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(IsKeypadKey(ksym)) {
 220                 if(ksym == XK_KP_Enter) {
 221                         ksym = XK_Return;
 222                 } else if(ksym >= XK_KP_0 && ksym <= XK_KP_9) {
 223                         ksym = (ksym - XK_KP_0) + XK_0;
 224                 }
 225         }
 226         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 227                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 228                         || IsPrivateKeypadKey(ksym))
 229                 return;
 230         /* first check if a control mask is omitted */
 231         if(e->state & ControlMask) {
 232                 switch (ksym) {
 233                 default:        /* ignore other control sequences */
 234                         return;
 235                 case XK_bracketleft:
 236                         ksym = XK_Escape;
 237                         break;
 238                 case XK_h:
 239                 case XK_H:
 240                         ksym = XK_BackSpace;
 241                         break;
 242                 case XK_i:
 243                 case XK_I:
 244                         ksym = XK_Tab;
 245                         break;
 246                 case XK_j:
 247                 case XK_J:
 248                         ksym = XK_Return;
 249                         break;
 250                 case XK_u:
 251                 case XK_U:
 252                         text[0] = 0;
 253                         match(text);
 254                         drawmenu();
 255                         return;
 256                 case XK_w:
 257                 case XK_W:
 258                         if(len) {
 259                                 i = len - 1;
 260                                 while(i >= 0 && text[i] == ' ')
 261                                         text[i--] = 0;
 262                                 while(i >= 0 && text[i] != ' ')
 263                                         text[i--] = 0;
 264                                 match(text);
 265                                 drawmenu();
 266                         }
 267                         return;
 268                 }
 269         }
 270         if(CLEANMASK(e->state) & Mod1Mask) {
 271                 switch(ksym) {
 272                 default: return;
 273                 case XK_h:
 274                         ksym = XK_Left;
 275                         break;
 276                 case XK_l:
 277                         ksym = XK_Right;
 278                         break;
 279                 case XK_j:
 280                         ksym = XK_Next;
 281                         break;
 282                 case XK_k:
 283                         ksym = XK_Prior;
 284                         break;
 285                 case XK_g:
 286                         ksym = XK_Home;
 287                         break;
 288                 case XK_G:
 289                         ksym = XK_End;
 290                         break;
 291                 }
 292         }
 293         switch(ksym) {
 294         default:
 295                 if(num && !iscntrl((int) buf[0])) {
 296                         buf[num] = 0;
 297                         if(len > 0)
 298                                 strncat(text, buf, sizeof text);
 299                         else
 300                                 strncpy(text, buf, sizeof text);
 301                         match(text);
 302                 }
 303                 break;
 304         case XK_BackSpace:
 305                 if(len) {
 306                         text[--len] = 0;
 307                         match(text);
 308                 }
 309                 break;
 310         case XK_End:
 311                 if(!item)
 312                         return;
 313                 while(next) {
 314                         sel = curr = next;
 315                         calcoffsets();
 316                 }
 317                 while(sel && sel->right)
 318                         sel = sel->right;
 319                 break;
 320         case XK_Escape:
 321                 ret = 1;
 322                 running = False;
 323                 break;
 324         case XK_Home:
 325                 if(!item)
 326                         return;
 327                 sel = curr = item;
 328                 calcoffsets();
 329                 break;
 330         case XK_Left:
 331                 if(!(sel && sel->left))
 332                         return;
 333                 sel=sel->left;
 334                 if(sel->right == curr) {
 335                         curr = prev;
 336                         calcoffsets();
 337                 }
 338                 break;
 339         case XK_Next:
 340                 if(!next)
 341                         return;
 342                 sel = curr = next;
 343                 calcoffsets();
 344                 break;
 345         case XK_Prior:
 346                 if(!prev)
 347                         return;
 348                 sel = curr = prev;
 349                 calcoffsets();
 350                 break;
 351         case XK_Return:
 352                 if((e->state & ShiftMask) && text)
 353                         fprintf(stdout, "%s", text);
 354                 else if(sel)
 355                         fprintf(stdout, "%s", sel->text);
 356                 else if(text)
 357                         fprintf(stdout, "%s", text);
 358                 fflush(stdout);
 359                 running = False;
 360                 break;
 361         case XK_Right:
 362                 if(!(sel && sel->right))
 363                         return;
 364                 sel=sel->right;
 365                 if(sel == next) {
 366                         curr = next;
 367                         calcoffsets();
 368                 }
 369                 break;
 370         case XK_Tab:
 371                 if(!sel)
 372                         return;
 373                 strncpy(text, sel->text, sizeof text);
 374                 match(text);
 375                 break;
 376         }
 377         drawmenu();
 378 }
 379
 380 static char *
 381 readstdin(void) {
 382         static char *maxname = NULL;
 383         char *p, buf[1024];
 384         unsigned int len = 0, max = 0;
 385         Item *i, *new;
 386
 387         i = 0;
 388         while(fgets(buf, sizeof buf, stdin)) {
 389                 len = strlen(buf);
 390                 if (buf[len - 1] == '\n')
 391                         buf[len - 1] = 0;
 392                 p = estrdup(buf);
 393                 if(max < len) {
 394                         maxname = p;
 395                         max = len;
 396                 }
 397                 new = emalloc(sizeof(Item));
 398                 new->next = new->left = new->right = NULL;
 399                 new->text = p;
 400                 if(!i)
 401                         allitems = new;
 402                 else
 403                         i->next = new;
 404                 i = new;
 405         }
 406
 407         return maxname;
 408 }
 409
 410 static void
 411 usage(void) {
 412         eprint("usage: dmenu [-b] [-fn <font>] [-nb <color>] [-nf <color>]\n"
 413                 "             [-p <prompt>] [-sb <color>] [-sf <color>] [-v]\n");
 414 }
 415
 416 /* extern */
 417
 418 int screen;
 419 Display *dpy;
 420 DC dc = {0};
 421
 422 int
 423 main(int argc, char *argv[]) {
 424         Bool bottom = False;
 425         char *font = FONT;
 426         char *maxname;
 427         char *normbg = NORMBGCOLOR;
 428         char *normfg = NORMFGCOLOR;
 429         char *selbg = SELBGCOLOR;
 430         char *selfg = SELFGCOLOR;
 431         int i, j;
 432         Item *itm;
 433         XEvent ev;
 434         XModifierKeymap *modmap;
 435         XSetWindowAttributes wa;
 436
 437         /* command line args */
 438         for(i = 1; i < argc; i++)
 439                 if(!strncmp(argv[i], "-b", 3)) {
 440                         bottom = True;
 441                 }
 442                 else if(!strncmp(argv[i], "-fn", 4)) {
 443                         if(++i < argc) font = argv[i];
 444                 }
 445                 else if(!strncmp(argv[i], "-nb", 4)) {
 446                         if(++i < argc) normbg = argv[i];
 447                 }
 448                 else if(!strncmp(argv[i], "-nf", 4)) {
 449                         if(++i < argc) normfg = argv[i];
 450                 }
 451                 else if(!strncmp(argv[i], "-p", 3)) {
 452                         if(++i < argc) prompt = argv[i];
 453                 }
 454                 else if(!strncmp(argv[i], "-sb", 4)) {
 455                         if(++i < argc) selbg = argv[i];
 456                 }
 457                 else if(!strncmp(argv[i], "-sf", 4)) {
 458                         if(++i < argc) selfg = argv[i];
 459                 }
 460                 else if(!strncmp(argv[i], "-v", 3))
 461                         eprint("dmenu-"VERSION", (C)opyright MMVI-MMVII Anselm R. Garbe\n");
 462                 else
 463                         usage();
 464         setlocale(LC_CTYPE, "");
 465         dpy = XOpenDisplay(0);
 466         if(!dpy)
 467                 eprint("dmenu: cannot open display\n");
 468         screen = DefaultScreen(dpy);
 469         root = RootWindow(dpy, screen);
 470         if(isatty(STDIN_FILENO)) {
 471                 maxname = readstdin();
 472                 running = grabkeyboard();
 473         }
 474         else { /* prevent keypress loss */
 475                 running = grabkeyboard();
 476                 maxname = readstdin();
 477         }
 478         /* init modifier map */
 479         modmap = XGetModifierMapping(dpy);
 480         for (i = 0; i < 8; i++) {
 481                 for (j = 0; j < modmap->max_keypermod; j++) {
 482                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 483                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 484                                 numlockmask = (1 << i);
 485                 }
 486         }
 487         XFreeModifiermap(modmap);
 488         /* style */
 489         dc.norm[ColBG] = initcolor(normbg);
 490         dc.norm[ColFG] = initcolor(normfg);
 491         dc.sel[ColBG] = initcolor(selbg);
 492         dc.sel[ColFG] = initcolor(selfg);
 493         initfont(font);
 494         /* menu window */
 495         wa.override_redirect = 1;
 496         wa.background_pixmap = ParentRelative;
 497         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 498         mw = DisplayWidth(dpy, screen);
 499         mh = dc.font.height + 2;
 500         win = XCreateWindow(dpy, root, 0,
 501                         bottom ? DisplayHeight(dpy, screen) - mh : 0, mw, mh, 0,
 502                         DefaultDepth(dpy, screen), CopyFromParent,
 503                         DefaultVisual(dpy, screen),
 504                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 505         /* pixmap */
 506         dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
 507         dc.gc = XCreateGC(dpy, root, 0, 0);
 508         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 509         if(!dc.font.set)
 510                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 511         if(maxname)
 512                 cmdw = textw(maxname);
 513         if(cmdw > mw / 3)
 514                 cmdw = mw / 3;
 515         if(prompt)
 516                 promptw = textw(prompt);
 517         if(promptw > mw / 5)
 518                 promptw = mw / 5;
 519         text[0] = 0;
 520         match(text);
 521         XMapRaised(dpy, win);
 522         drawmenu();
 523         XSync(dpy, False);
 524
 525         /* main event loop */
 526         while(running && !XNextEvent(dpy, &ev))
 527                 switch (ev.type) {
 528                 default:        /* ignore all crap */
 529                         break;
 530                 case KeyPress:
 531                         kpress(&ev.xkey);
 532                         break;
 533                 case Expose:
 534                         if(ev.xexpose.count == 0)
 535                                 drawmenu();
 536                         break;
 537                 }
 538
 539         /* cleanup */
 540         while(allitems) {
 541                 itm = allitems->next;
 542                 free(allitems->text);
 543                 free(allitems);
 544                 allitems = itm;
 545         }
 546         if(dc.font.set)
 547                 XFreeFontSet(dpy, dc.font.set);
 548         else
 549                 XFreeFont(dpy, dc.font.xfont);
 550         XFreePixmap(dpy, dc.drawable);
 551         XFreeGC(dpy, dc.gc);
 552         XDestroyWindow(dpy, win);
 553         XUngrabKeyboard(dpy, CurrentTime);
 554         XCloseDisplay(dpy);
 555         return ret;
 556 }