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