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                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 303                         eprint("error, cannot load font: '%s'\n", fontstr);
 304                 dc.font.ascent = dc.font.xfont->ascent;
 305                 dc.font.descent = dc.font.xfont->descent;
 306         }
 307         dc.font.height = dc.font.ascent + dc.font.descent;
 308 }
 309
 310 void
 311 kpress(XKeyEvent * e) {
 312         char buf[32];
 313         int i, num;
 314         unsigned int len;
 315         KeySym ksym;
 316
 317         len = strlen(text);
 318         buf[0] = 0;
 319         num = XLookupString(e, buf, sizeof buf, &ksym, 0);
 320         if(IsKeypadKey(ksym)) {
 321                 if(ksym == XK_KP_Enter) {
 322                         ksym = XK_Return;
 323                 } else if(ksym >= XK_KP_0 && ksym <= XK_KP_9) {
 324                         ksym = (ksym - XK_KP_0) + XK_0;
 325                 }
 326         }
 327         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 328                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 329                         || IsPrivateKeypadKey(ksym))
 330                 return;
 331         /* first check if a control mask is omitted */
 332         if(e->state & ControlMask) {
 333                 switch (ksym) {
 334                 default:        /* ignore other control sequences */
 335                         return;
 336                 case XK_bracketleft:
 337                         ksym = XK_Escape;
 338                         break;
 339                 case XK_h:
 340                 case XK_H:
 341                         ksym = XK_BackSpace;
 342                         break;
 343                 case XK_i:
 344                 case XK_I:
 345                         ksym = XK_Tab;
 346                         break;
 347                 case XK_j:
 348                 case XK_J:
 349                         ksym = XK_Return;
 350                         break;
 351                 case XK_u:
 352                 case XK_U:
 353                         text[0] = 0;
 354                         match(text);
 355                         drawmenu();
 356                         return;
 357                 case XK_w:
 358                 case XK_W:
 359                         if(len) {
 360                                 i = len - 1;
 361                                 while(i >= 0 && text[i] == ' ')
 362                                         text[i--] = 0;
 363                                 while(i >= 0 && text[i] != ' ')
 364                                         text[i--] = 0;
 365                                 match(text);
 366                                 drawmenu();
 367                         }
 368                         return;
 369                 }
 370         }
 371         if(CLEANMASK(e->state) & Mod1Mask) {
 372                 switch(ksym) {
 373                 default: return;
 374                 case XK_h:
 375                         ksym = XK_Left;
 376                         break;
 377                 case XK_l:
 378                         ksym = XK_Right;
 379                         break;
 380                 case XK_j:
 381                         ksym = XK_Next;
 382                         break;
 383                 case XK_k:
 384                         ksym = XK_Prior;
 385                         break;
 386                 case XK_g:
 387                         ksym = XK_Home;
 388                         break;
 389                 case XK_G:
 390                         ksym = XK_End;
 391                         break;
 392                 }
 393         }
 394         switch(ksym) {
 395         default:
 396                 if(num && !iscntrl((int) buf[0])) {
 397                         buf[num] = 0;
 398                         if(len > 0)
 399                                 strncat(text, buf, sizeof text);
 400                         else
 401                                 strncpy(text, buf, sizeof text);
 402                         match(text);
 403                 }
 404                 break;
 405         case XK_BackSpace:
 406                 if(len) {
 407                         text[--len] = 0;
 408                         match(text);
 409                 }
 410                 break;
 411         case XK_End:
 412                 if(!item)
 413                         return;
 414                 while(next) {
 415                         sel = curr = next;
 416                         calcoffsets();
 417                 }
 418                 while(sel && sel->right)
 419                         sel = sel->right;
 420                 break;
 421         case XK_Escape:
 422                 ret = 1;
 423                 running = False;
 424                 break;
 425         case XK_Home:
 426                 if(!item)
 427                         return;
 428                 sel = curr = item;
 429                 calcoffsets();
 430                 break;
 431         case XK_Left:
 432                 if(!(sel && sel->left))
 433                         return;
 434                 sel=sel->left;
 435                 if(sel->right == curr) {
 436                         curr = prev;
 437                         calcoffsets();
 438                 }
 439                 break;
 440         case XK_Next:
 441                 if(!next)
 442                         return;
 443                 sel = curr = next;
 444                 calcoffsets();
 445                 break;
 446         case XK_Prior:
 447                 if(!prev)
 448                         return;
 449                 sel = curr = prev;
 450                 calcoffsets();
 451                 break;
 452         case XK_Return:
 453                 if((e->state & ShiftMask) && text)
 454                         fprintf(stdout, "%s", text);
 455                 else if(sel)
 456                         fprintf(stdout, "%s", sel->text);
 457                 else if(text)
 458                         fprintf(stdout, "%s", text);
 459                 fflush(stdout);
 460                 running = False;
 461                 break;
 462         case XK_Right:
 463                 if(!(sel && sel->right))
 464                         return;
 465                 sel=sel->right;
 466                 if(sel == next) {
 467                         curr = next;
 468                         calcoffsets();
 469                 }
 470                 break;
 471         case XK_Tab:
 472                 if(!sel)
 473                         return;
 474                 strncpy(text, sel->text, sizeof text);
 475                 match(text);
 476                 break;
 477         }
 478         drawmenu();
 479 }
 480
 481 void
 482 match(char *pattern) {
 483         unsigned int plen;
 484         Item *i, *j;
 485
 486         if(!pattern)
 487                 return;
 488         plen = strlen(pattern);
 489         item = j = NULL;
 490         nitem = 0;
 491         for(i = allitems; i; i=i->next)
 492                 if(!plen || !strncmp(pattern, i->text, plen)) {
 493                         if(!j)
 494                                 item = i;
 495                         else
 496                                 j->right = i;
 497                         i->left = j;
 498                         i->right = NULL;
 499                         j = i;
 500                         nitem++;
 501                 }
 502         for(i = allitems; i; i=i->next)
 503                 if(plen && strncmp(pattern, i->text, plen)
 504                                 && strstr(i->text, pattern)) {
 505                         if(!j)
 506                                 item = i;
 507                         else
 508                                 j->right = i;
 509                         i->left = j;
 510                         i->right = NULL;
 511                         j = i;
 512                         nitem++;
 513                 }
 514         for(i = allitems; i; i=i->next)
 515                 if(plen && strncmp(pattern, i->text, plen)
 516                                 && !strstr(i->text, pattern)
 517                                 && strido(i->text,pattern)) {
 518                         if(!j)
 519                                 item = i;
 520                         else
 521                                 j->right = i;
 522                         i->left = j;
 523                         i->right = NULL;
 524                         j = i;
 525                         nitem++;
 526                 }
 527         curr = prev = next = sel = item;
 528         calcoffsets();
 529 }
 530
 531 void
 532 readstdin(void) {
 533         char *p, buf[1024];
 534         unsigned int len = 0, max = 0;
 535         Item *i, *new;
 536
 537         i = 0;
 538         while(fgets(buf, sizeof buf, stdin)) {
 539                 len = strlen(buf);
 540                 if (buf[len - 1] == '\n')
 541                         buf[len - 1] = 0;
 542                 p = estrdup(buf);
 543                 if(max < len) {
 544                         maxname = p;
 545                         max = len;
 546                 }
 547                 new = emalloc(sizeof(Item));
 548                 new->next = new->left = new->right = NULL;
 549                 new->text = p;
 550                 if(!i)
 551                         allitems = new;
 552                 else
 553                         i->next = new;
 554                 i = new;
 555         }
 556 }
 557
 558 void
 559 run(void) {
 560         XEvent ev;
 561
 562         /* main event loop */
 563         while(running && !XNextEvent(dpy, &ev))
 564                 switch (ev.type) {
 565                 default:        /* ignore all crap */
 566                         break;
 567                 case KeyPress:
 568                         kpress(&ev.xkey);
 569                         break;
 570                 case Expose:
 571                         if(ev.xexpose.count == 0)
 572                                 drawmenu();
 573                         break;
 574                 }
 575 }
 576
 577 void
 578 setup(Bool bottom) {
 579         unsigned int i, j;
 580         XModifierKeymap *modmap;
 581         XSetWindowAttributes wa;
 582
 583         /* init modifier map */
 584         modmap = XGetModifierMapping(dpy);
 585         for(i = 0; i < 8; i++)
 586                 for(j = 0; j < modmap->max_keypermod; j++) {
 587                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 588                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 589                                 numlockmask = (1 << i);
 590                 }
 591         XFreeModifiermap(modmap);
 592
 593         /* style */
 594         dc.norm[ColBG] = getcolor(normbg);
 595         dc.norm[ColFG] = getcolor(normfg);
 596         dc.sel[ColBG] = getcolor(selbg);
 597         dc.sel[ColFG] = getcolor(selfg);
 598         initfont(font);
 599
 600         /* menu window */
 601         wa.override_redirect = 1;
 602         wa.background_pixmap = ParentRelative;
 603         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 604         mw = DisplayWidth(dpy, screen);
 605         mh = dc.font.height + 2;
 606         win = XCreateWindow(dpy, root, 0,
 607                         bottom ? DisplayHeight(dpy, screen) - mh : 0, mw, mh, 0,
 608                         DefaultDepth(dpy, screen), CopyFromParent,
 609                         DefaultVisual(dpy, screen),
 610                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 611
 612         /* pixmap */
 613         dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
 614         dc.gc = XCreateGC(dpy, root, 0, 0);
 615         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 616         if(!dc.font.set)
 617                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 618         if(maxname)
 619                 cmdw = textw(maxname);
 620         if(cmdw > mw / 3)
 621                 cmdw = mw / 3;
 622         if(prompt)
 623                 promptw = textw(prompt);
 624         if(promptw > mw / 5)
 625                 promptw = mw / 5;
 626         text[0] = 0;
 627         match(text);
 628         XMapRaised(dpy, win);
 629 }
 630
 631 int
 632 strido(const char *text, const char *pattern) {
 633         for(; *text && *pattern; text++)
 634                 if (*text == *pattern)
 635                         pattern++;
 636         return !*pattern;
 637 }
 638
 639 unsigned int
 640 textnw(const char *text, unsigned int len) {
 641         XRectangle r;
 642
 643         if(dc.font.set) {
 644                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
 645                 return r.width;
 646         }
 647         return XTextWidth(dc.font.xfont, text, len);
 648 }
 649
 650 unsigned int
 651 textw(const char *text) {
 652         return textnw(text, strlen(text)) + dc.font.height;
 653 }
 654
 655 int
 656 main(int argc, char *argv[]) {
 657         Bool bottom = False;
 658         unsigned int i;
 659
 660         /* command line args */
 661         for(i = 1; i < argc; i++)
 662                 if(!strcmp(argv[i], "-b")) {
 663                         bottom = True;
 664                 }
 665                 else if(!strcmp(argv[i], "-fn")) {
 666                         if(++i < argc) font = argv[i];
 667                 }
 668                 else if(!strcmp(argv[i], "-nb")) {
 669                         if(++i < argc) normbg = argv[i];
 670                 }
 671                 else if(!strcmp(argv[i], "-nf")) {
 672                         if(++i < argc) normfg = argv[i];
 673                 }
 674                 else if(!strcmp(argv[i], "-p")) {
 675                         if(++i < argc) prompt = argv[i];
 676                 }
 677                 else if(!strcmp(argv[i], "-sb")) {
 678                         if(++i < argc) selbg = argv[i];
 679                 }
 680                 else if(!strcmp(argv[i], "-sf")) {
 681                         if(++i < argc) selfg = argv[i];
 682                 }
 683                 else if(!strcmp(argv[i], "-v"))
 684                         eprint("dmenu-"VERSION", © 2006-2007 Anselm R. Garbe, Sander van Dijk\n");
 685                 else
 686                         eprint("usage: dmenu [-b] [-fn <font>] [-nb <color>] [-nf <color>]\n"
 687                         "             [-p <prompt>] [-sb <color>] [-sf <color>] [-v]\n");
 688         setlocale(LC_CTYPE, "");
 689         dpy = XOpenDisplay(0);
 690         if(!dpy)
 691                 eprint("dmenu: cannot open display\n");
 692         screen = DefaultScreen(dpy);
 693         root = RootWindow(dpy, screen);
 694
 695         if(isatty(STDIN_FILENO)) {
 696                 readstdin();
 697                 running = grabkeyboard();
 698         }
 699         else { /* prevent keypress loss */
 700                 running = grabkeyboard();
 701                 readstdin();
 702         }
 703
 704         setup(bottom);
 705         drawmenu();
 706         XSync(dpy, False);
 707         run();
 708         cleanup();
 709         XCloseDisplay(dpy);
 710         return ret;
 711 }