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.w = textw(i->text);
  96                         if(dc.w > mw / 3)
  97                                 dc.w = mw / 3;
  98                         drawtext(i->text, sel == i, sel == i);
  99                         dc.x += dc.w;
 100                 }
 101
 102                 dc.x = mw - SPACE;
 103                 dc.w = SPACE;
 104                 drawtext(next ? ">" : NULL, False, False);
 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 {
 113         unsigned int plen;
 114         Item *i, *j;
 115
 116         if(!pattern)
 117                 return;
 118
 119         plen = strlen(pattern);
 120         item = j = NULL;
 121         nitem = 0;
 122
 123         for(i = allitems; i; i=i->next)
 124                 if(!plen || !strncmp(pattern, i->text, plen)) {
 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         for(i = allitems; i; i=i->next)
 135                 if(plen && strncmp(pattern, i->text, plen)
 136                                 && strstr(i->text, pattern)) {
 137                         if(!j)
 138                                 item = i;
 139                         else
 140                                 j->right = i;
 141                         i->left = j;
 142                         i->right = NULL;
 143                         j = i;
 144                         nitem++;
 145                 }
 146
 147         curr = prev = next = sel = item;
 148         calcoffsets();
 149 }
 150
 151 static void
 152 kpress(XKeyEvent * e)
 153 {
 154         char buf[32];
 155         int num, prev_nitem;
 156         unsigned int i, len;
 157         KeySym ksym;
 158
 159         len = strlen(text);
 160         buf[0] = 0;
 161         num = XLookupString(e, buf, sizeof(buf), &ksym, 0);
 162
 163         if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 164                         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 165                         || IsPrivateKeypadKey(ksym))
 166                 return;
 167
 168         /* first check if a control mask is omitted */
 169         if(e->state & ControlMask) {
 170                 switch (ksym) {
 171                 default:        /* ignore other control sequences */
 172                         return;
 173                         break;
 174                 case XK_h:
 175                         ksym = XK_BackSpace;
 176                         break;
 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) {
 212                         if(text)
 213                                 fprintf(stdout, "%s", text);
 214                 }
 215                 else if(sel)
 216                         fprintf(stdout, "%s", sel->text);
 217                 else if(text)
 218                         fprintf(stdout, "%s", text);
 219                 fflush(stdout);
 220                 done = True;
 221                 break;
 222         case XK_Escape:
 223                 ret = 1;
 224                 done = True;
 225                 break;
 226         case XK_BackSpace:
 227                 if((i = len)) {
 228                         prev_nitem = nitem;
 229                         do {
 230                                 text[--i] = 0;
 231                                 match(text);
 232                         } while(i && nitem && prev_nitem == nitem);
 233                         match(text);
 234                 }
 235                 break;
 236         default:
 237                 if(num && !iscntrl((int) buf[0])) {
 238                         buf[num] = 0;
 239                         if(len > 0)
 240                                 strncat(text, buf, sizeof(text));
 241                         else
 242                                 strncpy(text, buf, sizeof(text));
 243                         match(text);
 244                 }
 245         }
 246         drawmenu();
 247 }
 248
 249 static char *
 250 readstdin()
 251 {
 252         static char *maxname = NULL;
 253         char *p, buf[1024];
 254         unsigned int len = 0, max = 0;
 255         Item *i, *new;
 256
 257         i = 0;
 258         while(fgets(buf, sizeof(buf), stdin)) {
 259                 len = strlen(buf);
 260                 if (buf[len - 1] == '\n')
 261                         buf[len - 1] = 0;
 262                 p = estrdup(buf);
 263                 if(max < len) {
 264                         maxname = p;
 265                         max = len;
 266                 }
 267
 268                 new = emalloc(sizeof(Item));
 269                 new->next = new->left = new->right = NULL;
 270                 new->text = p;
 271                 if(!i)
 272                         allitems = new;
 273                 else
 274                         i->next = new;
 275                 i = new;
 276         }
 277
 278         return maxname;
 279 }
 280
 281 /* extern */
 282
 283 int screen;
 284 Display *dpy;
 285 DC dc = {0};
 286
 287 int
 288 main(int argc, char *argv[])
 289 {
 290         char *maxname;
 291         XEvent ev;
 292         XSetWindowAttributes wa;
 293
 294         if(argc == 2 && !strncmp("-v", argv[1], 3)) {
 295                 fputs("dmenu-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
 296                 exit(EXIT_SUCCESS);
 297         }
 298         else if(argc != 1)
 299                 eprint("usage: dmenu [-v]\n");
 300
 301         dpy = XOpenDisplay(0);
 302         if(!dpy)
 303                 eprint("dmenu: cannot open display\n");
 304         screen = DefaultScreen(dpy);
 305         root = RootWindow(dpy, screen);
 306
 307         maxname = readstdin();
 308
 309         /* grab as early as possible, but after reading all items!!! */
 310         while(XGrabKeyboard(dpy, root, True, GrabModeAsync,
 311                          GrabModeAsync, CurrentTime) != GrabSuccess)
 312                 usleep(1000);
 313
 314         /* style */
 315         dc.bg = getcolor(BGCOLOR);
 316         dc.fg = getcolor(FGCOLOR);
 317         dc.border = getcolor(BORDERCOLOR);
 318         setfont(FONT);
 319
 320         wa.override_redirect = 1;
 321         wa.background_pixmap = ParentRelative;
 322         wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
 323
 324         mx = my = 0;
 325         mw = DisplayWidth(dpy, screen);
 326         mh = dc.font.height + 4;
 327
 328         win = XCreateWindow(dpy, root, mx, my, mw, mh, 0,
 329                         DefaultDepth(dpy, screen), CopyFromParent,
 330                         DefaultVisual(dpy, screen),
 331                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 332         XDefineCursor(dpy, win, XCreateFontCursor(dpy, XC_xterm));
 333
 334         /* pixmap */
 335         dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
 336         dc.gc = XCreateGC(dpy, root, 0, 0);
 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(!done && !XNextEvent(dpy, &ev)) {
 351                 switch (ev.type) {
 352                 case KeyPress:
 353                         kpress(&ev.xkey);
 354                         break;
 355                 case Expose:
 356                         if(ev.xexpose.count == 0)
 357                                 drawmenu();
 358                         break;
 359                 default:
 360                         break;
 361                 }
 362         }
 363
 364         XUngrabKeyboard(dpy, CurrentTime);
 365         XFreePixmap(dpy, dc.drawable);
 366         XFreeGC(dpy, dc.gc);
 367         XDestroyWindow(dpy, win);
 368         XCloseDisplay(dpy);
 369
 370         return ret;
 371 }