dinput.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <ctype.h>
   3 #include <locale.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <unistd.h>
   8 #include <X11/keysym.h>
   9 #include <X11/Xlib.h>
  10 #include <X11/Xutil.h>
  11 #ifdef XINERAMA
  12 #include <X11/extensions/Xinerama.h>
  13 #endif
  14 #include <draw.h>
  15
  16 /* macros */
  17 #define INRECT(X,Y,RX,RY,RW,RH) ((X) >= (RX) && (X) < (RX) + (RW) && (Y) >= (RY) && (Y) < (RY) + (RH))
  18 #define MIN(a, b)               ((a) < (b) ? (a) : (b))
  19 #define MAX(a, b)               ((a) > (b) ? (a) : (b))
  20 #define IS_UTF8_1ST_CHAR(c)     ((((c) & 0xc0) == 0xc0) || !((c) & 0x80))
  21
  22 /* forward declarations */
  23 static void cleanup(void);
  24 static void drawinput(void);
  25 static void grabkeyboard(void);
  26 static void kpress(XKeyEvent *e);
  27 static void run(void);
  28 static void setup(void);
  29
  30 #include "config.h"
  31
  32 /* variables */
  33 static char *prompt = NULL;
  34 static char text[4096];
  35 static int promptw = 0;
  36 static int screen;
  37 static size_t cursor = 0;
  38 static unsigned int numlockmask = 0;
  39 static unsigned int mw, mh;
  40 static unsigned long normcol[ColLast];
  41 static unsigned long selcol[ColLast];
  42 static Bool topbar = True;
  43 static DC dc;
  44 static Display *dpy;
  45 static Window win, root;
  46
  47 void
  48 cleanup(void) {
  49         cleanupdraw(&dc);
  50         XDestroyWindow(dpy, win);
  51         XUngrabKeyboard(dpy, CurrentTime);
  52         XCloseDisplay(dpy);
  53 }
  54
  55 void
  56 drawinput(void)
  57 {
  58         dc.x = 0;
  59         dc.y = 0;
  60         dc.w = mw;
  61         dc.h = mh;
  62         drawtext(&dc, NULL, normcol);
  63         /* print prompt? */
  64         if(prompt) {
  65                 dc.w = promptw;
  66                 drawtext(&dc, prompt, selcol);
  67                 dc.x += dc.w;
  68         }
  69         dc.w = mw - dc.x;
  70         drawtext(&dc, text, normcol);
  71         drawcursor(&dc, text, cursor, normcol);
  72         commitdraw(&dc, win);
  73 }
  74
  75 void
  76 grabkeyboard(void) {
  77         unsigned int len;
  78
  79         for(len = 1000; len; len--) {
  80                 if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
  81                 == GrabSuccess)
  82                         return;
  83                 usleep(1000);
  84         }
  85         exit(EXIT_FAILURE);
  86 }
  87
  88 void
  89 kpress(XKeyEvent *e) {
  90         char buf[sizeof text];
  91         int num;
  92         unsigned int i, len;
  93         KeySym ksym;
  94
  95         len = strlen(text);
  96         num = XLookupString(e, buf, sizeof buf, &ksym, NULL);
  97         if(ksym == XK_KP_Enter)
  98                 ksym = XK_Return;
  99         else if(ksym >= XK_KP_0 && ksym <= XK_KP_9)
 100                 ksym = (ksym - XK_KP_0) + XK_0;
 101         else if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 102         || IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 103         || IsPrivateKeypadKey(ksym))
 104                 return;
 105         /* first check if a control mask is omitted */
 106         if(e->state & ControlMask) {
 107                 switch(tolower(ksym)) {
 108                 default:
 109                         return;
 110                 case XK_a:
 111                         ksym = XK_Home;
 112                         break;
 113                 case XK_b:
 114                         ksym = XK_Left;
 115                         break;
 116                 case XK_c:
 117                         ksym = XK_Escape;
 118                         break;
 119                 case XK_e:
 120                         ksym = XK_End;
 121                         break;
 122                 case XK_f:
 123                         ksym = XK_Right;
 124                         break;
 125                 case XK_h:
 126                         ksym = XK_BackSpace;
 127                         break;
 128                 case XK_j:
 129                 case XK_m:
 130                         ksym = XK_Return;
 131                         break;
 132                 case XK_k:
 133                         text[cursor] = '\0';
 134                         break;
 135                 case XK_u:
 136                         memmove(text, text + cursor, sizeof text - cursor + 1);
 137                         cursor = 0;
 138                         break;
 139                 case XK_w:
 140                         if(cursor > 0) {
 141                                 i = cursor;
 142                                 while(i-- > 0 && text[i] == ' ');
 143                                 while(i-- > 0 && text[i] != ' ');
 144                                 memmove(text + i + 1, text + cursor, sizeof text - cursor + 1);
 145                                 cursor = i + 1;
 146                         }
 147                         break;
 148                 case XK_y:
 149                         {
 150                                 FILE *fp;
 151                                 char *s;
 152                                 if(!(fp = popen("sselp", "r")))
 153                                         eprint("cannot popen sselp\n");
 154                                 s = fgets(buf, sizeof buf, fp);
 155                                 pclose(fp);
 156                                 if(s == NULL)
 157                                         return;
 158                         }
 159                         num = strlen(buf);
 160                         if(num && buf[num-1] == '\n')
 161                                 buf[--num] = '\0';
 162                         break;
 163                 }
 164         }
 165         switch(ksym) {
 166         default:
 167                 num = MIN(num, sizeof text - cursor);
 168                 if(num && !iscntrl((int) buf[0])) {
 169                         memmove(text + cursor + num, text + cursor, sizeof text - cursor - num);
 170                         memcpy(text + cursor, buf, num);
 171                         cursor += num;
 172                 }
 173                 break;
 174         case XK_BackSpace:
 175                 if(cursor == 0)
 176                         return;
 177                 for(i = 1; cursor - i > 0 && !IS_UTF8_1ST_CHAR(text[cursor - i]); i++);
 178                 memmove(text + cursor - i, text + cursor, sizeof text - cursor + i);
 179                 cursor -= i;
 180                 break;
 181         case XK_Delete:
 182                 if(cursor == len)
 183                         return;
 184                 for(i = 1; cursor + i < len && !IS_UTF8_1ST_CHAR(text[cursor + i]); i++);
 185                 memmove(text + cursor, text + cursor + i, sizeof text - cursor);
 186                 break;
 187         case XK_End:
 188                 cursor = len;
 189                 break;
 190         case XK_Escape:
 191                 exit(EXIT_FAILURE);
 192         case XK_Home:
 193                 cursor = 0;
 194                 break;
 195         case XK_Left:
 196                 if(cursor == 0)
 197                         return;
 198                 while(cursor-- > 0 && !IS_UTF8_1ST_CHAR(text[cursor]));
 199                 break;
 200         case XK_Return:
 201                 fprintf(stdout, "%s", text);
 202                 fflush(stdout);
 203                 exit(EXIT_SUCCESS);
 204         case XK_Right:
 205                 if(cursor == len)
 206                         return;
 207                 while(cursor++ < len && !IS_UTF8_1ST_CHAR(text[cursor]));
 208                 break;
 209         }
 210         drawinput();
 211 }
 212
 213 void
 214 run(void) {
 215         XEvent ev;
 216
 217         /* main event loop */
 218         XSync(dpy, False);
 219         while(!XNextEvent(dpy, &ev))
 220                 switch(ev.type) {
 221                 case KeyPress:
 222                         kpress(&ev.xkey);
 223                         break;
 224                 case Expose:
 225                         if(ev.xexpose.count == 0)
 226                                 drawinput();
 227                         break;
 228                 case VisibilityNotify:
 229                         if(ev.xvisibility.state != VisibilityUnobscured)
 230                                 XRaiseWindow(dpy, win);
 231                         break;
 232                 }
 233         exit(EXIT_FAILURE);
 234 }
 235
 236 void
 237 setup(void) {
 238         int i, j, x, y;
 239 #if XINERAMA
 240         int n;
 241         XineramaScreenInfo *info = NULL;
 242 #endif
 243         XModifierKeymap *modmap;
 244         XSetWindowAttributes wa;
 245
 246         /* init modifier map */
 247         modmap = XGetModifierMapping(dpy);
 248         for(i = 0; i < 8; i++)
 249                 for(j = 0; j < modmap->max_keypermod; j++) {
 250                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 251                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 252                                 numlockmask = (1 << i);
 253                 }
 254         XFreeModifiermap(modmap);
 255
 256         dc.dpy = dpy;
 257         normcol[ColBG] = getcolor(&dc, normbgcolor);
 258         normcol[ColFG] = getcolor(&dc, normfgcolor);
 259         selcol[ColBG] = getcolor(&dc, selbgcolor);
 260         selcol[ColFG] = getcolor(&dc, selfgcolor);
 261         initfont(&dc, font);
 262
 263         /* input window */
 264         wa.override_redirect = True;
 265         wa.background_pixmap = ParentRelative;
 266         wa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
 267
 268         /* input window geometry */
 269         mh = dc.font.height + 2;
 270 #if XINERAMA
 271         if(XineramaIsActive(dpy) && (info = XineramaQueryScreens(dpy, &n))) {
 272                 i = 0;
 273                 if(n > 1) {
 274                         int di;
 275                         unsigned int dui;
 276                         Window dummy;
 277                         if(XQueryPointer(dpy, root, &dummy, &dummy, &x, &y, &di, &di, &dui))
 278                                 for(i = 0; i < n; i++)
 279                                         if(INRECT(x, y, info[i].x_org, info[i].y_org, info[i].width, info[i].height))
 280                                                 break;
 281                 }
 282                 x = info[i].x_org;
 283                 y = topbar ? info[i].y_org : info[i].y_org + info[i].height - mh;
 284                 mw = info[i].width;
 285                 XFree(info);
 286         }
 287         else
 288 #endif
 289         {
 290                 x = 0;
 291                 y = topbar ? 0 : DisplayHeight(dpy, screen) - mh;
 292                 mw = DisplayWidth(dpy, screen);
 293         }
 294
 295         win = XCreateWindow(dpy, root, x, y, mw, mh, 0,
 296                         DefaultDepth(dpy, screen), CopyFromParent,
 297                         DefaultVisual(dpy, screen),
 298                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 299
 300         setupdraw(&dc, win);
 301         if(prompt)
 302                 promptw = MIN(textw(&dc, prompt), mw / 5);
 303         cursor = strlen(text);
 304         XMapRaised(dpy, win);
 305 }
 306
 307 int
 308 main(int argc, char *argv[]) {
 309         unsigned int i;
 310
 311         /* command line args */
 312         progname = "dinput";
 313         for(i = 1; i < argc; i++)
 314                 if(!strcmp(argv[i], "-i"))
 315                         ;  /* ignore flag */
 316                 else if(!strcmp(argv[i], "-b"))
 317                         topbar = False;
 318                 else if(!strcmp(argv[i], "-l"))
 319                         i++;  /* ignore flag */
 320                 else if(!strcmp(argv[i], "-fn")) {
 321                         if(++i < argc) font = argv[i];
 322                 }
 323                 else if(!strcmp(argv[i], "-nb")) {
 324                         if(++i < argc) normbgcolor = argv[i];
 325                 }
 326                 else if(!strcmp(argv[i], "-nf")) {
 327                         if(++i < argc) normfgcolor = argv[i];
 328                 }
 329                 else if(!strcmp(argv[i], "-p")) {
 330                         if(++i < argc) prompt = argv[i];
 331                 }
 332                 else if(!strcmp(argv[i], "-sb")) {
 333                         if(++i < argc) selbgcolor = argv[i];
 334                 }
 335                 else if(!strcmp(argv[i], "-sf")) {
 336                         if(++i < argc) selfgcolor = argv[i];
 337                 }
 338                 else if(!strcmp(argv[i], "-v")) {
 339                         printf("dinput-"VERSION", © 2006-2010 dinput engineers, see LICENSE for details\n");
 340                         exit(EXIT_SUCCESS);
 341                 }
 342                 else if(!*text)
 343                         strncpy(text, argv[i], sizeof text);
 344                 else {
 345                         fputs("usage: dinput [-b] [-fn <font>] [-nb <color>] [-nf <color>]\n"
 346                               "              [-p <prompt>] [-sb <color>] [-sf <color>] [-v] [<text>]\n", stderr);
 347                         exit(EXIT_FAILURE);
 348                 }
 349         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
 350                 fprintf(stderr, "dinput: warning: no locale support\n");
 351         if(!(dpy = XOpenDisplay(NULL)))
 352                 eprint("cannot open display\n");
 353         if(atexit(&cleanup) != 0)
 354                 eprint("cannot register cleanup\n");
 355         screen = DefaultScreen(dpy);
 356         root = RootWindow(dpy, screen);
 357
 358         grabkeyboard();
 359         setup();
 360         run();
 361         return 0;
 362 }