dmenu.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <ctype.h>
   3 #include <locale.h>
   4 #include <stdarg.h>
   5 #include <stdlib.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include <unistd.h>
   9 #include <X11/Xlib.h>
  10 #include <X11/Xutil.h>
  11 #include <X11/keysym.h>
  12
  13 /* macros */
  14 #define CLEANMASK(mask) (mask & ~(numlockmask | LockMask))
  15
  16 /* enums */
  17 enum { ColFG, ColBG, ColLast };
  18
  19 /* typedefs */
  20 typedef struct {
  21         int x, y, w, h;
  22         unsigned long norm[ColLast];
  23         unsigned long sel[ColLast];
  24         Drawable drawable;
  25         GC gc;
  26         struct {
  27                 XFontStruct *xfont;
  28                 XFontSet set;
  29                 int ascent;
  30                 int descent;
  31                 int height;
  32         } font;
  33 } DC; /* draw context */
  34
  35 typedef struct Item Item;
  36 struct Item {
  37         Item *next;             /* traverses all items */
  38         Item *left, *right;     /* traverses items matching current search pattern */
  39         char *text;
  40 };
  41
  42 /* forward declarations */
  43 void calcoffsets(void);
  44 void cleanup(void);
  45 void drawmenu(void);
  46 void drawtext(const char *text, unsigned long col[ColLast]);
  47 void *emalloc(unsigned int size);
  48 void eprint(const char *errstr, ...);
  49 char *estrdup(const char *str);
  50 unsigned long getcolor(const char *colstr);
  51 Bool grabkeyboard(void);
  52 void initfont(const char *fontstr);
  53 void kpress(XKeyEvent * e);
  54 void match(char *pattern);
  55 void readstdin(void);
  56 void run(void);
  57 void setup(Bool bottom);
  58 int strido(const char *text, const char *pattern);
  59 unsigned int textnw(const char *text, unsigned int len);
  60 unsigned int textw(const char *text);
  61
  62 #include "config.h"
  63
  64 /* variables */
  65 char *font = FONT;
  66 char *maxname = NULL;
  67 char *normbg = NORMBGCOLOR;
  68 char *normfg = NORMFGCOLOR;
  69 char *prompt = NULL;
  70 char *selbg = SELBGCOLOR;
  71 char *selfg = SELFGCOLOR;
  72 char text[4096];
  73 int screen;
  74 int ret = 0;
  75 unsigned int cmdw = 0;
  76 unsigned int mw, mh;
  77 unsigned int promptw = 0;
  78 unsigned int nitem = 0;
  79 unsigned int numlockmask = 0;
  80 Bool running = True;
  81 Display *dpy;
  82 DC dc = {0};
  83 Item *allitems = NULL;  /* first of all items */
  84 Item *item = NULL;      /* first of pattern matching items */
  85 Item *sel = NULL;
  86 Item *next = NULL;
  87 Item *prev = NULL;
  88 Item *curr = NULL;
  89 Window root, win;
  90
  91 void
  92 calcoffsets(void) {
  93         unsigned int tw, w;
  94
  95         if(!curr)
  96                 return;
  97         w = promptw + cmdw + 2 * SPACE;
  98         for(next = curr; next; next=next->right) {
  99                 tw = textw(next->text);
 100                 if(tw > mw / 3)
 101                         tw = mw / 3;
 102                 w += tw;
 103                 if(w > mw)
 104                         break;
 105         }
 106         w = promptw + cmdw + 2 * SPACE;
 107         for(prev = curr; prev && prev->left; prev=prev->left) {
 108                 tw = textw(prev->left->text);
 109                 if(tw > mw / 3)
 110                         tw = mw / 3;
 111                 w += tw;
 112                 if(w > mw)
 113                         break;
 114         }
 115 }
 116
 117 void
 118 cleanup(void) {
 119         Item *itm;
 120
 121         while(allitems) {
 122                 itm = allitems->next;
 123                 free(allitems->text);
 124                 free(allitems);
 125                 allitems = itm;
 126         }
 127         if(dc.font.set)
 128                 XFreeFontSet(dpy, dc.font.set);
 129         else
 130                 XFreeFont(dpy, dc.font.xfont);
 131         XFreePixmap(dpy, dc.drawable);
 132         XFreeGC(dpy, dc.gc);
 133         XDestroyWindow(dpy, win);
 134         XUngrabKeyboard(dpy, CurrentTime);
 135 }
 136
 137 void
 138 drawmenu(void) {
 139         Item *i;
 140
 141         dc.x = 0;
 142         dc.y = 0;
 143         dc.w = mw;
 144         dc.h = mh;
 145         drawtext(NULL, dc.norm);
 146         /* print prompt? */
 147         if(promptw) {
 148                 dc.w = promptw;
 149                 drawtext(prompt, dc.sel);
 150         }
 151         dc.x += promptw;
 152         dc.w = mw - promptw;
 153         /* print command */
 154         if(cmdw && item)
 155                 dc.w = cmdw;
 156         drawtext(text[0] ? text : NULL, dc.norm);
 157         dc.x += cmdw;
 158         if(curr) {
 159                 dc.w = SPACE;
 160                 drawtext((curr && curr->left) ? "<" : NULL, dc.norm);
 161                 dc.x += dc.w;
 162                 /* determine maximum items */
 163                 for(i = curr; i != next; i=i->right) {
 164                         dc.w = textw(i->text);
 165                         if(dc.w > mw / 3)
 166                                 dc.w = mw / 3;
 167                         drawtext(i->text, (sel == i) ? dc.sel : dc.norm);
 168                         dc.x += dc.w;
 169                 }
 170                 dc.x = mw - SPACE;
 171                 dc.w = SPACE;
 172                 drawtext(next ? ">" : NULL, dc.norm);
 173         }
 174         XCopyArea(dpy, dc.drawable, win, dc.gc, 0, 0, mw, mh, 0, 0);
 175         XFlush(dpy);
 176 }
 177
 178 void
 179 drawtext(const char *text, unsigned long col[ColLast]) {
 180         int x, y, w, h;
 181         static char buf[256];
 182         unsigned int len, olen;
 183         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 184
 185         XSetForeground(dpy, dc.gc, col[ColBG]);
 186         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 187         if(!text)
 188                 return;
 189         w = 0;
 190         olen = len = strlen(text);
 191         if(len >= sizeof buf)
 192                 len = sizeof buf - 1;
 193         memcpy(buf, text, len);
 194         buf[len] = 0;
 195         h = dc.font.ascent + dc.font.descent;
 196         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 197         x = dc.x + (h / 2);
 198         /* shorten text if necessary */
 199         while(len && (w = textnw(buf, len)) > dc.w - h)
 200                 buf[--len] = 0;
 201         if(len < olen) {
 202                 if(len > 1)
 203                         buf[len - 1] = '.';
 204                 if(len > 2)
 205                         buf[len - 2] = '.';
 206                 if(len > 3)
 207                         buf[len - 3] = '.';
 208         }
 209         if(w > dc.w)
 210                 return; /* too long */
 211         XSetForeground(dpy, dc.gc, col[ColFG]);
 212         if(dc.font.set)
 213                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 214         else
 215                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 216 }
 217
 218 void *
 219 emalloc(unsigned int size) {
 220         void *res = malloc(size);
 221
 222         if(!res)
 223                 eprint("fatal: could not malloc() %u bytes\n", size);
 224         return res;
 225 }
 226
 227 void
 228 eprint(const char *errstr, ...) {
 229         va_list ap;
 230
 231         va_start(ap, errstr);
 232         vfprintf(stderr, errstr, ap);
 233         va_end(ap);
 234         exit(EXIT_FAILURE);
 235 }
 236
 237 char *
 238 estrdup(const char *str) {
 239         void *res = strdup(str);
 240
 241         if(!res)
 242                 eprint("fatal: could not malloc() %u bytes\n", strlen(str));
 243         return res;
 244 }
 245
 246 unsigned long
 247 getcolor(const char *colstr) {
 248         Colormap cmap = DefaultColormap(dpy, screen);
 249         XColor color;
 250
 251         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 252                 eprint("error, cannot allocate color '%s'\n", colstr);
 253         return color.pixel;
 254 }
 255
 256 Bool
 257 grabkeyboard(void) {
 258         unsigned int len;
 259
 260         for(len = 1000; len; len--) {
 261                 if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
 262                         == GrabSuccess)
 263                         break;
 264                 usleep(1000);
 265         }
 266         return len > 0;
 267 }
 268
 269 void
 270 initfont(const char *fontstr) {
 271         char *def, **missing;
 272         int i, n;
 273
 274         if(!fontstr || fontstr[0] == '\0')
 275                 eprint("error, cannot load font: '%s'\n", fontstr);
 276         missing = NULL;
 277         if(dc.font.set)
 278                 XFreeFontSet(dpy, dc.font.set);
 279         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 280         if(missing)
 281                 XFreeStringList(missing);
 282         if(dc.font.set) {
 283                 XFontSetExtents *font_extents;
 284                 XFontStruct **xfonts;
 285                 char **font_names;
 286                 dc.font.ascent = dc.font.descent = 0;
 287                 font_extents = XExtentsOfFontSet(dc.font.set);
 288                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 289                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 290                         if(dc.font.ascent < (*xfonts)->ascent)
 291                                 dc.font.ascent = (*xfonts)->ascent;
 292                         if(dc.font.descent < (*xfonts)->descent)
 293                                 dc.font.descent = (*xfonts)->descent;
 294                         xfonts++;
 295                 }
 296         }
 297         else {
 298                 if(dc.font.xfont)
 299                         XFreeFont(dpy, dc.font.xfont);
 300                 dc.font.xfont = NULL;
 301                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))) {
 302                         if(!(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 303                                 eprint("error, cannot load font: '%s'\n", fontstr);
 304                 }
 305                 dc.font.ascent = dc.font.xfont->ascent;
 306                 dc.font.descent = dc.font.xfont->descent;
 307         }
 308         dc.font.height = dc.font.ascent + dc.font.descent;
 309 }
 310
 311 void
 312 kpress(XKeyEvent * e) {
 313         char buf[32];
 314         int i, num;
 315         unsigned int len;
 316         KeySym ksym;
 317
 318         len = strlen(text);
 319         buf[0] = 0;
 320         num = XLookupString(e, buf, sizeof buf, &ksym, 0);
 321         if(IsKeypadKey(ksym)) {
 322                 if(ksym == XK_KP_Enter) {
 323                         ksym = XK_Return;
 324                 } else if(ksym >= XK_KP_0 && ksym <= XK_KP_9) {
 325                         ksym = (ksym - XK_KP_0) + XK_0;
 326                 }
 327         }
 328         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 329                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 330                         || IsPrivateKeypadKey(ksym))
 331                 return;
 332         /* first check if a control mask is omitted */
 333         if(e->state & ControlMask) {
 334                 switch (ksym) {
 335                 default:        /* ignore other control sequences */
 336                         return;
 337                 case XK_bracketleft:
 338                         ksym = XK_Escape;
 339                         break;
 340                 case XK_h:
 341                 case XK_H:
 342                         ksym = XK_BackSpace;
 343                         break;
 344                 case XK_i:
 345                 case XK_I:
 346                         ksym = XK_Tab;
 347                         break;
 348                 case XK_j:
 349                 case XK_J:
 350                         ksym = XK_Return;
 351                         break;
 352                 case XK_u:
 353                 case XK_U:
 354                         text[0] = 0;
 355                         match(text);
 356                         drawmenu();
 357                         return;
 358                 case XK_w:
 359                 case XK_W:
 360                         if(len) {
 361                                 i = len - 1;
 362                                 while(i >= 0 && text[i] == ' ')
 363                                         text[i--] = 0;
 364                                 while(i >= 0 && text[i] != ' ')
 365                                         text[i--] = 0;
 366                                 match(text);
 367                                 drawmenu();
 368                         }
 369                         return;
 370                 }
 371         }
 372         if(CLEANMASK(e->state) & Mod1Mask) {
 373                 switch(ksym) {
 374                 default: return;
 375                 case XK_h:
 376                         ksym = XK_Left;
 377                         break;
 378                 case XK_l:
 379                         ksym = XK_Right;
 380                         break;
 381                 case XK_j:
 382                         ksym = XK_Next;
 383                         break;
 384                 case XK_k:
 385                         ksym = XK_Prior;
 386                         break;
 387                 case XK_g:
 388                         ksym = XK_Home;
 389                         break;
 390                 case XK_G:
 391                         ksym = XK_End;
 392                         break;
 393                 }
 394         }
 395         switch(ksym) {
 396         default:
 397                 if(num && !iscntrl((int) buf[0])) {
 398                         buf[num] = 0;
 399                         if(len > 0)
 400                                 strncat(text, buf, sizeof text);
 401                         else
 402                                 strncpy(text, buf, sizeof text);
 403                         match(text);
 404                 }
 405                 break;
 406         case XK_BackSpace:
 407                 if(len) {
 408                         text[--len] = 0;
 409                         match(text);
 410                 }
 411                 break;
 412         case XK_End:
 413                 if(!item)
 414                         return;
 415                 while(next) {
 416                         sel = curr = next;
 417                         calcoffsets();
 418                 }
 419                 while(sel && sel->right)
 420                         sel = sel->right;
 421                 break;
 422         case XK_Escape:
 423                 ret = 1;
 424                 running = False;
 425                 break;
 426         case XK_Home:
 427                 if(!item)
 428                         return;
 429                 sel = curr = item;
 430                 calcoffsets();
 431                 break;
 432         case XK_Left:
 433                 if(!(sel && sel->left))
 434                         return;
 435                 sel=sel->left;
 436                 if(sel->right == curr) {
 437                         curr = prev;
 438                         calcoffsets();
 439                 }
 440                 break;
 441         case XK_Next:
 442                 if(!next)
 443                         return;
 444                 sel = curr = next;
 445                 calcoffsets();
 446                 break;
 447         case XK_Prior:
 448                 if(!prev)
 449                         return;
 450                 sel = curr = prev;
 451                 calcoffsets();
 452                 break;
 453         case XK_Return:
 454                 if((e->state & ShiftMask) && text)
 455                         fprintf(stdout, "%s", text);
 456                 else if(sel)
 457                         fprintf(stdout, "%s", sel->text);
 458                 else if(text)
 459                         fprintf(stdout, "%s", text);
 460                 fflush(stdout);
 461                 running = False;
 462                 break;
 463         case XK_Right:
 464                 if(!(sel && sel->right))
 465                         return;
 466                 sel=sel->right;
 467                 if(sel == next) {
 468                         curr = next;
 469                         calcoffsets();
 470                 }
 471                 break;
 472         case XK_Tab:
 473                 if(!sel)
 474                         return;
 475                 strncpy(text, sel->text, sizeof text);
 476                 match(text);
 477                 break;
 478         }
 479         drawmenu();
 480 }
 481
 482 void
 483 match(char *pattern) {
 484         unsigned int plen;
 485         Item *i, *j;
 486
 487         if(!pattern)
 488                 return;
 489         plen = strlen(pattern);
 490         item = j = NULL;
 491         nitem = 0;
 492         for(i = allitems; i; i=i->next)
 493                 if(!plen || !strncmp(pattern, i->text, plen)) {
 494                         if(!j)
 495                                 item = i;
 496                         else
 497                                 j->right = i;
 498                         i->left = j;
 499                         i->right = NULL;
 500                         j = i;
 501                         nitem++;
 502                 }
 503         for(i = allitems; i; i=i->next)
 504                 if(plen && strncmp(pattern, i->text, plen)
 505                                 && strstr(i->text, pattern)) {
 506                         if(!j)
 507                                 item = i;
 508                         else
 509                                 j->right = i;
 510                         i->left = j;
 511                         i->right = NULL;
 512                         j = i;
 513                         nitem++;
 514                 }
 515         for(i = allitems; i; i=i->next)
 516                 if(plen && strncmp(pattern, i->text, plen)
 517                                 && !strstr(i->text, pattern)
 518                                 && strido(i->text,pattern)) {
 519                         if(!j)
 520                                 item = i;
 521                         else
 522                                 j->right = i;
 523                         i->left = j;
 524                         i->right = NULL;
 525                         j = i;
 526                         nitem++;
 527                 }
 528         curr = prev = next = sel = item;
 529         calcoffsets();
 530 }
 531
 532 void
 533 readstdin(void) {
 534         char *p, buf[1024];
 535         unsigned int len = 0, max = 0;
 536         Item *i, *new;
 537
 538         i = 0;
 539         while(fgets(buf, sizeof buf, stdin)) {
 540                 len = strlen(buf);
 541                 if (buf[len - 1] == '\n')
 542                         buf[len - 1] = 0;
 543                 p = estrdup(buf);
 544                 if(max < len) {
 545                         maxname = p;
 546                         max = len;
 547                 }
 548                 new = emalloc(sizeof(Item));
 549                 new->next = new->left = new->right = NULL;
 550                 new->text = p;
 551                 if(!i)
 552                         allitems = new;
 553                 else
 554                         i->next = new;
 555                 i = new;
 556         }
 557 }
 558
 559 void
 560 run(void) {
 561         XEvent ev;
 562
 563         /* main event loop */
 564         while(running && !XNextEvent(dpy, &ev))
 565                 switch (ev.type) {
 566                 default:        /* ignore all crap */
 567                         break;
 568                 case KeyPress:
 569                         kpress(&ev.xkey);
 570                         break;
 571                 case Expose:
 572                         if(ev.xexpose.count == 0)
 573                                 drawmenu();
 574                         break;
 575                 }
 576 }
 577
 578 void
 579 setup(Bool bottom) {
 580         unsigned int i, j;
 581         XModifierKeymap *modmap;
 582         XSetWindowAttributes wa;
 583
 584         /* init modifier map */
 585         modmap = XGetModifierMapping(dpy);
 586         for(i = 0; i < 8; i++)
 587                 for(j = 0; j < modmap->max_keypermod; j++) {
 588                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 589                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 590                                 numlockmask = (1 << i);
 591                 }
 592         XFreeModifiermap(modmap);
 593
 594         /* style */
 595         dc.norm[ColBG] = getcolor(normbg);
 596         dc.norm[ColFG] = getcolor(normfg);
 597         dc.sel[ColBG] = getcolor(selbg);
 598         dc.sel[ColFG] = getcolor(selfg);
 599         initfont(font);
 600
 601         /* menu window */
 602         wa.override_redirect = 1;
 603         wa.background_pixmap = ParentRelative;
 604         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 605         mw = DisplayWidth(dpy, screen);
 606         mh = dc.font.height + 2;
 607         win = XCreateWindow(dpy, root, 0,
 608                         bottom ? DisplayHeight(dpy, screen) - mh : 0, mw, mh, 0,
 609                         DefaultDepth(dpy, screen), CopyFromParent,
 610                         DefaultVisual(dpy, screen),
 611                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 612
 613         /* pixmap */
 614         dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
 615         dc.gc = XCreateGC(dpy, root, 0, 0);
 616         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 617         if(!dc.font.set)
 618                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 619         if(maxname)
 620                 cmdw = textw(maxname);
 621         if(cmdw > mw / 3)
 622                 cmdw = mw / 3;
 623         if(prompt)
 624                 promptw = textw(prompt);
 625         if(promptw > mw / 5)
 626                 promptw = mw / 5;
 627         text[0] = 0;
 628         match(text);
 629         XMapRaised(dpy, win);
 630 }
 631
 632 int
 633 strido(const char *text, const char *pattern) {
 634         for(; *text && *pattern; text++)
 635                 if (*text == *pattern)
 636                         pattern++;
 637         return !*pattern;
 638 }
 639
 640 unsigned int
 641 textnw(const char *text, unsigned int len) {
 642         XRectangle r;
 643
 644         if(dc.font.set) {
 645                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
 646                 return r.width;
 647         }
 648         return XTextWidth(dc.font.xfont, text, len);
 649 }
 650
 651 unsigned int
 652 textw(const char *text) {
 653         return textnw(text, strlen(text)) + dc.font.height;
 654 }
 655
 656 int
 657 main(int argc, char *argv[]) {
 658         Bool bottom = False;
 659         unsigned int i;
 660
 661         /* command line args */
 662         for(i = 1; i < argc; i++)
 663                 if(!strcmp(argv[i], "-b")) {
 664                         bottom = True;
 665                 }
 666                 else if(!strcmp(argv[i], "-fn")) {
 667                         if(++i < argc) font = argv[i];
 668                 }
 669                 else if(!strcmp(argv[i], "-nb")) {
 670                         if(++i < argc) normbg = argv[i];
 671                 }
 672                 else if(!strcmp(argv[i], "-nf")) {
 673                         if(++i < argc) normfg = argv[i];
 674                 }
 675                 else if(!strcmp(argv[i], "-p")) {
 676                         if(++i < argc) prompt = argv[i];
 677                 }
 678                 else if(!strcmp(argv[i], "-sb")) {
 679                         if(++i < argc) selbg = argv[i];
 680                 }
 681                 else if(!strcmp(argv[i], "-sf")) {
 682                         if(++i < argc) selfg = argv[i];
 683                 }
 684                 else if(!strcmp(argv[i], "-v"))
 685                         eprint("dmenu-"VERSION", © 2006-2007 Anselm R. Garbe, Sander van Dijk\n");
 686                 else
 687                         eprint("usage: dmenu [-b] [-fn <font>] [-nb <color>] [-nf <color>]\n"
 688                         "             [-p <prompt>] [-sb <color>] [-sf <color>] [-v]\n");
 689         setlocale(LC_CTYPE, "");
 690         dpy = XOpenDisplay(0);
 691         if(!dpy)
 692                 eprint("dmenu: cannot open display\n");
 693         screen = DefaultScreen(dpy);
 694         root = RootWindow(dpy, screen);
 695
 696         if(isatty(STDIN_FILENO)) {
 697                 readstdin();
 698                 running = grabkeyboard();
 699         }
 700         else { /* prevent keypress loss */
 701                 running = grabkeyboard();
 702                 readstdin();
 703         }
 704
 705         setup(bottom);
 706         drawmenu();
 707         XSync(dpy, False);
 708         run();
 709         cleanup();
 710         XCloseDisplay(dpy);
 711         return ret;
 712 }