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