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 <strings.h>
   7 #include <unistd.h>
   8 #include <X11/Xlib.h>
   9 #include <X11/Xatom.h>
  10 #include <X11/Xutil.h>
  11 #ifdef XINERAMA
  12 #include <X11/extensions/Xinerama.h>
  13 #endif
  14 #include "draw.h"
  15
  16 #define INTERSECT(x,y,w,h,r)  (MAX(0, MIN((x)+(w),(r).x_org+(r).width)  - MAX((x),(r).x_org)) \
  17                              * MAX(0, MIN((y)+(h),(r).y_org+(r).height) - MAX((y),(r).y_org)))
  18 #define MIN(a,b)              ((a) < (b) ? (a) : (b))
  19 #define MAX(a,b)              ((a) > (b) ? (a) : (b))
  20
  21 typedef struct Item Item;
  22 struct Item {
  23         char *text;
  24         Item *left, *right;
  25         Bool out;
  26 };
  27
  28 static void appenditem(Item *item, Item **list, Item **last);
  29 static void calcoffsets(void);
  30 static char *cistrstr(const char *s, const char *sub);
  31 static void drawmenu(void);
  32 static void grabkeyboard(void);
  33 static void insert(const char *str, ssize_t n);
  34 static void keypress(XKeyEvent *ev);
  35 static void match(void);
  36 static size_t nextrune(int inc);
  37 static void paste(void);
  38 static void readstdin(void);
  39 static void run(void);
  40 static void setup(void);
  41 static void usage(void);
  42
  43 static char text[BUFSIZ] = "";
  44 static int bh, mw, mh;
  45 static int inputw, promptw;
  46 static size_t cursor = 0;
  47 static unsigned long normcol[ColLast];
  48 static unsigned long selcol[ColLast];
  49 static unsigned long outcol[ColLast];
  50 static Atom clip, utf8;
  51 static DC *dc;
  52 static Item *items = NULL;
  53 static Item *matches, *matchend;
  54 static Item *prev, *curr, *next, *sel;
  55 static Window win;
  56 static XIC xic;
  57 static int mon = -1;
  58
  59 #include "config.h"
  60
  61 static int (*fstrncmp)(const char *, const char *, size_t) = strncmp;
  62 static char *(*fstrstr)(const char *, const char *) = strstr;
  63
  64 int
  65 main(int argc, char *argv[]) {
  66         Bool fast = False;
  67         int i;
  68
  69         for(i = 1; i < argc; i++)
  70                 /* these options take no arguments */
  71                 if(!strcmp(argv[i], "-v")) {      /* prints version information */
  72                         puts("dmenu-"VERSION", © 2006-2012 dmenu engineers, see LICENSE for details");
  73                         exit(EXIT_SUCCESS);
  74                 }
  75                 else if(!strcmp(argv[i], "-b"))   /* appears at the bottom of the screen */
  76                         topbar = False;
  77                 else if(!strcmp(argv[i], "-f"))   /* grabs keyboard before reading stdin */
  78                         fast = True;
  79                 else if(!strcmp(argv[i], "-i")) { /* case-insensitive item matching */
  80                         fstrncmp = strncasecmp;
  81                         fstrstr = cistrstr;
  82                 }
  83                 else if(i+1 == argc)
  84                         usage();
  85                 /* these options take one argument */
  86                 else if(!strcmp(argv[i], "-l"))   /* number of lines in vertical list */
  87                         lines = atoi(argv[++i]);
  88                 else if(!strcmp(argv[i], "-m"))
  89                         mon = atoi(argv[++i]);
  90                 else if(!strcmp(argv[i], "-p"))   /* adds prompt to left of input field */
  91                         prompt = argv[++i];
  92                 else if(!strcmp(argv[i], "-fn"))  /* font or font set */
  93                         font = argv[++i];
  94                 else if(!strcmp(argv[i], "-nb"))  /* normal background color */
  95                         normbgcolor = argv[++i];
  96                 else if(!strcmp(argv[i], "-nf"))  /* normal foreground color */
  97                         normfgcolor = argv[++i];
  98                 else if(!strcmp(argv[i], "-sb"))  /* selected background color */
  99                         selbgcolor = argv[++i];
 100                 else if(!strcmp(argv[i], "-sf"))  /* selected foreground color */
 101                         selfgcolor = argv[++i];
 102                 else
 103                         usage();
 104
 105         dc = initdc();
 106         initfont(dc, font);
 107
 108         if(fast) {
 109                 grabkeyboard();
 110                 readstdin();
 111         }
 112         else {
 113                 readstdin();
 114                 grabkeyboard();
 115         }
 116         setup();
 117         run();
 118
 119         return 1; /* unreachable */
 120 }
 121
 122 void
 123 appenditem(Item *item, Item **list, Item **last) {
 124         if(*last)
 125                 (*last)->right = item;
 126         else
 127                 *list = item;
 128
 129         item->left = *last;
 130         item->right = NULL;
 131         *last = item;
 132 }
 133
 134 void
 135 calcoffsets(void) {
 136         int i, n;
 137
 138         if(lines > 0)
 139                 n = lines * bh;
 140         else
 141                 n = mw - (promptw + inputw + textw(dc, "<") + textw(dc, ">"));
 142         /* calculate which items will begin the next page and previous page */
 143         for(i = 0, next = curr; next; next = next->right)
 144                 if((i += (lines > 0) ? bh : MIN(textw(dc, next->text), n)) > n)
 145                         break;
 146         for(i = 0, prev = curr; prev && prev->left; prev = prev->left)
 147                 if((i += (lines > 0) ? bh : MIN(textw(dc, prev->left->text), n)) > n)
 148                         break;
 149 }
 150
 151 char *
 152 cistrstr(const char *s, const char *sub) {
 153         size_t len;
 154
 155         for(len = strlen(sub); *s; s++)
 156                 if(!strncasecmp(s, sub, len))
 157                         return (char *)s;
 158         return NULL;
 159 }
 160
 161 void
 162 drawmenu(void) {
 163         int curpos;
 164         Item *item;
 165
 166         dc->x = 0;
 167         dc->y = 0;
 168         dc->h = bh;
 169         drawrect(dc, 0, 0, mw, mh, True, BG(dc, normcol));
 170
 171         if(prompt && *prompt) {
 172                 dc->w = promptw;
 173                 drawtext(dc, prompt, selcol);
 174                 dc->x = dc->w;
 175         }
 176         /* draw input field */
 177         dc->w = (lines > 0 || !matches) ? mw - dc->x : inputw;
 178         drawtext(dc, text, normcol);
 179         if((curpos = textnw(dc, text, cursor) + dc->h/2 - 2) < dc->w)
 180                 drawrect(dc, curpos, 2, 1, dc->h - 4, True, FG(dc, normcol));
 181
 182         if(lines > 0) {
 183                 /* draw vertical list */
 184                 dc->w = mw - dc->x;
 185                 for(item = curr; item != next; item = item->right) {
 186                         dc->y += dc->h;
 187                         drawtext(dc, item->text, (item == sel) ? selcol :
 188                                                  (item->out)   ? outcol : normcol);
 189                 }
 190         }
 191         else if(matches) {
 192                 /* draw horizontal list */
 193                 dc->x += inputw;
 194                 dc->w = textw(dc, "<");
 195                 if(curr->left)
 196                         drawtext(dc, "<", normcol);
 197                 for(item = curr; item != next; item = item->right) {
 198                         dc->x += dc->w;
 199                         dc->w = MIN(textw(dc, item->text), mw - dc->x - textw(dc, ">"));
 200                         drawtext(dc, item->text, (item == sel) ? selcol :
 201                                                  (item->out)   ? outcol : normcol);
 202                 }
 203                 dc->w = textw(dc, ">");
 204                 dc->x = mw - dc->w;
 205                 if(next)
 206                         drawtext(dc, ">", normcol);
 207         }
 208         mapdc(dc, win, mw, mh);
 209 }
 210
 211 void
 212 grabkeyboard(void) {
 213         int i;
 214
 215         /* try to grab keyboard, we may have to wait for another process to ungrab */
 216         for(i = 0; i < 1000; i++) {
 217                 if(XGrabKeyboard(dc->dpy, DefaultRootWindow(dc->dpy), True,
 218                                  GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess)
 219                         return;
 220                 usleep(1000);
 221         }
 222         eprintf("cannot grab keyboard\n");
 223 }
 224
 225 void
 226 insert(const char *str, ssize_t n) {
 227         if(strlen(text) + n > sizeof text - 1)
 228                 return;
 229         /* move existing text out of the way, insert new text, and update cursor */
 230         memmove(&text[cursor + n], &text[cursor], sizeof text - cursor - MAX(n, 0));
 231         if(n > 0)
 232                 memcpy(&text[cursor], str, n);
 233         cursor += n;
 234         match();
 235 }
 236
 237 void
 238 keypress(XKeyEvent *ev) {
 239         char buf[32];
 240         int len;
 241         KeySym ksym = NoSymbol;
 242         Status status;
 243
 244         len = XmbLookupString(xic, ev, buf, sizeof buf, &ksym, &status);
 245         if(status == XBufferOverflow)
 246                 return;
 247         if(ev->state & ControlMask)
 248                 switch(ksym) {
 249                 case XK_a: ksym = XK_Home;      break;
 250                 case XK_b: ksym = XK_Left;      break;
 251                 case XK_c: ksym = XK_Escape;    break;
 252                 case XK_d: ksym = XK_Delete;    break;
 253                 case XK_e: ksym = XK_End;       break;
 254                 case XK_f: ksym = XK_Right;     break;
 255                 case XK_g: ksym = XK_Escape;    break;
 256                 case XK_h: ksym = XK_BackSpace; break;
 257                 case XK_i: ksym = XK_Tab;       break;
 258                 case XK_j: /* fallthrough */
 259                 case XK_J: ksym = XK_Return;    break;
 260                 case XK_m: /* fallthrough */
 261                 case XK_M: ksym = XK_Return;    break;
 262                 case XK_n: ksym = XK_Down;      break;
 263                 case XK_p: ksym = XK_Up;        break;
 264
 265                 case XK_k: /* delete right */
 266                         text[cursor] = '\0';
 267                         match();
 268                         break;
 269                 case XK_u: /* delete left */
 270                         insert(NULL, 0 - cursor);
 271                         break;
 272                 case XK_w: /* delete word */
 273                         while(cursor > 0 && text[nextrune(-1)] == ' ')
 274                                 insert(NULL, nextrune(-1) - cursor);
 275                         while(cursor > 0 && text[nextrune(-1)] != ' ')
 276                                 insert(NULL, nextrune(-1) - cursor);
 277                         break;
 278                 case XK_y: /* paste selection */
 279                         XConvertSelection(dc->dpy, (ev->state & ShiftMask) ? clip : XA_PRIMARY,
 280                                           utf8, utf8, win, CurrentTime);
 281                         return;
 282                 case XK_Return:
 283                 case XK_KP_Enter:
 284                         break;
 285                 case XK_bracketleft:
 286                         exit(EXIT_FAILURE);
 287                 default:
 288                         return;
 289                 }
 290         else if(ev->state & Mod1Mask)
 291                 switch(ksym) {
 292                 case XK_g: ksym = XK_Home;  break;
 293                 case XK_G: ksym = XK_End;   break;
 294                 case XK_h: ksym = XK_Up;    break;
 295                 case XK_j: ksym = XK_Next;  break;
 296                 case XK_k: ksym = XK_Prior; break;
 297                 case XK_l: ksym = XK_Down;  break;
 298                 default:
 299                         return;
 300                 }
 301         switch(ksym) {
 302         default:
 303                 if(!iscntrl(*buf))
 304                         insert(buf, len);
 305                 break;
 306         case XK_Delete:
 307                 if(text[cursor] == '\0')
 308                         return;
 309                 cursor = nextrune(+1);
 310                 /* fallthrough */
 311         case XK_BackSpace:
 312                 if(cursor == 0)
 313                         return;
 314                 insert(NULL, nextrune(-1) - cursor);
 315                 break;
 316         case XK_End:
 317                 if(text[cursor] != '\0') {
 318                         cursor = strlen(text);
 319                         break;
 320                 }
 321                 if(next) {
 322                         /* jump to end of list and position items in reverse */
 323                         curr = matchend;
 324                         calcoffsets();
 325                         curr = prev;
 326                         calcoffsets();
 327                         while(next && (curr = curr->right))
 328                                 calcoffsets();
 329                 }
 330                 sel = matchend;
 331                 break;
 332         case XK_Escape:
 333                 exit(EXIT_FAILURE);
 334         case XK_Home:
 335                 if(sel == matches) {
 336                         cursor = 0;
 337                         break;
 338                 }
 339                 sel = curr = matches;
 340                 calcoffsets();
 341                 break;
 342         case XK_Left:
 343                 if(cursor > 0 && (!sel || !sel->left || lines > 0)) {
 344                         cursor = nextrune(-1);
 345                         break;
 346                 }
 347                 if(lines > 0)
 348                         return;
 349                 /* fallthrough */
 350         case XK_Up:
 351                 if(sel && sel->left && (sel = sel->left)->right == curr) {
 352                         curr = prev;
 353                         calcoffsets();
 354                 }
 355                 break;
 356         case XK_Next:
 357                 if(!next)
 358                         return;
 359                 sel = curr = next;
 360                 calcoffsets();
 361                 break;
 362         case XK_Prior:
 363                 if(!prev)
 364                         return;
 365                 sel = curr = prev;
 366                 calcoffsets();
 367                 break;
 368         case XK_Return:
 369         case XK_KP_Enter:
 370                 puts((sel && !(ev->state & ShiftMask)) ? sel->text : text);
 371                 if(!(ev->state & ControlMask))
 372                         exit(EXIT_SUCCESS);
 373                 sel->out = True;
 374                 break;
 375         case XK_Right:
 376                 if(text[cursor] != '\0') {
 377                         cursor = nextrune(+1);
 378                         break;
 379                 }
 380                 if(lines > 0)
 381                         return;
 382                 /* fallthrough */
 383         case XK_Down:
 384                 if(sel && sel->right && (sel = sel->right) == next) {
 385                         curr = next;
 386                         calcoffsets();
 387                 }
 388                 break;
 389         case XK_Tab:
 390                 if(!sel)
 391                         return;
 392                 strncpy(text, sel->text, sizeof text - 1);
 393                 text[sizeof text - 1] = '\0';
 394                 cursor = strlen(text);
 395                 match();
 396                 break;
 397         }
 398         drawmenu();
 399 }
 400
 401 void
 402 match(void) {
 403         static char **tokv = NULL;
 404         static int tokn = 0;
 405
 406         char buf[sizeof text], *s;
 407         int i, tokc = 0;
 408         size_t len;
 409         Item *item, *lprefix, *lsubstr, *prefixend, *substrend;
 410
 411         strcpy(buf, text);
 412         /* separate input text into tokens to be matched individually */
 413         for(s = strtok(buf, " "); s; tokv[tokc-1] = s, s = strtok(NULL, " "))
 414                 if(++tokc > tokn && !(tokv = realloc(tokv, ++tokn * sizeof *tokv)))
 415                         eprintf("cannot realloc %u bytes\n", tokn * sizeof *tokv);
 416         len = tokc ? strlen(tokv[0]) : 0;
 417
 418         matches = lprefix = lsubstr = matchend = prefixend = substrend = NULL;
 419         for(item = items; item && item->text; item++) {
 420                 for(i = 0; i < tokc; i++)
 421                         if(!fstrstr(item->text, tokv[i]))
 422                                 break;
 423                 if(i != tokc) /* not all tokens match */
 424                         continue;
 425                 /* exact matches go first, then prefixes, then substrings */
 426                 if(!tokc || !fstrncmp(tokv[0], item->text, len+1))
 427                         appenditem(item, &matches, &matchend);
 428                 else if(!fstrncmp(tokv[0], item->text, len))
 429                         appenditem(item, &lprefix, &prefixend);
 430                 else
 431                         appenditem(item, &lsubstr, &substrend);
 432         }
 433         if(lprefix) {
 434                 if(matches) {
 435                         matchend->right = lprefix;
 436                         lprefix->left = matchend;
 437                 }
 438                 else
 439                         matches = lprefix;
 440                 matchend = prefixend;
 441         }
 442         if(lsubstr) {
 443                 if(matches) {
 444                         matchend->right = lsubstr;
 445                         lsubstr->left = matchend;
 446                 }
 447                 else
 448                         matches = lsubstr;
 449                 matchend = substrend;
 450         }
 451         curr = sel = matches;
 452         calcoffsets();
 453 }
 454
 455 size_t
 456 nextrune(int inc) {
 457         ssize_t n;
 458
 459         /* return location of next utf8 rune in the given direction (+1 or -1) */
 460         for(n = cursor + inc; n + inc >= 0 && (text[n] & 0xc0) == 0x80; n += inc);
 461         return n;
 462 }
 463
 464 void
 465 paste(void) {
 466         char *p, *q;
 467         int di;
 468         unsigned long dl;
 469         Atom da;
 470
 471         /* we have been given the current selection, now insert it into input */
 472         XGetWindowProperty(dc->dpy, win, utf8, 0, (sizeof text / 4) + 1, False,
 473                            utf8, &da, &di, &dl, &dl, (unsigned char **)&p);
 474         insert(p, (q = strchr(p, '\n')) ? q-p : (ssize_t)strlen(p));
 475         XFree(p);
 476         drawmenu();
 477 }
 478
 479 void
 480 readstdin(void) {
 481         char buf[sizeof text], *p, *maxstr = NULL;
 482         size_t i, max = 0, size = 0;
 483
 484         /* read each line from stdin and add it to the item list */
 485         for(i = 0; fgets(buf, sizeof buf, stdin); i++) {
 486                 if(i+1 >= size / sizeof *items)
 487                         if(!(items = realloc(items, (size += BUFSIZ))))
 488                                 eprintf("cannot realloc %u bytes:", size);
 489                 if((p = strchr(buf, '\n')))
 490                         *p = '\0';
 491                 if(!(items[i].text = strdup(buf)))
 492                         eprintf("cannot strdup %u bytes:", strlen(buf)+1);
 493                 items[i].out = False;
 494                 if(strlen(items[i].text) > max)
 495                         max = strlen(maxstr = items[i].text);
 496         }
 497         if(items)
 498                 items[i].text = NULL;
 499         inputw = maxstr ? textw(dc, maxstr) : 0;
 500         lines = MIN(lines, i);
 501 }
 502
 503 void
 504 run(void) {
 505         XEvent ev;
 506
 507         while(!XNextEvent(dc->dpy, &ev)) {
 508                 if(XFilterEvent(&ev, win))
 509                         continue;
 510                 switch(ev.type) {
 511                 case Expose:
 512                         if(ev.xexpose.count == 0)
 513                                 mapdc(dc, win, mw, mh);
 514                         break;
 515                 case KeyPress:
 516                         keypress(&ev.xkey);
 517                         break;
 518                 case SelectionNotify:
 519                         if(ev.xselection.property == utf8)
 520                                 paste();
 521                         break;
 522                 case VisibilityNotify:
 523                         if(ev.xvisibility.state != VisibilityUnobscured)
 524                                 XRaiseWindow(dc->dpy, win);
 525                         break;
 526                 }
 527         }
 528 }
 529
 530 void
 531 setup(void) {
 532         int x, y, screen = DefaultScreen(dc->dpy);
 533         Window root = RootWindow(dc->dpy, screen);
 534         XSetWindowAttributes swa;
 535         XIM xim;
 536 #ifdef XINERAMA
 537         int n;
 538         XineramaScreenInfo *info;
 539 #endif
 540
 541         normcol[ColBG] = getcolor(dc, normbgcolor);
 542         normcol[ColFG] = getcolor(dc, normfgcolor);
 543         selcol[ColBG]  = getcolor(dc, selbgcolor);
 544         selcol[ColFG]  = getcolor(dc, selfgcolor);
 545         outcol[ColBG]  = getcolor(dc, outbgcolor);
 546         outcol[ColFG]  = getcolor(dc, outfgcolor);
 547
 548         clip = XInternAtom(dc->dpy, "CLIPBOARD",   False);
 549         utf8 = XInternAtom(dc->dpy, "UTF8_STRING", False);
 550
 551         /* calculate menu geometry */
 552         bh = dc->font.height + 2;
 553         lines = MAX(lines, 0);
 554         mh = (lines + 1) * bh;
 555 #ifdef XINERAMA
 556         if((info = XineramaQueryScreens(dc->dpy, &n))) {
 557                 int a, j, di, i = 0, area = 0;
 558                 unsigned int du;
 559                 Window w, pw, dw, *dws;
 560                 XWindowAttributes wa;
 561
 562                 XGetInputFocus(dc->dpy, &w, &di);
 563                 if(mon != -1 && mon < n)
 564                         i = mon;
 565                 if(!i && w != root && w != PointerRoot && w != None) {
 566                         /* find top-level window containing current input focus */
 567                         do {
 568                                 if(XQueryTree(dc->dpy, (pw = w), &dw, &w, &dws, &du) && dws)
 569                                         XFree(dws);
 570                         } while(w != root && w != pw);
 571                         /* find xinerama screen with which the window intersects most */
 572                         if(XGetWindowAttributes(dc->dpy, pw, &wa))
 573                                 for(j = 0; j < n; j++)
 574                                         if((a = INTERSECT(wa.x, wa.y, wa.width, wa.height, info[j])) > area) {
 575                                                 area = a;
 576                                                 i = j;
 577                                         }
 578                 }
 579                 /* no focused window is on screen, so use pointer location instead */
 580                 if(mon == -1 && !area && XQueryPointer(dc->dpy, root, &dw, &dw, &x, &y, &di, &di, &du))
 581                         for(i = 0; i < n; i++)
 582                                 if(INTERSECT(x, y, 1, 1, info[i]))
 583                                         break;
 584
 585                 x = info[i].x_org;
 586                 y = info[i].y_org + (topbar ? 0 : info[i].height - mh);
 587                 mw = info[i].width;
 588                 XFree(info);
 589         }
 590         else
 591 #endif
 592         {
 593                 x = 0;
 594                 y = topbar ? 0 : DisplayHeight(dc->dpy, screen) - mh;
 595                 mw = DisplayWidth(dc->dpy, screen);
 596         }
 597         promptw = (prompt && *prompt) ? textw(dc, prompt) : 0;
 598         inputw = MIN(inputw, mw/3);
 599         match();
 600
 601         /* create menu window */
 602         swa.override_redirect = True;
 603         swa.background_pixel = normcol[ColBG];
 604         swa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
 605         win = XCreateWindow(dc->dpy, root, x, y, mw, mh, 0,
 606                             DefaultDepth(dc->dpy, screen), CopyFromParent,
 607                             DefaultVisual(dc->dpy, screen),
 608                             CWOverrideRedirect | CWBackPixel | CWEventMask, &swa);
 609
 610         /* open input methods */
 611         xim = XOpenIM(dc->dpy, NULL, NULL, NULL);
 612         xic = XCreateIC(xim, XNInputStyle, XIMPreeditNothing | XIMStatusNothing,
 613                         XNClientWindow, win, XNFocusWindow, win, NULL);
 614
 615         XMapRaised(dc->dpy, win);
 616         resizedc(dc, mw, mh);
 617         drawmenu();
 618 }
 619
 620 void
 621 usage(void) {
 622         fputs("usage: dmenu [-b] [-f] [-i] [-l lines] [-p prompt] [-fn font] [-m monitor]\n"
 623               "             [-nb color] [-nf color] [-sb color] [-sf color] [-v]\n", stderr);
 624         exit(EXIT_FAILURE);
 625 }