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 <X11/cursorfont.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 int mx, my, mw, mh;
  29 static int ret = 0;
  30 static int nitem = 0;
  31 static unsigned int cmdw = 0;
  32 static Bool done = False;
  33 static Item *allitems = NULL;   /* first of all items */
  34 static Item *item = NULL;       /* first of pattern matching items */
  35 static Item *sel = NULL;
  36 static Item *next = NULL;
  37 static Item *prev = NULL;
  38 static Item *curr = NULL;
  39 static Window root;
  40 static Window win;
  41
  42 static void
  43 calcoffsets()
  44 {
  45         unsigned int tw, w;
  46
  47         if(!curr)
  48                 return;
  49
  50         w = 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
  60         w = cmdw + 2 * SPACE;
  61         for(prev = curr; prev && prev->left; prev=prev->left) {
  62                 tw = textw(prev->left->text);
  63                 if(tw > mw / 3)
  64                         tw = mw / 3;
  65                 w += tw;
  66                 if(w > mw)
  67                         break;
  68         }
  69 }
  70
  71 static void
  72 drawmenu()
  73 {
  74         Item *i;
  75
  76         dc.x = 0;
  77         dc.y = 0;
  78         dc.w = mw;
  79         dc.h = mh;
  80         drawtext(NULL, False, False);
  81
  82         /* print command */
  83         if(cmdw && item)
  84                 dc.w = cmdw;
  85         drawtext(text[0] ? text : NULL, False, False);
  86         dc.x += cmdw;
  87
  88         if(curr) {
  89                 dc.w = SPACE;
  90                 drawtext((curr && curr->left) ? "<" : NULL, False, False);
  91                 dc.x += dc.w;
  92
  93                 /* determine maximum items */
  94                 for(i = curr; i != next; i=i->right) {
  95                         dc.border = False;
  96                         dc.w = textw(i->text);
  97                         if(dc.w > mw / 3)
  98                                 dc.w = mw / 3;
  99                         drawtext(i->text, sel == i, sel == i);
 100                         dc.x += dc.w;
 101                 }
 102
 103                 dc.x = mw - SPACE;
 104                 dc.w = SPACE;
 105                 drawtext(next ? ">" : NULL, False, False);
 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 {
 114         unsigned int plen;
 115         Item *i, *j;
 116
 117         if(!pattern)
 118                 return;
 119
 120         plen = strlen(pattern);
 121         item = j = NULL;
 122         nitem = 0;
 123
 124         for(i = allitems; i; i=i->next)
 125                 if(!plen || !strncmp(pattern, i->text, plen)) {
 126                         if(!j)
 127                                 item = i;
 128                         else
 129                                 j->right = i;
 130                         i->left = j;
 131                         i->right = NULL;
 132                         j = i;
 133                         nitem++;
 134                 }
 135         for(i = allitems; i; i=i->next)
 136                 if(plen && strncmp(pattern, i->text, plen)
 137                                 && strstr(i->text, pattern)) {
 138                         if(!j)
 139                                 item = i;
 140                         else
 141                                 j->right = i;
 142                         i->left = j;
 143                         i->right = NULL;
 144                         j = i;
 145                         nitem++;
 146                 }
 147
 148         curr = prev = next = sel = item;
 149         calcoffsets();
 150 }
 151
 152 static void
 153 kpress(XKeyEvent * e)
 154 {
 155         char buf[32];
 156         int num, prev_nitem;
 157         unsigned int i, len;
 158         KeySym ksym;
 159
 160         len = strlen(text);
 161         buf[0] = 0;
 162         num = XLookupString(e, buf, sizeof(buf), &ksym, 0);
 163
 164         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 165                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 166                         || IsPrivateKeypadKey(ksym))
 167                 return;
 168
 169         /* first check if a control mask is omitted */
 170         if(e->state & ControlMask) {
 171                 switch (ksym) {
 172                 default:        /* ignore other control sequences */
 173                         return;
 174                         break;
 175                 case XK_h:
 176                         ksym = XK_BackSpace;
 177                         break;
 178                 case XK_U:
 179                 case XK_u:
 180                         text[0] = 0;
 181                         match(text);
 182                         drawmenu();
 183                         return;
 184                         break;
 185                 case XK_bracketleft:
 186                         ksym = XK_Escape;
 187                         break;
 188                 }
 189         }
 190         switch(ksym) {
 191         case XK_Left:
 192                 if(!(sel && sel->left))
 193                         return;
 194                 sel=sel->left;
 195                 if(sel->right == curr) {
 196                         curr = prev;
 197                         calcoffsets();
 198                 }
 199                 break;
 200         case XK_Tab:
 201                 if(!sel)
 202                         return;
 203                 strncpy(text, sel->text, sizeof(text));
 204                 match(text);
 205                 break;
 206         case XK_Right:
 207                 if(!(sel && sel->right))
 208                         return;
 209                 sel=sel->right;
 210                 if(sel == next) {
 211                         curr = next;
 212                         calcoffsets();
 213                 }
 214                 break;
 215         case XK_Return:
 216                 if(e->state & ShiftMask) {
 217                         if(text)
 218                                 fprintf(stdout, "%s", text);
 219                 }
 220                 else if(sel)
 221                         fprintf(stdout, "%s", sel->text);
 222                 else if(text)
 223                         fprintf(stdout, "%s", text);
 224                 fflush(stdout);
 225                 done = True;
 226                 break;
 227         case XK_Escape:
 228                 ret = 1;
 229                 done = True;
 230                 break;
 231         case XK_BackSpace:
 232                 if((i = len)) {
 233                         prev_nitem = nitem;
 234                         do {
 235                                 text[--i] = 0;
 236                                 match(text);
 237                         } while(i && nitem && prev_nitem == nitem);
 238                         match(text);
 239                 }
 240                 break;
 241         default:
 242                 if(num && !iscntrl((int) buf[0])) {
 243                         buf[num] = 0;
 244                         if(len > 0)
 245                                 strncat(text, buf, sizeof(text));
 246                         else
 247                                 strncpy(text, buf, sizeof(text));
 248                         match(text);
 249                 }
 250         }
 251         drawmenu();
 252 }
 253
 254 static char *
 255 readstdin()
 256 {
 257         static char *maxname = NULL;
 258         char *p, buf[1024];
 259         unsigned int len = 0, max = 0;
 260         Item *i, *new;
 261
 262         i = 0;
 263         while(fgets(buf, sizeof(buf), stdin)) {
 264                 len = strlen(buf);
 265                 if (buf[len - 1] == '\n')
 266                         buf[len - 1] = 0;
 267                 p = estrdup(buf);
 268                 if(max < len) {
 269                         maxname = p;
 270                         max = len;
 271                 }
 272
 273                 new = emalloc(sizeof(Item));
 274                 new->next = new->left = new->right = NULL;
 275                 new->text = p;
 276                 if(!i)
 277                         allitems = new;
 278                 else
 279                         i->next = new;
 280                 i = new;
 281         }
 282
 283         return maxname;
 284 }
 285
 286 /* extern */
 287
 288 int screen;
 289 Display *dpy;
 290 DC dc = {0};
 291
 292 int
 293 main(int argc, char *argv[])
 294 {
 295         char *maxname;
 296         XEvent ev;
 297         XSetWindowAttributes wa;
 298
 299         if(argc == 2 && !strncmp("-v", argv[1], 3)) {
 300                 fputs("dmenu-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
 301                 exit(EXIT_SUCCESS);
 302         }
 303         else if(argc != 1)
 304                 eprint("usage: dmenu [-v]\n");
 305
 306         dpy = XOpenDisplay(0);
 307         if(!dpy)
 308                 eprint("dmenu: cannot open display\n");
 309         screen = DefaultScreen(dpy);
 310         root = RootWindow(dpy, screen);
 311
 312         maxname = readstdin();
 313
 314         /* grab as early as possible, but after reading all items!!! */
 315         while(XGrabKeyboard(dpy, root, True, GrabModeAsync,
 316                          GrabModeAsync, CurrentTime) != GrabSuccess)
 317                 usleep(1000);
 318
 319         /* style */
 320         dc.bg = getcolor(BGCOLOR);
 321         dc.fg = getcolor(FGCOLOR);
 322         dc.border = getcolor(BORDERCOLOR);
 323         setfont(FONT);
 324
 325         wa.override_redirect = 1;
 326         wa.background_pixmap = ParentRelative;
 327         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 328
 329         mx = my = 0;
 330         mw = DisplayWidth(dpy, screen);
 331         mh = dc.font.height + 4;
 332
 333         win = XCreateWindow(dpy, root, mx, my, mw, mh, 0,
 334                         DefaultDepth(dpy, screen), CopyFromParent,
 335                         DefaultVisual(dpy, screen),
 336                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 337         XDefineCursor(dpy, win, XCreateFontCursor(dpy, XC_xterm));
 338
 339         /* pixmap */
 340         dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
 341         dc.gc = XCreateGC(dpy, root, 0, 0);
 342
 343         if(maxname)
 344                 cmdw = textw(maxname);
 345         if(cmdw > mw / 3)
 346                 cmdw = mw / 3;
 347
 348         text[0] = 0;
 349         match(text);
 350         XMapRaised(dpy, win);
 351         drawmenu();
 352         XSync(dpy, False);
 353
 354         /* main event loop */
 355         while(!done && !XNextEvent(dpy, &ev)) {
 356                 switch (ev.type) {
 357                 case KeyPress:
 358                         kpress(&ev.xkey);
 359                         break;
 360                 case Expose:
 361                         if(ev.xexpose.count == 0)
 362                                 drawmenu();
 363                         break;
 364                 default:
 365                         break;
 366                 }
 367         }
 368
 369         XUngrabKeyboard(dpy, CurrentTime);
 370         XFreePixmap(dpy, dc.drawable);
 371         XFreeGC(dpy, dc.gc);
 372         XDestroyWindow(dpy, win);
 373         XCloseDisplay(dpy);
 374
 375         return ret;
 376 }