;
  47 Atom wm_atom[WMLast], net_atom[NetLast];
  48 Cursor cursor[CurLast];
  49 Bool running = True;
  50 Bool issel;
  51
  52 char stext[1024];
  53 int tsel = Tdev; /* default tag */
  54 int screen, sx, sy, sw, sh, bx, by, bw, bh;
  55
  56 Brush brush = {0};
  57 Client *clients = NULL;
  58 Client *stack = NULL;
  59
  60 static Bool other_wm_running;
  61 static const char version[] =
  62         "gridwm - " VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
  63 static int (*x_error_handler) (Display *, XErrorEvent *);
  64
  65 static void
  66 usage() {       error("usage: gridwm [-v]\n"); }
  67
  68 static void
  69 scan_wins()
  70 {
  71         unsigned int i, num;
  72         Window *wins;
  73         XWindowAttributes wa;
  74         Window d1, d2;
  75
  76         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  77                 for(i = 0; i < num; i++) {
  78                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
  79                                 continue;
  80                         if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
  81                                 continue;
  82                         if(wa.map_state == IsViewable)
  83                                 manage(wins[i], &wa);
  84                 }
  85         }
  86         if(wins)
  87                 XFree(wins);
  88 }
  89
  90 static int
  91 win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
  92 {
  93         Atom real;
  94         int format;
  95         unsigned long res, extra;
  96         int status;
  97
  98         status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
  99                         &res, &extra, prop);
 100
 101         if(status != Success || *prop == 0) {
 102                 return 0;
 103         }
 104         if(res == 0) {
 105                 free((void *) *prop);
 106         }
 107         return res;
 108 }
 109
 110 int
 111 win_proto(Window w)
 112 {
 113         unsigned char *protocols;
 114         long res;
 115         int protos = 0;
 116         int i;
 117
 118         res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L, &protocols);
 119         if(res <= 0) {
 120                 return protos;
 121         }
 122         for(i = 0; i < res; i++) {
 123                 if(protocols[i] == wm_atom[WMDelete])
 124                         protos |= WM_PROTOCOL_DELWIN;
 125         }
 126         free((char *) protocols);
 127         return protos;
 128 }
 129
 130 void
 131 send_message(Window w, Atom a, long value)
 132 {
 133         XEvent e;
 134
 135         e.type = ClientMessage;
 136         e.xclient.window = w;
 137         e.xclient.message_type = a;
 138         e.xclient.format = 32;
 139         e.xclient.data.l[0] = value;
 140         e.xclient.data.l[1] = CurrentTime;
 141         XSendEvent(dpy, w, False, NoEventMask, &e);
 142         XFlush(dpy);
 143 }
 144
 145 /*
 146  * There's no way to check accesses to destroyed windows, thus
 147  * those cases are ignored (especially on UnmapNotify's).
 148  * Other types of errors call Xlib's default error handler, which
 149  * calls exit().
 150  */
 151 int
 152 error_handler(Display *dpy, XErrorEvent *error)
 153 {
 154         if(error->error_code == BadWindow
 155                         || (error->request_code == X_SetInputFocus
 156                                 && error->error_code == BadMatch)
 157                         || (error->request_code == X_PolyText8
 158                                 && error->error_code == BadDrawable)
 159                         || (error->request_code == X_PolyFillRectangle
 160                                 && error->error_code == BadDrawable)
 161                         || (error->request_code == X_PolySegment
 162                                 && error->error_code == BadDrawable)
 163                         || (error->request_code == X_ConfigureWindow
 164                                 && error->error_code == BadMatch)
 165                         || (error->request_code == X_GrabKey
 166                                 && error->error_code == BadAccess))
 167                 return 0;
 168         fprintf(stderr, "gridwm: fatal error: request code=%d, error code=%d\n",
 169                         error->request_code, error->error_code);
 170         return x_error_handler(dpy, error); /* may call exit() */
 171 }
 172
 173 /*
 174  * Startup Error handler to check if another window manager
 175  * is already running.
 176  */
 177 static int
 178 startup_error_handler(Display *dpy, XErrorEvent *error)
 179 {
 180         other_wm_running = True;
 181         return -1;
 182 }
 183
 184 static void
 185 cleanup()
 186 {
 187         while(clients)
 188                 unmanage(clients);
 189         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 190 }
 191
 192 void
 193 run(void *aux)
 194 {
 195         spawn(dpy, aux);
 196 }
 197
 198 void
 199 quit(void *aux)
 200 {
 201         running = False;
 202 }
 203
 204 int
 205 main(int argc, char *argv[])
 206 {
 207         int i;
 208         XSetWindowAttributes wa;
 209         unsigned int mask;
 210         Window w;
 211         XEvent ev;
 212         fd_set fds;
 213         struct timeval t, timeout = {
 214                 .tv_usec = 0,
 215                 .tv_sec = STATUSDELAY,
 216         };
 217
 218         /* command line args */
 219         for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
 220                 switch (argv[i][1]) {
 221                 case 'v':
 222                         fprintf(stdout, "%s", version);
 223                         exit(0);
 224                         break;
 225                 default:
 226                         usage();
 227                         break;
 228                 }
 229         }
 230
 231         dpy = XOpenDisplay(0);
 232         if(!dpy)
 233                 error("gridwm: cannot connect X server\n");
 234
 235         screen = DefaultScreen(dpy);
 236         root = RootWindow(dpy, screen);
 237
 238         /* check if another WM is already running */
 239         other_wm_running = False;
 240         XSetErrorHandler(startup_error_handler);
 241         /* this causes an error if some other WM is running */
 242         XSelectInput(dpy, root, SubstructureRedirectMask);
 243         XFlush(dpy);
 244
 245         if(other_wm_running)
 246                 error("gridwm: another window manager is already running\n");
 247
 248         spawn(dpy, cmdwallpaper);
 249         sx = sy = 0;
 250         sw = DisplayWidth(dpy, screen);
 251         sh = DisplayHeight(dpy, screen);
 252         issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 253
 254         XSetErrorHandler(0);
 255         x_error_handler = XSetErrorHandler(error_handler);
 256
 257         /* init atoms */
 258         wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 259         wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 260         net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 261         net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 262
 263         XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
 264                         PropModeReplace, (unsigned char *) net_atom, NetLast);
 265
 266
 267         /* init cursors */
 268         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 269         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 270         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 271
 272         update_keys();
 273
 274         /* style */
 275         loadcolors(dpy, screen, &brush, BGCOLOR, FGCOLOR, BORDERCOLOR);
 276         loadfont(dpy, &brush.font, FONT);
 277
 278         wa.override_redirect = 1;
 279         wa.background_pixmap = ParentRelative;
 280         wa.event_mask = ExposureMask;
 281
 282         bx = by = 0;
 283         bw = sw;
 284         bh = texth(&brush.font);
 285         barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
 286                         CopyFromParent, DefaultVisual(dpy, screen),
 287                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 288         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 289         XMapRaised(dpy, barwin);
 290
 291         brush.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 292         brush.gc = XCreateGC(dpy, root, 0, 0);
 293
 294         pipe_spawn(stext, sizeof(stext), dpy, cmdstatus);
 295         draw_bar();
 296
 297         wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
 298                                         | LeaveWindowMask;
 299         wa.cursor = cursor[CurNormal];
 300         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 301
 302         arrange = grid;
 303         scan_wins();
 304
 305         while(running) {
 306                 if(XPending(dpy) > 0) {
 307                         XNextEvent(dpy, &ev);
 308                         if(handler[ev.type])
 309                                 (handler[ev.type]) (&ev); /* call handler */
 310                         continue;
 311                 }
 312                 FD_ZERO(&fds);
 313                 FD_SET(ConnectionNumber(dpy), &fds);
 314                 t = timeout;
 315                 if(select(ConnectionNumber(dpy) + 1, &fds, NULL, NULL, &t) > 0)
 316                         continue;
 317                 else if(errno != EINTR) {
 318                         pipe_spawn(stext, sizeof(stext), dpy, cmdstatus);
 319                         draw_bar();
 320                 }
 321         }
 322
 323         cleanup();
 324         XCloseDisplay(dpy);
 325
 326         return 0;
 327 }