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         missing = NULL;
 139         if(dc.font.set)
 140                 XFreeFontSet(dpy, dc.font.set);
 141         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 142         if(missing)
 143                 XFreeStringList(missing);
 144         if(dc.font.set) {
 145                 XFontSetExtents *font_extents;
 146                 XFontStruct **xfonts;
 147                 char **font_names;
 148                 dc.font.ascent = dc.font.descent = 0;
 149                 font_extents = XExtentsOfFontSet(dc.font.set);
 150                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 151                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 152                         if(dc.font.ascent < (*xfonts)->ascent)
 153                                 dc.font.ascent = (*xfonts)->ascent;
 154                         if(dc.font.descent < (*xfonts)->descent)
 155                                 dc.font.descent = (*xfonts)->descent;
 156                         xfonts++;
 157                 }
 158         }
 159         else {
 160                 if(dc.font.xfont)
 161                         XFreeFont(dpy, dc.font.xfont);
 162                 dc.font.xfont = NULL;
 163                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
 164                         eprint("error, cannot load font: '%s'\n", fontstr);
 165                 dc.font.ascent = dc.font.xfont->ascent;
 166                 dc.font.descent = dc.font.xfont->descent;
 167         }
 168         dc.font.height = dc.font.ascent + dc.font.descent;
 169 }
 170
 171 static void
 172 match(char *pattern) {
 173         unsigned int plen;
 174         Item *i, *j;
 175
 176         if(!pattern)
 177                 return;
 178         plen = strlen(pattern);
 179         item = j = NULL;
 180         nitem = 0;
 181         for(i = allitems; i; i=i->next)
 182                 if(!plen || !strncmp(pattern, i->text, plen)) {
 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         for(i = allitems; i; i=i->next)
 193                 if(plen && strncmp(pattern, i->text, plen)
 194                                 && strstr(i->text, pattern)) {
 195                         if(!j)
 196                                 item = i;
 197                         else
 198                                 j->right = i;
 199                         i->left = j;
 200                         i->right = NULL;
 201                         j = i;
 202                         nitem++;
 203                 }
 204         curr = prev = next = sel = item;
 205         calcoffsets();
 206 }
 207
 208 static void
 209 kpress(XKeyEvent * e) {
 210         char buf[32];
 211         int i, num;
 212         unsigned int len;
 213         KeySym ksym;
 214
 215         len = strlen(text);
 216         buf[0] = 0;
 217         num = XLookupString(e, buf, sizeof buf, &ksym, 0);
 218         if(IsKeypadKey(ksym)) {
 219                 if(ksym == XK_KP_Enter) {
 220                         ksym = XK_Return;
 221                 } else if(ksym >= XK_KP_0 && ksym <= XK_KP_9) {
 222                         ksym = (ksym - XK_KP_0) + XK_0;
 223                 }
 224         }
 225         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 226                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 227                         || IsPrivateKeypadKey(ksym))
 228                 return;
 229         /* first check if a control mask is omitted */
 230         if(e->state & ControlMask) {
 231                 switch (ksym) {
 232                 default:        /* ignore other control sequences */
 233                         return;
 234                 case XK_bracketleft:
 235                         ksym = XK_Escape;
 236                         break;
 237                 case XK_h:
 238                 case XK_H:
 239                         ksym = XK_BackSpace;
 240                         break;
 241                 case XK_i:
 242                 case XK_I:
 243                         ksym = XK_Tab;
 244                         break;
 245                 case XK_j:
 246                 case XK_J:
 247                         ksym = XK_Return;
 248                         break;
 249                 case XK_u:
 250                 case XK_U:
 251                         text[0] = 0;
 252                         match(text);
 253                         drawmenu();
 254                         return;
 255                 case XK_w:
 256                 case XK_W:
 257                         if(len) {
 258                                 i = len - 1;
 259                                 while(i >= 0 && text[i] == ' ')
 260                                         text[i--] = 0;
 261                                 while(i >= 0 && text[i] != ' ')
 262                                         text[i--] = 0;
 263                                 match(text);
 264                                 drawmenu();
 265                         }
 266                         return;
 267                 }
 268         }
 269         if(CLEANMASK(e->state) & Mod1Mask) {
 270                 switch(ksym) {
 271                 default: return;
 272                 case XK_h:
 273                         ksym = XK_Left;
 274                         break;
 275                 case XK_l:
 276                         ksym = XK_Right;
 277                         break;
 278                 case XK_j:
 279                         ksym = XK_Next;
 280                         break;
 281                 case XK_k:
 282                         ksym = XK_Prior;
 283                         break;
 284                 case XK_g:
 285                         ksym = XK_Home;
 286                         break;
 287                 case XK_G:
 288                         ksym = XK_End;
 289                         break;
 290                 }
 291         }
 292         switch(ksym) {
 293         default:
 294                 if(num && !iscntrl((int) buf[0])) {
 295                         buf[num] = 0;
 296                         if(len > 0)
 297                                 strncat(text, buf, sizeof text);
 298                         else
 299                                 strncpy(text, buf, sizeof text);
 300                         match(text);
 301                 }
 302                 break;
 303         case XK_BackSpace:
 304                 if(len) {
 305                         text[--len] = 0;
 306                         match(text);
 307                 }
 308                 break;
 309         case XK_End:
 310                 if(!item)
 311                         return;
 312                 while(next) {
 313                         sel = curr = next;
 314                         calcoffsets();
 315                 }
 316                 while(sel && sel->right)
 317                         sel = sel->right;
 318                 break;
 319         case XK_Escape:
 320                 ret = 1;
 321                 running = False;
 322                 break;
 323         case XK_Home:
 324                 if(!item)
 325                         return;
 326                 sel = curr = item;
 327                 calcoffsets();
 328                 break;
 329         case XK_Left:
 330                 if(!(sel && sel->left))
 331                         return;
 332                 sel=sel->left;
 333                 if(sel->right == curr) {
 334                         curr = prev;
 335                         calcoffsets();
 336                 }
 337                 break;
 338         case XK_Next:
 339                 if(!next)
 340                         return;
 341                 sel = curr = next;
 342                 calcoffsets();
 343                 break;
 344         case XK_Prior:
 345                 if(!prev)
 346                         return;
 347                 sel = curr = prev;
 348                 calcoffsets();
 349                 break;
 350         case XK_Return:
 351                 if((e->state & ShiftMask) && text)
 352                         fprintf(stdout, "%s", text);
 353                 else if(sel)
 354                         fprintf(stdout, "%s", sel->text);
 355                 else if(text)
 356                         fprintf(stdout, "%s", text);
 357                 fflush(stdout);
 358                 running = False;
 359                 break;
 360         case XK_Right:
 361                 if(!(sel && sel->right))
 362                         return;
 363                 sel=sel->right;
 364                 if(sel == next) {
 365                         curr = next;
 366                         calcoffsets();
 367                 }
 368                 break;
 369         case XK_Tab:
 370                 if(!sel)
 371                         return;
 372                 strncpy(text, sel->text, sizeof text);
 373                 match(text);
 374                 break;
 375         }
 376         drawmenu();
 377 }
 378
 379 static char *
 380 readstdin(void) {
 381         static char *maxname = NULL;
 382         char *p, buf[1024];
 383         unsigned int len = 0, max = 0;
 384         Item *i, *new;
 385
 386         i = 0;
 387         while(fgets(buf, sizeof buf, stdin)) {
 388                 len = strlen(buf);
 389                 if (buf[len - 1] == '\n')
 390                         buf[len - 1] = 0;
 391                 p = estrdup(buf);
 392                 if(max < len) {
 393                         maxname = p;
 394                         max = len;
 395                 }
 396                 new = emalloc(sizeof(Item));
 397                 new->next = new->left = new->right = NULL;
 398                 new->text = p;
 399                 if(!i)
 400                         allitems = new;
 401                 else
 402                         i->next = new;
 403                 i = new;
 404         }
 405
 406         return maxname;
 407 }
 408
 409 static void
 410 usage(void) {
 411         eprint("usage: dmenu [-b] [-fn <font>] [-nb <color>] [-nf <color>]\n"
 412                 "             [-p <prompt>] [-sb <color>] [-sf <color>] [-v]\n");
 413 }
 414
 415 /* extern */
 416
 417 int screen;
 418 Display *dpy;
 419 DC dc = {0};
 420
 421 int
 422 main(int argc, char *argv[]) {
 423         Bool bottom = False;
 424         char *font = FONT;
 425         char *maxname;
 426         char *normbg = NORMBGCOLOR;
 427         char *normfg = NORMFGCOLOR;
 428         char *selbg = SELBGCOLOR;
 429         char *selfg = SELFGCOLOR;
 430         int i, j;
 431         Item *itm;
 432         XEvent ev;
 433         XModifierKeymap *modmap;
 434         XSetWindowAttributes wa;
 435
 436         /* command line args */
 437         for(i = 1; i < argc; i++)
 438                 if(!strncmp(argv[i], "-b", 3)) {
 439                         bottom = True;
 440                 }
 441                 else if(!strncmp(argv[i], "-fn", 4)) {
 442                         if(++i < argc) font = argv[i];
 443                 }
 444                 else if(!strncmp(argv[i], "-nb", 4)) {
 445                         if(++i < argc) normbg = argv[i];
 446                 }
 447                 else if(!strncmp(argv[i], "-nf", 4)) {
 448                         if(++i < argc) normfg = argv[i];
 449                 }
 450                 else if(!strncmp(argv[i], "-p", 3)) {
 451                         if(++i < argc) prompt = argv[i];
 452                 }
 453                 else if(!strncmp(argv[i], "-sb", 4)) {
 454                         if(++i < argc) selbg = argv[i];
 455                 }
 456                 else if(!strncmp(argv[i], "-sf", 4)) {
 457                         if(++i < argc) selfg = argv[i];
 458                 }
 459                 else if(!strncmp(argv[i], "-v", 3))
 460                         eprint("dmenu-"VERSION", © 2006-2007 Anselm R. Garbe, Sander van Dijk\n");
 461                 else
 462                         usage();
 463         setlocale(LC_CTYPE, "");
 464         dpy = XOpenDisplay(0);
 465         if(!dpy)
 466                 eprint("dmenu: cannot open display\n");
 467         screen = DefaultScreen(dpy);
 468         root = RootWindow(dpy, screen);
 469         if(isatty(STDIN_FILENO)) {
 470                 maxname = readstdin();
 471                 running = grabkeyboard();
 472         }
 473         else { /* prevent keypress loss */
 474                 running = grabkeyboard();
 475                 maxname = readstdin();
 476         }
 477         /* init modifier map */
 478         modmap = XGetModifierMapping(dpy);
 479         for (i = 0; i < 8; i++) {
 480                 for (j = 0; j < modmap->max_keypermod; j++) {
 481                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 482                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 483                                 numlockmask = (1 << i);
 484                 }
 485         }
 486         XFreeModifiermap(modmap);
 487         /* style */
 488         dc.norm[ColBG] = initcolor(normbg);
 489         dc.norm[ColFG] = initcolor(normfg);
 490         dc.sel[ColBG] = initcolor(selbg);
 491         dc.sel[ColFG] = initcolor(selfg);
 492         initfont(font);
 493         /* menu window */
 494         wa.override_redirect = 1;
 495         wa.background_pixmap = ParentRelative;
 496         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 497         mw = DisplayWidth(dpy, screen);
 498         mh = dc.font.height + 2;
 499         win = XCreateWindow(dpy, root, 0,
 500                         bottom ? DisplayHeight(dpy, screen) - mh : 0, mw, mh, 0,
 501                         DefaultDepth(dpy, screen), CopyFromParent,
 502                         DefaultVisual(dpy, screen),
 503                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 504         /* pixmap */
 505         dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
 506         dc.gc = XCreateGC(dpy, root, 0, 0);
 507         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 508         if(!dc.font.set)
 509                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 510         if(maxname)
 511                 cmdw = textw(maxname);
 512         if(cmdw > mw / 3)
 513                 cmdw = mw / 3;
 514         if(prompt)
 515                 promptw = textw(prompt);
 516         if(promptw > mw / 5)
 517                 promptw = mw / 5;
 518         text[0] = 0;
 519         match(text);
 520         XMapRaised(dpy, win);
 521         drawmenu();
 522         XSync(dpy, False);
 523
 524         /* main event loop */
 525         while(running && !XNextEvent(dpy, &ev))
 526                 switch (ev.type) {
 527                 default:        /* ignore all crap */
 528                         break;
 529                 case KeyPress:
 530                         kpress(&ev.xkey);
 531                         break;
 532                 case Expose:
 533                         if(ev.xexpose.count == 0)
 534                                 drawmenu();
 535                         break;
 536                 }
 537
 538         /* cleanup */
 539         while(allitems) {
 540                 itm = allitems->next;
 541                 free(allitems->text);
 542                 free(allitems);
 543                 allitems = itm;
 544         }
 545         if(dc.font.set)
 546                 XFreeFontSet(dpy, dc.font.set);
 547         else
 548                 XFreeFont(dpy, dc.font.xfont);
 549         XFreePixmap(dpy, dc.drawable);
 550         XFreeGC(dpy, dc.gc);
 551         XDestroyWindow(dpy, win);
 552         XUngrabKeyboard(dpy, CurrentTime);
 553         XCloseDisplay(dpy);
 554         return ret;
 555 }