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
 113         dc->h = dc->font.height + 2;
 114         dc->y = topbar ? 0 : mh - dc->h;
 115         /* print prompt? */
 116         if(prompt) {
 117                 dc->w = promptw;
 118                 drawtext(dc, prompt, selcol);
 119                 dc->x = dc->w;
 120         }
 121         dc->w = mw - dc->x;
 122         /* print input field */
 123         if(matches && lines == 0 && textw(dc, text) <= inputw)
 124                 dc->w = inputw;
 125         drawtext(dc, text, normcol);
 126         drawrect(dc, textnw(dc, text, cursor) + dc->h/2 - 2, 2, 1, dc->h - 4, FG(dc, normcol));
 127
 128         if(lines > 0) {
 129                 dc->y = topbar ? dc->h : 0;
 130                 dc->w = mw - dc->x;
 131                 for(item = curr; item != next; item = item->right) {
 132                         drawtext(dc, item->text, (item == sel) ? selcol : normcol);
 133                         dc->y += dc->h;
 134                 }
 135         }
 136         else if(curr && (dc->w == inputw || curr->next)) {
 137                 dc->x += inputw;
 138                 dc->w = textw(dc, "<");
 139                 if(curr->left)
 140                         drawtext(dc, "<", normcol);
 141                 for(item = curr; item != next; item = item->right) {
 142                         dc->x += dc->w;
 143                         dc->w = MIN(textw(dc, item->text), mw/3);
 144                         drawtext(dc, item->text, (item == sel) ? selcol : normcol);
 145                 }
 146                 dc->w = textw(dc, ">");
 147                 dc->x = mw - dc->w;
 148                 if(next)
 149                         drawtext(dc, ">", normcol);
 150         }
 151         commitdraw(dc, win);
 152 }
 153
 154 void
 155 grabkeyboard(void) {
 156         int i;
 157
 158         for(i = 0; i < 1000; i++) {
 159                 if(!XGrabKeyboard(dc->dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime))
 160                         return;
 161                 usleep(1000);
 162         }
 163         eprintf("cannot grab keyboard\n");
 164 }
 165
 166 void
 167 insert(const char *s, ssize_t n) {
 168         memmove(text + cursor + n, text + cursor, sizeof text - cursor - n);
 169         if(n > 0)
 170                 memcpy(text + cursor, s, n);
 171         cursor += n;
 172         match();
 173 }
 174
 175 void
 176 keypress(XKeyEvent *e) {
 177         char buf[sizeof text];
 178         int n;
 179         size_t len;
 180         KeySym ksym;
 181
 182         len = strlen(text);
 183         XLookupString(e, buf, sizeof buf, &ksym, NULL);
 184         if(e->state & ControlMask) {
 185                 switch(tolower(ksym)) {
 186                 default:
 187                         return;
 188                 case XK_a:
 189                         ksym = XK_Home;
 190                         break;
 191                 case XK_b:
 192                         ksym = XK_Left;
 193                         break;
 194                 case XK_c:
 195                         ksym = XK_Escape;
 196                         break;
 197                 case XK_d:
 198                         ksym = XK_Delete;
 199                         break;
 200                 case XK_e:
 201                         ksym = XK_End;
 202                         break;
 203                 case XK_f:
 204                         ksym = XK_Right;
 205                         break;
 206                 case XK_h:
 207                         ksym = XK_BackSpace;
 208                         break;
 209                 case XK_i:
 210                         ksym = XK_Tab;
 211                         break;
 212                 case XK_j:
 213                         ksym = XK_Return;
 214                         break;
 215                 case XK_k:  /* delete right */
 216                         text[cursor] = '\0';
 217                         match();
 218                         break;
 219                 case XK_n:
 220                         ksym = XK_Down;
 221                         break;
 222                 case XK_p:
 223                         ksym = XK_Up;
 224                         break;
 225                 case XK_u:  /* delete left */
 226                         insert(NULL, -cursor);
 227                         break;
 228                 case XK_w:  /* delete word */
 229                         if(cursor == 0)
 230                                 return;
 231                         n = 0;
 232                         while(cursor - n++ > 0 && text[cursor - n] == ' ');
 233                         while(cursor - n++ > 0 && text[cursor - n] != ' ');
 234                         insert(NULL, 1-n);
 235                         break;
 236                 case XK_y:  /* paste selection */
 237                         XConvertSelection(dc->dpy, XA_PRIMARY, utf8, None, win, CurrentTime);
 238                         /* causes SelectionNotify event */
 239                         return;
 240                 }
 241         }
 242         switch(ksym) {
 243         default:
 244                 if(!iscntrl((int)*buf))
 245                         insert(buf, MIN(strlen(buf), sizeof text - cursor));
 246                 break;
 247         case XK_BackSpace:
 248                 if(cursor == 0)
 249                         return;
 250                 for(n = 1; cursor - n > 0 && !UTF8_CODEPOINT(text[cursor - n]); n++);
 251                 insert(NULL, -n);
 252                 break;
 253         case XK_Delete:
 254                 if(cursor == len)
 255                         return;
 256                 for(n = 1; cursor + n < len && !UTF8_CODEPOINT(text[cursor + n]); n++);
 257                 cursor += n;
 258                 insert(NULL, -n);
 259                 break;
 260         case XK_End:
 261                 if(cursor < len) {
 262                         cursor = len;
 263                         break;
 264                 }
 265                 while(next) {
 266                         sel = curr = next;
 267                         calcoffsets();
 268                 }
 269                 while(sel && sel->right)
 270                         sel = sel->right;
 271                 break;
 272         case XK_Escape:
 273                 exit(EXIT_FAILURE);
 274         case XK_Home:
 275                 if(sel == matches) {
 276                         cursor = 0;
 277                         break;
 278                 }
 279                 sel = curr = matches;
 280                 calcoffsets();
 281                 break;
 282         case XK_Left:
 283                 if(cursor > 0 && (!sel || !sel->left || lines > 0)) {
 284                         while(cursor-- > 0 && !UTF8_CODEPOINT(text[cursor]));
 285                         break;
 286                 }
 287                 else if(lines > 0)
 288                         return;
 289         case XK_Up:
 290                 if(!sel || !sel->left)
 291                         return;
 292                 sel = sel->left;
 293                 if(sel->right == curr) {
 294                         curr = prev;
 295                         calcoffsets();
 296                 }
 297                 break;
 298         case XK_Next:
 299                 if(!next)
 300                         return;
 301                 sel = curr = next;
 302                 calcoffsets();
 303                 break;
 304         case XK_Prior:
 305                 if(!prev)
 306                         return;
 307                 sel = curr = prev;
 308                 calcoffsets();
 309                 break;
 310         case XK_Return:
 311         case XK_KP_Enter:
 312                 fputs((sel && !(e->state & ShiftMask)) ? sel->text : text, stdout);
 313                 fflush(stdout);
 314                 exit(EXIT_SUCCESS);
 315         case XK_Right:
 316                 if(cursor < len) {
 317                         while(cursor++ < len && !UTF8_CODEPOINT(text[cursor]));
 318                         break;
 319                 }
 320                 else if(lines > 0)
 321                         return;
 322         case XK_Down:
 323                 if(!sel || !sel->right)
 324                         return;
 325                 sel = sel->right;
 326                 if(sel == next) {
 327                         curr = next;
 328                         calcoffsets();
 329                 }
 330                 break;
 331         case XK_Tab:
 332                 if(!sel)
 333                         return;
 334                 strncpy(text, sel->text, sizeof text);
 335                 cursor = strlen(text);
 336                 match();
 337                 break;
 338         }
 339         drawmenu();
 340 }
 341
 342 void
 343 match(void) {
 344         size_t len;
 345         Item *item, *itemend, *lexact, *lprefix, *lsubstr, *exactend, *prefixend, *substrend;
 346
 347         len = strlen(text);
 348         matches = lexact = lprefix = lsubstr = itemend = exactend = prefixend = substrend = NULL;
 349         for(item = allitems; item; item = item->next)
 350                 if(!fstrncmp(text, item->text, len + 1))
 351                         appenditem(item, &lexact, &exactend);
 352                 else if(!fstrncmp(text, item->text, len))
 353                         appenditem(item, &lprefix, &prefixend);
 354                 else if(fstrstr(item->text, text))
 355                         appenditem(item, &lsubstr, &substrend);
 356         if(lexact) {
 357                 matches = lexact;
 358                 itemend = exactend;
 359         }
 360         if(lprefix) {
 361                 if(itemend) {
 362                         itemend->right = lprefix;
 363                         lprefix->left = itemend;
 364                 }
 365                 else
 366                         matches = lprefix;
 367                 itemend = prefixend;
 368         }
 369         if(lsubstr) {
 370                 if(itemend) {
 371                         itemend->right = lsubstr;
 372                         lsubstr->left = itemend;
 373                 }
 374                 else
 375                         matches = lsubstr;
 376         }
 377         curr = prev = next = sel = matches;
 378         calcoffsets();
 379 }
 380
 381 void
 382 paste(void) {
 383         char *p, *q;
 384         int di;
 385         unsigned long dl;
 386         Atom da;
 387
 388         XGetWindowProperty(dc->dpy, win, utf8, 0, sizeof text - cursor, True,
 389                            utf8, &da, &di, &dl, &dl, (unsigned char **)&p);
 390         insert(p, (q = strchr(p, '\n')) ? q-p : strlen(p));
 391         XFree(p);
 392         drawmenu();
 393 }
 394
 395 void
 396 readstdin(void) {
 397         char buf[sizeof text], *p;
 398         Item *item, *new;
 399
 400         allitems = NULL;
 401         for(item = NULL; fgets(buf, sizeof buf, stdin); item = new) {
 402                 if((p = strchr(buf, '\n')))
 403                         *p = '\0';
 404                 if(!(new = malloc(sizeof *new)))
 405                         eprintf("cannot malloc %u bytes\n", sizeof *new);
 406                 if(!(new->text = strdup(buf)))
 407                         eprintf("cannot strdup %u bytes\n", strlen(buf));
 408                 inputw = MAX(inputw, textw(dc, new->text));
 409                 new->next = new->left = new->right = NULL;
 410                 if(item)
 411                         item->next = new;
 412                 else
 413                         allitems = new;
 414         }
 415 }
 416
 417 void
 418 run(void) {
 419         XEvent ev;
 420
 421         while(!XNextEvent(dc->dpy, &ev))
 422                 switch(ev.type) {
 423                 case Expose:
 424                         if(ev.xexpose.count == 0)
 425                                 drawmenu();
 426                         break;
 427                 case KeyPress:
 428                         keypress(&ev.xkey);
 429                         break;
 430                 case SelectionNotify:
 431                         if(ev.xselection.property == utf8)
 432                                 paste();
 433                         break;
 434                 case VisibilityNotify:
 435                         if(ev.xvisibility.state != VisibilityUnobscured)
 436                                 XRaiseWindow(dc->dpy, win);
 437                         break;
 438                 }
 439 }
 440
 441 void
 442 setup(void) {
 443         int x, y, screen;
 444         XSetWindowAttributes wa;
 445 #ifdef XINERAMA
 446         int n;
 447         XineramaScreenInfo *info;
 448 #endif
 449
 450         screen = DefaultScreen(dc->dpy);
 451         root = RootWindow(dc->dpy, screen);
 452         utf8 = XInternAtom(dc->dpy, "UTF8_STRING", False);
 453
 454         normcol[ColBG] = getcolor(dc, normbgcolor);
 455         normcol[ColFG] = getcolor(dc, normfgcolor);
 456         selcol[ColBG] = getcolor(dc, selbgcolor);
 457         selcol[ColFG] = getcolor(dc, selfgcolor);
 458
 459         /* menu geometry */
 460         mh = (dc->font.height + 2) * (lines + 1);
 461 #ifdef XINERAMA
 462         if((info = XineramaQueryScreens(dc->dpy, &n))) {
 463                 int i, di;
 464                 unsigned int du;
 465                 Window dw;
 466
 467                 XQueryPointer(dc->dpy, root, &dw, &dw, &x, &y, &di, &di, &du);
 468                 for(i = 0; i < n; i++)
 469                         if(INRECT(x, y, info[i].x_org, info[i].y_org, info[i].width, info[i].height))
 470                                 break;
 471                 x = info[i].x_org;
 472                 y = info[i].y_org + (topbar ? 0 : info[i].height - mh);
 473                 mw = info[i].width;
 474                 XFree(info);
 475         }
 476         else
 477 #endif
 478         {
 479                 x = 0;
 480                 y = topbar ? 0 : DisplayHeight(dc->dpy, screen) - mh;
 481                 mw = DisplayWidth(dc->dpy, screen);
 482         }
 483         /* menu window */
 484         wa.override_redirect = True;
 485         wa.background_pixmap = ParentRelative;
 486         wa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
 487         win = XCreateWindow(dc->dpy, root, x, y, mw, mh, 0,
 488                         DefaultDepth(dc->dpy, screen), CopyFromParent,
 489                         DefaultVisual(dc->dpy, screen),
 490                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 491
 492         grabkeyboard();
 493         setcanvas(dc, mw, mh);
 494         inputw = MIN(inputw, mw/3);
 495         promptw = prompt ? MIN(textw(dc, prompt), mw/5) : 0;
 496         XMapRaised(dc->dpy, win);
 497         text[0] = '\0';
 498         match();
 499 }
 500
 501 void
 502 usage(void) {
 503         fputs("usage: dmenu [-b] [-i] [-l lines] [-p prompt] [-fn font] [-nb color]\n"
 504               "             [-nf color] [-sb color] [-sf color] [-v]\n", stderr);
 505         exit(EXIT_FAILURE);
 506 }
 507
 508 int
 509 main(int argc, char *argv[]) {
 510         int i;
 511
 512         progname = "dmenu";
 513         dc = initdraw();
 514
 515         for(i = 1; i < argc; i++)
 516                 /* single flags */
 517                 if(!strcmp(argv[i], "-v")) {
 518                         fputs("dmenu-"VERSION", © 2006-2010 dmenu engineers, see LICENSE for details\n", stdout);
 519                         exit(EXIT_SUCCESS);
 520                 }
 521                 else if(!strcmp(argv[i], "-b"))
 522                         topbar = False;
 523                 else if(!strcmp(argv[i], "-i")) {
 524                         fstrncmp = strncasecmp;
 525                         fstrstr = cistrstr;
 526                 }
 527                 else if(i == argc-1)
 528                         usage();
 529                 /* double flags */
 530                 else if(!strcmp(argv[i], "-l"))
 531                         lines = atoi(argv[++i]);
 532                 else if(!strcmp(argv[i], "-p"))
 533                         prompt = argv[++i];
 534                 else if(!strcmp(argv[i], "-fn"))
 535                         initfont(dc, argv[++i]);
 536                 else if(!strcmp(argv[i], "-nb"))
 537                         normbgcolor = argv[++i];
 538                 else if(!strcmp(argv[i], "-nf"))
 539                         normfgcolor = argv[++i];
 540                 else if(!strcmp(argv[i], "-sb"))
 541                         selbgcolor = argv[++i];
 542                 else if(!strcmp(argv[i], "-sf"))
 543                         selfgcolor = argv[++i];
 544                 else
 545                         usage();
 546
 547         readstdin();
 548         setup();
 549         run();
 550
 551         return EXIT_FAILURE;  /* should not reach */
 552 }