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 calcoffsetsh(void);
  29 static void calcoffsetsv(void);
  30 static char *cistrstr(const char *s, const char *sub);
  31 static void drawmenu(void);
  32 static void drawmenuh(void);
  33 static void drawmenuv(void);
  34 static void grabkeyboard(void);
  35 static void insert(const char *s, ssize_t n);
  36 static void keypress(XKeyEvent *e);
  37 static void match(void);
  38 static void paste(void);
  39 static void readstdin(void);
  40 static void run(void);
  41 static void setup(void);
  42 static void usage(void);
  43
  44 static char text[4096];
  45 static size_t cursor = 0;
  46 static const char *prompt = NULL;
  47 static const char *normbgcolor = "#cccccc";
  48 static const char *normfgcolor = "#000000";
  49 static const char *selbgcolor  = "#0066ff";
  50 static const char *selfgcolor  = "#ffffff";
  51 static unsigned int inputw = 0;
  52 static unsigned int lines = 0;
  53 static unsigned int mw, mh;
  54 static unsigned long normcol[ColLast];
  55 static unsigned long selcol[ColLast];
  56 static Atom utf8;
  57 static Bool topbar = True;
  58 static DC *dc;
  59 static Item *allitems, *matches;
  60 static Item *curr, *prev, *next, *sel;
  61 static Window root, win;
  62
  63 static int (*fstrncmp)(const char *, const char *, size_t) = strncmp;
  64 static char *(*fstrstr)(const char *, const char *) = strstr;
  65 static void (*calcoffsets)(void) = calcoffsetsh;
  66
  67 void
  68 appenditem(Item *item, Item **list, Item **last) {
  69         if(!*last)
  70                 *list = item;
  71         else
  72                 (*last)->right = item;
  73         item->left = *last;
  74         item->right = NULL;
  75         *last = item;
  76 }
  77
  78 void
  79 calcoffsetsh(void) {
  80         unsigned int w, x;
  81
  82         w = (prompt ? textw(dc, prompt) : 0) + inputw + textw(dc, "<") + textw(dc, ">");
  83         for(x = w, next = curr; next; next = next->right)
  84                 if((x += MIN(textw(dc, next->text), mw / 3)) > mw)
  85                         break;
  86         for(x = w, prev = curr; prev && prev->left; prev = prev->left)
  87                 if((x += MIN(textw(dc, prev->left->text), mw / 3)) > mw)
  88                         break;
  89 }
  90
  91 void
  92 calcoffsetsv(void) {
  93         unsigned int i;
  94
  95         next = prev = curr;
  96         for(i = 0; i < lines && next; i++)
  97                 next = next->right;
  98         for(i = 0; i < lines && prev && prev->left; i++)
  99                 prev = prev->left;
 100 }
 101
 102 char *
 103 cistrstr(const char *s, const char *sub) {
 104         size_t len;
 105
 106         for(len = strlen(sub); *s; s++)
 107                 if(!strncasecmp(s, sub, len))
 108                         return (char *)s;
 109         return NULL;
 110 }
 111
 112 void
 113 drawmenu(void) {
 114         dc->x = 0;
 115         dc->y = 0;
 116         drawrect(dc, 0, 0, mw, mh, BG(dc, normcol));
 117         dc->h = dc->font.height + 2;
 118         dc->y = topbar ? 0 : mh - dc->h;
 119         /* print prompt? */
 120         if(prompt) {
 121                 dc->w = textw(dc, prompt);
 122                 drawtext(dc, prompt, selcol);
 123                 dc->x = dc->w;
 124         }
 125         dc->w = mw - dc->x;
 126         /* print input area */
 127         if(matches && lines == 0 && textw(dc, text) <= inputw)
 128                 dc->w = inputw;
 129         drawtext(dc, text, normcol);
 130         drawrect(dc, textnw(dc, text, cursor) + dc->h/2 - 2, 2, 1, dc->h - 4, FG(dc, normcol));
 131         if(lines > 0)
 132                 drawmenuv();
 133         else if(curr && (dc->w == inputw || curr->next))
 134                 drawmenuh();
 135         commitdraw(dc, win);
 136 }
 137
 138 void
 139 drawmenuh(void) {
 140         Item *item;
 141
 142         dc->x += inputw;
 143         dc->w = textw(dc, "<");
 144         if(curr->left)
 145                 drawtext(dc, "<", normcol);
 146         for(item = curr; item != next; item = item->right) {
 147                 dc->x += dc->w;
 148                 dc->w = MIN(textw(dc, item->text), mw / 3);
 149                 drawtext(dc, item->text, (item == sel) ? selcol : normcol);
 150         }
 151         dc->w = textw(dc, ">");
 152         dc->x = mw - dc->w;
 153         if(next)
 154                 drawtext(dc, ">", normcol);
 155 }
 156
 157 void
 158 drawmenuv(void) {
 159         Item *item;
 160
 161         dc->y = topbar ? dc->h : 0;
 162         dc->w = mw - dc->x;
 163         for(item = curr; item != next; item = item->right) {
 164                 drawtext(dc, item->text, (item == sel) ? selcol : normcol);
 165                 dc->y += dc->h;
 166         }
 167 }
 168
 169 void
 170 grabkeyboard(void) {
 171         int i;
 172
 173         for(i = 0; i < 1000; i++) {
 174                 if(!XGrabKeyboard(dc->dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime))
 175                         return;
 176                 usleep(1000);
 177         }
 178         eprintf("cannot grab keyboard\n");
 179 }
 180
 181 void
 182 insert(const char *s, ssize_t n) {
 183         memmove(text + cursor + n, text + cursor, sizeof text - cursor - n);
 184         if(n > 0)
 185                 memcpy(text + cursor, s, n);
 186         cursor += n;
 187         match();
 188 }
 189
 190 void
 191 keypress(XKeyEvent *e) {
 192         char buf[sizeof text];
 193         int n;
 194         size_t len;
 195         KeySym ksym;
 196
 197         len = strlen(text);
 198         XLookupString(e, buf, sizeof buf, &ksym, NULL);
 199         if(e->state & ControlMask) {
 200                 switch(tolower(ksym)) {
 201                 default:
 202                         return;
 203                 case XK_a:
 204                         ksym = XK_Home;
 205                         break;
 206                 case XK_b:
 207                         ksym = XK_Left;
 208                         break;
 209                 case XK_c:
 210                         ksym = XK_Escape;
 211                         break;
 212                 case XK_e:
 213                         ksym = XK_End;
 214                         break;
 215                 case XK_f:
 216                         ksym = XK_Right;
 217                         break;
 218                 case XK_h:
 219                         ksym = XK_BackSpace;
 220                         break;
 221                 case XK_i:
 222                         ksym = XK_Tab;
 223                         break;
 224                 case XK_j:
 225                 case XK_m:
 226                         ksym = XK_Return;
 227                         break;
 228                 case XK_k:  /* delete right */
 229                         text[cursor] = '\0';
 230                         match();
 231                         break;
 232                 case XK_n:
 233                         ksym = XK_Down;
 234                         break;
 235                 case XK_p:
 236                         ksym = XK_Up;
 237                         break;
 238                 case XK_u:  /* delete left */
 239                         insert(NULL, -cursor);
 240                         break;
 241                 case XK_w:  /* delete word */
 242                         if(cursor == 0)
 243                                 return;
 244                         n = 0;
 245                         while(cursor - n++ > 0 && text[cursor - n] == ' ');
 246                         while(cursor - n++ > 0 && text[cursor - n] != ' ');
 247                         insert(NULL, 1-n);
 248                         break;
 249                 case XK_y:  /* paste selection */
 250                         XConvertSelection(dc->dpy, XA_PRIMARY, utf8, None, win, CurrentTime);
 251                         /* causes SelectionNotify event */
 252                         return;
 253                 }
 254         }
 255         switch(ksym) {
 256         default:
 257                 if(!iscntrl((int)*buf))
 258                         insert(buf, MIN(strlen(buf), sizeof text - cursor));
 259                 break;
 260         case XK_BackSpace:
 261                 if(cursor == 0)
 262                         return;
 263                 for(n = 1; cursor - n > 0 && !UTF8_CODEPOINT(text[cursor - n]); n++);
 264                 insert(NULL, -n);
 265                 break;
 266         case XK_Delete:
 267                 if(cursor == len)
 268                         return;
 269                 for(n = 1; cursor + n < len && !UTF8_CODEPOINT(text[cursor + n]); n++);
 270                 cursor += n;
 271                 insert(NULL, -n);
 272                 break;
 273         case XK_End:
 274                 if(cursor < len) {
 275                         cursor = len;
 276                         break;
 277                 }
 278                 while(next) {
 279                         sel = curr = next;
 280                         calcoffsets();
 281                 }
 282                 while(sel && sel->right)
 283                         sel = sel->right;
 284                 break;
 285         case XK_Escape:
 286                 exit(EXIT_FAILURE);
 287         case XK_Home:
 288                 if(sel == matches) {
 289                         cursor = 0;
 290                         break;
 291                 }
 292                 sel = curr = matches;
 293                 calcoffsets();
 294                 break;
 295         case XK_Left:
 296                 if(cursor > 0 && (!sel || !sel->left || lines > 0)) {
 297                         while(cursor-- > 0 && !UTF8_CODEPOINT(text[cursor]));
 298                         break;
 299                 }
 300                 else if(lines > 0)
 301                         return;
 302         case XK_Up:
 303                 if(!sel || !sel->left)
 304                         return;
 305                 sel = sel->left;
 306                 if(sel->right == curr) {
 307                         curr = prev;
 308                         calcoffsets();
 309                 }
 310                 break;
 311         case XK_Next:
 312                 if(!next)
 313                         return;
 314                 sel = curr = next;
 315                 calcoffsets();
 316                 break;
 317         case XK_Prior:
 318                 if(!prev)
 319                         return;
 320                 sel = curr = prev;
 321                 calcoffsets();
 322                 break;
 323         case XK_Return:
 324         case XK_KP_Enter:
 325                 fputs((sel && !(e->state & ShiftMask)) ? sel->text : text, stdout);
 326                 fflush(stdout);
 327                 exit(EXIT_SUCCESS);
 328         case XK_Right:
 329                 if(cursor < len) {
 330                         while(cursor++ < len && !UTF8_CODEPOINT(text[cursor]));
 331                         break;
 332                 }
 333                 else if(lines > 0)
 334                         return;
 335         case XK_Down:
 336                 if(!sel || !sel->right)
 337                         return;
 338                 sel = sel->right;
 339                 if(sel == next) {
 340                         curr = next;
 341                         calcoffsets();
 342                 }
 343                 break;
 344         case XK_Tab:
 345                 if(!sel)
 346                         return;
 347                 strncpy(text, sel->text, sizeof text);
 348                 cursor = strlen(text);
 349                 match();
 350                 break;
 351         }
 352         drawmenu();
 353 }
 354
 355 void
 356 match(void) {
 357         unsigned int len;
 358         Item *item, *itemend, *lexact, *lprefix, *lsubstr, *exactend, *prefixend, *substrend;
 359
 360         len = strlen(text);
 361         matches = lexact = lprefix = lsubstr = itemend = exactend = prefixend = substrend = NULL;
 362         for(item = allitems; item; item = item->next)
 363                 if(!fstrncmp(text, item->text, len + 1))
 364                         appenditem(item, &lexact, &exactend);
 365                 else if(!fstrncmp(text, item->text, len))
 366                         appenditem(item, &lprefix, &prefixend);
 367                 else if(fstrstr(item->text, text))
 368                         appenditem(item, &lsubstr, &substrend);
 369         if(lexact) {
 370                 matches = lexact;
 371                 itemend = exactend;
 372         }
 373         if(lprefix) {
 374                 if(itemend) {
 375                         itemend->right = lprefix;
 376                         lprefix->left = itemend;
 377                 }
 378                 else
 379                         matches = lprefix;
 380                 itemend = prefixend;
 381         }
 382         if(lsubstr) {
 383                 if(itemend) {
 384                         itemend->right = lsubstr;
 385                         lsubstr->left = itemend;
 386                 }
 387                 else
 388                         matches = lsubstr;
 389         }
 390         curr = prev = next = sel = matches;
 391         calcoffsets();
 392 }
 393
 394 void
 395 paste(void) {
 396         char *p, *q;
 397         int di;
 398         unsigned long dl;
 399         Atom da;
 400
 401         XGetWindowProperty(dc->dpy, win, utf8, 0, sizeof text - cursor, True,
 402                            utf8, &da, &di, &dl, &dl, (unsigned char **)&p);
 403         insert(p, (q = strchr(p, '\n')) ? q-p : strlen(p));
 404         XFree(p);
 405         drawmenu();
 406 }
 407
 408 void
 409 readstdin(void) {
 410         char buf[sizeof text], *p;
 411         Item *item, *new;
 412
 413         allitems = NULL;
 414         for(item = NULL; fgets(buf, sizeof buf, stdin); item = new) {
 415                 if((p = strchr(buf, '\n')))
 416                         *p = '\0';
 417                 if(!(new = malloc(sizeof *new)))
 418                         eprintf("cannot malloc %u bytes\n", sizeof *new);
 419                 if(!(new->text = strdup(buf)))
 420                         eprintf("cannot strdup %u bytes\n", strlen(buf));
 421                 inputw = MAX(inputw, textw(dc, new->text));
 422                 new->next = new->left = new->right = NULL;
 423                 if(item)
 424                         item->next = new;
 425                 else
 426                         allitems = new;
 427         }
 428 }
 429
 430 void
 431 run(void) {
 432         XEvent ev;
 433
 434         while(!XNextEvent(dc->dpy, &ev))
 435                 switch(ev.type) {
 436                 case Expose:
 437                         if(ev.xexpose.count == 0)
 438                                 drawmenu();
 439                         break;
 440                 case KeyPress:
 441                         keypress(&ev.xkey);
 442                         break;
 443                 case SelectionNotify:
 444                         if(ev.xselection.property == utf8)
 445                                 paste();
 446                         break;
 447                 case VisibilityNotify:
 448                         if(ev.xvisibility.state != VisibilityUnobscured)
 449                                 XRaiseWindow(dc->dpy, win);
 450                         break;
 451                 }
 452 }
 453
 454 void
 455 setup(void) {
 456         int x, y, screen;
 457         XSetWindowAttributes wa;
 458 #ifdef XINERAMA
 459         int n;
 460         XineramaScreenInfo *info;
 461 #endif
 462
 463         screen = DefaultScreen(dc->dpy);
 464         root = RootWindow(dc->dpy, screen);
 465         utf8 = XInternAtom(dc->dpy, "UTF8_STRING", False);
 466
 467         normcol[ColBG] = getcolor(dc, normbgcolor);
 468         normcol[ColFG] = getcolor(dc, normfgcolor);
 469         selcol[ColBG] = getcolor(dc, selbgcolor);
 470         selcol[ColFG] = getcolor(dc, selfgcolor);
 471
 472         /* input window geometry */
 473         mh = (dc->font.height + 2) * (lines + 1);
 474 #ifdef XINERAMA
 475         if((info = XineramaQueryScreens(dc->dpy, &n))) {
 476                 int i, di;
 477                 unsigned int du;
 478                 Window dw;
 479
 480                 XQueryPointer(dc->dpy, root, &dw, &dw, &x, &y, &di, &di, &du);
 481                 for(i = 0; i < n; i++)
 482                         if(INRECT(x, y, info[i].x_org, info[i].y_org, info[i].width, info[i].height))
 483                                 break;
 484                 x = info[i].x_org;
 485                 y = info[i].y_org + (topbar ? 0 : info[i].height - mh);
 486                 mw = info[i].width;
 487                 XFree(info);
 488         }
 489         else
 490 #endif
 491         {
 492                 x = 0;
 493                 y = topbar ? 0 : DisplayHeight(dc->dpy, screen) - mh;
 494                 mw = DisplayWidth(dc->dpy, screen);
 495         }
 496
 497         /* input window */
 498         wa.override_redirect = True;
 499         wa.background_pixmap = ParentRelative;
 500         wa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
 501         win = XCreateWindow(dc->dpy, root, x, y, mw, mh, 0,
 502                         DefaultDepth(dc->dpy, screen), CopyFromParent,
 503                         DefaultVisual(dc->dpy, screen),
 504                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 505
 506         grabkeyboard();
 507         setcanvas(dc, win, mw, mh);
 508         inputw = MIN(inputw, mw/3);
 509         XMapRaised(dc->dpy, win);
 510         match();
 511 }
 512
 513 void
 514 usage(void) {
 515         fputs("usage: dmenu [-b] [-i] [-l lines] [-p prompt] [-fn font] [-nb color]\n"
 516               "             [-nf color] [-sb color] [-sf color] [-v]\n", stderr);
 517         exit(EXIT_FAILURE);
 518 }
 519
 520 int
 521 main(int argc, char *argv[]) {
 522         int i;
 523
 524         progname = "dmenu";
 525         dc = initdraw();
 526
 527         for(i = 1; i < argc; i++)
 528                 /* single flags */
 529                 if(!strcmp(argv[i], "-v")) {
 530                         fputs("dmenu-"VERSION", © 2006-2010 dmenu engineers, see LICENSE for details\n", stdout);
 531                         exit(EXIT_SUCCESS);
 532                 }
 533                 else if(!strcmp(argv[i], "-b"))
 534                         topbar = False;
 535                 else if(!strcmp(argv[i], "-i")) {
 536                         fstrncmp = strncasecmp;
 537                         fstrstr = cistrstr;
 538                 }
 539                 else if(i == argc-1)
 540                         usage();
 541                 /* double flags */
 542                 else if(!strcmp(argv[i], "-l")) {
 543                         if((lines = atoi(argv[++i])) > 0)
 544                                 calcoffsets = calcoffsetsv;
 545                 }
 546                 else if(!strcmp(argv[i], "-p"))
 547                         prompt = argv[++i];
 548                 else if(!strcmp(argv[i], "-fn"))
 549                         initfont(dc, argv[i++]);
 550                 else if(!strcmp(argv[i], "-nb"))
 551                         normbgcolor = argv[++i];
 552                 else if(!strcmp(argv[i], "-nf"))
 553                         normfgcolor = argv[++i];
 554                 else if(!strcmp(argv[i], "-sb"))
 555                         selbgcolor = argv[++i];
 556                 else if(!strcmp(argv[i], "-sf"))
 557                         selfgcolor = argv[++i];
 558                 else
 559                         usage();
 560
 561         readstdin();
 562         setup();
 563         run();
 564
 565         return EXIT_FAILURE;  /* should not reach */
 566 }