main.c

   1 /*
   2  * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
   3  * (C)opyright MMVI Sander van Dijk <a dot h dot vandijk at gmail dot com>
   4  * See LICENSE file for license details.
   5  */
   6
   7 #include "dmenu.h"
   8
   9 #include <ctype.h>
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include <unistd.h>
  14 #include <sys/select.h>
  15 #include <sys/time.h>
  16 #include <X11/cursorfont.h>
  17 #include <X11/Xutil.h>
  18 #include <X11/keysym.h>
  19
  20 typedef struct Item Item;
  21 struct Item {
  22         Item *next;             /* traverses all items */
  23         Item *left, *right;     /* traverses items matching current search pattern */
  24         char *text;
  25 };
  26
  27 /* static */
  28
  29 static char text[4096];
  30 static int mx, my, mw, mh;
  31 static int ret = 0;
  32 static int nitem = 0;
  33 static unsigned int cmdw = 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
  51         w = cmdw + 2 * SPACE;
  52         for(next = curr; next; next=next->right) {
  53                 tw = textw(next->text);
  54                 if(tw > mw / 3)
  55                         tw = mw / 3;
  56                 w += tw;
  57                 if(w > mw)
  58                         break;
  59         }
  60
  61         w = cmdw + 2 * SPACE;
  62         for(prev = curr; prev && prev->left; prev=prev->left) {
  63                 tw = textw(prev->left->text);
  64                 if(tw > mw / 3)
  65                         tw = mw / 3;
  66                 w += tw;
  67                 if(w > mw)
  68                         break;
  69         }
  70 }
  71
  72 static void
  73 drawmenu(void) {
  74         Item *i;
  75
  76         dc.x = 0;
  77         dc.y = 0;
  78         dc.w = mw;
  79         dc.h = mh;
  80         drawtext(NULL, dc.norm);
  81
  82         /* print command */
  83         if(cmdw && item)
  84                 dc.w = cmdw;
  85         drawtext(text[0] ? text : NULL, dc.norm);
  86         dc.x += cmdw;
  87
  88         if(curr) {
  89                 dc.w = SPACE;
  90                 drawtext((curr && curr->left) ? "<" : NULL, dc.norm);
  91                 dc.x += dc.w;
  92
  93                 /* determine maximum items */
  94                 for(i = curr; i != next; i=i->right) {
  95                         dc.w = textw(i->text);
  96                         if(dc.w > mw / 3)
  97                                 dc.w = mw / 3;
  98                         drawtext(i->text, (sel == i) ? dc.sel : dc.norm);
  99                         dc.x += dc.w;
 100                 }
 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 void
 111 match(char *pattern) {
 112         unsigned int plen;
 113         Item *i, *j;
 114
 115         if(!pattern)
 116                 return;
 117
 118         plen = strlen(pattern);
 119         item = j = NULL;
 120         nitem = 0;
 121
 122         for(i = allitems; i; i=i->next)
 123                 if(!plen || !strncmp(pattern, i->text, plen)) {
 124                         if(!j)
 125                                 item = i;
 126                         else
 127                                 j->right = i;
 128                         i->left = j;
 129                         i->right = NULL;
 130                         j = i;
 131                         nitem++;
 132                 }
 133         for(i = allitems; i; i=i->next)
 134                 if(plen && strncmp(pattern, i->text, plen)
 135                                 && strstr(i->text, pattern)) {
 136                         if(!j)
 137                                 item = i;
 138                         else
 139                                 j->right = i;
 140                         i->left = j;
 141                         i->right = NULL;
 142                         j = i;
 143                         nitem++;
 144                 }
 145
 146         curr = prev = next = sel = item;
 147         calcoffsets();
 148 }
 149
 150 static void
 151 kpress(XKeyEvent * e) {
 152         char buf[32];
 153         int num, prev_nitem;
 154         unsigned int i, len;
 155         KeySym ksym;
 156
 157         len = strlen(text);
 158         buf[0] = 0;
 159         num = XLookupString(e, buf, sizeof(buf), &ksym, 0);
 160
 161         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 162                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 163                         || IsPrivateKeypadKey(ksym))
 164                 return;
 165
 166         /* first check if a control mask is omitted */
 167         if(e->state & ControlMask) {
 168                 switch (ksym) {
 169                 default:        /* ignore other control sequences */
 170                         return;
 171                         break;
 172                 case XK_h:
 173                 case XK_H:
 174                         ksym = XK_BackSpace;
 175                         break;
 176                 case XK_u:
 177                 case XK_U:
 178                         text[0] = 0;
 179                         match(text);
 180                         drawmenu();
 181                         return;
 182                         break;
 183                 }
 184         }
 185         switch(ksym) {
 186         case XK_Left:
 187                 if(!(sel && sel->left))
 188                         return;
 189                 sel=sel->left;
 190                 if(sel->right == curr) {
 191                         curr = prev;
 192                         calcoffsets();
 193                 }
 194                 break;
 195         case XK_Tab:
 196                 if(!sel)
 197                         return;
 198                 strncpy(text, sel->text, sizeof(text));
 199                 match(text);
 200                 break;
 201         case XK_Right:
 202                 if(!(sel && sel->right))
 203                         return;
 204                 sel=sel->right;
 205                 if(sel == next) {
 206                         curr = next;
 207                         calcoffsets();
 208                 }
 209                 break;
 210         case XK_Return:
 211                 if((e->state & ShiftMask) && text)
 212                         fprintf(stdout, "%s", text);
 213                 else if(sel)
 214                         fprintf(stdout, "%s", sel->text);
 215                 else if(text)
 216                         fprintf(stdout, "%s", text);
 217                 fflush(stdout);
 218                 running = False;
 219                 break;
 220         case XK_Escape:
 221                 ret = 1;
 222                 running = False;
 223                 break;
 224         case XK_BackSpace:
 225                 if((i = len)) {
 226                         prev_nitem = nitem;
 227                         do {
 228                                 text[--i] = 0;
 229                                 match(text);
 230                         } while(i && nitem && prev_nitem == nitem);
 231                         match(text);
 232                 }
 233                 break;
 234         default:
 235                 if(num && !iscntrl((int) buf[0])) {
 236                         buf[num] = 0;
 237                         if(len > 0)
 238                                 strncat(text, buf, sizeof(text));
 239                         else
 240                                 strncpy(text, buf, sizeof(text));
 241                         match(text);
 242                 }
 243         }
 244         drawmenu();
 245 }
 246
 247 static char *
 248 readstdin(void) {
 249         static char *maxname = NULL;
 250         char *p, buf[1024];
 251         unsigned int len = 0, max = 0;
 252         Item *i, *new;
 253
 254         i = 0;
 255         while(fgets(buf, sizeof(buf), stdin)) {
 256                 len = strlen(buf);
 257                 if (buf[len - 1] == '\n')
 258                         buf[len - 1] = 0;
 259                 p = estrdup(buf);
 260                 if(max < len) {
 261                         maxname = p;
 262                         max = len;
 263                 }
 264
 265                 new = emalloc(sizeof(Item));
 266                 new->next = new->left = new->right = NULL;
 267                 new->text = p;
 268                 if(!i)
 269                         allitems = new;
 270                 else
 271                         i->next = new;
 272                 i = new;
 273         }
 274
 275         return maxname;
 276 }
 277
 278 /* extern */
 279
 280 int screen;
 281 Display *dpy;
 282 DC dc = {0};
 283
 284 int
 285 main(int argc, char *argv[]) {
 286         char *maxname;
 287         fd_set rd;
 288         struct timeval timeout;
 289         Item *i;
 290         XEvent ev;
 291         XSetWindowAttributes wa;
 292
 293         if(argc == 2 && !strncmp("-v", argv[1], 3)) {
 294                 fputs("dmenu-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
 295                 exit(EXIT_SUCCESS);
 296         }
 297         else if(argc != 1)
 298                 eprint("usage: dmenu [-v]\n");
 299
 300         dpy = XOpenDisplay(0);
 301         if(!dpy)
 302                 eprint("dmenu: cannot open display\n");
 303         screen = DefaultScreen(dpy);
 304         root = RootWindow(dpy, screen);
 305
 306         /* Note, the select() construction allows to grab all keypresses as
 307          * early as possible, to not loose them. But if there is no standard
 308          * input supplied, we will make sure to exit after MAX_WAIT_STDIN
 309          * seconds. This is convenience behavior for rapid typers.
 310          */
 311         while(XGrabKeyboard(dpy, root, True, GrabModeAsync,
 312                          GrabModeAsync, CurrentTime) != GrabSuccess)
 313                 usleep(1000);
 314
 315         timeout.tv_usec = 0;
 316         timeout.tv_sec = STDIN_TIMEOUT;
 317         FD_ZERO(&rd);
 318         FD_SET(STDIN_FILENO, &rd);
 319         if(select(ConnectionNumber(dpy) + 1, &rd, NULL, NULL, &timeout) < 1)
 320                 goto UninitializedEnd;
 321         maxname = readstdin();
 322
 323         /* style */
 324         dc.sel[ColBG] = getcolor(SELBGCOLOR);
 325         dc.sel[ColFG] = getcolor(SELFGCOLOR);
 326         dc.norm[ColBG] = getcolor(NORMBGCOLOR);
 327         dc.norm[ColFG] = getcolor(NORMFGCOLOR);
 328         setfont(FONT);
 329
 330         wa.override_redirect = 1;
 331         wa.background_pixmap = ParentRelative;
 332         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 333
 334         mx = my = 0;
 335         mw = DisplayWidth(dpy, screen);
 336         mh = dc.font.height + 2;
 337
 338         win = XCreateWindow(dpy, root, mx, my, mw, mh, 0,
 339                         DefaultDepth(dpy, screen), CopyFromParent,
 340                         DefaultVisual(dpy, screen),
 341                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 342         XDefineCursor(dpy, win, XCreateFontCursor(dpy, XC_xterm));
 343
 344         /* pixmap */
 345         dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
 346         dc.gc = XCreateGC(dpy, root, 0, 0);
 347         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 348
 349         if(maxname)
 350                 cmdw = textw(maxname);
 351         if(cmdw > mw / 3)
 352                 cmdw = mw / 3;
 353
 354         text[0] = 0;
 355         match(text);
 356         XMapRaised(dpy, win);
 357         drawmenu();
 358         XSync(dpy, False);
 359
 360         /* main event loop */
 361         while(running && !XNextEvent(dpy, &ev)) {
 362                 switch (ev.type) {
 363                 default:        /* ignore all crap */
 364                         break;
 365                 case KeyPress:
 366                         kpress(&ev.xkey);
 367                         break;
 368                 case Expose:
 369                         if(ev.xexpose.count == 0)
 370                                 drawmenu();
 371                         break;
 372                 }
 373         }
 374
 375         while(allitems) {
 376                 i = allitems->next;
 377                 free(allitems->text);
 378                 free(allitems);
 379                 allitems = i;
 380         }
 381         if(dc.font.set)
 382                 XFreeFontSet(dpy, dc.font.set);
 383         else
 384                 XFreeFont(dpy, dc.font.xfont);
 385         XFreePixmap(dpy, dc.drawable);
 386         XFreeGC(dpy, dc.gc);
 387         XDestroyWindow(dpy, win);
 388 UninitializedEnd:
 389         XUngrabKeyboard(dpy, CurrentTime);
 390         XCloseDisplay(dpy);
 391
 392         return ret;
 393 }