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 Item *appenditem(Item *i, Item *last);
  44 void calcoffsets(void);
  45 void cleanup(void);
  46 void drawmenu(void);
  47 void drawtext(const char *text, unsigned long col[ColLast]);
  48 void *emalloc(unsigned int size);
  49 void eprint(const char *errstr, ...);
  50 char *estrdup(const char *str);
  51 unsigned long getcolor(const char *colstr);
  52 Bool grabkeyboard(void);
  53 void initfont(const char *fontstr);
  54 void kpress(XKeyEvent * e);
  55 void match(char *pattern);
  56 void readstdin(void);
  57 void run(void);
  58 void setup(int x, int y, int w);
  59 char *cistrstr(const char *s, const char *sub);
  60 unsigned int textnw(const char *text, unsigned int len);
  61 unsigned int textw(const char *text);
  62
  63 #include "config.h"
  64
  65 /* variables */
  66 char *font = FONT;
  67 char *maxname = NULL;
  68 char *normbg = NORMBGCOLOR;
  69 char *normfg = NORMFGCOLOR;
  70 char *prompt = NULL;
  71 char *selbg = SELBGCOLOR;
  72 char *selfg = SELFGCOLOR;
  73 char text[4096];
  74 int screen;
  75 int ret = 0;
  76 unsigned int cmdw = 0;
  77 unsigned int mw, mh;
  78 unsigned int promptw = 0;
  79 unsigned int nitem = 0;
  80 unsigned int numlockmask = 0;
  81 Bool running = True;
  82 Display *dpy;
  83 DC dc = {0};
  84 Item *allitems = NULL;  /* first of all items */
  85 Item *item = NULL;      /* first of pattern matching items */
  86 Item *sel = NULL;
  87 Item *next = NULL;
  88 Item *prev = NULL;
  89 Item *curr = NULL;
  90 Window root, win;
  91 int (*fstrncmp)(const char *, const char *, size_t n) = strncmp;
  92 char *(*fstrstr)(const char *, const char *) = strstr;
  93
  94 Item *
  95 appenditem(Item *i, Item *last) {
  96         if(!last)
  97                 item = i;
  98         else
  99                 last->right = i;
 100         i->left = last;
 101         i->right = NULL;
 102         last = i;
 103         nitem++;
 104         return last;
 105 }
 106
 107 void
 108 calcoffsets(void) {
 109         unsigned int tw, w;
 110
 111         if(!curr)
 112                 return;
 113         w = promptw + cmdw + 2 * SPACE;
 114         for(next = curr; next; next=next->right) {
 115                 tw = textw(next->text);
 116                 if(tw > mw / 3)
 117                         tw = mw / 3;
 118                 w += tw;
 119                 if(w > mw)
 120                         break;
 121         }
 122         w = promptw + cmdw + 2 * SPACE;
 123         for(prev = curr; prev && prev->left; prev=prev->left) {
 124                 tw = textw(prev->left->text);
 125                 if(tw > mw / 3)
 126                         tw = mw / 3;
 127                 w += tw;
 128                 if(w > mw)
 129                         break;
 130         }
 131 }
 132
 133 void
 134 cleanup(void) {
 135         Item *itm;
 136
 137         while(allitems) {
 138                 itm = allitems->next;
 139                 free(allitems->text);
 140                 free(allitems);
 141                 allitems = itm;
 142         }
 143         if(dc.font.set)
 144                 XFreeFontSet(dpy, dc.font.set);
 145         else
 146                 XFreeFont(dpy, dc.font.xfont);
 147         XFreePixmap(dpy, dc.drawable);
 148         XFreeGC(dpy, dc.gc);
 149         XDestroyWindow(dpy, win);
 150         XUngrabKeyboard(dpy, CurrentTime);
 151 }
 152
 153 void
 154 drawmenu(void) {
 155         Item *i;
 156
 157         dc.x = 0;
 158         dc.y = 0;
 159         dc.w = mw;
 160         dc.h = mh;
 161         drawtext(NULL, dc.norm);
 162         /* print prompt? */
 163         if(promptw) {
 164                 dc.w = promptw;
 165                 drawtext(prompt, dc.sel);
 166         }
 167         dc.x += promptw;
 168         dc.w = mw - promptw;
 169         /* print command */
 170         if(cmdw && item)
 171                 dc.w = cmdw;
 172         drawtext(text[0] ? text : NULL, dc.norm);
 173         dc.x += cmdw;
 174         if(curr) {
 175                 dc.w = SPACE;
 176                 drawtext((curr && curr->left) ? "<" : NULL, dc.norm);
 177                 dc.x += dc.w;
 178                 /* determine maximum items */
 179                 for(i = curr; i != next; i=i->right) {
 180                         dc.w = textw(i->text);
 181                         if(dc.w > mw / 3)
 182                                 dc.w = mw / 3;
 183                         drawtext(i->text, (sel == i) ? dc.sel : dc.norm);
 184                         dc.x += dc.w;
 185                 }
 186                 dc.x = mw - SPACE;
 187                 dc.w = SPACE;
 188                 drawtext(next ? ">" : NULL, dc.norm);
 189         }
 190         XCopyArea(dpy, dc.drawable, win, dc.gc, 0, 0, mw, mh, 0, 0);
 191         XFlush(dpy);
 192 }
 193
 194 void
 195 drawtext(const char *text, unsigned long col[ColLast]) {
 196         int x, y, w, h;
 197         static char buf[256];
 198         unsigned int len, olen;
 199         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 200
 201         XSetForeground(dpy, dc.gc, col[ColBG]);
 202         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 203         if(!text)
 204                 return;
 205         w = 0;
 206         olen = len = strlen(text);
 207         if(len >= sizeof buf)
 208                 len = sizeof buf - 1;
 209         memcpy(buf, text, len);
 210         buf[len] = 0;
 211         h = dc.font.ascent + dc.font.descent;
 212         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 213         x = dc.x + (h / 2);
 214         /* shorten text if necessary */
 215         while(len && (w = textnw(buf, len)) > dc.w - h)
 216                 buf[--len] = 0;
 217         if(len < olen) {
 218                 if(len > 1)
 219                         buf[len - 1] = '.';
 220                 if(len > 2)
 221                         buf[len - 2] = '.';
 222                 if(len > 3)
 223                         buf[len - 3] = '.';
 224         }
 225         if(w > dc.w)
 226                 return; /* too long */
 227         XSetForeground(dpy, dc.gc, col[ColFG]);
 228         if(dc.font.set)
 229                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 230         else
 231                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 232 }
 233
 234 void *
 235 emalloc(unsigned int size) {
 236         void *res = malloc(size);
 237
 238         if(!res)
 239                 eprint("fatal: could not malloc() %u bytes\n", size);
 240         return res;
 241 }
 242
 243 void
 244 eprint(const char *errstr, ...) {
 245         va_list ap;
 246
 247         va_start(ap, errstr);
 248         vfprintf(stderr, errstr, ap);
 249         va_end(ap);
 250         exit(EXIT_FAILURE);
 251 }
 252
 253 char *
 254 estrdup(const char *str) {
 255         void *res = strdup(str);
 256
 257         if(!res)
 258                 eprint("fatal: could not malloc() %u bytes\n", strlen(str));
 259         return res;
 260 }
 261
 262 unsigned long
 263 getcolor(const char *colstr) {
 264         Colormap cmap = DefaultColormap(dpy, screen);
 265         XColor color;
 266
 267         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 268                 eprint("error, cannot allocate color '%s'\n", colstr);
 269         return color.pixel;
 270 }
 271
 272 Bool
 273 grabkeyboard(void) {
 274         unsigned int len;
 275
 276         for(len = 1000; len; len--) {
 277                 if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
 278                         == GrabSuccess)
 279                         break;
 280                 usleep(1000);
 281         }
 282         return len > 0;
 283 }
 284
 285 void
 286 initfont(const char *fontstr) {
 287         char *def, **missing;
 288         int i, n;
 289
 290         if(!fontstr || fontstr[0] == '\0')
 291                 eprint("error, cannot load font: '%s'\n", fontstr);
 292         missing = NULL;
 293         if(dc.font.set)
 294                 XFreeFontSet(dpy, dc.font.set);
 295         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 296         if(missing)
 297                 XFreeStringList(missing);
 298         if(dc.font.set) {
 299                 XFontSetExtents *font_extents;
 300                 XFontStruct **xfonts;
 301                 char **font_names;
 302                 dc.font.ascent = dc.font.descent = 0;
 303                 font_extents = XExtentsOfFontSet(dc.font.set);
 304                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 305                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 306                         if(dc.font.ascent < (*xfonts)->ascent)
 307                                 dc.font.ascent = (*xfonts)->ascent;
 308                         if(dc.font.descent < (*xfonts)->descent)
 309                                 dc.font.descent = (*xfonts)->descent;
 310                         xfonts++;
 311                 }
 312         }
 313         else {
 314                 if(dc.font.xfont)
 315                         XFreeFont(dpy, dc.font.xfont);
 316                 dc.font.xfont = NULL;
 317                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 318                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 319                         eprint("error, cannot load font: '%s'\n", fontstr);
 320                 dc.font.ascent = dc.font.xfont->ascent;
 321                 dc.font.descent = dc.font.xfont->descent;
 322         }
 323         dc.font.height = dc.font.ascent + dc.font.descent;
 324 }
 325
 326 void
 327 kpress(XKeyEvent * e) {
 328         char buf[32];
 329         int i, num;
 330         unsigned int len;
 331         KeySym ksym;
 332
 333         len = strlen(text);
 334         buf[0] = 0;
 335         num = XLookupString(e, buf, sizeof buf, &ksym, 0);
 336         if(IsKeypadKey(ksym)) {
 337                 if(ksym == XK_KP_Enter) {
 338                         ksym = XK_Return;
 339                 } else if(ksym >= XK_KP_0 && ksym <= XK_KP_9) {
 340                         ksym = (ksym - XK_KP_0) + XK_0;
 341                 }
 342         }
 343         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 344                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 345                         || IsPrivateKeypadKey(ksym))
 346                 return;
 347         /* first check if a control mask is omitted */
 348         if(e->state & ControlMask) {
 349                 switch (ksym) {
 350                 default:        /* ignore other control sequences */
 351                         return;
 352                 case XK_bracketleft:
 353                         ksym = XK_Escape;
 354                         break;
 355                 case XK_h:
 356                 case XK_H:
 357                         ksym = XK_BackSpace;
 358                         break;
 359                 case XK_i:
 360                 case XK_I:
 361                         ksym = XK_Tab;
 362                         break;
 363                 case XK_j:
 364                 case XK_J:
 365                         ksym = XK_Return;
 366                         break;
 367                 case XK_u:
 368                 case XK_U:
 369                         text[0] = 0;
 370                         match(text);
 371                         drawmenu();
 372                         return;
 373                 case XK_w:
 374                 case XK_W:
 375                         if(len) {
 376                                 i = len - 1;
 377                                 while(i >= 0 && text[i] == ' ')
 378                                         text[i--] = 0;
 379                                 while(i >= 0 && text[i] != ' ')
 380                                         text[i--] = 0;
 381                                 match(text);
 382                                 drawmenu();
 383                         }
 384                         return;
 385                 }
 386         }
 387         if(CLEANMASK(e->state) & Mod1Mask) {
 388                 switch(ksym) {
 389                 default: return;
 390                 case XK_h:
 391                         ksym = XK_Left;
 392                         break;
 393                 case XK_l:
 394                         ksym = XK_Right;
 395                         break;
 396                 case XK_j:
 397                         ksym = XK_Next;
 398                         break;
 399                 case XK_k:
 400                         ksym = XK_Prior;
 401                         break;
 402                 case XK_g:
 403                         ksym = XK_Home;
 404                         break;
 405                 case XK_G:
 406                         ksym = XK_End;
 407                         break;
 408                 }
 409         }
 410         switch(ksym) {
 411         default:
 412                 if(num && !iscntrl((int) buf[0])) {
 413                         buf[num] = 0;
 414                         if(len > 0)
 415                                 strncat(text, buf, sizeof text);
 416                         else
 417                                 strncpy(text, buf, sizeof text);
 418                         match(text);
 419                 }
 420                 break;
 421         case XK_BackSpace:
 422                 if(len) {
 423                         text[--len] = 0;
 424                         match(text);
 425                 }
 426                 break;
 427         case XK_End:
 428                 if(!item)
 429                         return;
 430                 while(next) {
 431                         sel = curr = next;
 432                         calcoffsets();
 433                 }
 434                 while(sel && sel->right)
 435                         sel = sel->right;
 436                 break;
 437         case XK_Escape:
 438                 ret = 1;
 439                 running = False;
 440                 break;
 441         case XK_Home:
 442                 if(!item)
 443                         return;
 444                 sel = curr = item;
 445                 calcoffsets();
 446                 break;
 447         case XK_Left:
 448                 if(!(sel && sel->left))
 449                         return;
 450                 sel=sel->left;
 451                 if(sel->right == curr) {
 452                         curr = prev;
 453                         calcoffsets();
 454                 }
 455                 break;
 456         case XK_Next:
 457                 if(!next)
 458                         return;
 459                 sel = curr = next;
 460                 calcoffsets();
 461                 break;
 462         case XK_Prior:
 463                 if(!prev)
 464                         return;
 465                 sel = curr = prev;
 466                 calcoffsets();
 467                 break;
 468         case XK_Return:
 469                 if((e->state & ShiftMask) && text)
 470                         fprintf(stdout, "%s", text);
 471                 else if(sel)
 472                         fprintf(stdout, "%s", sel->text);
 473                 else if(text)
 474                         fprintf(stdout, "%s", text);
 475                 fflush(stdout);
 476                 running = False;
 477                 break;
 478         case XK_Right:
 479                 if(!(sel && sel->right))
 480                         return;
 481                 sel=sel->right;
 482                 if(sel == next) {
 483                         curr = next;
 484                         calcoffsets();
 485                 }
 486                 break;
 487         case XK_Tab:
 488                 if(!sel)
 489                         return;
 490                 strncpy(text, sel->text, sizeof text);
 491                 match(text);
 492                 break;
 493         }
 494         drawmenu();
 495 }
 496
 497 void
 498 match(char *pattern) {
 499         unsigned int plen;
 500         Item *i, *j;
 501
 502         if(!pattern)
 503                 return;
 504         plen = strlen(pattern);
 505         item = j = NULL;
 506         nitem = 0;
 507         for(i = allitems; i; i = i->next)
 508                 if(!fstrncmp(pattern, i->text, plen)
 509                                 || fstrstr(i->text, pattern))
 510                         j = appenditem(i, j);
 511         curr = prev = next = sel = item;
 512         calcoffsets();
 513 }
 514
 515 void
 516 readstdin(void) {
 517         char *p, buf[1024];
 518         unsigned int len = 0, max = 0;
 519         Item *i, *new;
 520
 521         i = 0;
 522         while(fgets(buf, sizeof buf, stdin)) {
 523                 len = strlen(buf);
 524                 if (buf[len - 1] == '\n')
 525                         buf[len - 1] = 0;
 526                 p = estrdup(buf);
 527                 if(max < len) {
 528                         maxname = p;
 529                         max = len;
 530                 }
 531                 new = emalloc(sizeof(Item));
 532                 new->next = new->left = new->right = NULL;
 533                 new->text = p;
 534                 if(!i)
 535                         allitems = new;
 536                 else
 537                         i->next = new;
 538                 i = new;
 539         }
 540 }
 541
 542 void
 543 run(void) {
 544         XEvent ev;
 545
 546         /* main event loop */
 547         while(running && !XNextEvent(dpy, &ev))
 548                 switch (ev.type) {
 549                 default:        /* ignore all crap */
 550                         break;
 551                 case KeyPress:
 552                         kpress(&ev.xkey);
 553                         break;
 554                 case Expose:
 555                         if(ev.xexpose.count == 0)
 556                                 drawmenu();
 557                         break;
 558                 }
 559 }
 560
 561 void
 562 setup(int x, int y, int w) {
 563         unsigned int i, j;
 564         XModifierKeymap *modmap;
 565         XSetWindowAttributes wa;
 566
 567         /* init modifier map */
 568         modmap = XGetModifierMapping(dpy);
 569         for(i = 0; i < 8; i++)
 570                 for(j = 0; j < modmap->max_keypermod; j++) {
 571                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 572                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 573                                 numlockmask = (1 << i);
 574                 }
 575         XFreeModifiermap(modmap);
 576
 577         /* style */
 578         dc.norm[ColBG] = getcolor(normbg);
 579         dc.norm[ColFG] = getcolor(normfg);
 580         dc.sel[ColBG] = getcolor(selbg);
 581         dc.sel[ColFG] = getcolor(selfg);
 582         initfont(font);
 583
 584         /* menu window */
 585         wa.override_redirect = 1;
 586         wa.background_pixmap = ParentRelative;
 587         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 588         mw = w ? w : DisplayWidth(dpy, screen);
 589         mh = dc.font.height + 2;
 590         win = XCreateWindow(dpy, root, x, y, mw, mh, 0,
 591                         DefaultDepth(dpy, screen), CopyFromParent,
 592                         DefaultVisual(dpy, screen),
 593                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 594
 595         /* pixmap */
 596         dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
 597         dc.gc = XCreateGC(dpy, root, 0, 0);
 598         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 599         if(!dc.font.set)
 600                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 601         if(maxname)
 602                 cmdw = textw(maxname);
 603         if(cmdw > mw / 3)
 604                 cmdw = mw / 3;
 605         if(prompt)
 606                 promptw = textw(prompt);
 607         if(promptw > mw / 5)
 608                 promptw = mw / 5;
 609         text[0] = 0;
 610         match(text);
 611         XMapRaised(dpy, win);
 612 }
 613
 614 char *
 615 cistrstr(const char *s, const char *sub) {
 616         int c, csub;
 617         unsigned int len;
 618
 619         if(!sub)
 620                 return (char *)s;
 621         if((c = *sub++) != 0) {
 622                 c = tolower(c);
 623                 len = strlen(sub);
 624                 do {
 625                         do {
 626                                 if((csub = *s++) == 0)
 627                                         return (NULL);
 628                         }
 629                         while(tolower(csub) != c);
 630                 }
 631                 while(strncasecmp(s, sub, len) != 0);
 632                 s--;
 633         }
 634         return (char *)s;
 635 }
 636
 637 unsigned int
 638 textnw(const char *text, unsigned int len) {
 639         XRectangle r;
 640
 641         if(dc.font.set) {
 642                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
 643                 return r.width;
 644         }
 645         return XTextWidth(dc.font.xfont, text, len);
 646 }
 647
 648 unsigned int
 649 textw(const char *text) {
 650         return textnw(text, strlen(text)) + dc.font.height;
 651 }
 652
 653 int
 654 main(int argc, char *argv[]) {
 655         int x = 0, y = 0, w = 0;
 656         unsigned int i;
 657
 658         /* command line args */
 659         for(i = 1; i < argc; i++)
 660                 if(!strcmp(argv[i], "-i")) {
 661                         fstrncmp = strncasecmp;
 662                         fstrstr = cistrstr;
 663                 }
 664                 else if(!strcmp(argv[i], "-fn")) {
 665                         if(++i < argc) font = argv[i];
 666                 }
 667                 else if(!strcmp(argv[i], "-nb")) {
 668                         if(++i < argc) normbg = argv[i];
 669                 }
 670                 else if(!strcmp(argv[i], "-nf")) {
 671                         if(++i < argc) normfg = argv[i];
 672                 }
 673                 else if(!strcmp(argv[i], "-p")) {
 674                         if(++i < argc) prompt = argv[i];
 675                 }
 676                 else if(!strcmp(argv[i], "-sb")) {
 677                         if(++i < argc) selbg = argv[i];
 678                 }
 679                 else if(!strcmp(argv[i], "-sf")) {
 680                         if(++i < argc) selfg = argv[i];
 681                 }
 682                 else if(!strcmp(argv[i], "-x")) {
 683                         if(++i < argc) x = atoi(argv[i]);
 684                 }
 685                 else if(!strcmp(argv[i], "-y")) {
 686                         if(++i < argc) y = atoi(argv[i]);
 687                 }
 688                 else if(!strcmp(argv[i], "-w")) {
 689                         if(++i < argc) w = atoi(argv[i]);
 690                 }
 691                 else if(!strcmp(argv[i], "-v"))
 692                         eprint("dmenu-"VERSION", © 2006-2008 dmenu engineers, see LICENSE for details\n");
 693                 else
 694                         eprint("usage: dmenu [-i] [-fn <font>] [-nb <color>] [-nf <color>]\n"
 695                                "             [-p <prompt>] [-sb <color>] [-sf <color>]\n"
 696                                "             [-x <x>] [-y <y>] [-w <w>] [-v]\n");
 697         setlocale(LC_CTYPE, "");
 698         dpy = XOpenDisplay(0);
 699         if(!dpy)
 700                 eprint("dmenu: cannot open display\n");
 701         screen = DefaultScreen(dpy);
 702         root = RootWindow(dpy, screen);
 703
 704         if(isatty(STDIN_FILENO)) {
 705                 readstdin();
 706                 running = grabkeyboard();
 707         }
 708         else { /* prevent keypress loss */
 709                 running = grabkeyboard();
 710                 readstdin();
 711         }
 712
 713         setup(x, y, w);
 714         drawmenu();
 715         XSync(dpy, False);
 716         run();
 717         cleanup();
 718         XCloseDisplay(dpy);
 719         return ret;
 720 }