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
   7 #include <ctype.h>
   8 #include <locale.h>
   9 #include <stdlib.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <sys/select.h>
  14 #include <sys/time.h>
  15 #include <X11/Xutil.h>
  16 #include <X11/keysym.h>
  17
  18 typedef struct Item Item;
  19 struct Item {
  20         Item *next;             /* traverses all items */
  21         Item *left, *right;     /* traverses items matching current search pattern */
  22         char *text;
  23 };
  24
  25 /* static */
  26
  27 static char text[4096];
  28 static char *prompt = NULL;
  29 static int mx, my, mw, mh;
  30 static int ret = 0;
  31 static int nitem = 0;
  32 static unsigned int cmdw = 0;
  33 static unsigned int promptw = 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 match(char *pattern) {
 113         unsigned int plen;
 114         Item *i, *j;
 115
 116         if(!pattern)
 117                 return;
 118         plen = strlen(pattern);
 119         item = j = NULL;
 120         nitem = 0;
 121         for(i = allitems; i; i=i->next)
 122                 if(!plen || !strncmp(pattern, i->text, plen)) {
 123                         if(!j)
 124                                 item = i;
 125                         else
 126                                 j->right = i;
 127                         i->left = j;
 128                         i->right = NULL;
 129                         j = i;
 130                         nitem++;
 131                 }
 132         for(i = allitems; i; i=i->next)
 133                 if(plen && strncmp(pattern, i->text, plen)
 134                                 && strstr(i->text, pattern)) {
 135                         if(!j)
 136                                 item = i;
 137                         else
 138                                 j->right = i;
 139                         i->left = j;
 140                         i->right = NULL;
 141                         j = i;
 142                         nitem++;
 143                 }
 144         curr = prev = next = sel = item;
 145         calcoffsets();
 146 }
 147
 148 static void
 149 kpress(XKeyEvent * e) {
 150         char buf[32];
 151         int num, prev_nitem;
 152         unsigned int i, len;
 153         KeySym ksym;
 154
 155         len = strlen(text);
 156         buf[0] = 0;
 157         num = XLookupString(e, buf, sizeof buf, &ksym, 0);
 158         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 159                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 160                         || IsPrivateKeypadKey(ksym))
 161                 return;
 162         /* first check if a control mask is omitted */
 163         if(e->state & ControlMask) {
 164                 switch (ksym) {
 165                 default:        /* ignore other control sequences */
 166                         return;
 167                 case XK_bracketleft:
 168                         ksym = XK_Escape;
 169                         break;
 170                 case XK_h:
 171                 case XK_H:
 172                         ksym = XK_BackSpace;
 173                         break;
 174                 case XK_u:
 175                 case XK_U:
 176                         text[0] = 0;
 177                         match(text);
 178                         drawmenu();
 179                         return;
 180                 }
 181         }
 182         if(e->state & Mod1Mask) {
 183                 switch(ksym) {
 184                 default: return;
 185                 case XK_h:
 186                         ksym = XK_Left;
 187                         break;
 188                 case XK_l:
 189                         ksym = XK_Right;
 190                         break;
 191                 case XK_j:
 192                         ksym = XK_Next;
 193                         break;
 194                 case XK_k:
 195                         ksym = XK_Prior;
 196                         break;
 197                 case XK_g:
 198                         ksym = XK_Home;
 199                         break;
 200                 case XK_G:
 201                         ksym = XK_End;
 202                         break;
 203                 }
 204         }
 205         switch(ksym) {
 206         default:
 207                 if(num && !iscntrl((int) buf[0])) {
 208                         buf[num] = 0;
 209                         if(len > 0)
 210                                 strncat(text, buf, sizeof text);
 211                         else
 212                                 strncpy(text, buf, sizeof text);
 213                         match(text);
 214                 }
 215                 break;
 216         case XK_BackSpace:
 217                 if((i = len)) {
 218                         prev_nitem = nitem;
 219                         do {
 220                                 text[--i] = 0;
 221                                 match(text);
 222                         } while(i && nitem && prev_nitem == nitem);
 223                         match(text);
 224                 }
 225                 break;
 226         case XK_End:
 227                 if(!item)
 228                         return;
 229                 while(next) {
 230                         sel = curr = next;
 231                         calcoffsets();
 232                 }
 233                 while(sel && sel->right)
 234                         sel = sel->right;
 235                 break;
 236         case XK_Escape:
 237                 ret = 1;
 238                 running = False;
 239                 break;
 240         case XK_Home:
 241                 if(!item)
 242                         return;
 243                 sel = curr = item;
 244                 calcoffsets();
 245                 break;
 246         case XK_Left:
 247                 if(!(sel && sel->left))
 248                         return;
 249                 sel=sel->left;
 250                 if(sel->right == curr) {
 251                         curr = prev;
 252                         calcoffsets();
 253                 }
 254                 break;
 255         case XK_Next:
 256                 if(!next)
 257                         return;
 258                 sel = curr = next;
 259                 calcoffsets();
 260                 break;
 261         case XK_Prior:
 262                 if(!prev)
 263                         return;
 264                 sel = curr = prev;
 265                 calcoffsets();
 266                 break;
 267         case XK_Return:
 268                 if((e->state & ShiftMask) && text)
 269                         fprintf(stdout, "%s", text);
 270                 else if(sel)
 271                         fprintf(stdout, "%s", sel->text);
 272                 else if(text)
 273                         fprintf(stdout, "%s", text);
 274                 fflush(stdout);
 275                 running = False;
 276                 break;
 277         case XK_Right:
 278                 if(!(sel && sel->right))
 279                         return;
 280                 sel=sel->right;
 281                 if(sel == next) {
 282                         curr = next;
 283                         calcoffsets();
 284                 }
 285                 break;
 286         case XK_Tab:
 287                 if(!sel)
 288                         return;
 289                 strncpy(text, sel->text, sizeof text);
 290                 match(text);
 291                 break;
 292         }
 293         drawmenu();
 294 }
 295
 296 static char *
 297 readstdin(void) {
 298         static char *maxname = NULL;
 299         char *p, buf[1024];
 300         unsigned int len = 0, max = 0;
 301         Item *i, *new;
 302
 303         i = 0;
 304         while(fgets(buf, sizeof buf, stdin)) {
 305                 len = strlen(buf);
 306                 if (buf[len - 1] == '\n')
 307                         buf[len - 1] = 0;
 308                 p = estrdup(buf);
 309                 if(max < len) {
 310                         maxname = p;
 311                         max = len;
 312                 }
 313                 new = emalloc(sizeof(Item));
 314                 new->next = new->left = new->right = NULL;
 315                 new->text = p;
 316                 if(!i)
 317                         allitems = new;
 318                 else
 319                         i->next = new;
 320                 i = new;
 321         }
 322
 323         return maxname;
 324 }
 325
 326 /* extern */
 327
 328 int screen;
 329 Display *dpy;
 330 DC dc = {0};
 331
 332 int
 333 main(int argc, char *argv[]) {
 334         Bool bottom = False;
 335         char *font = FONT;
 336         char *maxname;
 337         char *normbg = NORMBGCOLOR;
 338         char *normfg = NORMFGCOLOR;
 339         char *selbg = SELBGCOLOR;
 340         char *selfg = SELFGCOLOR;
 341         fd_set rd;
 342         int i;
 343         struct timeval timeout;
 344         Item *itm;
 345         XEvent ev;
 346         XSetWindowAttributes wa;
 347
 348         timeout.tv_usec = 0;
 349         timeout.tv_sec = 3;
 350         /* command line args */
 351         for(i = 1; i < argc; i++)
 352                 if(!strncmp(argv[i], "-b", 3)) {
 353                         bottom = True;
 354                 }
 355                 else if(!strncmp(argv[i], "-fn", 4)) {
 356                         if(++i < argc) font = argv[i];
 357                 }
 358                 else if(!strncmp(argv[i], "-nb", 4)) {
 359                         if(++i < argc) normbg = argv[i];
 360                 }
 361                 else if(!strncmp(argv[i], "-nf", 4)) {
 362                         if(++i < argc) normfg = argv[i];
 363                 }
 364                 else if(!strncmp(argv[i], "-p", 3)) {
 365                         if(++i < argc) prompt = argv[i];
 366                 }
 367                 else if(!strncmp(argv[i], "-sb", 4)) {
 368                         if(++i < argc) selbg = argv[i];
 369                 }
 370                 else if(!strncmp(argv[i], "-sf", 4)) {
 371                         if(++i < argc) selfg = argv[i];
 372                 }
 373                 else if(!strncmp(argv[i], "-t", 3)) {
 374                         if(++i < argc) timeout.tv_sec = atoi(argv[i]);
 375                 }
 376                 else if(!strncmp(argv[i], "-v", 3)) {
 377                         fputs("dmenu-"VERSION", (C)opyright MMVI-MMVII Anselm R. Garbe\n", stdout);
 378                         exit(EXIT_SUCCESS);
 379                 }
 380                 else
 381                         eprint("usage: dmenu [-b] [-fn <font>] [-nb <color>] [-nf <color>] [-p <prompt>]\n"
 382                                 "             [-sb <color>] [-sf <color>] [-t <seconds>] [-v]\n", stdout);
 383         setlocale(LC_CTYPE, "");
 384         dpy = XOpenDisplay(0);
 385         if(!dpy)
 386                 eprint("dmenu: cannot open display\n");
 387         screen = DefaultScreen(dpy);
 388         root = RootWindow(dpy, screen);
 389
 390         /* Note, the select() construction allows to grab all keypresses as
 391          * early as possible, to not loose them. But if there is no standard
 392          * input supplied, we will make sure to exit after MAX_WAIT_STDIN
 393          * seconds. This is convenience behavior for rapid typers.
 394          */
 395         while(XGrabKeyboard(dpy, root, True, GrabModeAsync,
 396                          GrabModeAsync, CurrentTime) != GrabSuccess)
 397                 usleep(1000);
 398         FD_ZERO(&rd);
 399         FD_SET(STDIN_FILENO, &rd);
 400         if(select(ConnectionNumber(dpy) + 1, &rd, NULL, NULL, &timeout) < 1)
 401                 goto UninitializedEnd;
 402         maxname = readstdin();
 403         /* style */
 404         dc.norm[ColBG] = getcolor(normbg);
 405         dc.norm[ColFG] = getcolor(normfg);
 406         dc.sel[ColBG] = getcolor(selbg);
 407         dc.sel[ColFG] = getcolor(selfg);
 408         setfont(font);
 409         /* menu window */
 410         wa.override_redirect = 1;
 411         wa.background_pixmap = ParentRelative;
 412         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 413         mx = my = 0;
 414         mw = DisplayWidth(dpy, screen);
 415         mh = dc.font.height + 2;
 416         if(bottom)
 417                 my += DisplayHeight(dpy, screen) - mh;
 418         win = XCreateWindow(dpy, root, mx, my, mw, mh, 0,
 419                         DefaultDepth(dpy, screen), CopyFromParent,
 420                         DefaultVisual(dpy, screen),
 421                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 422         /* pixmap */
 423         dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
 424         dc.gc = XCreateGC(dpy, root, 0, 0);
 425         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 426         if(maxname)
 427                 cmdw = textw(maxname);
 428         if(cmdw > mw / 3)
 429                 cmdw = mw / 3;
 430         if(prompt)
 431                 promptw = textw(prompt);
 432         if(promptw > mw / 5)
 433                 promptw = mw / 5;
 434         text[0] = 0;
 435         match(text);
 436         XMapRaised(dpy, win);
 437         drawmenu();
 438         XSync(dpy, False);
 439
 440         /* main event loop */
 441         while(running && !XNextEvent(dpy, &ev))
 442                 switch (ev.type) {
 443                 default:        /* ignore all crap */
 444                         break;
 445                 case KeyPress:
 446                         kpress(&ev.xkey);
 447                         break;
 448                 case Expose:
 449                         if(ev.xexpose.count == 0)
 450                                 drawmenu();
 451                         break;
 452                 }
 453
 454         /* cleanup */
 455         while(allitems) {
 456                 itm = allitems->next;
 457                 free(allitems->text);
 458                 free(allitems);
 459                 allitems = itm;
 460         }
 461         if(dc.font.set)
 462                 XFreeFontSet(dpy, dc.font.set);
 463         else
 464                 XFreeFont(dpy, dc.font.xfont);
 465         XFreePixmap(dpy, dc.drawable);
 466         XFreeGC(dpy, dc.gc);
 467         XDestroyWindow(dpy, win);
 468 UninitializedEnd:
 469         XUngrabKeyboard(dpy, CurrentTime);
 470         XCloseDisplay(dpy);
 471         return ret;
 472 }