main.c

   1 /* © 2006-2007 Anselm R. Garbe <garbeam at gmail dot com>
   2  * © 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
   3  * See LICENSE file for license details. */
   4 #include "dmenu.h"
   5 #include <ctype.h>
   6 #include <locale.h>
   7 #include <stdlib.h>
   8 #include <stdio.h>
   9 #include <string.h>
  10 #include <unistd.h>
  11 #include <X11/Xutil.h>
  12 #include <X11/keysym.h>
  13
  14 #define CLEANMASK(mask) (mask & ~(numlockmask | LockMask))
  15
  16 typedef struct Item Item;
  17 struct Item {
  18         Item *next;             /* traverses all items */
  19         Item *left, *right;     /* traverses items matching current search pattern */
  20         char *text;
  21 };
  22
  23 /* static */
  24
  25 static char text[4096];
  26 static char *prompt = NULL;
  27 static int mw, mh;
  28 static int ret = 0;
  29 static int nitem = 0;
  30 static unsigned int cmdw = 0;
  31 static unsigned int promptw = 0;
  32 static unsigned int numlockmask = 0;
  33 static Bool running = True;
  34 static Item *allitems = NULL;   /* first of all items */
  35 static Item *item = NULL;       /* first of pattern matching items */
  36 static Item *sel = NULL;
  37 static Item *next = NULL;
  38 static Item *prev = NULL;
  39 static Item *curr = NULL;
  40 static Window root;
  41 static Window win;
  42
  43 static void
  44 calcoffsets(void) {
  45         unsigned int tw, w;
  46
  47         if(!curr)
  48                 return;
  49         w = promptw + cmdw + 2 * SPACE;
  50         for(next = curr; next; next=next->right) {
  51                 tw = textw(next->text);
  52                 if(tw > mw / 3)
  53                         tw = mw / 3;
  54                 w += tw;
  55                 if(w > mw)
  56                         break;
  57         }
  58         w = promptw + cmdw + 2 * SPACE;
  59         for(prev = curr; prev && prev->left; prev=prev->left) {
  60                 tw = textw(prev->left->text);
  61                 if(tw > mw / 3)
  62                         tw = mw / 3;
  63                 w += tw;
  64                 if(w > mw)
  65                         break;
  66         }
  67 }
  68
  69 static void
  70 drawmenu(void) {
  71         Item *i;
  72
  73         dc.x = 0;
  74         dc.y = 0;
  75         dc.w = mw;
  76         dc.h = mh;
  77         drawtext(NULL, dc.norm);
  78         /* print prompt? */
  79         if(promptw) {
  80                 dc.w = promptw;
  81                 drawtext(prompt, dc.sel);
  82         }
  83         dc.x += promptw;
  84         dc.w = mw - promptw;
  85         /* print command */
  86         if(cmdw && item)
  87                 dc.w = cmdw;
  88         drawtext(text[0] ? text : NULL, dc.norm);
  89         dc.x += cmdw;
  90         if(curr) {
  91                 dc.w = SPACE;
  92                 drawtext((curr && curr->left) ? "<" : NULL, dc.norm);
  93                 dc.x += dc.w;
  94                 /* determine maximum items */
  95                 for(i = curr; i != next; i=i->right) {
  96                         dc.w = textw(i->text);
  97                         if(dc.w > mw / 3)
  98                                 dc.w = mw / 3;
  99                         drawtext(i->text, (sel == i) ? dc.sel : dc.norm);
 100                         dc.x += dc.w;
 101                 }
 102                 dc.x = mw - SPACE;
 103                 dc.w = SPACE;
 104                 drawtext(next ? ">" : NULL, dc.norm);
 105         }
 106         XCopyArea(dpy, dc.drawable, win, dc.gc, 0, 0, mw, mh, 0, 0);
 107         XFlush(dpy);
 108 }
 109
 110 static Bool
 111 grabkeyboard(void) {
 112         unsigned int len;
 113
 114         for(len = 1000; len; len--) {
 115                 if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
 116                         == GrabSuccess)
 117                         break;
 118                 usleep(1000);
 119         }
 120         return len > 0;
 121 }
 122
 123 static unsigned long
 124 initcolor(const char *colstr) {
 125         Colormap cmap = DefaultColormap(dpy, screen);
 126         XColor color;
 127
 128         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 129                 eprint("error, cannot allocate color '%s'\n", colstr);
 130         return color.pixel;
 131 }
 132
 133 static void
 134 initfont(const char *fontstr) {
 135         char *def, **missing;
 136         int i, n;
 137
 138         if(!fontstr || fontstr[0] == '\0')
 139                 eprint("error, cannot load font: '%s'\n", fontstr);
 140         missing = NULL;
 141         if(dc.font.set)
 142                 XFreeFontSet(dpy, dc.font.set);
 143         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 144         if(missing)
 145                 XFreeStringList(missing);
 146         if(dc.font.set) {
 147                 XFontSetExtents *font_extents;
 148                 XFontStruct **xfonts;
 149                 char **font_names;
 150                 dc.font.ascent = dc.font.descent = 0;
 151                 font_extents = XExtentsOfFontSet(dc.font.set);
 152                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 153                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 154                         if(dc.font.ascent < (*xfonts)->ascent)
 155                                 dc.font.ascent = (*xfonts)->ascent;
 156                         if(dc.font.descent < (*xfonts)->descent)
 157                                 dc.font.descent = (*xfonts)->descent;
 158                         xfonts++;
 159                 }
 160         }
 161         else {
 162                 if(dc.font.xfont)
 163                         XFreeFont(dpy, dc.font.xfont);
 164                 dc.font.xfont = NULL;
 165                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
 166                         eprint("error, cannot load font: '%s'\n", fontstr);
 167                 dc.font.ascent = dc.font.xfont->ascent;
 168                 dc.font.descent = dc.font.xfont->descent;
 169         }
 170         dc.font.height = dc.font.ascent + dc.font.descent;
 171 }
 172
 173 static void
 174 match(char *pattern) {
 175         unsigned int plen;
 176         Item *i, *j;
 177
 178         if(!pattern)
 179                 return;
 180         plen = strlen(pattern);
 181         item = j = NULL;
 182         nitem = 0;
 183         for(i = allitems; i; i=i->next)
 184                 if(!plen || !strncmp(pattern, i->text, plen)) {
 185                         if(!j)
 186                                 item = i;
 187                         else
 188                                 j->right = i;
 189                         i->left = j;
 190                         i->right = NULL;
 191                         j = i;
 192                         nitem++;
 193                 }
 194         for(i = allitems; i; i=i->next)
 195                 if(plen && strncmp(pattern, i->text, plen)
 196                                 && strstr(i->text, pattern)) {
 197                         if(!j)
 198                                 item = i;
 199                         else
 200                                 j->right = i;
 201                         i->left = j;
 202                         i->right = NULL;
 203                         j = i;
 204                         nitem++;
 205                 }
 206         curr = prev = next = sel = item;
 207         calcoffsets();
 208 }
 209
 210 static void
 211 kpress(XKeyEvent * e) {
 212         char buf[32];
 213         int i, num;
 214         unsigned int len;
 215         KeySym ksym;
 216
 217         len = strlen(text);
 218         buf[0] = 0;
 219         num = XLookupString(e, buf, sizeof buf, &ksym, 0);
 220         if(IsKeypadKey(ksym)) {
 221                 if(ksym == XK_KP_Enter) {
 222                         ksym = XK_Return;
 223                 } else if(ksym >= XK_KP_0 && ksym <= XK_KP_9) {
 224                         ksym = (ksym - XK_KP_0) + XK_0;
 225                 }
 226         }
 227         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 228                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 229                         || IsPrivateKeypadKey(ksym))
 230                 return;
 231         /* first check if a control mask is omitted */
 232         if(e->state & ControlMask) {
 233                 switch (ksym) {
 234                 default:        /* ignore other control sequences */
 235                         return;
 236                 case XK_bracketleft:
 237                         ksym = XK_Escape;
 238                         break;
 239                 case XK_h:
 240                 case XK_H:
 241                         ksym = XK_BackSpace;
 242                         break;
 243                 case XK_i:
 244                 case XK_I:
 245                         ksym = XK_Tab;
 246                         break;
 247                 case XK_j:
 248                 case XK_J:
 249                         ksym = XK_Return;
 250                         break;
 251                 case XK_u:
 252                 case XK_U:
 253                         text[0] = 0;
 254                         match(text);
 255                         drawmenu();
 256                         return;
 257                 case XK_w:
 258                 case XK_W:
 259                         if(len) {
 260                                 i = len - 1;
 261                                 while(i >= 0 && text[i] == ' ')
 262                                         text[i--] = 0;
 263                                 while(i >= 0 && text[i] != ' ')
 264                                         text[i--] = 0;
 265                                 match(text);
 266                                 drawmenu();
 267                         }
 268                         return;
 269                 }
 270         }
 271         if(CLEANMASK(e->state) & Mod1Mask) {
 272                 switch(ksym) {
 273                 default: return;
 274                 case XK_h:
 275                         ksym = XK_Left;
 276                         break;
 277                 case XK_l:
 278                         ksym = XK_Right;
 279                         break;
 280                 case XK_j:
 281                         ksym = XK_Next;
 282                         break;
 283                 case XK_k:
 284                         ksym = XK_Prior;
 285                         break;
 286                 case XK_g:
 287                         ksym = XK_Home;
 288                         break;
 289                 case XK_G:
 290                         ksym = XK_End;
 291                         break;
 292                 }
 293         }
 294         switch(ksym) {
 295         default:
 296                 if(num && !iscntrl((int) buf[0])) {
 297                         buf[num] = 0;
 298                         if(len > 0)
 299                                 strncat(text, buf, sizeof text);
 300                         else
 301                                 strncpy(text, buf, sizeof text);
 302                         match(text);
 303                 }
 304                 break;
 305         case XK_BackSpace:
 306                 if(len) {
 307                         text[--len] = 0;
 308                         match(text);
 309                 }
 310                 break;
 311         case XK_End:
 312                 if(!item)
 313                         return;
 314                 while(next) {
 315                         sel = curr = next;
 316                         calcoffsets();
 317                 }
 318                 while(sel && sel->right)
 319                         sel = sel->right;
 320                 break;
 321         case XK_Escape:
 322                 ret = 1;
 323                 running = False;
 324                 break;
 325         case XK_Home:
 326                 if(!item)
 327                         return;
 328                 sel = curr = item;
 329                 calcoffsets();
 330                 break;
 331         case XK_Left:
 332                 if(!(sel && sel->left))
 333                         return;
 334                 sel=sel->left;
 335                 if(sel->right == curr) {
 336                         curr = prev;
 337                         calcoffsets();
 338                 }
 339                 break;
 340         case XK_Next:
 341                 if(!next)
 342                         return;
 343                 sel = curr = next;
 344                 calcoffsets();
 345                 break;
 346         case XK_Prior:
 347                 if(!prev)
 348                         return;
 349                 sel = curr = prev;
 350                 calcoffsets();
 351                 break;
 352         case XK_Return:
 353                 if((e->state & ShiftMask) && text)
 354                         fprintf(stdout, "%s", text);
 355                 else if(sel)
 356                         fprintf(stdout, "%s", sel->text);
 357                 else if(text)
 358                         fprintf(stdout, "%s", text);
 359                 fflush(stdout);
 360                 running = False;
 361                 break;
 362         case XK_Right:
 363                 if(!(sel && sel->right))
 364                         return;
 365                 sel=sel->right;
 366                 if(sel == next) {
 367                         curr = next;
 368                         calcoffsets();
 369                 }
 370                 break;
 371         case XK_Tab:
 372                 if(!sel)
 373                         return;
 374                 strncpy(text, sel->text, sizeof text);
 375                 match(text);
 376                 break;
 377         }
 378         drawmenu();
 379 }
 380
 381 static char *
 382 readstdin(void) {
 383         static char *maxname = NULL;
 384         char *p, buf[1024];
 385         unsigned int len = 0, max = 0;
 386         Item *i, *new;
 387
 388         i = 0;
 389         while(fgets(buf, sizeof buf, stdin)) {
 390                 len = strlen(buf);
 391                 if (buf[len - 1] == '\n')
 392                         buf[len - 1] = 0;
 393                 p = estrdup(buf);
 394                 if(max < len) {
 395                         maxname = p;
 396                         max = len;
 397                 }
 398                 new = emalloc(sizeof(Item));
 399                 new->next = new->left = new->right = NULL;
 400                 new->text = p;
 401                 if(!i)
 402                         allitems = new;
 403                 else
 404                         i->next = new;
 405                 i = new;
 406         }
 407
 408         return maxname;
 409 }
 410
 411 static void
 412 usage(void) {
 413         eprint("usage: dmenu [-b] [-fn <font>] [-nb <color>] [-nf <color>]\n"
 414                 "             [-p <prompt>] [-sb <color>] [-sf <color>] [-v]\n");
 415 }
 416
 417 /* extern */
 418
 419 int screen;
 420 Display *dpy;
 421 DC dc = {0};
 422
 423 int
 424 main(int argc, char *argv[]) {
 425         Bool bottom = False;
 426         char *font = FONT;
 427         char *maxname;
 428         char *normbg = NORMBGCOLOR;
 429         char *normfg = NORMFGCOLOR;
 430         char *selbg = SELBGCOLOR;
 431         char *selfg = SELFGCOLOR;
 432         int i, j;
 433         Item *itm;
 434         XEvent ev;
 435         XModifierKeymap *modmap;
 436         XSetWindowAttributes wa;
 437
 438         /* command line args */
 439         for(i = 1; i < argc; i++)
 440                 if(!strncmp(argv[i], "-b", 3)) {
 441                         bottom = True;
 442                 }
 443                 else if(!strncmp(argv[i], "-fn", 4)) {
 444                         if(++i < argc) font = argv[i];
 445                 }
 446                 else if(!strncmp(argv[i], "-nb", 4)) {
 447                         if(++i < argc) normbg = argv[i];
 448                 }
 449                 else if(!strncmp(argv[i], "-nf", 4)) {
 450                         if(++i < argc) normfg = argv[i];
 451                 }
 452                 else if(!strncmp(argv[i], "-p", 3)) {
 453                         if(++i < argc) prompt = argv[i];
 454                 }
 455                 else if(!strncmp(argv[i], "-sb", 4)) {
 456                         if(++i < argc) selbg = argv[i];
 457                 }
 458                 else if(!strncmp(argv[i], "-sf", 4)) {
 459                         if(++i < argc) selfg = argv[i];
 460                 }
 461                 else if(!strncmp(argv[i], "-v", 3))
 462                         eprint("dmenu-"VERSION", © 2006-2007 Anselm R. Garbe, Sander van Dijk\n");
 463                 else
 464                         usage();
 465         setlocale(LC_CTYPE, "");
 466         dpy = XOpenDisplay(0);
 467         if(!dpy)
 468                 eprint("dmenu: cannot open display\n");
 469         screen = DefaultScreen(dpy);
 470         root = RootWindow(dpy, screen);
 471         if(isatty(STDIN_FILENO)) {
 472                 maxname = readstdin();
 473                 running = grabkeyboard();
 474         }
 475         else { /* prevent keypress loss */
 476                 running = grabkeyboard();
 477                 maxname = readstdin();
 478         }
 479         /* init modifier map */
 480         modmap = XGetModifierMapping(dpy);
 481         for (i = 0; i < 8; i++) {
 482                 for (j = 0; j < modmap->max_keypermod; j++) {
 483                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 484                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 485                                 numlockmask = (1 << i);
 486                 }
 487         }
 488         XFreeModifiermap(modmap);
 489         /* style */
 490         dc.norm[ColBG] = initcolor(normbg);
 491         dc.norm[ColFG] = initcolor(normfg);
 492         dc.sel[ColBG] = initcolor(selbg);
 493         dc.sel[ColFG] = initcolor(selfg);
 494         initfont(font);
 495         /* menu window */
 496         wa.override_redirect = 1;
 497         wa.background_pixmap = ParentRelative;
 498         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 499         mw = DisplayWidth(dpy, screen);
 500         mh = dc.font.height + 2;
 501         win = XCreateWindow(dpy, root, 0,
 502                         bottom ? DisplayHeight(dpy, screen) - mh : 0, mw, mh, 0,
 503                         DefaultDepth(dpy, screen), CopyFromParent,
 504                         DefaultVisual(dpy, screen),
 505                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 506         /* pixmap */
 507         dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
 508         dc.gc = XCreateGC(dpy, root, 0, 0);
 509         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 510         if(!dc.font.set)
 511                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 512         if(maxname)
 513                 cmdw = textw(maxname);
 514         if(cmdw > mw / 3)
 515                 cmdw = mw / 3;
 516         if(prompt)
 517                 promptw = textw(prompt);
 518         if(promptw > mw / 5)
 519                 promptw = mw / 5;
 520         text[0] = 0;
 521         match(text);
 522         XMapRaised(dpy, win);
 523         drawmenu();
 524         XSync(dpy, False);
 525
 526         /* main event loop */
 527         while(running && !XNextEvent(dpy, &ev))
 528                 switch (ev.type) {
 529                 default:        /* ignore all crap */
 530                         break;
 531                 case KeyPress:
 532                         kpress(&ev.xkey);
 533                         break;
 534                 case Expose:
 535                         if(ev.xexpose.count == 0)
 536                                 drawmenu();
 537                         break;
 538                 }
 539
 540         /* cleanup */
 541         while(allitems) {
 542                 itm = allitems->next;
 543                 free(allitems->text);
 544                 free(allitems);
 545                 allitems = itm;
 546         }
 547         if(dc.font.set)
 548                 XFreeFontSet(dpy, dc.font.set);
 549         else
 550                 XFreeFont(dpy, dc.font.xfont);
 551         XFreePixmap(dpy, dc.drawable);
 552         XFreeGC(dpy, dc.gc);
 553         XDestroyWindow(dpy, win);
 554         XUngrabKeyboard(dpy, CurrentTime);
 555         XCloseDisplay(dpy);
 556         return ret;
 557 }