main.c

   1 /* © 2006-2007 Anselm R. Garbe <garbeam at gmail dot com>
   2  * © 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
   3  * See LICENSE file for license details. */
   4 #include "dwm.h"
   5 #include <errno.h>
   6 #include <locale.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <unistd.h>
  11 #include <sys/select.h>
  12 #include <X11/cursorfont.h>
  13 #include <X11/keysym.h>
  14 #include <X11/Xatom.h>
  15 #include <X11/Xproto.h>
  16
  17 /* extern */
  18
  19 char stext[256];
  20 int screen, sx, sy, sw, sh, wax, way, waw, wah;
  21 unsigned int bh, ntags, numlockmask;
  22 Atom wmatom[WMLast], netatom[NetLast];
  23 Bool *seltag;
  24 Bool selscreen = True;
  25 Client *clients = NULL;
  26 Client *sel = NULL;
  27 Client *stack = NULL;
  28 Cursor cursor[CurLast];
  29 Display *dpy;
  30 DC dc = {0};
  31 Window root, barwin;
  32
  33 /* static */
  34
  35 static int (*xerrorxlib)(Display *, XErrorEvent *);
  36 static Bool otherwm, readin;
  37 static Bool running = True;
  38
  39 static void
  40 cleanup(void) {
  41         close(STDIN_FILENO);
  42         while(stack) {
  43                 if(stack->isbanned)
  44                         XMoveWindow(dpy, stack->win, stack->x, stack->y);
  45                 unmanage(stack);
  46         }
  47         if(dc.font.set)
  48                 XFreeFontSet(dpy, dc.font.set);
  49         else
  50                 XFreeFont(dpy, dc.font.xfont);
  51         XUngrabKey(dpy, AnyKey, AnyModifier, root);
  52         XFreePixmap(dpy, dc.drawable);
  53         XFreeGC(dpy, dc.gc);
  54         XDestroyWindow(dpy, barwin);
  55         XFreeCursor(dpy, cursor[CurNormal]);
  56         XFreeCursor(dpy, cursor[CurResize]);
  57         XFreeCursor(dpy, cursor[CurMove]);
  58         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
  59         XSync(dpy, False);
  60         free(seltag);
  61 }
  62
  63 static unsigned long
  64 initcolor(const char *colstr) {
  65         Colormap cmap = DefaultColormap(dpy, screen);
  66         XColor color;
  67
  68         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
  69                 eprint("error, cannot allocate color '%s'\n", colstr);
  70         return color.pixel;
  71 }
  72
  73 static void
  74 initfont(const char *fontstr) {
  75         char *def, **missing;
  76         int i, n;
  77
  78         missing = NULL;
  79         if(dc.font.set)
  80                 XFreeFontSet(dpy, dc.font.set);
  81         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
  82         if(missing) {
  83                 while(n--)
  84                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
  85                 XFreeStringList(missing);
  86         }
  87         if(dc.font.set) {
  88                 XFontSetExtents *font_extents;
  89                 XFontStruct **xfonts;
  90                 char **font_names;
  91                 dc.font.ascent = dc.font.descent = 0;
  92                 font_extents = XExtentsOfFontSet(dc.font.set);
  93                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
  94                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
  95                         if(dc.font.ascent < (*xfonts)->ascent)
  96                                 dc.font.ascent = (*xfonts)->ascent;
  97                         if(dc.font.descent < (*xfonts)->descent)
  98                                 dc.font.descent = (*xfonts)->descent;
  99                         xfonts++;
 100                 }
 101         }
 102         else {
 103                 if(dc.font.xfont)
 104                         XFreeFont(dpy, dc.font.xfont);
 105                 dc.font.xfont = NULL;
 106                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
 107                         eprint("error, cannot load font: '%s'\n", fontstr);
 108                 dc.font.ascent = dc.font.xfont->ascent;
 109                 dc.font.descent = dc.font.xfont->descent;
 110         }
 111         dc.font.height = dc.font.ascent + dc.font.descent;
 112 }
 113
 114 static void
 115 scan(void) {
 116         unsigned int i, num;
 117         Window *wins, d1, d2;
 118         XWindowAttributes wa;
 119
 120         wins = NULL;
 121         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 122                 for(i = 0; i < num; i++) {
 123                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
 124                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 125                                 continue;
 126                         if(wa.map_state == IsViewable)
 127                                 manage(wins[i], &wa);
 128                 }
 129         }
 130         if(wins)
 131                 XFree(wins);
 132 }
 133
 134 static void
 135 setup(void) {
 136         int i, j;
 137         unsigned int mask;
 138         Window w;
 139         XModifierKeymap *modmap;
 140         XSetWindowAttributes wa;
 141
 142         /* init atoms */
 143         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 144         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 145         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 146         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 147         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 148         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 149                         PropModeReplace, (unsigned char *) netatom, NetLast);
 150         /* init cursors */
 151         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 152         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 153         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 154         /* init modifier map */
 155         numlockmask = 0;
 156         modmap = XGetModifierMapping(dpy);
 157         for (i = 0; i < 8; i++)
 158                 for (j = 0; j < modmap->max_keypermod; j++) {
 159                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 160                                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 161                                 numlockmask = (1 << i);
 162                 }
 163         XFreeModifiermap(modmap);
 164         /* select for events */
 165         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 166                 | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 167         wa.cursor = cursor[CurNormal];
 168         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 169         XSelectInput(dpy, root, wa.event_mask);
 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         if(!dc.font.set)
 209                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 210         /* multihead support */
 211         selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 212 }
 213
 214 /*
 215  * Startup Error handler to check if another window manager
 216  * is already running.
 217  */
 218 static int
 219 xerrorstart(Display *dsply, XErrorEvent *ee) {
 220         otherwm = True;
 221         return -1;
 222 }
 223
 224 /* extern */
 225
 226 void
 227 quit(const char *arg) {
 228         readin = running = False;
 229 }
 230
 231 /* There's no way to check accesses to destroyed windows, thus those cases are
 232  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 233  * default error handler, which may call exit.
 234  */
 235 int
 236 xerror(Display *dpy, XErrorEvent *ee) {
 237         if(ee->error_code == BadWindow
 238         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 239         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 240         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
 241         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 242         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
 243         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
 244         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 245                 return 0;
 246         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 247                 ee->request_code, ee->error_code);
 248         return xerrorxlib(dpy, ee); /* may call exit */
 249 }
 250
 251 int
 252 main(int argc, char *argv[]) {
 253         char *p;
 254         int r, xfd;
 255         fd_set rd;
 256         XEvent ev;
 257
 258         if(argc == 2 && !strncmp("-v", argv[1], 3))
 259                 eprint("dwm-"VERSION", © 2004-2007 Anselm R. Garbe, Sander van Dijk\n");
 260         else if(argc != 1)
 261                 eprint("usage: dwm [-v]\n");
 262         setlocale(LC_CTYPE, "");
 263         if(!(dpy = XOpenDisplay(0)))
 264                 eprint("dwm: cannot open display\n");
 265         xfd = ConnectionNumber(dpy);
 266         screen = DefaultScreen(dpy);
 267         root = RootWindow(dpy, screen);
 268         otherwm = False;
 269         XSetErrorHandler(xerrorstart);
 270         /* this causes an error if some other window manager is running */
 271         XSelectInput(dpy, root, SubstructureRedirectMask);
 272         XSync(dpy, False);
 273         if(otherwm)
 274                 eprint("dwm: another window manager is already running\n");
 275
 276         XSync(dpy, False);
 277         XSetErrorHandler(NULL);
 278         xerrorxlib = XSetErrorHandler(xerror);
 279         XSync(dpy, False);
 280         setup();
 281         drawstatus();
 282         scan();
 283
 284         /* main event loop, also reads status text from stdin */
 285         XSync(dpy, False);
 286         readin = True;
 287         while(running) {
 288                 FD_ZERO(&rd);
 289                 if(readin)
 290                         FD_SET(STDIN_FILENO, &rd);
 291                 FD_SET(xfd, &rd);
 292                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
 293                         if(errno == EINTR)
 294                                 continue;
 295                         eprint("select failed\n");
 296                 }
 297                 if(FD_ISSET(STDIN_FILENO, &rd)) {
 298                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
 299                         case -1:
 300                                 strncpy(stext, strerror(errno), sizeof stext - 1);
 301                                 stext[sizeof stext - 1] = '\0';
 302                                 readin = False;
 303                                 break;
 304                         case 0:
 305                                 strncpy(stext, "EOF", 4);
 306                                 readin = False;
 307                                 break;
 308                         default:
 309                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
 310                                 for(; p >= stext && *p != '\n'; --p);
 311                                 if(p > stext)
 312                                         strncpy(stext, p + 1, sizeof stext);
 313                         }
 314                         drawstatus();
 315                 }
 316                 while(XPending(dpy)) {
 317                         XNextEvent(dpy, &ev);
 318                         if(handler[ev.type])
 319                                 (handler[ev.type])(&ev); /* call handler */
 320                 }
 321         }
 322         cleanup();
 323         XCloseDisplay(dpy);
 324         return 0;
 325 }