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/Xlib.h>
   8 #include <X11/Xatom.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 LINEH                   (dc->font.height + 2)
  17 #define MIN(a,b)                ((a) < (b) ? (a) : (b))
  18 #define MAX(a,b)                ((a) > (b) ? (a) : (b))
  19 #define UTF8_CODEPOINT(c)       (((c) & 0xc0) != 0x80)
  20
  21 typedef struct Item Item;
  22 struct Item {
  23         char *text;
  24         Item *next;          /* traverses all items */
  25         Item *left, *right;  /* traverses matching items */
  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 *s, ssize_t n);
  34 static void keypress(XKeyEvent *ev);
  35 static void match(void);
  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 size_t cursor = 0;
  44 static const char *prompt = NULL;
  45 static const char *normbgcolor = "#cccccc";
  46 static const char *normfgcolor = "#000000";
  47 static const char *selbgcolor  = "#0066ff";
  48 static const char *selfgcolor  = "#ffffff";
  49 static unsigned int inputw = 0;
  50 static unsigned int lines = 0;
  51 static unsigned int mw, mh;
  52 static unsigned int promptw;
  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 *allitems, *matches;
  59 static Item *curr, *prev, *next, *sel;
  60 static Window root, win;
  61
  62 static int (*fstrncmp)(const char *, const char *, size_t) = strncmp;
  63 static char *(*fstrstr)(const char *, const char *) = strstr;
  64
  65 void
  66 appenditem(Item *item, Item **list, Item **last) {
  67         if(!*last)
  68                 *list = item;
  69         else
  70                 (*last)->right = item;
  71         item->left = *last;
  72         item->right = NULL;
  73         *last = item;
  74 }
  75
  76 void
  77 calcoffsets(void) {
  78         unsigned int i, n;
  79
  80         if(lines > 0)
  81                 n = lines * LINEH;
  82         else
  83                 n = mw - (promptw + inputw + textw(dc, "<") + textw(dc, ">"));
  84
  85         for(i = 0, next = curr; i <= n && next; next = next->right)
  86                 i += (lines > 0) ? LINEH : MIN(textw(dc, next->text), mw/3);
  87
  88         for(i = 0, prev = curr; i <= n && prev && prev->left; prev = prev->left)
  89                 i += (lines > 0) ? LINEH : MIN(textw(dc, prev->left->text), mw/3);
  90 }
  91
  92 char *
  93 cistrstr(const char *s, const char *sub) {
  94         size_t len;
  95
  96         for(len = strlen(sub); *s; s++)
  97                 if(!strncasecmp(s, sub, len))
  98                         return (char *)s;
  99         return NULL;
 100 }
 101
 102 void
 103 drawmenu(void) {
 104         int curpos;
 105         Item *item;
 106
 107         dc->x = 0;
 108         dc->y = 0;
 109         dc->h = LINEH;
 110         drawrect(dc, 0, 0, mw, mh, BG(dc, normcol));
 111
 112         if(prompt) {
 113                 dc->w = promptw;
 114                 drawtext(dc, prompt, selcol);
 115                 dc->x = dc->w;
 116         }
 117         dc->w = (lines > 0 || !matches) ? mw - dc->x : inputw;
 118         drawtext(dc, text, normcol);
 119         if((curpos = textnw(dc, text, cursor) + dc->h/2 - 2) < dc->w)
 120                 drawrect(dc, curpos, 2, 1, dc->h - 4, FG(dc, normcol));
 121
 122         if(lines > 0) {
 123                 dc->w = mw - dc->x;
 124                 for(item = curr; item != next; item = item->right) {
 125                         dc->y += dc->h;
 126                         drawtext(dc, item->text, (item == sel) ? selcol : normcol);
 127                 }
 128         }
 129         else if(matches) {
 130                 dc->x += inputw;
 131                 dc->w = textw(dc, "<");
 132                 if(curr->left)
 133                         drawtext(dc, "<", normcol);
 134                 for(item = curr; item != next; item = item->right) {
 135                         dc->x += dc->w;
 136                         dc->w = MIN(textw(dc, item->text), mw/3);
 137                         drawtext(dc, item->text, (item == sel) ? selcol : normcol);
 138                 }
 139                 dc->w = textw(dc, ">");
 140                 dc->x = mw - dc->w;
 141                 if(next)
 142                         drawtext(dc, ">", normcol);
 143         }
 144         commitdraw(dc, win);
 145 }
 146
 147 void
 148 grabkeyboard(void) {
 149         int i;
 150
 151         for(i = 0; i < 1000; i++) {
 152                 if(!XGrabKeyboard(dc->dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime))
 153                         return;
 154                 usleep(1000);
 155         }
 156         eprintf("cannot grab keyboard\n");
 157 }
 158
 159 void
 160 insert(const char *s, ssize_t n) {
 161         memmove(text + cursor + n, text + cursor, sizeof text - cursor - n);
 162         if(n > 0)
 163                 memcpy(text + cursor, s, n);
 164         cursor += n;
 165         match();
 166 }
 167
 168 void
 169 keypress(XKeyEvent *ev) {
 170         char buf[32];
 171         int n;
 172         size_t len;
 173         KeySym ksym;
 174
 175         len = strlen(text);
 176         XLookupString(ev, buf, sizeof buf, &ksym, NULL);
 177         if(ev->state & ControlMask) {
 178                 switch(tolower(ksym)) {
 179                 default:
 180                         return;
 181                 case XK_a:
 182                         ksym = XK_Home;
 183                         break;
 184                 case XK_b:
 185                         ksym = XK_Left;
 186                         break;
 187                 case XK_c:
 188                         ksym = XK_Escape;
 189                         break;
 190                 case XK_d:
 191                         ksym = XK_Delete;
 192                         break;
 193                 case XK_e:
 194                         ksym = XK_End;
 195                         break;
 196                 case XK_f:
 197                         ksym = XK_Right;
 198                         break;
 199                 case XK_h:
 200                         ksym = XK_BackSpace;
 201                         break;
 202                 case XK_i:
 203                         ksym = XK_Tab;
 204                         break;
 205                 case XK_j:
 206                         ksym = XK_Return;
 207                         break;
 208                 case XK_k:  /* delete right */
 209                         text[cursor] = '\0';
 210                         match();
 211                         break;
 212                 case XK_n:
 213                         ksym = XK_Down;
 214                         break;
 215                 case XK_p:
 216                         ksym = XK_Up;
 217                         break;
 218                 case XK_u:  /* delete left */
 219                         insert(NULL, -cursor);
 220                         break;
 221                 case XK_w:  /* delete word */
 222                         if(cursor == 0)
 223                                 return;
 224                         n = 0;
 225                         while(cursor - n++ > 0 && text[cursor - n] == ' ');
 226                         while(cursor - n++ > 0 && text[cursor - n] != ' ');
 227                         insert(NULL, 1-n);
 228                         break;
 229                 case XK_y:  /* paste selection */
 230                         XConvertSelection(dc->dpy, XA_PRIMARY, utf8, None, win, CurrentTime);
 231                         return;
 232                 }
 233         }
 234         switch(ksym) {
 235         default:
 236                 if(isprint(*buf))
 237                         insert(buf, MIN(strlen(buf), sizeof text - cursor));
 238                 break;
 239         case XK_BackSpace:
 240                 if(cursor == 0)
 241                         return;
 242                 for(n = 1; cursor - n > 0 && !UTF8_CODEPOINT(text[cursor - n]); n++);
 243                 insert(NULL, -n);
 244                 break;
 245         case XK_Delete:
 246                 if(cursor == len)
 247                         return;
 248                 for(n = 1; cursor + n < len && !UTF8_CODEPOINT(text[cursor + n]); n++);
 249                 cursor += n;
 250                 insert(NULL, -n);
 251                 break;
 252         case XK_End:
 253                 if(cursor < len) {
 254                         cursor = len;
 255                         break;
 256                 }
 257                 while(next) {
 258                         sel = curr = next;
 259                         calcoffsets();
 260                 }
 261                 while(sel && sel->right)
 262                         sel = sel->right;
 263                 break;
 264         case XK_Escape:
 265                 exit(EXIT_FAILURE);
 266         case XK_Home:
 267                 if(sel == matches) {
 268                         cursor = 0;
 269                         break;
 270                 }
 271                 sel = curr = matches;
 272                 calcoffsets();
 273                 break;
 274         case XK_Left:
 275                 if(cursor > 0 && (!sel || !sel->left || lines > 0)) {
 276                         while(cursor-- > 0 && !UTF8_CODEPOINT(text[cursor]));
 277                         break;
 278                 }
 279                 else if(lines > 0)
 280                         return;
 281         case XK_Up:
 282                 if(!sel || !sel->left)
 283                         return;
 284                 if((sel = sel->left)->right == curr) {
 285                         curr = prev;
 286                         calcoffsets();
 287                 }
 288                 break;
 289         case XK_Next:
 290                 if(!next)
 291                         return;
 292                 sel = curr = next;
 293                 calcoffsets();
 294                 break;
 295         case XK_Prior:
 296                 if(!prev)
 297                         return;
 298                 sel = curr = prev;
 299                 calcoffsets();
 300                 break;
 301         case XK_Return:
 302         case XK_KP_Enter:
 303                 fputs((sel && !(ev->state & ShiftMask)) ? sel->text : text, stdout);
 304                 fflush(stdout);
 305                 exit(EXIT_SUCCESS);
 306         case XK_Right:
 307                 if(cursor < len) {
 308                         while(cursor++ < len && !UTF8_CODEPOINT(text[cursor]));
 309                         break;
 310                 }
 311                 else if(lines > 0)
 312                         return;
 313         case XK_Down:
 314                 if(!sel || !sel->right)
 315                         return;
 316                 if((sel = sel->right) == next) {
 317                         curr = next;
 318                         calcoffsets();
 319                 }
 320                 break;
 321         case XK_Tab:
 322                 if(!sel)
 323                         return;
 324                 strncpy(text, sel->text, sizeof text);
 325                 cursor = strlen(text);
 326                 match();
 327                 break;
 328         }
 329         drawmenu();
 330 }
 331
 332 void
 333 match(void) {
 334         size_t len;
 335         Item *item, *itemend, *lexact, *lprefix, *lsubstr, *exactend, *prefixend, *substrend;
 336
 337         len = strlen(text);
 338         matches = lexact = lprefix = lsubstr = itemend = exactend = prefixend = substrend = NULL;
 339         for(item = allitems; item; item = item->next)
 340                 if(!fstrncmp(text, item->text, len + 1))
 341                         appenditem(item, &lexact, &exactend);
 342                 else if(!fstrncmp(text, item->text, len))
 343                         appenditem(item, &lprefix, &prefixend);
 344                 else if(fstrstr(item->text, text))
 345                         appenditem(item, &lsubstr, &substrend);
 346         if(lexact) {
 347                 matches = lexact;
 348                 itemend = exactend;
 349         }
 350         if(lprefix) {
 351                 if(itemend) {
 352                         itemend->right = lprefix;
 353                         lprefix->left = itemend;
 354                 }
 355                 else
 356                         matches = lprefix;
 357                 itemend = prefixend;
 358         }
 359         if(lsubstr) {
 360                 if(itemend) {
 361                         itemend->right = lsubstr;
 362                         lsubstr->left = itemend;
 363                 }
 364                 else
 365                         matches = lsubstr;
 366         }
 367         curr = prev = next = sel = matches;
 368         calcoffsets();
 369 }
 370
 371 void
 372 paste(void) {
 373         char *p, *q;
 374         int di;
 375         unsigned long dl;
 376         Atom da;
 377
 378         XGetWindowProperty(dc->dpy, win, utf8, 0, sizeof text - cursor, True,
 379                            utf8, &da, &di, &dl, &dl, (unsigned char **)&p);
 380         insert(p, (q = strchr(p, '\n')) ? q-p : strlen(p));
 381         XFree(p);
 382         drawmenu();
 383 }
 384
 385 void
 386 readstdin(void) {
 387         char buf[sizeof text], *p;
 388         Item *item, *new;
 389
 390         allitems = NULL;
 391         for(item = NULL; fgets(buf, sizeof buf, stdin); item = new) {
 392                 if((p = strchr(buf, '\n')))
 393                         *p = '\0';
 394                 if(!(new = malloc(sizeof *new)))
 395                         eprintf("cannot malloc %u bytes\n", sizeof *new);
 396                 if(!(new->text = strdup(buf)))
 397                         eprintf("cannot strdup %u bytes\n", strlen(buf)+1);
 398                 inputw = MAX(inputw, textw(dc, new->text));
 399                 new->next = new->left = new->right = NULL;
 400                 if(item)
 401                         item->next = new;
 402                 else
 403                         allitems = new;
 404         }
 405 }
 406
 407 void
 408 run(void) {
 409         XEvent ev;
 410
 411         while(!XNextEvent(dc->dpy, &ev))
 412                 switch(ev.type) {
 413                 case Expose:
 414                         if(ev.xexpose.count == 0)
 415                                 drawmenu();
 416                         break;
 417                 case KeyPress:
 418                         keypress(&ev.xkey);
 419                         break;
 420                 case SelectionNotify:
 421                         if(ev.xselection.property == utf8)
 422                                 paste();
 423                         break;
 424                 case VisibilityNotify:
 425                         if(ev.xvisibility.state != VisibilityUnobscured)
 426                                 XRaiseWindow(dc->dpy, win);
 427                         break;
 428                 }
 429 }
 430
 431 void
 432 setup(void) {
 433         int x, y, screen;
 434         XSetWindowAttributes wa;
 435 #ifdef XINERAMA
 436         int n;
 437         XineramaScreenInfo *info;
 438 #endif
 439
 440         screen = DefaultScreen(dc->dpy);
 441         root = RootWindow(dc->dpy, screen);
 442         utf8 = XInternAtom(dc->dpy, "UTF8_STRING", False);
 443
 444         normcol[ColBG] = getcolor(dc, normbgcolor);
 445         normcol[ColFG] = getcolor(dc, normfgcolor);
 446         selcol[ColBG] = getcolor(dc, selbgcolor);
 447         selcol[ColFG] = getcolor(dc, selfgcolor);
 448
 449         /* menu geometry */
 450         mh = (lines + 1) * LINEH;
 451 #ifdef XINERAMA
 452         if((info = XineramaQueryScreens(dc->dpy, &n))) {
 453                 int i, di;
 454                 unsigned int du;
 455                 Window dw;
 456
 457                 XQueryPointer(dc->dpy, root, &dw, &dw, &x, &y, &di, &di, &du);
 458                 for(i = 0; i < n; i++)
 459                         if(INRECT(x, y, info[i].x_org, info[i].y_org, info[i].width, info[i].height))
 460                                 break;
 461                 x = info[i].x_org;
 462                 y = info[i].y_org + (topbar ? 0 : info[i].height - mh);
 463                 mw = info[i].width;
 464                 XFree(info);
 465         }
 466         else
 467 #endif
 468         {
 469                 x = 0;
 470                 y = topbar ? 0 : DisplayHeight(dc->dpy, screen) - mh;
 471                 mw = DisplayWidth(dc->dpy, screen);
 472         }
 473         /* menu window */
 474         wa.override_redirect = True;
 475         wa.background_pixmap = ParentRelative;
 476         wa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
 477         win = XCreateWindow(dc->dpy, root, x, y, mw, mh, 0,
 478                             DefaultDepth(dc->dpy, screen), CopyFromParent,
 479                             DefaultVisual(dc->dpy, screen),
 480                             CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 481
 482         grabkeyboard();
 483         setcanvas(dc, mw, mh);
 484         inputw = MIN(inputw, mw/3);
 485         promptw = prompt ? MIN(textw(dc, prompt), mw/5) : 0;
 486         XMapRaised(dc->dpy, win);
 487         text[0] = '\0';
 488         match();
 489 }
 490
 491 void
 492 usage(void) {
 493         fputs("usage: dmenu [-b] [-i] [-l lines] [-p prompt] [-fn font] [-nb color]\n"
 494               "             [-nf color] [-sb color] [-sf color] [-v]\n", stderr);
 495         exit(EXIT_FAILURE);
 496 }
 497
 498 int
 499 main(int argc, char *argv[]) {
 500         int i;
 501
 502         progname = "dmenu";
 503         dc = initdraw();
 504
 505         for(i = 1; i < argc; i++)
 506                 /* single flags */
 507                 if(!strcmp(argv[i], "-v")) {
 508                         fputs("dmenu-"VERSION", © 2006-2010 dmenu engineers, see LICENSE for details\n", stdout);
 509                         exit(EXIT_SUCCESS);
 510                 }
 511                 else if(!strcmp(argv[i], "-b"))
 512                         topbar = False;
 513                 else if(!strcmp(argv[i], "-i")) {
 514                         fstrncmp = strncasecmp;
 515                         fstrstr = cistrstr;
 516                 }
 517                 else if(i == argc-1)
 518                         usage();
 519                 /* double flags */
 520                 else if(!strcmp(argv[i], "-l"))
 521                         lines = atoi(argv[++i]);
 522                 else if(!strcmp(argv[i], "-p"))
 523                         prompt = argv[++i];
 524                 else if(!strcmp(argv[i], "-fn"))
 525                         initfont(dc, argv[++i]);
 526                 else if(!strcmp(argv[i], "-nb"))
 527                         normbgcolor = argv[++i];
 528                 else if(!strcmp(argv[i], "-nf"))
 529                         normfgcolor = argv[++i];
 530                 else if(!strcmp(argv[i], "-sb"))
 531                         selbgcolor = argv[++i];
 532                 else if(!strcmp(argv[i], "-sf"))
 533                         selfgcolor = argv[++i];
 534                 else
 535                         usage();
 536
 537         readstdin();
 538         setup();
 539         run();
 540
 541         return EXIT_FAILURE;  /* should not reach */
 542 }