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