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