dmenu.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <ctype.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7 #include <X11/Xatom.h>
   8 #include <X11/Xlib.h>
   9 #include <X11/Xutil.h>
  10 #ifdef XINERAMA
  11 #include <X11/extensions/Xinerama.h>
  12 #endif
  13 #include <draw.h>
  14
  15 #define INRECT(x,y,rx,ry,rw,rh) ((x) >= (rx) && (x) < (rx)+(rw) && (y) >= (ry) && (y) < (ry)+(rh))
  16 #define MIN(a,b)                ((a) < (b) ? (a) : (b))
  17 #define MAX(a,b)                ((a) > (b) ? (a) : (b))
  18 #define UTF8_CODEPOINT(c)       (((c) & 0xc0) != 0x80)
  19
  20 typedef struct Item Item;
  21 struct Item {
  22         char *text;
  23         Item *next;          /* traverses all items */
  24         Item *left, *right;  /* traverses matching items */
  25 };
  26
  27 static void appenditem(Item *item, Item **list, Item **last);
  28 static void calcoffsets(void);
  29 static char *cistrstr(const char *s, const char *sub);
  30 static void drawmenu(void);
  31 static void grabkeyboard(void);
  32 static void insert(const char *s, ssize_t n);
  33 static void keypress(XKeyEvent *e);
  34 static void match(void);
  35 static void paste(void);
  36 static void readstdin(void);
  37 static void run(void);
  38 static void setup(void);
  39 static void usage(void);
  40
  41 static char text[4096];
  42 static size_t cursor = 0;
  43 static const char *prompt = NULL;
  44 static const char *normbgcolor = "#cccccc";
  45 static const char *normfgcolor = "#000000";
  46 static const char *selbgcolor  = "#0066ff";
  47 static const char *selfgcolor  = "#ffffff";
  48 static unsigned int inputw = 0;
  49 static unsigned int lines = 0;
  50 static unsigned int mw, mh;
  51 static unsigned int promptw;
  52 static unsigned long normcol[ColLast];
  53 static unsigned long selcol[ColLast];
  54 static Atom utf8;
  55 static Bool topbar = True;
  56 static DC *dc;
  57 static Item *allitems, *matches;
  58 static Item *curr, *prev, *next, *sel;
  59 static Window root, win;
  60
  61 static int (*fstrncmp)(const char *, const char *, size_t) = strncmp;
  62 static char *(*fstrstr)(const char *, const char *) = strstr;
  63
  64 void
  65 appenditem(Item *item, Item **list, Item **last) {
  66         if(!*last)
  67                 *list = item;
  68         else
  69                 (*last)->right = item;
  70         item->left = *last;
  71         item->right = NULL;
  72         *last = item;
  73 }
  74
  75 void
  76 calcoffsets(void)
  77 {
  78         unsigned int h, i, n;
  79
  80         h = dc->font.height+2;
  81         if(lines > 0)
  82                 n = lines * h;
  83         else
  84                 n = mw - (promptw + inputw + textw(dc, "<") + textw(dc, ">"));
  85
  86         prev = next = curr;
  87         for(i = 0; next; next = next->right)
  88                 if((i += (lines > 0) ? h : MIN(textw(dc, next->text), mw/3)) > n)
  89                         break;
  90         for(i = 0; prev && prev->left; prev = prev->left)
  91                 if((i += (lines > 0) ? h : MIN(textw(dc, prev->left->text), mw/3)) > n)
  92                         break;
  93 }
  94
  95 char *
  96 cistrstr(const char *s, const char *sub) {
  97         size_t len;
  98
  99         for(len = strlen(sub); *s; s++)
 100                 if(!strncasecmp(s, sub, len))
 101                         return (char *)s;
 102         return NULL;
 103 }
 104
 105 void
 106 drawmenu(void) {
 107         Item *item;
 108
 109         dc->x = 0;
 110         dc->y = 0;
 111         drawrect(dc, 0, 0, mw, mh, BG(dc, normcol));
 112         dc->h = dc->font.height + 2;
 113         dc->y = topbar ? 0 : mh - dc->h;
 114         /* print prompt? */
 115         if(prompt) {
 116                 dc->w = promptw;
 117                 drawtext(dc, prompt, selcol);
 118                 dc->x = dc->w;
 119         }
 120         dc->w = mw - dc->x;
 121         /* print input area */
 122         if(matches && lines == 0 && textw(dc, text) <= inputw)
 123                 dc->w = inputw;
 124         drawtext(dc, text, normcol);
 125         drawrect(dc, textnw(dc, text, cursor) + dc->h/2 - 2, 2, 1, dc->h - 4, FG(dc, normcol));
 126
 127         if(lines > 0) {
 128                 dc->y = topbar ? dc->h : 0;
 129                 dc->w = mw - dc->x;
 130                 for(item = curr; item != next; item = item->right) {
 131                         drawtext(dc, item->text, (item == sel) ? selcol : normcol);
 132                         dc->y += dc->h;
 133                 }
 134         }
 135         else if(curr && (dc->w == inputw || curr->next)) {
 136                 dc->x += inputw;
 137                 dc->w = textw(dc, "<");
 138                 if(prev)
 139                         drawtext(dc, "<", normcol);
 140                 for(item = curr; item != next; item = item->right) {
 141                         dc->x += dc->w;
 142                         dc->w = MIN(textw(dc, item->text), mw/3);
 143                         drawtext(dc, item->text, (item == sel) ? selcol : normcol);
 144                 }
 145                 dc->w = textw(dc, ">");
 146                 dc->x = mw - dc->w;
 147                 if(next)
 148                         drawtext(dc, ">", normcol);
 149         }
 150         commitdraw(dc, win);
 151 }
 152
 153 void
 154 grabkeyboard(void) {
 155         int i;
 156
 157         for(i = 0; i < 1000; i++) {
 158                 if(!XGrabKeyboard(dc->dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime))
 159                         return;
 160                 usleep(1000);
 161         }
 162         eprintf("cannot grab keyboard\n");
 163 }
 164
 165 void
 166 insert(const char *s, ssize_t n) {
 167         memmove(text + cursor + n, text + cursor, sizeof text - cursor - n);
 168         if(n > 0)
 169                 memcpy(text + cursor, s, n);
 170         cursor += n;
 171         match();
 172 }
 173
 174 void
 175 keypress(XKeyEvent *e) {
 176         char buf[sizeof text];
 177         int n;
 178         size_t len;
 179         KeySym ksym;
 180
 181         len = strlen(text);
 182         XLookupString(e, buf, sizeof buf, &ksym, NULL);
 183         if(e->state & ControlMask) {
 184                 switch(tolower(ksym)) {
 185                 default:
 186                         return;
 187                 case XK_a:
 188                         ksym = XK_Home;
 189                         break;
 190                 case XK_b:
 191                         ksym = XK_Left;
 192                         break;
 193                 case XK_c:
 194                         ksym = XK_Escape;
 195                         break;
 196                 case XK_e:
 197                         ksym = XK_End;
 198                         break;
 199                 case XK_f:
 200                         ksym = XK_Right;
 201                         break;
 202                 case XK_h:
 203                         ksym = XK_BackSpace;
 204                         break;
 205                 case XK_i:
 206                         ksym = XK_Tab;
 207                         break;
 208                 case XK_j:
 209                 case XK_m:
 210                         ksym = XK_Return;
 211                         break;
 212                 case XK_k:  /* delete right */
 213                         text[cursor] = '\0';
 214                         match();
 215                         break;
 216                 case XK_n:
 217                         ksym = XK_Down;
 218                         break;
 219                 case XK_p:
 220                         ksym = XK_Up;
 221                         break;
 222                 case XK_u:  /* delete left */
 223                         insert(NULL, -cursor);
 224                         break;
 225                 case XK_w:  /* delete word */
 226                         if(cursor == 0)
 227                                 return;
 228                         n = 0;
 229                         while(cursor - n++ > 0 && text[cursor - n] == ' ');
 230                         while(cursor - n++ > 0 && text[cursor - n] != ' ');
 231                         insert(NULL, 1-n);
 232                         break;
 233                 case XK_y:  /* paste selection */
 234                         XConvertSelection(dc->dpy, XA_PRIMARY, utf8, None, win, CurrentTime);
 235                         /* causes SelectionNotify event */
 236                         return;
 237                 }
 238         }
 239         switch(ksym) {
 240         default:
 241                 if(!iscntrl((int)*buf))
 242                         insert(buf, MIN(strlen(buf), sizeof text - cursor));
 243                 break;
 244         case XK_BackSpace:
 245                 if(cursor == 0)
 246                         return;
 247                 for(n = 1; cursor - n > 0 && !UTF8_CODEPOINT(text[cursor - n]); n++);
 248                 insert(NULL, -n);
 249                 break;
 250         case XK_Delete:
 251                 if(cursor == len)
 252                         return;
 253                 for(n = 1; cursor + n < len && !UTF8_CODEPOINT(text[cursor + n]); n++);
 254                 cursor += n;
 255                 insert(NULL, -n);
 256                 break;
 257         case XK_End:
 258                 if(cursor < len) {
 259                         cursor = len;
 260                         break;
 261                 }
 262                 while(next) {
 263                         sel = curr = next;
 264                         calcoffsets();
 265                 }
 266                 while(sel && sel->right)
 267                         sel = sel->right;
 268                 break;
 269         case XK_Escape:
 270                 exit(EXIT_FAILURE);
 271         case XK_Home:
 272                 if(sel == matches) {
 273                         cursor = 0;
 274                         break;
 275                 }
 276                 sel = curr = matches;
 277                 calcoffsets();
 278                 break;
 279         case XK_Left:
 280                 if(cursor > 0 && (!sel || !sel->left || lines > 0)) {
 281                         while(cursor-- > 0 && !UTF8_CODEPOINT(text[cursor]));
 282                         break;
 283                 }
 284                 else if(lines > 0)
 285                         return;
 286         case XK_Up:
 287                 if(!sel || !sel->left)
 288                         return;
 289                 sel = sel->left;
 290                 if(sel->right == curr) {
 291                         curr = prev;
 292                         calcoffsets();
 293                 }
 294                 break;
 295         case XK_Next:
 296                 if(!next)
 297                         return;
 298                 sel = curr = next;
 299                 calcoffsets();
 300                 break;
 301         case XK_Prior:
 302                 if(!prev)
 303                         return;
 304                 sel = curr = prev;
 305                 calcoffsets();
 306                 break;
 307         case XK_Return:
 308         case XK_KP_Enter:
 309                 fputs((sel && !(e->state & ShiftMask)) ? sel->text : text, stdout);
 310                 fflush(stdout);
 311                 exit(EXIT_SUCCESS);
 312         case XK_Right:
 313                 if(cursor < len) {
 314                         while(cursor++ < len && !UTF8_CODEPOINT(text[cursor]));
 315                         break;
 316                 }
 317                 else if(lines > 0)
 318                         return;
 319         case XK_Down:
 320                 if(!sel || !sel->right)
 321                         return;
 322                 sel = sel->right;
 323                 if(sel == next) {
 324                         curr = next;
 325                         calcoffsets();
 326                 }
 327                 break;
 328         case XK_Tab:
 329                 if(!sel)
 330                         return;
 331                 strncpy(text, sel->text, sizeof text);
 332                 cursor = strlen(text);
 333                 match();
 334                 break;
 335         }
 336         drawmenu();
 337 }
 338
 339 void
 340 match(void) {
 341         unsigned int len;
 342         Item *item, *itemend, *lexact, *lprefix, *lsubstr, *exactend, *prefixend, *substrend;
 343
 344         len = strlen(text);
 345         matches = lexact = lprefix = lsubstr = itemend = exactend = prefixend = substrend = NULL;
 346         for(item = allitems; item; item = item->next)
 347                 if(!fstrncmp(text, item->text, len + 1))
 348                         appenditem(item, &lexact, &exactend);
 349                 else if(!fstrncmp(text, item->text, len))
 350                         appenditem(item, &lprefix, &prefixend);
 351                 else if(fstrstr(item->text, text))
 352                         appenditem(item, &lsubstr, &substrend);
 353         if(lexact) {
 354                 matches = lexact;
 355                 itemend = exactend;
 356         }
 357         if(lprefix) {
 358                 if(itemend) {
 359                         itemend->right = lprefix;
 360                         lprefix->left = itemend;
 361                 }
 362                 else
 363                         matches = lprefix;
 364                 itemend = prefixend;
 365         }
 366         if(lsubstr) {
 367                 if(itemend) {
 368                         itemend->right = lsubstr;
 369                         lsubstr->left = itemend;
 370                 }
 371                 else
 372                         matches = lsubstr;
 373         }
 374         curr = prev = next = sel = matches;
 375         calcoffsets();
 376 }
 377
 378 void
 379 paste(void) {
 380         char *p, *q;
 381         int di;
 382         unsigned long dl;
 383         Atom da;
 384
 385         XGetWindowProperty(dc->dpy, win, utf8, 0, sizeof text - cursor, True,
 386                            utf8, &da, &di, &dl, &dl, (unsigned char **)&p);
 387         insert(p, (q = strchr(p, '\n')) ? q-p : strlen(p));
 388         XFree(p);
 389         drawmenu();
 390 }
 391
 392 void
 393 readstdin(void) {
 394         char buf[sizeof text], *p;
 395         Item *item, *new;
 396
 397         allitems = NULL;
 398         for(item = NULL; fgets(buf, sizeof buf, stdin); item = new) {
 399                 if((p = strchr(buf, '\n')))
 400                         *p = '\0';
 401                 if(!(new = malloc(sizeof *new)))
 402                         eprintf("cannot malloc %u bytes\n", sizeof *new);
 403                 if(!(new->text = strdup(buf)))
 404                         eprintf("cannot strdup %u bytes\n", strlen(buf));
 405                 inputw = MAX(inputw, textw(dc, new->text));
 406                 new->next = new->left = new->right = NULL;
 407                 if(item)
 408                         item->next = new;
 409                 else
 410                         allitems = new;
 411         }
 412 }
 413
 414 void
 415 run(void) {
 416         XEvent ev;
 417
 418         while(!XNextEvent(dc->dpy, &ev))
 419                 switch(ev.type) {
 420                 case Expose:
 421                         if(ev.xexpose.count == 0)
 422                                 drawmenu();
 423                         break;
 424                 case KeyPress:
 425                         keypress(&ev.xkey);
 426                         break;
 427                 case SelectionNotify:
 428                         if(ev.xselection.property == utf8)
 429                                 paste();
 430                         break;
 431                 case VisibilityNotify:
 432                         if(ev.xvisibility.state != VisibilityUnobscured)
 433                                 XRaiseWindow(dc->dpy, win);
 434                         break;
 435                 }
 436 }
 437
 438 void
 439 setup(void) {
 440         int x, y, screen;
 441         XSetWindowAttributes wa;
 442 #ifdef XINERAMA
 443         int n;
 444         XineramaScreenInfo *info;
 445 #endif
 446
 447         screen = DefaultScreen(dc->dpy);
 448         root = RootWindow(dc->dpy, screen);
 449         utf8 = XInternAtom(dc->dpy, "UTF8_STRING", False);
 450
 451         normcol[ColBG] = getcolor(dc, normbgcolor);
 452         normcol[ColFG] = getcolor(dc, normfgcolor);
 453         selcol[ColBG] = getcolor(dc, selbgcolor);
 454         selcol[ColFG] = getcolor(dc, selfgcolor);
 455
 456         /* input window geometry */
 457         mh = (dc->font.height + 2) * (lines + 1);
 458 #ifdef XINERAMA
 459         if((info = XineramaQueryScreens(dc->dpy, &n))) {
 460                 int i, di;
 461                 unsigned int du;
 462                 Window dw;
 463
 464                 XQueryPointer(dc->dpy, root, &dw, &dw, &x, &y, &di, &di, &du);
 465                 for(i = 0; i < n; i++)
 466                         if(INRECT(x, y, info[i].x_org, info[i].y_org, info[i].width, info[i].height))
 467                                 break;
 468                 x = info[i].x_org;
 469                 y = info[i].y_org + (topbar ? 0 : info[i].height - mh);
 470                 mw = info[i].width;
 471                 XFree(info);
 472         }
 473         else
 474 #endif
 475         {
 476                 x = 0;
 477                 y = topbar ? 0 : DisplayHeight(dc->dpy, screen) - mh;
 478                 mw = DisplayWidth(dc->dpy, screen);
 479         }
 480         /* input window */
 481         wa.override_redirect = True;
 482         wa.background_pixmap = ParentRelative;
 483         wa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
 484         win = XCreateWindow(dc->dpy, root, x, y, mw, mh, 0,
 485                         DefaultDepth(dc->dpy, screen), CopyFromParent,
 486                         DefaultVisual(dc->dpy, screen),
 487                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 488
 489         grabkeyboard();
 490         setcanvas(dc, win, mw, mh);
 491         inputw = MIN(inputw, mw/3);
 492         promptw = prompt ? MIN(textw(dc, prompt), mw/5) : 0;
 493         XMapRaised(dc->dpy, win);
 494         text[0] = '\0';
 495         match();
 496 }
 497
 498 void
 499 usage(void) {
 500         fputs("usage: dmenu [-b] [-i] [-l lines] [-p prompt] [-fn font] [-nb color]\n"
 501               "             [-nf color] [-sb color] [-sf color] [-v]\n", stderr);
 502         exit(EXIT_FAILURE);
 503 }
 504
 505 int
 506 main(int argc, char *argv[]) {
 507         int i;
 508
 509         progname = "dmenu";
 510         dc = initdraw();
 511
 512         for(i = 1; i < argc; i++)
 513                 /* single flags */
 514                 if(!strcmp(argv[i], "-v")) {
 515                         fputs("dmenu-"VERSION", © 2006-2010 dmenu engineers, see LICENSE for details\n", stdout);
 516                         exit(EXIT_SUCCESS);
 517                 }
 518                 else if(!strcmp(argv[i], "-b"))
 519                         topbar = False;
 520                 else if(!strcmp(argv[i], "-i")) {
 521                         fstrncmp = strncasecmp;
 522                         fstrstr = cistrstr;
 523                 }
 524                 else if(i == argc-1)
 525                         usage();
 526                 /* double flags */
 527                 else if(!strcmp(argv[i], "-l")) {
 528                         lines = atoi(argv[++i]);
 529                 }
 530                 else if(!strcmp(argv[i], "-p"))
 531                         prompt = argv[++i];
 532                 else if(!strcmp(argv[i], "-fn"))
 533                         initfont(dc, argv[i++]);
 534                 else if(!strcmp(argv[i], "-nb"))
 535                         normbgcolor = argv[++i];
 536                 else if(!strcmp(argv[i], "-nf"))
 537                         normfgcolor = argv[++i];
 538                 else if(!strcmp(argv[i], "-sb"))
 539                         selbgcolor = argv[++i];
 540                 else if(!strcmp(argv[i], "-sf"))
 541                         selfgcolor = argv[++i];
 542                 else
 543                         usage();
 544
 545         readstdin();
 546         setup();
 547         run();
 548
 549         return EXIT_FAILURE;  /* should not reach */
 550 }