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 };
  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 *str, ssize_t n);
  33 static void keypress(XKeyEvent *ev);
  34 static void match(void);
  35 static size_t nextrune(int inc);
  36 static void paste(void);
  37 static void readstdin(void);
  38 static void run(void);
  39 static void setup(void);
  40 static void usage(void);
  41
  42 static char text[BUFSIZ] = "";
  43 static int bh, mw, mh;
  44 static int inputw, promptw;
  45 static size_t cursor = 0;
  46 static const char *font = NULL;
  47 static const char *prompt = NULL;
  48 static const char *normbgcolor = "#cccccc";
  49 static const char *normfgcolor = "#000000";
  50 static const char *selbgcolor  = "#0066ff";
  51 static const char *selfgcolor  = "#ffffff";
  52 static unsigned int lines = 0;
  53 static unsigned long normcol[ColLast];
  54 static unsigned long selcol[ColLast];
  55 static Atom utf8;
  56 static Bool topbar = True;
  57 static DC *dc;
  58 static Item *items = NULL;
  59 static Item *matches, *matchend;
  60 static Item *prev, *curr, *next, *sel;
  61 static Window win;
  62 static XIC xic;
  63
  64 static int (*fstrncmp)(const char *, const char *, size_t) = strncmp;
  65 static char *(*fstrstr)(const char *, const char *) = strstr;
  66
  67 int
  68 main(int argc, char *argv[]) {
  69         Bool fast = False;
  70         int i;
  71
  72         for(i = 1; i < argc; i++)
  73                 /* these options take no arguments */
  74                 if(!strcmp(argv[i], "-v")) {      /* prints version information */
  75                         puts("dmenu-"VERSION", © 2006-2011 dmenu engineers, see LICENSE for details");
  76                         exit(EXIT_SUCCESS);
  77                 }
  78                 else if(!strcmp(argv[i], "-b"))   /* appears at the bottom of the screen */
  79                         topbar = False;
  80                 else if(!strcmp(argv[i], "-f"))   /* grabs keyboard before reading stdin */
  81                         fast = True;
  82                 else if(!strcmp(argv[i], "-i")) { /* case-insensitive item matching */
  83                         fstrncmp = strncasecmp;
  84                         fstrstr = cistrstr;
  85                 }
  86                 else if(i+1 == argc)
  87                         usage();
  88                 /* these options take one argument */
  89                 else if(!strcmp(argv[i], "-l"))   /* number of lines in vertical list */
  90                         lines = atoi(argv[++i]);
  91                 else if(!strcmp(argv[i], "-p"))   /* adds prompt to left of input field */
  92                         prompt = argv[++i];
  93                 else if(!strcmp(argv[i], "-fn"))  /* font or font set */
  94                         font = argv[++i];
  95                 else if(!strcmp(argv[i], "-nb"))  /* normal background color */
  96                         normbgcolor = argv[++i];
  97                 else if(!strcmp(argv[i], "-nf"))  /* normal foreground color */
  98                         normfgcolor = argv[++i];
  99                 else if(!strcmp(argv[i], "-sb"))  /* selected background color */
 100                         selbgcolor = argv[++i];
 101                 else if(!strcmp(argv[i], "-sf"))  /* selected foreground color */
 102                         selfgcolor = argv[++i];
 103                 else
 104                         usage();
 105
 106         dc = initdc();
 107         initfont(dc, font);
 108
 109         if(fast) {
 110                 grabkeyboard();
 111                 readstdin();
 112         }
 113         else {
 114                 readstdin();
 115                 grabkeyboard();
 116         }
 117         setup();
 118         run();
 119
 120         return EXIT_FAILURE; /* unreachable */
 121 }
 122
 123 void
 124 appenditem(Item *item, Item **list, Item **last) {
 125         if(*last)
 126                 (*last)->right = item;
 127         else
 128                 *list = item;
 129
 130         item->left = *last;
 131         item->right = NULL;
 132         *last = item;
 133 }
 134
 135 void
 136 calcoffsets(void) {
 137         int i, n;
 138
 139         if(lines > 0)
 140                 n = lines * bh;
 141         else
 142                 n = mw - (promptw + inputw + textw(dc, "<") + textw(dc, ">"));
 143         /* calculate which items will begin the next page and previous page */
 144         for(i = 0, next = curr; next; next = next->right)
 145                 if((i += (lines > 0) ? bh : MIN(textw(dc, next->text), n)) > n)
 146                         break;
 147         for(i = 0, prev = curr; prev && prev->left; prev = prev->left)
 148                 if((i += (lines > 0) ? bh : MIN(textw(dc, prev->left->text), n)) > n)
 149                         break;
 150 }
 151
 152 char *
 153 cistrstr(const char *s, const char *sub) {
 154         size_t len;
 155
 156         for(len = strlen(sub); *s; s++)
 157                 if(!strncasecmp(s, sub, len))
 158                         return (char *)s;
 159         return NULL;
 160 }
 161
 162 void
 163 drawmenu(void) {
 164         int curpos;
 165         Item *item;
 166
 167         dc->x = 0;
 168         dc->y = 0;
 169         dc->h = bh;
 170         drawrect(dc, 0, 0, mw, mh, True, BG(dc, normcol));
 171
 172         if(prompt) {
 173                 dc->w = promptw;
 174                 drawtext(dc, prompt, selcol);
 175                 dc->x = dc->w;
 176         }
 177         /* draw input field */
 178         dc->w = (lines > 0 || !matches) ? mw - dc->x : inputw;
 179         drawtext(dc, text, normcol);
 180         if((curpos = textnw(dc, text, cursor) + dc->h/2 - 2) < dc->w)
 181                 drawrect(dc, curpos, 2, 1, dc->h - 4, True, FG(dc, normcol));
 182
 183         if(lines > 0) {
 184                 /* draw vertical list */
 185                 dc->w = mw - dc->x;
 186                 for(item = curr; item != next; item = item->right) {
 187                         dc->y += dc->h;
 188                         drawtext(dc, item->text, (item == sel) ? selcol : 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 : normcol);
 201                 }
 202                 dc->w = textw(dc, ">");
 203                 dc->x = mw - dc->w;
 204                 if(next)
 205                         drawtext(dc, ">", normcol);
 206         }
 207         mapdc(dc, win, mw, mh);
 208 }
 209
 210 void
 211 grabkeyboard(void) {
 212         int i;
 213
 214         /* try to grab keyboard, we may have to wait for another process to ungrab */
 215         for(i = 0; i < 1000; i++) {
 216                 if(XGrabKeyboard(dc->dpy, DefaultRootWindow(dc->dpy), True,
 217                                  GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess)
 218                         return;
 219                 usleep(1000);
 220         }
 221         eprintf("cannot grab keyboard\n");
 222 }
 223
 224 void
 225 insert(const char *str, ssize_t n) {
 226         if(strlen(text) + n > sizeof text - 1)
 227                 return;
 228         /* move existing text out of the way, insert new text, and update cursor */
 229         memmove(&text[cursor + n], &text[cursor], sizeof text - cursor - MAX(n, 0));
 230         if(n > 0)
 231                 memcpy(&text[cursor], str, n);
 232         cursor += n;
 233         match();
 234 }
 235
 236 void
 237 keypress(XKeyEvent *ev) {
 238         char buf[32];
 239         int len;
 240         KeySym ksym = NoSymbol;
 241         Status status;
 242
 243         len = XmbLookupString(xic, ev, buf, sizeof buf, &ksym, &status);
 244         if(status == XBufferOverflow)
 245                 return;
 246         if(ev->state & ControlMask) {
 247                 KeySym lower, upper;
 248
 249                 XConvertCase(ksym, &lower, &upper);
 250                 switch(lower) {
 251                 case XK_a: ksym = XK_Home;      break;
 252                 case XK_b: ksym = XK_Left;      break;
 253                 case XK_c: ksym = XK_Escape;    break;
 254                 case XK_d: ksym = XK_Delete;    break;
 255                 case XK_e: ksym = XK_End;       break;
 256                 case XK_f: ksym = XK_Right;     break;
 257                 case XK_h: ksym = XK_BackSpace; break;
 258                 case XK_i: ksym = XK_Tab;       break;
 259                 case XK_j: ksym = XK_Return;    break;
 260                 case XK_m: ksym = XK_Return;    break;
 261                 case XK_n: ksym = XK_Up;        break;
 262                 case XK_p: ksym = XK_Down;      break;
 263
 264                 case XK_k: /* delete right */
 265                         text[cursor] = '\0';
 266                         match();
 267                         break;
 268                 case XK_u: /* delete left */
 269                         insert(NULL, 0 - cursor);
 270                         break;
 271                 case XK_w: /* delete word */
 272                         while(cursor > 0 && text[nextrune(-1)] == ' ')
 273                                 insert(NULL, nextrune(-1) - cursor);
 274                         while(cursor > 0 && text[nextrune(-1)] != ' ')
 275                                 insert(NULL, nextrune(-1) - cursor);
 276                         break;
 277                 case XK_y: /* paste selection */
 278                         XConvertSelection(dc->dpy, XA_PRIMARY, utf8, utf8, win, CurrentTime);
 279                         return;
 280                 default:
 281                         return;
 282                 }
 283         }
 284         switch(ksym) {
 285         default:
 286                 if(!iscntrl(*buf))
 287                         insert(buf, len);
 288                 break;
 289         case XK_Delete:
 290                 if(text[cursor] == '\0')
 291                         return;
 292                 cursor = nextrune(+1);
 293                 /* fallthrough */
 294         case XK_BackSpace:
 295                 if(cursor == 0)
 296                         return;
 297                 insert(NULL, nextrune(-1) - cursor);
 298                 break;
 299         case XK_End:
 300                 if(text[cursor] != '\0') {
 301                         cursor = strlen(text);
 302                         break;
 303                 }
 304                 if(next) {
 305                         /* jump to end of list and position items in reverse */
 306                         curr = matchend;
 307                         calcoffsets();
 308                         curr = prev;
 309                         calcoffsets();
 310                         while(next && (curr = curr->right))
 311                                 calcoffsets();
 312                 }
 313                 sel = matchend;
 314                 break;
 315         case XK_Escape:
 316                 exit(EXIT_FAILURE);
 317         case XK_Home:
 318                 if(sel == matches) {
 319                         cursor = 0;
 320                         break;
 321                 }
 322                 sel = curr = matches;
 323                 calcoffsets();
 324                 break;
 325         case XK_Left:
 326                 if(cursor > 0 && (!sel || !sel->left || lines > 0)) {
 327                         cursor = nextrune(-1);
 328                         break;
 329                 }
 330                 /* fallthrough */
 331         case XK_Up:
 332                 if(sel && sel->left && (sel = sel->left)->right == curr) {
 333                         curr = prev;
 334                         calcoffsets();
 335                 }
 336                 break;
 337         case XK_Next:
 338                 if(!next)
 339                         return;
 340                 sel = curr = next;
 341                 calcoffsets();
 342                 break;
 343         case XK_Prior:
 344                 if(!prev)
 345                         return;
 346                 sel = curr = prev;
 347                 calcoffsets();
 348                 break;
 349         case XK_Return:
 350         case XK_KP_Enter:
 351                 puts((sel && !(ev->state & ShiftMask)) ? sel->text : text);
 352                 exit(EXIT_SUCCESS);
 353         case XK_Right:
 354                 if(text[cursor] != '\0') {
 355                         cursor = nextrune(+1);
 356                         break;
 357                 }
 358                 /* fallthrough */
 359         case XK_Down:
 360                 if(sel && sel->right && (sel = sel->right) == next) {
 361                         curr = next;
 362                         calcoffsets();
 363                 }
 364                 break;
 365         case XK_Tab:
 366                 if(!sel)
 367                         return;
 368                 strncpy(text, sel->text, sizeof text);
 369                 cursor = strlen(text);
 370                 match();
 371                 break;
 372         }
 373         drawmenu();
 374 }
 375
 376 void
 377 match(void) {
 378         static char **tokv = NULL;
 379         static int tokn = 0;
 380
 381         char buf[sizeof text], *s;
 382         int i, tokc = 0;
 383         size_t len;
 384         Item *item, *lprefix, *lsubstr, *prefixend, *substrend;
 385
 386         strcpy(buf, text);
 387         /* separate input text into tokens to be matched individually */
 388         for(s = strtok(buf, " "); s; tokv[tokc-1] = s, s = strtok(NULL, " "))
 389                 if(++tokc > tokn && !(tokv = realloc(tokv, ++tokn * sizeof *tokv)))
 390                         eprintf("cannot realloc %u bytes\n", tokn * sizeof *tokv);
 391         len = tokc ? strlen(tokv[0]) : 0;
 392
 393         matches = lprefix = lsubstr = matchend = prefixend = substrend = NULL;
 394         for(item = items; item && item->text; item++) {
 395                 for(i = 0; i < tokc; i++)
 396                         if(!fstrstr(item->text, tokv[i]))
 397                                 break;
 398                 if(i != tokc) /* not all tokens match */
 399                         continue;
 400                 /* exact matches go first, then prefixes, then substrings */
 401                 if(!tokc || !fstrncmp(tokv[0], item->text, len+1))
 402                         appenditem(item, &matches, &matchend);
 403                 else if(!fstrncmp(tokv[0], item->text, len))
 404                         appenditem(item, &lprefix, &prefixend);
 405                 else
 406                         appenditem(item, &lsubstr, &substrend);
 407         }
 408         if(lprefix) {
 409                 if(matches) {
 410                         matchend->right = lprefix;
 411                         lprefix->left = matchend;
 412                 }
 413                 else
 414                         matches = lprefix;
 415                 matchend = prefixend;
 416         }
 417         if(lsubstr) {
 418                 if(matches) {
 419                         matchend->right = lsubstr;
 420                         lsubstr->left = matchend;
 421                 }
 422                 else
 423                         matches = lsubstr;
 424                 matchend = substrend;
 425         }
 426         curr = sel = matches;
 427         calcoffsets();
 428 }
 429
 430 size_t
 431 nextrune(int inc) {
 432         ssize_t n;
 433
 434         /* return location of next utf8 rune in the given direction (+1 or -1) */
 435         for(n = cursor + inc; n + inc >= 0 && (text[n] & 0xc0) == 0x80; n += inc);
 436         return n;
 437 }
 438
 439 void
 440 paste(void) {
 441         char *p, *q;
 442         int di;
 443         unsigned long dl;
 444         Atom da;
 445
 446         /* we have been given the current selection, now insert it into input */
 447         XGetWindowProperty(dc->dpy, win, utf8, 0, (sizeof text / 4) + 1, False,
 448                            utf8, &da, &di, &dl, &dl, (unsigned char **)&p);
 449         insert(p, (q = strchr(p, '\n')) ? q-p : (ssize_t)strlen(p));
 450         XFree(p);
 451         drawmenu();
 452 }
 453
 454 void
 455 readstdin(void) {
 456         char buf[sizeof text], *p, *maxstr = NULL;
 457         size_t i, max = 0, size = 0;
 458
 459         /* read each line from stdin and add it to the item list */
 460         for(i = 0; fgets(buf, sizeof buf, stdin); i++) {
 461                 if(i+1 >= size / sizeof *items)
 462                         if(!(items = realloc(items, (size += BUFSIZ))))
 463                                 eprintf("cannot realloc %u bytes:", size);
 464                 if((p = strchr(buf, '\n')))
 465                         *p = '\0';
 466                 if(!(items[i].text = strdup(buf)))
 467                         eprintf("cannot strdup %u bytes:", strlen(buf)+1);
 468                 if(strlen(items[i].text) > max)
 469                         max = strlen(maxstr = items[i].text);
 470         }
 471         if(items)
 472                 items[i].text = NULL;
 473         inputw = maxstr ? textw(dc, maxstr) : 0;
 474         lines = MIN(lines, i);
 475 }
 476
 477 void
 478 run(void) {
 479         XEvent ev;
 480
 481         while(!XNextEvent(dc->dpy, &ev)) {
 482                 if(XFilterEvent(&ev, win))
 483                         continue;
 484                 switch(ev.type) {
 485                 case Expose:
 486                         if(ev.xexpose.count == 0)
 487                                 mapdc(dc, win, mw, mh);
 488                         break;
 489                 case KeyPress:
 490                         keypress(&ev.xkey);
 491                         break;
 492                 case SelectionNotify:
 493                         if(ev.xselection.property == utf8)
 494                                 paste();
 495                         break;
 496                 case VisibilityNotify:
 497                         if(ev.xvisibility.state != VisibilityUnobscured)
 498                                 XRaiseWindow(dc->dpy, win);
 499                         break;
 500                 }
 501         }
 502 }
 503
 504 void
 505 setup(void) {
 506         int x, y, screen = DefaultScreen(dc->dpy);
 507         Window root = RootWindow(dc->dpy, screen);
 508         XSetWindowAttributes swa;
 509         XIM xim;
 510 #ifdef XINERAMA
 511         int n;
 512         XineramaScreenInfo *info;
 513 #endif
 514
 515         normcol[ColBG] = getcolor(dc, normbgcolor);
 516         normcol[ColFG] = getcolor(dc, normfgcolor);
 517         selcol[ColBG]  = getcolor(dc, selbgcolor);
 518         selcol[ColFG]  = getcolor(dc, selfgcolor);
 519
 520         utf8 = XInternAtom(dc->dpy, "UTF8_STRING", False);
 521
 522         /* calculate menu geometry */
 523         bh = dc->font.height + 2;
 524         lines = MAX(lines, 0);
 525         mh = (lines + 1) * bh;
 526 #ifdef XINERAMA
 527         if((info = XineramaQueryScreens(dc->dpy, &n))) {
 528                 int a, j, di, i = 0, area = 0;
 529                 unsigned int du;
 530                 Window w, pw, dw, *dws;
 531                 XWindowAttributes wa;
 532
 533                 XGetInputFocus(dc->dpy, &w, &di);
 534                 if(w != root && w != PointerRoot && w != None) {
 535                         /* find top-level window containing current input focus */
 536                         do {
 537                                 if(XQueryTree(dc->dpy, (pw = w), &dw, &w, &dws, &du) && dws)
 538                                         XFree(dws);
 539                         } while(w != root && w != pw);
 540                         /* find xinerama screen with which the window intersects most */
 541                         if(XGetWindowAttributes(dc->dpy, pw, &wa))
 542                                 for(j = 0; j < n; j++)
 543                                         if((a = INTERSECT(wa.x, wa.y, wa.width, wa.height, info[j])) > area) {
 544                                                 area = a;
 545                                                 i = j;
 546                                         }
 547                 }
 548                 /* no focused window is on screen, so use pointer location instead */
 549                 if(!area && XQueryPointer(dc->dpy, root, &dw, &dw, &x, &y, &di, &di, &du))
 550                         for(i = 0; i < n; i++)
 551                                 if(INTERSECT(x, y, 1, 1, info[i]))
 552                                         break;
 553
 554                 x = info[i].x_org;
 555                 y = info[i].y_org + (topbar ? 0 : info[i].height - mh);
 556                 mw = info[i].width;
 557                 XFree(info);
 558         }
 559         else
 560 #endif
 561         {
 562                 x = 0;
 563                 y = topbar ? 0 : DisplayHeight(dc->dpy, screen) - mh;
 564                 mw = DisplayWidth(dc->dpy, screen);
 565         }
 566         promptw = prompt ? textw(dc, prompt) : 0;
 567         inputw = MIN(inputw, mw/3);
 568         match();
 569
 570         /* create menu window */
 571         swa.override_redirect = True;
 572         swa.background_pixmap = ParentRelative;
 573         swa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
 574         win = XCreateWindow(dc->dpy, root, x, y, mw, mh, 0,
 575                             DefaultDepth(dc->dpy, screen), CopyFromParent,
 576                             DefaultVisual(dc->dpy, screen),
 577                             CWOverrideRedirect | CWBackPixmap | CWEventMask, &swa);
 578
 579         /* open input methods */
 580         xim = XOpenIM(dc->dpy, NULL, NULL, NULL);
 581         xic = XCreateIC(xim, XNInputStyle, XIMPreeditNothing | XIMStatusNothing,
 582                         XNClientWindow, win, XNFocusWindow, win, NULL);
 583
 584         XMapRaised(dc->dpy, win);
 585         resizedc(dc, mw, mh);
 586         drawmenu();
 587 }
 588
 589 void
 590 usage(void) {
 591         fputs("usage: dmenu [-b] [-f] [-i] [-l lines] [-p prompt] [-fn font]\n"
 592               "             [-nb color] [-nf color] [-sb color] [-sf color] [-v]\n", stderr);
 593         exit(EXIT_FAILURE);
 594 }