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