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