main.c

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