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  * © 2007 Premysl Hruby <dfenze at gmail dot com>
   4  * See LICENSE file for license details. */
   5 #include "dwm.h"
   6 #include <errno.h>
   7 #include <locale.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12 #include <sys/select.h>
  13 #include <X11/cursorfont.h>
  14 #include <X11/keysym.h>
  15 #include <X11/Xatom.h>
  16 #include <X11/Xproto.h>
  17
  18 /* extern */
  19
  20 char stext[256];
  21 int screen, sx, sy, sw, sh, wax, way, waw, wah;
  22 unsigned int bh, bpos, ntags, numlockmask;
  23 Atom wmatom[WMLast], netatom[NetLast];
  24 Bool *seltag;
  25 Bool selscreen = True;
  26 Client *clients = NULL;
  27 Client *sel = NULL;
  28 Client *stack = NULL;
  29 Cursor cursor[CurLast];
  30 Display *dpy;
  31 DC dc = {0};
  32 Window root, barwin;
  33
  34 /* static */
  35
  36 static int (*xerrorxlib)(Display *, XErrorEvent *);
  37 static Bool otherwm, readin;
  38 static Bool running = True;
  39
  40 static void
  41 cleanup(void) {
  42         close(STDIN_FILENO);
  43         while(stack) {
  44                 if(stack->isbanned)
  45                         XMoveWindow(dpy, stack->win, stack->x, stack->y);
  46                 unmanage(stack);
  47         }
  48         if(dc.font.set)
  49                 XFreeFontSet(dpy, dc.font.set);
  50         else
  51                 XFreeFont(dpy, dc.font.xfont);
  52         XUngrabKey(dpy, AnyKey, AnyModifier, root);
  53         XFreePixmap(dpy, dc.drawable);
  54         XFreeGC(dpy, dc.gc);
  55         XDestroyWindow(dpy, barwin);
  56         XFreeCursor(dpy, cursor[CurNormal]);
  57         XFreeCursor(dpy, cursor[CurResize]);
  58         XFreeCursor(dpy, cursor[CurMove]);
  59         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
  60         XSync(dpy, False);
  61         free(seltag);
  62 }
  63
  64 static unsigned long
  65 initcolor(const char *colstr) {
  66         Colormap cmap = DefaultColormap(dpy, screen);
  67         XColor color;
  68
  69         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
  70                 eprint("error, cannot allocate color '%s'\n", colstr);
  71         return color.pixel;
  72 }
  73
  74 static void
  75 initfont(const char *fontstr) {
  76         char *def, **missing;
  77         int i, n;
  78
  79         missing = NULL;
  80         if(dc.font.set)
  81                 XFreeFontSet(dpy, dc.font.set);
  82         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
  83         if(missing) {
  84                 while(n--)
  85                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
  86                 XFreeStringList(missing);
  87         }
  88         if(dc.font.set) {
  89                 XFontSetExtents *font_extents;
  90                 XFontStruct **xfonts;
  91                 char **font_names;
  92                 dc.font.ascent = dc.font.descent = 0;
  93                 font_extents = XExtentsOfFontSet(dc.font.set);
  94                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
  95                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
  96                         if(dc.font.ascent < (*xfonts)->ascent)
  97                                 dc.font.ascent = (*xfonts)->ascent;
  98                         if(dc.font.descent < (*xfonts)->descent)
  99                                 dc.font.descent = (*xfonts)->descent;
 100                         xfonts++;
 101                 }
 102         }
 103         else {
 104                 if(dc.font.xfont)
 105                         XFreeFont(dpy, dc.font.xfont);
 106                 dc.font.xfont = NULL;
 107                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
 108                         eprint("error, cannot load font: '%s'\n", fontstr);
 109                 dc.font.ascent = dc.font.xfont->ascent;
 110                 dc.font.descent = dc.font.xfont->descent;
 111         }
 112         dc.font.height = dc.font.ascent + dc.font.descent;
 113 }
 114
 115 static void
 116 scan(void) {
 117         unsigned int i, num;
 118         Window *wins, d1, d2;
 119         XWindowAttributes wa;
 120
 121         wins = NULL;
 122         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 123                 for(i = 0; i < num; i++) {
 124                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
 125                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 126                                 continue;
 127                         if(wa.map_state == IsViewable)
 128                                 manage(wins[i], &wa);
 129                 }
 130         }
 131         if(wins)
 132                 XFree(wins);
 133 }
 134
 135 static void
 136 setup(void) {
 137         int i, j;
 138         unsigned int mask;
 139         Window w;
 140         XModifierKeymap *modmap;
 141         XSetWindowAttributes wa;
 142
 143         /* init atoms */
 144         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 145         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 146         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 147         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 148         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 149         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 150                         PropModeReplace, (unsigned char *) netatom, NetLast);
 151         /* init cursors */
 152         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 153         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 154         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 155         /* init modifier map */
 156         numlockmask = 0;
 157         modmap = XGetModifierMapping(dpy);
 158         for (i = 0; i < 8; i++)
 159                 for (j = 0; j < modmap->max_keypermod; j++) {
 160                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 161                                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 162                                 numlockmask = (1 << i);
 163                 }
 164         XFreeModifiermap(modmap);
 165         /* select for events */
 166         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 167                 | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 168         wa.cursor = cursor[CurNormal];
 169         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 170         XSelectInput(dpy, root, wa.event_mask);
 171         grabkeys();
 172         compileregs();
 173         for(ntags = 0; tags[ntags]; ntags++);
 174         seltag = emallocz(sizeof(Bool) * ntags);
 175         seltag[0] = True;
 176         /* style */
 177         dc.norm[ColBorder] = initcolor(NORMBORDERCOLOR);
 178         dc.norm[ColBG] = initcolor(NORMBGCOLOR);
 179         dc.norm[ColFG] = initcolor(NORMFGCOLOR);
 180         dc.sel[ColBorder] = initcolor(SELBORDERCOLOR);
 181         dc.sel[ColBG] = initcolor(SELBGCOLOR);
 182         dc.sel[ColFG] = initcolor(SELFGCOLOR);
 183         initfont(FONT);
 184         /* geometry */
 185         sx = sy = 0;
 186         sw = DisplayWidth(dpy, screen);
 187         sh = DisplayHeight(dpy, screen);
 188         initlayouts();
 189         /* bar */
 190         dc.h = bh = dc.font.height + 2;
 191         wa.override_redirect = 1;
 192         wa.background_pixmap = ParentRelative;
 193         wa.event_mask = ButtonPressMask | ExposureMask;
 194         barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
 195                         DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
 196                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 197         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 198         bpos = BARPOS;
 199         updatebarpos();
 200         XMapRaised(dpy, barwin);
 201         strcpy(stext, "dwm-"VERSION);
 202         /* pixmap for everything */
 203         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 204         dc.gc = XCreateGC(dpy, root, 0, 0);
 205         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 206         if(!dc.font.set)
 207                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 208         /* multihead support */
 209         selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 210 }
 211
 212 /*
 213  * Startup Error handler to check if another window manager
 214  * is already running.
 215  */
 216 static int
 217 xerrorstart(Display *dsply, XErrorEvent *ee) {
 218         otherwm = True;
 219         return -1;
 220 }
 221
 222 /* extern */
 223
 224 void
 225 quit(const char *arg) {
 226         readin = running = False;
 227 }
 228
 229 void
 230 updatebarpos(void) {
 231         XEvent ev;
 232
 233         wax = sx;
 234         way = sy;
 235         wah = sh;
 236         waw = sw;
 237         switch(bpos) {
 238         default:
 239                 wah -= bh;
 240                 way += bh;
 241                 XMoveWindow(dpy, barwin, sx, sy);
 242                 break;
 243         case BarBot:
 244                 wah -= bh;
 245                 XMoveWindow(dpy, barwin, sx, sy + wah);
 246                 break;
 247         case BarOff:
 248                 XMoveWindow(dpy, barwin, sx, sy - bh);
 249                 break;
 250         }
 251         XSync(dpy, False);
 252         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
 253 }
 254
 255 /* There's no way to check accesses to destroyed windows, thus those cases are
 256  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 257  * default error handler, which may call exit.
 258  */
 259 int
 260 xerror(Display *dpy, XErrorEvent *ee) {
 261         if(ee->error_code == BadWindow
 262         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 263         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 264         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
 265         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 266         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
 267         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
 268         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 269                 return 0;
 270         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 271                 ee->request_code, ee->error_code);
 272         return xerrorxlib(dpy, ee); /* may call exit */
 273 }
 274
 275 int
 276 main(int argc, char *argv[]) {
 277         char *p;
 278         int r, xfd;
 279         fd_set rd;
 280         XEvent ev;
 281
 282         if(argc == 2 && !strcmp("-v", argv[1]))
 283                 eprint("dwm-"VERSION", © 2004-2007 Anselm R. Garbe, Sander van Dijk\n");
 284         else if(argc != 1)
 285                 eprint("usage: dwm [-v]\n");
 286         setlocale(LC_CTYPE, "");
 287         if(!(dpy = XOpenDisplay(0)))
 288                 eprint("dwm: cannot open display\n");
 289         xfd = ConnectionNumber(dpy);
 290         screen = DefaultScreen(dpy);
 291         root = RootWindow(dpy, screen);
 292         otherwm = False;
 293         XSetErrorHandler(xerrorstart);
 294         /* this causes an error if some other window manager is running */
 295         XSelectInput(dpy, root, SubstructureRedirectMask);
 296         XSync(dpy, False);
 297         if(otherwm)
 298                 eprint("dwm: another window manager is already running\n");
 299
 300         XSync(dpy, False);
 301         XSetErrorHandler(NULL);
 302         xerrorxlib = XSetErrorHandler(xerror);
 303         XSync(dpy, False);
 304         setup();
 305         drawstatus();
 306         scan();
 307
 308         /* main event loop, also reads status text from stdin */
 309         XSync(dpy, False);
 310         readin = True;
 311         while(running) {
 312                 FD_ZERO(&rd);
 313                 if(readin)
 314                         FD_SET(STDIN_FILENO, &rd);
 315                 FD_SET(xfd, &rd);
 316                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
 317                         if(errno == EINTR)
 318                                 continue;
 319                         eprint("select failed\n");
 320                 }
 321                 if(FD_ISSET(STDIN_FILENO, &rd)) {
 322                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
 323                         case -1:
 324                                 strncpy(stext, strerror(errno), sizeof stext - 1);
 325                                 stext[sizeof stext - 1] = '\0';
 326                                 readin = False;
 327                                 break;
 328                         case 0:
 329                                 strncpy(stext, "EOF", 4);
 330                                 readin = False;
 331                                 break;
 332                         default:
 333                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
 334                                 for(; p >= stext && *p != '\n'; --p);
 335                                 if(p > stext)
 336                                         strncpy(stext, p + 1, sizeof stext);
 337                         }
 338                         drawstatus();
 339                 }
 340                 while(XPending(dpy)) {
 341                         XNextEvent(dpy, &ev);
 342                         if(handler[ev.type])
 343                                 (handler[ev.type])(&ev); /* call handler */
 344                 }
 345         }
 346         cleanup();
 347         XCloseDisplay(dpy);
 348         return 0;
 349 }