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