git.sur5r.net Git - i3/i3/blob - i3-input/main.c

   1 /*
   2  * vim:ts=8:expandtab
   3  *
   4  * i3 - an improved dynamic tiling window manager
   5  *
   6  * © 2009 Michael Stapelberg and contributors
   7  *
   8  * See file LICENSE for license information.
   9  *
  10  * i3-input/main.c: Utility which lets the user input commands and sends them
  11  * to i3.
  12  *
  13  */
  14 #include <ev.h>
  15 #include <stdio.h>
  16 #include <sys/types.h>
  17 #include <stdlib.h>
  18 #include <stdbool.h>
  19 #include <unistd.h>
  20 #include <string.h>
  21 #include <errno.h>
  22 #include <err.h>
  23 #include <stdint.h>
  24 #include <getopt.h>
  25 #include <limits.h>
  26
  27 #include <xcb/xcb.h>
  28 #include <xcb/xcb_aux.h>
  29 #include <xcb/xcb_event.h>
  30 #include <xcb/xcb_keysyms.h>
  31
  32 #include <X11/keysym.h>
  33
  34 #include "keysym2ucs.h"
  35
  36 #include "i3-input.h"
  37
  38 static char *socket_path;
  39 static int sockfd;
  40 static xcb_key_symbols_t *symbols;
  41 static int modeswitchmask;
  42 static int numlockmask;
  43 static bool modeswitch_active = false;
  44 static xcb_window_t win;
  45 static xcb_pixmap_t pixmap;
  46 static xcb_gcontext_t pixmap_gc;
  47 static char *glyphs_ucs[512];
  48 static char *glyphs_utf8[512];
  49 static int input_position;
  50 static int font_height;
  51 static char *command_prefix;
  52 static char *prompt;
  53 static int prompt_len;
  54 static int limit;
  55 xcb_window_t root;
  56
  57 /*
  58  * Try to get the socket path from X11 and return NULL if it doesn’t work.
  59  * As i3-msg is a short-running tool, we don’t bother with cleaning up the
  60  * connection and leave it up to the operating system on exit.
  61  *
  62  */
  63 static char *socket_path_from_x11() {
  64         xcb_connection_t *conn;
  65         int screen;
  66         if ((conn = xcb_connect(NULL, &screen)) == NULL ||
  67             xcb_connection_has_error(conn))
  68                 return NULL;
  69         xcb_screen_t *root_screen = xcb_aux_get_screen(conn, screen);
  70         xcb_window_t root = root_screen->root;
  71
  72         xcb_intern_atom_cookie_t atom_cookie;
  73         xcb_intern_atom_reply_t *atom_reply;
  74
  75         atom_cookie = xcb_intern_atom(conn, 0, strlen("I3_SOCKET_PATH"), "I3_SOCKET_PATH");
  76         atom_reply = xcb_intern_atom_reply(conn, atom_cookie, NULL);
  77         if (atom_reply == NULL)
  78                 return NULL;
  79
  80         xcb_get_property_cookie_t prop_cookie;
  81         xcb_get_property_reply_t *prop_reply;
  82         prop_cookie = xcb_get_property_unchecked(conn, false, root, atom_reply->atom,
  83                                                  XCB_GET_PROPERTY_TYPE_ANY, 0, PATH_MAX);
  84         prop_reply = xcb_get_property_reply(conn, prop_cookie, NULL);
  85         if (prop_reply == NULL || xcb_get_property_value_length(prop_reply) == 0)
  86                 return NULL;
  87         if (asprintf(&socket_path, "%.*s", xcb_get_property_value_length(prop_reply),
  88                      (char*)xcb_get_property_value(prop_reply)) == -1)
  89                 return NULL;
  90         return socket_path;
  91 }
  92
  93 /*
  94  * Concats the glyphs (either UCS-2 or UTF-8) to a single string, suitable for
  95  * rendering it (UCS-2) or sending it to i3 (UTF-8).
  96  *
  97  */
  98 static uint8_t *concat_strings(char **glyphs, int max) {
  99         uint8_t *output = calloc(max+1, 4);
 100         uint8_t *walk = output;
 101         for (int c = 0; c < max; c++) {
 102                 printf("at %c\n", glyphs[c][0]);
 103                 /* if the first byte is 0, this has to be UCS2 */
 104                 if (glyphs[c][0] == '\0') {
 105                         memcpy(walk, glyphs[c], 2);
 106                         walk += 2;
 107                 } else {
 108                         strcpy((char*)walk, glyphs[c]);
 109                         walk += strlen(glyphs[c]);
 110                 }
 111         }
 112         printf("output = %s\n", output);
 113         return output;
 114 }
 115
 116 /*
 117  * Handles expose events (redraws of the window) and rendering in general. Will
 118  * be called from the code with event == NULL or from X with event != NULL.
 119  *
 120  */
 121 static int handle_expose(void *data, xcb_connection_t *conn, xcb_expose_event_t *event) {
 122         printf("expose!\n");
 123
 124         /* re-draw the background */
 125         xcb_rectangle_t border = {0, 0, 500, font_height + 8}, inner = {2, 2, 496, font_height + 8 - 4};
 126         xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#FF0000"));
 127         xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &border);
 128         xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#000000"));
 129         xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &inner);
 130
 131         /* restore font color */
 132         xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#FFFFFF"));
 133         uint8_t *con = concat_strings(glyphs_ucs, input_position);
 134         char *full_text = (char*)con;
 135         if (prompt != NULL) {
 136                 full_text = malloc((prompt_len + input_position) * 2 + 1);
 137                 if (full_text == NULL)
 138                         err(EXIT_FAILURE, "malloc() failed\n");
 139                 memcpy(full_text, prompt, prompt_len * 2);
 140                 memcpy(full_text + (prompt_len * 2), con, input_position * 2);
 141         }
 142         xcb_image_text_16(conn, input_position + prompt_len, pixmap, pixmap_gc, 4 /* X */,
 143                           font_height + 2 /* Y = baseline of font */, (xcb_char2b_t*)full_text);
 144
 145         /* Copy the contents of the pixmap to the real window */
 146         xcb_copy_area(conn, pixmap, win, pixmap_gc, 0, 0, 0, 0, /* */ 500, font_height + 8);
 147         xcb_flush(conn);
 148         free(con);
 149         if (prompt != NULL)
 150                 free(full_text);
 151
 152         return 1;
 153 }
 154
 155 /*
 156  * Deactivates the Mode_switch bit upon release of the Mode_switch key.
 157  *
 158  */
 159 static int handle_key_release(void *ignored, xcb_connection_t *conn, xcb_key_release_event_t *event) {
 160         printf("releasing %d, state raw = %d\n", event->detail, event->state);
 161
 162         /* fix state */
 163         event->state &= ~numlockmask;
 164
 165         xcb_keysym_t sym = xcb_key_press_lookup_keysym(symbols, event, event->state);
 166         if (sym == XK_Mode_switch) {
 167                 printf("Mode switch disabled\n");
 168                 modeswitch_active = false;
 169         }
 170
 171         return 1;
 172 }
 173
 174 static void finish_input() {
 175         uint8_t *command = concat_strings(glyphs_utf8, input_position);
 176         char *full_command = (char*)command;
 177         /* prefix the command if a prefix was specified on commandline */
 178         if (command_prefix != NULL) {
 179                 if (asprintf(&full_command, "%s%s", command_prefix, command) == -1)
 180                         err(EXIT_FAILURE, "asprintf() failed\n");
 181         }
 182         printf("command = %s\n", full_command);
 183
 184         ipc_send_message(sockfd, strlen(full_command), 0, (uint8_t*)full_command);
 185
 186 #if 0
 187         free(command);
 188         return 1;
 189 #endif
 190         exit(0);
 191 }
 192
 193 /*
 194  * Handles keypresses by converting the keycodes to keysymbols, then the
 195  * keysymbols to UCS-2. If the conversion succeeded, the glyph is saved in the
 196  * internal buffers and displayed in the input window.
 197  *
 198  * Also handles backspace (deleting one character) and return (sending the
 199  * command to i3).
 200  *
 201  */
 202 static int handle_key_press(void *ignored, xcb_connection_t *conn, xcb_key_press_event_t *event) {
 203         printf("Keypress %d, state raw = %d\n", event->detail, event->state);
 204
 205         /* fix state */
 206         if (modeswitch_active)
 207                 event->state |= modeswitchmask;
 208
 209         /* Apparantly, after activating numlock once, the numlock modifier
 210          * stays turned on (use xev(1) to verify). So, to resolve useful
 211          * keysyms, we remove the numlock flag from the event state */
 212         event->state &= ~numlockmask;
 213
 214         xcb_keysym_t sym = xcb_key_press_lookup_keysym(symbols, event, event->state);
 215         if (sym == XK_Mode_switch) {
 216                 printf("Mode switch enabled\n");
 217                 modeswitch_active = true;
 218                 return 1;
 219         }
 220
 221         if (sym == XK_Return)
 222                 finish_input();
 223
 224         if (sym == XK_BackSpace) {
 225                 if (input_position == 0)
 226                         return 1;
 227
 228                 input_position--;
 229                 free(glyphs_ucs[input_position]);
 230                 free(glyphs_utf8[input_position]);
 231
 232                 handle_expose(NULL, conn, NULL);
 233                 return 1;
 234         }
 235         if (sym == XK_Escape) {
 236                 exit(0);
 237         }
 238
 239         /* TODO: handle all of these? */
 240         printf("is_keypad_key = %d\n", xcb_is_keypad_key(sym));
 241         printf("is_private_keypad_key = %d\n", xcb_is_private_keypad_key(sym));
 242         printf("xcb_is_cursor_key = %d\n", xcb_is_cursor_key(sym));
 243         printf("xcb_is_pf_key = %d\n", xcb_is_pf_key(sym));
 244         printf("xcb_is_function_key = %d\n", xcb_is_function_key(sym));
 245         printf("xcb_is_misc_function_key = %d\n", xcb_is_misc_function_key(sym));
 246         printf("xcb_is_modifier_key = %d\n", xcb_is_modifier_key(sym));
 247
 248         if (xcb_is_modifier_key(sym) || xcb_is_cursor_key(sym))
 249                 return 1;
 250
 251         printf("sym = %c (%d)\n", sym, sym);
 252
 253         /* convert the keysym to UCS */
 254         uint16_t ucs = keysym2ucs(sym);
 255         if ((int16_t)ucs == -1) {
 256                 fprintf(stderr, "Keysym could not be converted to UCS, skipping\n");
 257                 return 1;
 258         }
 259
 260         /* store the UCS into a string */
 261         uint8_t inp[3] = {(ucs & 0xFF00) >> 8, (ucs & 0xFF), 0};
 262
 263         printf("inp[0] = %02x, inp[1] = %02x, inp[2] = %02x\n", inp[0], inp[1], inp[2]);
 264         /* convert it to UTF-8 */
 265         char *out = convert_ucs_to_utf8((char*)inp);
 266         printf("converted to %s\n", out);
 267
 268         glyphs_ucs[input_position] = malloc(3 * sizeof(uint8_t));
 269         if (glyphs_ucs[input_position] == NULL)
 270                 err(EXIT_FAILURE, "malloc() failed\n");
 271         memcpy(glyphs_ucs[input_position], inp, 3);
 272         glyphs_utf8[input_position] = strdup(out);
 273         input_position++;
 274
 275         if (input_position == limit)
 276                 finish_input();
 277
 278         handle_expose(NULL, conn, NULL);
 279         return 1;
 280 }
 281
 282 int main(int argc, char *argv[]) {
 283         socket_path = getenv("I3SOCK");
 284         char *pattern = "-misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1";
 285         int o, option_index = 0;
 286
 287         static struct option long_options[] = {
 288                 {"socket", required_argument, 0, 's'},
 289                 {"version", no_argument, 0, 'v'},
 290                 {"limit", required_argument, 0, 'l'},
 291                 {"prompt", required_argument, 0, 'P'},
 292                 {"prefix", required_argument, 0, 'p'},
 293                 {"font", required_argument, 0, 'f'},
 294                 {"help", no_argument, 0, 'h'},
 295                 {0, 0, 0, 0}
 296         };
 297
 298         char *options_string = "s:p:P:f:l:vh";
 299
 300         while ((o = getopt_long(argc, argv, options_string, long_options, &option_index)) != -1) {
 301                 switch (o) {
 302                         case 's':
 303                                 FREE(socket_path);
 304                                 socket_path = strdup(optarg);
 305                                 break;
 306                         case 'v':
 307                                 printf("i3-input " I3_VERSION);
 308                                 return 0;
 309                         case 'p':
 310                                 FREE(command_prefix);
 311                                 command_prefix = strdup(optarg);
 312                                 break;
 313                         case 'l':
 314                                 limit = atoi(optarg);
 315                                 break;
 316                         case 'P':
 317                                 FREE(prompt);
 318                                 prompt = strdup(optarg);
 319                                 break;
 320                         case 'f':
 321                                 FREE(pattern);
 322                                 pattern = strdup(optarg);
 323                                 break;
 324                         case 'h':
 325                                 printf("i3-input " I3_VERSION);
 326                                 printf("i3-input [-s <socket>] [-p <prefix>] [-l <limit>] [-P <prompt>] [-f <font>] [-v]\n");
 327                                 return 0;
 328                 }
 329         }
 330
 331         if (socket_path == NULL)
 332                 socket_path = socket_path_from_x11();
 333
 334         if (socket_path == NULL)
 335                 socket_path = "/tmp/i3-ipc.sock";
 336
 337         sockfd = connect_ipc(socket_path);
 338
 339         if (prompt != NULL)
 340                 prompt = convert_utf8_to_ucs2(prompt, &prompt_len);
 341
 342         int screens;
 343         xcb_connection_t *conn = xcb_connect(NULL, &screens);
 344         if (xcb_connection_has_error(conn))
 345                 die("Cannot open display\n");
 346
 347         xcb_screen_t *root_screen = xcb_aux_get_screen(conn, screens);
 348         root = root_screen->root;
 349
 350         modeswitchmask = get_mod_mask(conn, XK_Mode_switch);
 351         numlockmask = get_mod_mask(conn, XK_Num_Lock);
 352         symbols = xcb_key_symbols_alloc(conn);
 353
 354         uint32_t font_id = get_font_id(conn, pattern, &font_height);
 355
 356         /* Open an input window */
 357         win = open_input_window(conn, 500, font_height + 8);
 358
 359         /* Create pixmap */
 360         pixmap = xcb_generate_id(conn);
 361         pixmap_gc = xcb_generate_id(conn);
 362         xcb_create_pixmap(conn, root_screen->root_depth, pixmap, win, 500, font_height + 8);
 363         xcb_create_gc(conn, pixmap_gc, pixmap, 0, 0);
 364
 365         /* Set input focus (we have override_redirect=1, so the wm will not do
 366          * this for us) */
 367         xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, win, XCB_CURRENT_TIME);
 368
 369         /* Create graphics context */
 370         xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FONT, font_id);
 371
 372         /* Grab the keyboard to get all input */
 373         xcb_flush(conn);
 374
 375         /* Try (repeatedly, if necessary) to grab the keyboard. We might not
 376          * get the keyboard at the first attempt because of the keybinding
 377          * still being active when started via a wm’s keybinding. */
 378         xcb_grab_keyboard_cookie_t cookie;
 379         xcb_grab_keyboard_reply_t *reply = NULL;
 380
 381         int count = 0;
 382         while ((reply == NULL || reply->status != XCB_GRAB_STATUS_SUCCESS) && (count++ < 500)) {
 383                 cookie = xcb_grab_keyboard(conn, false, win, XCB_CURRENT_TIME, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC);
 384                 reply = xcb_grab_keyboard_reply(conn, cookie, NULL);
 385                 usleep(1000);
 386         }
 387
 388         if (reply->status != XCB_GRAB_STATUS_SUCCESS) {
 389                 fprintf(stderr, "Could not grab keyboard, status = %d\n", reply->status);
 390                 exit(-1);
 391         }
 392
 393         xcb_flush(conn);
 394
 395         xcb_generic_event_t *event;
 396         while ((event = xcb_wait_for_event(conn)) != NULL) {
 397                 if (event->response_type == 0) {
 398                         fprintf(stderr, "X11 Error received! sequence %x\n", event->sequence);
 399                         continue;
 400                 }
 401
 402                 /* Strip off the highest bit (set if the event is generated) */
 403                 int type = (event->response_type & 0x7F);
 404
 405                 switch (type) {
 406                         case XCB_KEY_PRESS:
 407                                 handle_key_press(NULL, conn, (xcb_key_press_event_t*)event);
 408                                 break;
 409
 410                         case XCB_KEY_RELEASE:
 411                                 handle_key_release(NULL, conn, (xcb_key_release_event_t*)event);
 412                                 break;
 413
 414                         case XCB_EXPOSE:
 415                                 handle_expose(NULL, conn, (xcb_expose_event_t*)event);
 416                                 break;
 417                 }
 418
 419                 free(event);
 420         }
 421
 422         return 0;
 423 }