main.c

   1 /* (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
   2  * (C)opyright MMVI 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                         break;
 168                 case XK_h:
 169                 case XK_H:
 170                         ksym = XK_BackSpace;
 171                         break;
 172                 case XK_u:
 173                 case XK_U:
 174                         text[0] = 0;
 175                         match(text);
 176                         drawmenu();
 177                         return;
 178                         break;
 179                 }
 180         }
 181         switch(ksym) {
 182         default:
 183                 if(num && !iscntrl((int) buf[0])) {
 184                         buf[num] = 0;
 185                         if(len > 0)
 186                                 strncat(text, buf, sizeof text);
 187                         else
 188                                 strncpy(text, buf, sizeof text);
 189                         match(text);
 190                 }
 191                 break;
 192         case XK_BackSpace:
 193                 if((i = len)) {
 194                         prev_nitem = nitem;
 195                         do {
 196                                 text[--i] = 0;
 197                                 match(text);
 198                         } while(i && nitem && prev_nitem == nitem);
 199                         match(text);
 200                 }
 201                 break;
 202         case XK_End:
 203                 if(!item)
 204                         return;
 205                 while(next) {
 206                         sel = curr = next;
 207                         calcoffsets();
 208                 }
 209                 while(sel && sel->right)
 210                         sel = sel->right;
 211                 break;
 212         case XK_Escape:
 213                 ret = 1;
 214                 running = False;
 215                 break;
 216         case XK_Home:
 217                 if(!item)
 218                         return;
 219                 sel = curr = item;
 220                 calcoffsets();
 221                 break;
 222         case XK_Left:
 223                 if(!(sel && sel->left))
 224                         return;
 225                 sel=sel->left;
 226                 if(sel->right == curr) {
 227                         curr = prev;
 228                         calcoffsets();
 229                 }
 230                 break;
 231         case XK_Next:
 232                 if(!next)
 233                         return;
 234                 sel = curr = next;
 235                 calcoffsets();
 236                 break;
 237         case XK_Prior:
 238                 if(!prev)
 239                         return;
 240                 sel = curr = prev;
 241                 calcoffsets();
 242                 break;
 243         case XK_Return:
 244                 if((e->state & ShiftMask) && text)
 245                         fprintf(stdout, "%s", text);
 246                 else if(sel)
 247                         fprintf(stdout, "%s", sel->text);
 248                 else if(text)
 249                         fprintf(stdout, "%s", text);
 250                 fflush(stdout);
 251                 running = False;
 252                 break;
 253         case XK_Right:
 254                 if(!(sel && sel->right))
 255                         return;
 256                 sel=sel->right;
 257                 if(sel == next) {
 258                         curr = next;
 259                         calcoffsets();
 260                 }
 261                 break;
 262         case XK_Tab:
 263                 if(!sel)
 264                         return;
 265                 strncpy(text, sel->text, sizeof text);
 266                 match(text);
 267                 break;
 268         }
 269         drawmenu();
 270 }
 271
 272 static char *
 273 readstdin(void) {
 274         static char *maxname = NULL;
 275         char *p, buf[1024];
 276         unsigned int len = 0, max = 0;
 277         Item *i, *new;
 278
 279         i = 0;
 280         while(fgets(buf, sizeof buf, stdin)) {
 281                 len = strlen(buf);
 282                 if (buf[len - 1] == '\n')
 283                         buf[len - 1] = 0;
 284                 p = estrdup(buf);
 285                 if(max < len) {
 286                         maxname = p;
 287                         max = len;
 288                 }
 289                 new = emalloc(sizeof(Item));
 290                 new->next = new->left = new->right = NULL;
 291                 new->text = p;
 292                 if(!i)
 293                         allitems = new;
 294                 else
 295                         i->next = new;
 296                 i = new;
 297         }
 298
 299         return maxname;
 300 }
 301
 302 /* extern */
 303
 304 int screen;
 305 Display *dpy;
 306 DC dc = {0};
 307
 308 int
 309 main(int argc, char *argv[]) {
 310         char *font = FONT;
 311         char *maxname;
 312         char *normbg = NORMBGCOLOR;
 313         char *normfg = NORMFGCOLOR;
 314         char *selbg = SELBGCOLOR;
 315         char *selfg = SELFGCOLOR;
 316         fd_set rd;
 317         int i;
 318         struct timeval timeout;
 319         Item *itm;
 320         XEvent ev;
 321         XSetWindowAttributes wa;
 322
 323         timeout.tv_usec = 0;
 324         timeout.tv_sec = 3;
 325         /* command line args */
 326         for(i = 1; i < argc; i++)
 327                 if(!strncmp(argv[i], "-font", 6)) {
 328                         if(++i < argc) font = argv[i];
 329                 }
 330                 else if(!strncmp(argv[i], "-normbg", 8)) {
 331                         if(++i < argc) normbg = argv[i];
 332                 }
 333                 else if(!strncmp(argv[i], "-normfg", 8)) {
 334                         if(++i < argc) normfg = argv[i];
 335                 }
 336                 else if(!strncmp(argv[i], "-selbg", 7)) {
 337                         if(++i < argc) selbg = argv[i];
 338                 }
 339                 else if(!strncmp(argv[i], "-selfg", 7)) {
 340                         if(++i < argc) selfg = argv[i];
 341                 }
 342                 else if(!strncmp(argv[i], "-p", 3)) {
 343                         if(++i < argc) prompt = argv[i];
 344                 }
 345                 else if(!strncmp(argv[i], "-t", 3)) {
 346                         if(++i < argc) timeout.tv_sec = atoi(argv[i]);
 347                 }
 348                 else if(!strncmp(argv[i], "-v", 3)) {
 349                         fputs("dmenu-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
 350                         exit(EXIT_SUCCESS);
 351                 }
 352                 else
 353                         eprint("usage: dmenu [-font <name>] [-{norm,sel}{bg,fg} <color>] [-p <prompt>] [-t <seconds>] [-v]\n", stdout);
 354         setlocale(LC_CTYPE, "");
 355         dpy = XOpenDisplay(0);
 356         if(!dpy)
 357                 eprint("dmenu: cannot open display\n");
 358         screen = DefaultScreen(dpy);
 359         root = RootWindow(dpy, screen);
 360
 361         /* Note, the select() construction allows to grab all keypresses as
 362          * early as possible, to not loose them. But if there is no standard
 363          * input supplied, we will make sure to exit after MAX_WAIT_STDIN
 364          * seconds. This is convenience behavior for rapid typers.
 365          */
 366         while(XGrabKeyboard(dpy, root, True, GrabModeAsync,
 367                          GrabModeAsync, CurrentTime) != GrabSuccess)
 368                 usleep(1000);
 369         FD_ZERO(&rd);
 370         FD_SET(STDIN_FILENO, &rd);
 371         if(select(ConnectionNumber(dpy) + 1, &rd, NULL, NULL, &timeout) < 1)
 372                 goto UninitializedEnd;
 373         maxname = readstdin();
 374         /* style */
 375         dc.norm[ColBG] = getcolor(normbg);
 376         dc.norm[ColFG] = getcolor(normfg);
 377         dc.sel[ColBG] = getcolor(selbg);
 378         dc.sel[ColFG] = getcolor(selfg);
 379         setfont(font);
 380         /* menu window */
 381         wa.override_redirect = 1;
 382         wa.background_pixmap = ParentRelative;
 383         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 384         mx = my = 0;
 385         mw = DisplayWidth(dpy, screen);
 386         mh = dc.font.height + 2;
 387         win = XCreateWindow(dpy, root, mx, my, mw, mh, 0,
 388                         DefaultDepth(dpy, screen), CopyFromParent,
 389                         DefaultVisual(dpy, screen),
 390                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 391         /* pixmap */
 392         dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
 393         dc.gc = XCreateGC(dpy, root, 0, 0);
 394         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 395         if(maxname)
 396                 cmdw = textw(maxname);
 397         if(cmdw > mw / 3)
 398                 cmdw = mw / 3;
 399         if(prompt)
 400                 promptw = textw(prompt);
 401         if(promptw > mw / 5)
 402                 promptw = mw / 5;
 403         text[0] = 0;
 404         match(text);
 405         XMapRaised(dpy, win);
 406         drawmenu();
 407         XSync(dpy, False);
 408
 409         /* main event loop */
 410         while(running && !XNextEvent(dpy, &ev))
 411                 switch (ev.type) {
 412                 default:        /* ignore all crap */
 413                         break;
 414                 case KeyPress:
 415                         kpress(&ev.xkey);
 416                         break;
 417                 case Expose:
 418                         if(ev.xexpose.count == 0)
 419                                 drawmenu();
 420                         break;
 421                 }
 422
 423         /* cleanup */
 424         while(allitems) {
 425                 itm = allitems->next;
 426                 free(allitems->text);
 427                 free(allitems);
 428                 allitems = itm;
 429         }
 430         if(dc.font.set)
 431                 XFreeFontSet(dpy, dc.font.set);
 432         else
 433                 XFreeFont(dpy, dc.font.xfont);
 434         XFreePixmap(dpy, dc.drawable);
 435         XFreeGC(dpy, dc.gc);
 436         XDestroyWindow(dpy, win);
 437 UninitializedEnd:
 438         XUngrabKeyboard(dpy, CurrentTime);
 439         XCloseDisplay(dpy);
 440         return ret;
 441 }