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