menu.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 "config.h"
   8 #include "draw.h"
   9 #include "util.h"
  10
  11 #include <ctype.h>
  12 #include <stdlib.h>
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <unistd.h>
  16 #include <X11/cursorfont.h>
  17 #include <X11/Xutil.h>
  18 #include <X11/keysym.h>
  19
  20 typedef struct Item Item;
  21
  22 struct Item {
  23         Item *next;             /* traverses all items */
  24         Item *left, *right;     /* traverses items matching current search pattern */
  25         char *text;
  26 };
  27
  28 static Display *dpy;
  29 static Window root;
  30 static Window win;
  31 static Bool done = False;
  32
  33 static Item *allitem = NULL;    /* first of all items */
  34 static Item *item = NULL;       /* first of pattern matching items */
  35 static Item *sel = NULL;
  36 static Item *nextoff = NULL;
  37 static Item *prevoff = NULL;
  38 static Item *curroff = NULL;
  39
  40 static int screen, mx, my, mw, mh;
  41 static char *title = NULL;
  42 static char text[4096];
  43 static int ret = 0;
  44 static int nitem = 0;
  45 static unsigned int cmdw = 0;
  46 static unsigned int tw = 0;
  47 static unsigned int cw = 0;
  48 static const int seek = 30;             /* 30px */
  49
  50 static Brush brush = {0};
  51
  52 static void draw_menu();
  53 static void kpress(XKeyEvent * e);
  54
  55 static char version[] = "gridmenu - " VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
  56
  57 static void
  58 usage() { error("usage: gridmenu [-v] [-t <title>]\n"); }
  59
  60 static void
  61 update_offsets()
  62 {
  63         unsigned int tw, w = cmdw + 2 * seek;
  64
  65         if(!curroff)
  66                 return;
  67
  68         for(nextoff = curroff; nextoff; nextoff=nextoff->right) {
  69                 tw = textw(&brush.font, nextoff->text);
  70                 if(tw > mw / 3)
  71                         tw = mw / 3;
  72                 w += tw + brush.font.height;
  73                 if(w > mw)
  74                         break;
  75         }
  76
  77         w = cmdw + 2 * seek;
  78         for(prevoff = curroff; prevoff && prevoff->left; prevoff=prevoff->left) {
  79                 tw = textw(&brush.font, prevoff->left->text);
  80                 if(tw > mw / 3)
  81                         tw = mw / 3;
  82                 w += tw + brush.font.height;
  83                 if(w > mw)
  84                         break;
  85         }
  86 }
  87
  88 static void
  89 update_items(char *pattern)
  90 {
  91         unsigned int plen = strlen(pattern);
  92         Item *i, *j;
  93
  94         if(!pattern)
  95                 return;
  96
  97         if(!title || *pattern)
  98                 cmdw = cw;
  99         else
 100                 cmdw = tw;
 101
 102         item = j = NULL;
 103         nitem = 0;
 104
 105         for(i = allitem; i; i=i->next)
 106                 if(!plen || !strncmp(pattern, i->text, plen)) {
 107                         if(!j)
 108                                 item = i;
 109                         else
 110                                 j->right = i;
 111                         i->left = j;
 112                         i->right = NULL;
 113                         j = i;
 114                         nitem++;
 115                 }
 116         for(i = allitem; i; i=i->next)
 117                 if(plen && strncmp(pattern, i->text, plen)
 118                                 && strstr(i->text, pattern)) {
 119                         if(!j)
 120                                 item = i;
 121                         else
 122                                 j->right = i;
 123                         i->left = j;
 124                         i->right = NULL;
 125                         j = i;
 126                         nitem++;
 127                 }
 128
 129         curroff = prevoff = nextoff = sel = item;
 130
 131         update_offsets();
 132 }
 133
 134 /* creates brush structs for brush mode drawing */
 135 static void
 136 draw_menu()
 137 {
 138         Item *i;
 139
 140         brush.x = 0;
 141         brush.y = 0;
 142         brush.w = mw;
 143         brush.h = mh;
 144         draw(dpy, &brush, False, 0);
 145
 146         /* print command */
 147         if(!title || text[0]) {
 148                 cmdw = cw;
 149                 if(cmdw && item)
 150                         brush.w = cmdw;
 151                 draw(dpy, &brush, False, text);
 152         }
 153         else {
 154                 cmdw = tw;
 155                 brush.w = cmdw;
 156                 draw(dpy, &brush, False, title);
 157         }
 158         brush.x += brush.w;
 159
 160         if(curroff) {
 161                 brush.w = seek;
 162                 draw(dpy, &brush, False, (curroff && curroff->left) ? "<" : 0);
 163                 brush.x += brush.w;
 164
 165                 /* determine maximum items */
 166                 for(i = curroff; i != nextoff; i=i->right) {
 167                         brush.border = False;
 168                         brush.w = textw(&brush.font, i->text);
 169                         if(brush.w > mw / 3)
 170                                 brush.w = mw / 3;
 171                         brush.w += brush.font.height;
 172                         if(sel == i) {
 173                                 swap((void **)&brush.fg, (void **)&brush.bg);
 174                                 draw(dpy, &brush, True, i->text);
 175                                 swap((void **)&brush.fg, (void **)&brush.bg);
 176                         }
 177                         else
 178                                 draw(dpy, &brush, False, i->text);
 179                         brush.x += brush.w;
 180                 }
 181
 182                 brush.x = mw - seek;
 183                 brush.w = seek;
 184                 draw(dpy, &brush, False, nextoff ? ">" : 0);
 185         }
 186         XCopyArea(dpy, brush.drawable, win, brush.gc, 0, 0, mw, mh, 0, 0);
 187         XFlush(dpy);
 188 }
 189
 190 static void
 191 kpress(XKeyEvent * e)
 192 {
 193         KeySym ksym;
 194         char buf[32];
 195         int num, prev_nitem;
 196         unsigned int i, len = strlen(text);
 197
 198         buf[0] = 0;
 199         num = XLookupString(e, buf, sizeof(buf), &ksym, 0);
 200
 201         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 202                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 203                         || IsPrivateKeypadKey(ksym))
 204                 return;
 205
 206         /* first check if a control mask is omitted */
 207         if(e->state & ControlMask) {
 208                 switch (ksym) {
 209                 default:        /* ignore other control sequences */
 210                         return;
 211                         break;
 212                 case XK_h:
 213                         ksym = XK_BackSpace;
 214                         break;
 215                 case XK_U:
 216                 case XK_u:
 217                         text[0] = 0;
 218                         update_items(text);
 219                         draw_menu();
 220                         return;
 221                         break;
 222                 case XK_bracketleft:
 223                         ksym = XK_Escape;
 224                         break;
 225                 }
 226         }
 227         switch(ksym) {
 228         case XK_Left:
 229                 if(!(sel && sel->left))
 230                         return;
 231                 sel=sel->left;
 232                 if(sel->right == curroff) {
 233                         curroff = prevoff;
 234                         update_offsets();
 235                 }
 236                 break;
 237         case XK_Tab:
 238                 if(!sel)
 239                         return;
 240                 strncpy(text, sel->text, sizeof(text));
 241                 update_items(text);
 242                 break;
 243         case XK_Right:
 244                 if(!(sel && sel->right))
 245                         return;
 246                 sel=sel->right;
 247                 if(sel == nextoff) {
 248                         curroff = nextoff;
 249                         update_offsets();
 250                 }
 251                 break;
 252         case XK_Return:
 253                 if(e->state & ShiftMask) {
 254                         if(text)
 255                                 fprintf(stdout, "%s", text);
 256                 }
 257                 else if(sel)
 258                         fprintf(stdout, "%s", sel->text);
 259                 else if(text)
 260                         fprintf(stdout, "%s", text);
 261                 fflush(stdout);
 262                 done = True;
 263                 break;
 264         case XK_Escape:
 265                 ret = 1;
 266                 done = True;
 267                 break;
 268         case XK_BackSpace:
 269                 if((i = len)) {
 270                         prev_nitem = nitem;
 271                         do {
 272                                 text[--i] = 0;
 273                                 update_items(text);
 274                         } while(i && nitem && prev_nitem == nitem);
 275                         update_items(text);
 276                 }
 277                 break;
 278         default:
 279                 if(num && !iscntrl((int) buf[0])) {
 280                         buf[num] = 0;
 281                         if(len > 0)
 282                                 strncat(text, buf, sizeof(text));
 283                         else
 284                                 strncpy(text, buf, sizeof(text));
 285                         update_items(text);
 286                 }
 287         }
 288         draw_menu();
 289 }
 290
 291 static char *
 292 read_allitems()
 293 {
 294         static char *maxname = NULL;
 295         char *p, buf[1024];
 296         unsigned int len = 0, max = 0;
 297         Item *i, *new;
 298
 299         i = 0;
 300         while(fgets(buf, sizeof(buf), stdin)) {
 301                 len = strlen(buf);
 302                 if (buf[len - 1] == '\n')
 303                         buf[len - 1] = 0;
 304                 p = estrdup(buf);
 305                 if(max < len) {
 306                         maxname = p;
 307                         max = len;
 308                 }
 309
 310                 new = emalloc(sizeof(Item));
 311                 new->next = new->left = new->right = NULL;
 312                 new->text = p;
 313                 if(!i)
 314                         allitem = new;
 315                 else
 316                         i->next = new;
 317                 i = new;
 318         }
 319
 320         return maxname;
 321 }
 322
 323 int
 324 main(int argc, char *argv[])
 325 {
 326         int i;
 327         XSetWindowAttributes wa;
 328         char *maxname;
 329         XEvent ev;
 330
 331         /* command line args */
 332         for(i = 1; i < argc; i++) {
 333                 if (argv[i][0] == '-')
 334                         switch (argv[i][1]) {
 335                         case 'v':
 336                                 fprintf(stdout, "%s", version);
 337                                 exit(0);
 338                                 break;
 339                         case 't':
 340                                 if(++i < argc)
 341                                         title = argv[i];
 342                                 else
 343                                         usage();
 344                                 break;
 345                         default:
 346                                 usage();
 347                                 break;
 348                         }
 349                 else
 350                         usage();
 351         }
 352
 353         dpy = XOpenDisplay(0);
 354         if(!dpy)
 355                 error("gridmenu: cannot open dpy\n");
 356         screen = DefaultScreen(dpy);
 357         root = RootWindow(dpy, screen);
 358
 359         maxname = read_allitems();
 360
 361         /* grab as early as possible, but after reading all items!!! */
 362         while(XGrabKeyboard(dpy, root, True, GrabModeAsync,
 363                          GrabModeAsync, CurrentTime) != GrabSuccess)
 364                 usleep(1000);
 365
 366         /* style */
 367         loadcolors(dpy, screen, &brush, BGCOLOR, FGCOLOR, BORDERCOLOR);
 368         loadfont(dpy, &brush.font, FONT);
 369
 370         wa.override_redirect = 1;
 371         wa.background_pixmap = ParentRelative;
 372         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 373
 374         mx = my = 0;
 375         mw = DisplayWidth(dpy, screen);
 376         mh = texth(&brush.font);
 377
 378         win = XCreateWindow(dpy, root, mx, my, mw, mh, 0,
 379                         DefaultDepth(dpy, screen), CopyFromParent,
 380                         DefaultVisual(dpy, screen),
 381                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 382         XDefineCursor(dpy, win, XCreateFontCursor(dpy, XC_xterm));
 383         XFlush(dpy);
 384
 385         /* pixmap */
 386         brush.gc = XCreateGC(dpy, root, 0, 0);
 387         brush.drawable = XCreatePixmap(dpy, win, mw, mh,
 388                         DefaultDepth(dpy, screen));
 389         XFlush(dpy);
 390
 391         if(maxname)
 392                 cw = textw(&brush.font, maxname) + brush.font.height;
 393         if(cw > mw / 3)
 394                 cw = mw / 3;
 395
 396         if(title) {
 397                 tw = textw(&brush.font, title) + brush.font.height;
 398                 if(tw > mw / 3)
 399                         tw = mw / 3;
 400         }
 401
 402         cmdw = title ? tw : cw;
 403
 404         text[0] = 0;
 405         update_items(text);
 406         XMapRaised(dpy, win);
 407         draw_menu();
 408         XFlush(dpy);
 409
 410         /* main event loop */
 411         while(!done && !XNextEvent(dpy, &ev)) {
 412                 switch (ev.type) {
 413                 case KeyPress:
 414                         kpress(&ev.xkey);
 415                         break;
 416                 case Expose:
 417                         if(ev.xexpose.count == 0)
 418                                 draw_menu();
 419                         break;
 420                 default:
 421                         break;
 422                 }
 423         }
 424
 425         XUngrabKeyboard(dpy, CurrentTime);
 426         XFreePixmap(dpy, brush.drawable);
 427         XFreeGC(dpy, brush.gc);
 428         XDestroyWindow(dpy, win);
 429         XCloseDisplay(dpy);
 430
 431         return ret;
 432 }