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                                 strncmp(pattern, i->text, plen) && strstr(i->text, pattern)) {
 125                         if(!j)
 126                                 item = i;
 127                         else
 128                                 j->right = i;
 129                         i->left = j;
 130                         i->right = NULL;
 131                         j = i;
 132                         nitem++;
 133                 }
 134
 135         curr = prev = next = sel = item;
 136         calcoffsets();
 137 }
 138
 139 static void
 140 kpress(XKeyEvent * e) {
 141         char buf[32];
 142         int num, prev_nitem;
 143         unsigned int i, len;
 144         KeySym ksym;
 145
 146         len = strlen(text);
 147         buf[0] = 0;
 148         num = XLookupString(e, buf, sizeof(buf), &ksym, 0);
 149
 150         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 151                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 152                         || IsPrivateKeypadKey(ksym))
 153                 return;
 154
 155         /* first check if a control mask is omitted */
 156         if(e->state & ControlMask) {
 157                 switch (ksym) {
 158                 default:        /* ignore other control sequences */
 159                         return;
 160                         break;
 161                 case XK_h:
 162                 case XK_H:
 163                         ksym = XK_BackSpace;
 164                         break;
 165                 case XK_u:
 166                 case XK_U:
 167                         text[0] = 0;
 168                         match(text);
 169                         drawmenu();
 170                         return;
 171                         break;
 172                 }
 173         }
 174         switch(ksym) {
 175         case XK_Left:
 176                 if(!(sel && sel->left))
 177                         return;
 178                 sel=sel->left;
 179                 if(sel->right == curr) {
 180                         curr = prev;
 181                         calcoffsets();
 182                 }
 183                 break;
 184         case XK_Tab:
 185                 if(!sel)
 186                         return;
 187                 strncpy(text, sel->text, sizeof(text));
 188                 match(text);
 189                 break;
 190         case XK_Right:
 191                 if(!(sel && sel->right))
 192                         return;
 193                 sel=sel->right;
 194                 if(sel == next) {
 195                         curr = next;
 196                         calcoffsets();
 197                 }
 198                 break;
 199         case XK_Return:
 200                 if((e->state & ShiftMask) && text)
 201                         fprintf(stdout, "%s", text);
 202                 else if(sel)
 203                         fprintf(stdout, "%s", sel->text);
 204                 else if(text)
 205                         fprintf(stdout, "%s", text);
 206                 fflush(stdout);
 207                 running = False;
 208                 break;
 209         case XK_Escape:
 210                 ret = 1;
 211                 running = False;
 212                 break;
 213         case XK_BackSpace:
 214                 if((i = len)) {
 215                         prev_nitem = nitem;
 216                         do {
 217                                 text[--i] = 0;
 218                                 match(text);
 219                         } while(i && nitem && prev_nitem == nitem);
 220                         match(text);
 221                 }
 222                 break;
 223         default:
 224                 if(num && !iscntrl((int) buf[0])) {
 225                         buf[num] = 0;
 226                         if(len > 0)
 227                                 strncat(text, buf, sizeof(text));
 228                         else
 229                                 strncpy(text, buf, sizeof(text));
 230                         match(text);
 231                 }
 232         }
 233         drawmenu();
 234 }
 235
 236 static char *
 237 readstdin(void) {
 238         static char *maxname = NULL;
 239         char *p, buf[1024];
 240         unsigned int len = 0, max = 0;
 241         Item *i, *new;
 242
 243         i = 0;
 244         while(fgets(buf, sizeof(buf), stdin)) {
 245                 len = strlen(buf);
 246                 if (buf[len - 1] == '\n')
 247                         buf[len - 1] = 0;
 248                 p = estrdup(buf);
 249                 if(max < len) {
 250                         maxname = p;
 251                         max = len;
 252                 }
 253
 254                 new = emalloc(sizeof(Item));
 255                 new->next = new->left = new->right = NULL;
 256                 new->text = p;
 257                 if(!i)
 258                         allitems = new;
 259                 else
 260                         i->next = new;
 261                 i = new;
 262         }
 263
 264         return maxname;
 265 }
 266
 267 /* extern */
 268
 269 int screen;
 270 Display *dpy;
 271 DC dc = {0};
 272
 273 int
 274 main(int argc, char *argv[]) {
 275         char *maxname;
 276         fd_set rd;
 277         struct timeval timeout;
 278         Item *i;
 279         XEvent ev;
 280         XSetWindowAttributes wa;
 281
 282         if(argc == 2 && !strncmp("-v", argv[1], 3)) {
 283                 fputs("dmenu-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
 284                 exit(EXIT_SUCCESS);
 285         }
 286         else if(argc != 1)
 287                 eprint("usage: dmenu [-v]\n");
 288
 289         dpy = XOpenDisplay(0);
 290         if(!dpy)
 291                 eprint("dmenu: cannot open display\n");
 292         screen = DefaultScreen(dpy);
 293         root = RootWindow(dpy, screen);
 294
 295         /* Note, the select() construction allows to grab all keypresses as
 296          * early as possible, to not loose them. But if there is no standard
 297          * input supplied, we will make sure to exit after MAX_WAIT_STDIN
 298          * seconds. This is convenience behavior for rapid typers.
 299          */
 300         while(XGrabKeyboard(dpy, root, True, GrabModeAsync,
 301                          GrabModeAsync, CurrentTime) != GrabSuccess)
 302                 usleep(1000);
 303
 304         timeout.tv_usec = 0;
 305         timeout.tv_sec = STDIN_TIMEOUT;
 306         FD_ZERO(&rd);
 307         FD_SET(STDIN_FILENO, &rd);
 308         if(select(ConnectionNumber(dpy) + 1, &rd, NULL, NULL, &timeout) < 1)
 309                 goto UninitializedEnd;
 310         maxname = readstdin();
 311
 312         /* style */
 313         dc.sel[ColBG] = getcolor(SELBGCOLOR);
 314         dc.sel[ColFG] = getcolor(SELFGCOLOR);
 315         dc.norm[ColBG] = getcolor(NORMBGCOLOR);
 316         dc.norm[ColFG] = getcolor(NORMFGCOLOR);
 317         setfont(FONT);
 318
 319         wa.override_redirect = 1;
 320         wa.background_pixmap = ParentRelative;
 321         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 322
 323         mx = my = 0;
 324         mw = DisplayWidth(dpy, screen);
 325         mh = dc.font.height + 2;
 326
 327         win = XCreateWindow(dpy, root, mx, my, mw, mh, 0,
 328                         DefaultDepth(dpy, screen), CopyFromParent,
 329                         DefaultVisual(dpy, screen),
 330                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 331         XDefineCursor(dpy, win, XCreateFontCursor(dpy, XC_xterm));
 332
 333         /* pixmap */
 334         dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
 335         dc.gc = XCreateGC(dpy, root, 0, 0);
 336         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 337
 338         if(maxname)
 339                 cmdw = textw(maxname);
 340         if(cmdw > mw / 3)
 341                 cmdw = mw / 3;
 342
 343         text[0] = 0;
 344         match(text);
 345         XMapRaised(dpy, win);
 346         drawmenu();
 347         XSync(dpy, False);
 348
 349         /* main event loop */
 350         while(running && !XNextEvent(dpy, &ev)) {
 351                 switch (ev.type) {
 352                 default:        /* ignore all crap */
 353                         break;
 354                 case KeyPress:
 355                         kpress(&ev.xkey);
 356                         break;
 357                 case Expose:
 358                         if(ev.xexpose.count == 0)
 359                                 drawmenu();
 360                         break;
 361                 }
 362         }
 363
 364         while(allitems) {
 365                 i = allitems->next;
 366                 free(allitems->text);
 367                 free(allitems);
 368                 allitems = i;
 369         }
 370         if(dc.font.set)
 371                 XFreeFontSet(dpy, dc.font.set);
 372         else
 373                 XFreeFont(dpy, dc.font.xfont);
 374         XFreePixmap(dpy, dc.drawable);
 375         XFreeGC(dpy, dc.gc);
 376         XDestroyWindow(dpy, win);
 377 UninitializedEnd:
 378         XUngrabKeyboard(dpy, CurrentTime);
 379         XCloseDisplay(dpy);
 380
 381         return ret;
 382 }