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 <stdlib.h>
   9 #include <stdio.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12 #include <sys/select.h>
  13 #include <sys/time.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 running = True;
  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(void) {
  44         unsigned int tw, w;
  45
  46         if(!curr)
  47                 return;
  48         w = cmdw + 2 * SPACE;
  49         for(next = curr; next; next=next->right) {
  50                 tw = textw(next->text);
  51                 if(tw > mw / 3)
  52                         tw = mw / 3;
  53                 w += tw;
  54                 if(w > mw)
  55                         break;
  56         }
  57         w = cmdw + 2 * SPACE;
  58         for(prev = curr; prev && prev->left; prev=prev->left) {
  59                 tw = textw(prev->left->text);
  60                 if(tw > mw / 3)
  61                         tw = mw / 3;
  62                 w += tw;
  63                 if(w > mw)
  64                         break;
  65         }
  66 }
  67
  68 static void
  69 drawmenu(void) {
  70         Item *i;
  71
  72         dc.x = 0;
  73         dc.y = 0;
  74         dc.w = mw;
  75         dc.h = mh;
  76         drawtext(NULL, dc.norm);
  77         /* print command */
  78         if(cmdw && item)
  79                 dc.w = cmdw;
  80         drawtext(text[0] ? text : NULL, dc.norm);
  81         dc.x += cmdw;
  82         if(curr) {
  83                 dc.w = SPACE;
  84                 drawtext((curr && curr->left) ? "<" : NULL, dc.norm);
  85                 dc.x += dc.w;
  86                 /* determine maximum items */
  87                 for(i = curr; i != next; i=i->right) {
  88                         dc.w = textw(i->text);
  89                         if(dc.w > mw / 3)
  90                                 dc.w = mw / 3;
  91                         drawtext(i->text, (sel == i) ? dc.sel : dc.norm);
  92                         dc.x += dc.w;
  93                 }
  94                 dc.x = mw - SPACE;
  95                 dc.w = SPACE;
  96                 drawtext(next ? ">" : NULL, dc.norm);
  97         }
  98         XCopyArea(dpy, dc.drawable, win, dc.gc, 0, 0, mw, mh, 0, 0);
  99         XFlush(dpy);
 100 }
 101
 102 static void
 103 match(char *pattern) {
 104         unsigned int plen;
 105         Item *i, *j;
 106
 107         if(!pattern)
 108                 return;
 109         plen = strlen(pattern);
 110         item = j = NULL;
 111         nitem = 0;
 112         for(i = allitems; i; i=i->next)
 113                 if(!plen || !strncmp(pattern, i->text, plen)) {
 114                         if(!j)
 115                                 item = i;
 116                         else
 117                                 j->right = i;
 118                         i->left = j;
 119                         i->right = NULL;
 120                         j = i;
 121                         nitem++;
 122                 }
 123         for(i = allitems; i; i=i->next)
 124                 if(plen && strncmp(pattern, i->text, plen)
 125                                 && strstr(i->text, pattern)) {
 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         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         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 150                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 151                         || IsPrivateKeypadKey(ksym))
 152                 return;
 153         /* first check if a control mask is omitted */
 154         if(e->state & ControlMask) {
 155                 switch (ksym) {
 156                 default:        /* ignore other control sequences */
 157                         return;
 158                         break;
 159                 case XK_h:
 160                 case XK_H:
 161                         ksym = XK_BackSpace;
 162                         break;
 163                 case XK_u:
 164                 case XK_U:
 165                         text[0] = 0;
 166                         match(text);
 167                         drawmenu();
 168                         return;
 169                         break;
 170                 }
 171         }
 172         switch(ksym) {
 173         case XK_Left:
 174                 if(!(sel && sel->left))
 175                         return;
 176                 sel=sel->left;
 177                 if(sel->right == curr) {
 178                         curr = prev;
 179                         calcoffsets();
 180                 }
 181                 break;
 182         case XK_Tab:
 183                 if(!sel)
 184                         return;
 185                 strncpy(text, sel->text, sizeof(text));
 186                 match(text);
 187                 break;
 188         case XK_Right:
 189                 if(!(sel && sel->right))
 190                         return;
 191                 sel=sel->right;
 192                 if(sel == next) {
 193                         curr = next;
 194                         calcoffsets();
 195                 }
 196                 break;
 197         case XK_Return:
 198                 if((e->state & ShiftMask) && text)
 199                         fprintf(stdout, "%s", text);
 200                 else if(sel)
 201                         fprintf(stdout, "%s", sel->text);
 202                 else if(text)
 203                         fprintf(stdout, "%s", text);
 204                 fflush(stdout);
 205                 running = False;
 206                 break;
 207         case XK_Escape:
 208                 ret = 1;
 209                 running = False;
 210                 break;
 211         case XK_BackSpace:
 212                 if((i = len)) {
 213                         prev_nitem = nitem;
 214                         do {
 215                                 text[--i] = 0;
 216                                 match(text);
 217                         } while(i && nitem && prev_nitem == nitem);
 218                         match(text);
 219                 }
 220                 break;
 221         default:
 222                 if(num && !iscntrl((int) buf[0])) {
 223                         buf[num] = 0;
 224                         if(len > 0)
 225                                 strncat(text, buf, sizeof(text));
 226                         else
 227                                 strncpy(text, buf, sizeof(text));
 228                         match(text);
 229                 }
 230         }
 231         drawmenu();
 232 }
 233
 234 static char *
 235 readstdin(void) {
 236         static char *maxname = NULL;
 237         char *p, buf[1024];
 238         unsigned int len = 0, max = 0;
 239         Item *i, *new;
 240
 241         i = 0;
 242         while(fgets(buf, sizeof(buf), stdin)) {
 243                 len = strlen(buf);
 244                 if (buf[len - 1] == '\n')
 245                         buf[len - 1] = 0;
 246                 p = estrdup(buf);
 247                 if(max < len) {
 248                         maxname = p;
 249                         max = len;
 250                 }
 251                 new = emalloc(sizeof(Item));
 252                 new->next = new->left = new->right = NULL;
 253                 new->text = p;
 254                 if(!i)
 255                         allitems = new;
 256                 else
 257                         i->next = new;
 258                 i = new;
 259         }
 260
 261         return maxname;
 262 }
 263
 264 /* extern */
 265
 266 int screen;
 267 Display *dpy;
 268 DC dc = {0};
 269
 270 int
 271 main(int argc, char *argv[]) {
 272         char *font = FONT;
 273         char *maxname;
 274         char *normbg = NORMBGCOLOR;
 275         char *normfg = NORMFGCOLOR;
 276         char *selbg = SELBGCOLOR;
 277         char *selfg = SELFGCOLOR;
 278         fd_set rd;
 279         int i;
 280         struct timeval timeout;
 281         Item *itm;
 282         XEvent ev;
 283         XSetWindowAttributes wa;
 284
 285         timeout.tv_usec = 0;
 286         timeout.tv_sec = 3;
 287         /* command line args */
 288         for(i = 1; i < argc; i++)
 289                 if(!strncmp(argv[i], "-font", 6))
 290                         font = argv[++i];
 291                 else if(!strncmp(argv[i], "-normbg", 8))
 292                         normbg = argv[++i];
 293                 else if(!strncmp(argv[i], "-normfg", 8))
 294                         normfg = argv[++i];
 295                 else if(!strncmp(argv[i], "-selbg", 7))
 296                         selbg = argv[++i];
 297                 else if(!strncmp(argv[i], "-selfg", 7))
 298                         selfg = argv[++i];
 299                 else if(!strncmp(argv[i], "-t", 3))
 300                         timeout.tv_sec = atoi(argv[++i]);
 301                 else if(!strncmp(argv[i], "-v", 3)) {
 302                         fputs("dmenu-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
 303                         exit(EXIT_SUCCESS);
 304                 }
 305                 else
 306                         eprint("usage: dmenu [-font <name>] [-{norm,sel}{bg,fg} <color>] [-t <seconds>] [-v]\n", stdout);
 307         dpy = XOpenDisplay(0);
 308         if(!dpy)
 309                 eprint("dmenu: cannot open display\n");
 310         screen = DefaultScreen(dpy);
 311         root = RootWindow(dpy, screen);
 312
 313         /* Note, the select() construction allows to grab all keypresses as
 314          * early as possible, to not loose them. But if there is no standard
 315          * input supplied, we will make sure to exit after MAX_WAIT_STDIN
 316          * seconds. This is convenience behavior for rapid typers.
 317          */
 318         while(XGrabKeyboard(dpy, root, True, GrabModeAsync,
 319                          GrabModeAsync, CurrentTime) != GrabSuccess)
 320                 usleep(1000);
 321         FD_ZERO(&rd);
 322         FD_SET(STDIN_FILENO, &rd);
 323         if(select(ConnectionNumber(dpy) + 1, &rd, NULL, NULL, &timeout) < 1)
 324                 goto UninitializedEnd;
 325         maxname = readstdin();
 326         /* style */
 327         dc.norm[ColBG] = getcolor(normbg);
 328         dc.norm[ColFG] = getcolor(normfg);
 329         dc.sel[ColBG] = getcolor(selbg);
 330         dc.sel[ColFG] = getcolor(selfg);
 331         setfont(font);
 332         /* menu window */
 333         wa.override_redirect = 1;
 334         wa.background_pixmap = ParentRelative;
 335         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 336         mx = my = 0;
 337         mw = DisplayWidth(dpy, screen);
 338         mh = dc.font.height + 2;
 339         win = XCreateWindow(dpy, root, mx, my, mw, mh, 0,
 340                         DefaultDepth(dpy, screen), CopyFromParent,
 341                         DefaultVisual(dpy, screen),
 342                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 343         XDefineCursor(dpy, win, XCreateFontCursor(dpy, XC_xterm));
 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         if(maxname)
 349                 cmdw = textw(maxname);
 350         if(cmdw > mw / 3)
 351                 cmdw = mw / 3;
 352         text[0] = 0;
 353         match(text);
 354         XMapRaised(dpy, win);
 355         drawmenu();
 356         XSync(dpy, False);
 357
 358         /* main event loop */
 359         while(running && !XNextEvent(dpy, &ev))
 360                 switch (ev.type) {
 361                 default:        /* ignore all crap */
 362                         break;
 363                 case KeyPress:
 364                         kpress(&ev.xkey);
 365                         break;
 366                 case Expose:
 367                         if(ev.xexpose.count == 0)
 368                                 drawmenu();
 369                         break;
 370                 }
 371
 372         /* cleanup */
 373         while(allitems) {
 374                 itm = allitems->next;
 375                 free(allitems->text);
 376                 free(allitems);
 377                 allitems = itm;
 378         }
 379         if(dc.font.set)
 380                 XFreeFontSet(dpy, dc.font.set);
 381         else
 382                 XFreeFont(dpy, dc.font.xfont);
 383         XFreePixmap(dpy, dc.drawable);
 384         XFreeGC(dpy, dc.gc);
 385         XDestroyWindow(dpy, win);
 386 UninitializedEnd:
 387         XUngrabKeyboard(dpy, CurrentTime);
 388         XCloseDisplay(dpy);
 389         return ret;
 390 }