3 * vim:ts=4:sw=4:expandtab
5 * i3 - an improved dynamic tiling window manager
6 * © 2009-2012 Michael Stapelberg and contributors (see also: LICENSE)
8 * key_press.c: key press handler
11 #include <sys/types.h>
17 static int current_nesting_level;
18 static bool success_key;
19 static bool command_failed;
21 /* XXX: I don’t want to touch too much of the nagbar code at once, but we
22 * should refactor this with src/cfgparse.y into a clean generic nagbar
23 * interface. It might come in handy in other situations within i3, too. */
24 static char *pager_script_path;
25 static pid_t nagbar_pid = -1;
28 * Handler which will be called when we get a SIGCHLD for the nagbar, meaning
29 * it exited (or could not be started, depending on the exit code).
32 static void nagbar_exited(EV_P_ ev_child *watcher, int revents) {
33 ev_child_stop(EV_A_ watcher);
35 if (unlink(pager_script_path) != 0)
36 warn("Could not delete temporary i3-nagbar script %s", pager_script_path);
38 if (!WIFEXITED(watcher->rstatus)) {
39 fprintf(stderr, "ERROR: i3-nagbar did not exit normally.\n");
43 int exitcode = WEXITSTATUS(watcher->rstatus);
44 printf("i3-nagbar process exited with status %d\n", exitcode);
46 fprintf(stderr, "ERROR: i3-nagbar could not be found. Is it correctly installed on your system?\n");
52 /* We need ev >= 4 for the following code. Since it is not *that* important (it
53 * only makes sure that there are no i3-nagbar instances left behind) we still
54 * support old systems with libev 3. */
55 #if EV_VERSION_MAJOR >= 4
57 * Cleanup handler. Will be called when i3 exits. Kills i3-nagbar with signal
58 * SIGKILL (9) to make sure there are no left-over i3-nagbar processes.
61 static void nagbar_cleanup(EV_P_ ev_cleanup *watcher, int revent) {
62 if (nagbar_pid != -1) {
63 LOG("Sending SIGKILL (%d) to i3-nagbar with PID %d\n", SIGKILL, nagbar_pid);
64 kill(nagbar_pid, SIGKILL);
70 * Writes the given command as a shell script to path.
71 * Returns true unless something went wrong.
74 static bool write_nagbar_script(const char *path, const char *command) {
75 int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IXUSR);
77 warn("Could not create temporary script to store the nagbar command");
80 write(fd, "#!/bin/sh\n", strlen("#!/bin/sh\n"));
81 write(fd, command, strlen(command));
87 * Starts an i3-nagbar process which alerts the user that his configuration
88 * file contains one or more errors. Also offers two buttons: One to launch an
89 * $EDITOR on the config file and another one to launch a $PAGER on the error
93 static void start_commanderror_nagbar(void) {
94 if (nagbar_pid != -1) {
95 DLOG("i3-nagbar for command error already running, not starting again.\n");
99 DLOG("Starting i3-nagbar due to command error\n");
101 /* We need to create a custom script containing our actual command
102 * since not every terminal emulator which is contained in
103 * i3-sensible-terminal supports -e with multiple arguments (and not
104 * all of them support -e with one quoted argument either).
106 * NB: The paths need to be unique, that is, don’t assume users close
107 * their nagbars at any point in time (and they still need to work).
109 pager_script_path = get_process_filename("nagbar-cfgerror-pager");
112 if (nagbar_pid == -1) {
113 warn("Could not fork()");
118 if (nagbar_pid == 0) {
120 sasprintf(&pager_command, "i3-sensible-pager \"%s\"\n", errorfilename);
121 if (!write_nagbar_script(pager_script_path, pager_command))
125 sasprintf(&pageraction, "i3-sensible-terminal -e \"%s\"", pager_script_path);
127 NULL, /* will be replaced by the executable path */
131 "The configured command for this shortcut could not be run successfully.",
137 exec_i3_utility("i3-nagbar", argv);
141 /* install a child watcher */
142 ev_child *child = smalloc(sizeof(ev_child));
143 ev_child_init(child, &nagbar_exited, nagbar_pid, 0);
144 ev_child_start(main_loop, child);
146 /* We need ev >= 4 for the following code. Since it is not *that* important (it
147 * only makes sure that there are no i3-nagbar instances left behind) we still
148 * support old systems with libev 3. */
149 #if EV_VERSION_MAJOR >= 4
150 /* install a cleanup watcher (will be called when i3 exits and i3-nagbar is
152 ev_cleanup *cleanup = smalloc(sizeof(ev_cleanup));
153 ev_cleanup_init(cleanup, nagbar_cleanup);
154 ev_cleanup_start(main_loop, cleanup);
159 * Kills the commanderror i3-nagbar process, if any.
161 * Called when reloading/restarting, since the user probably fixed his wrong
164 * If wait_for_it is set (restarting), this function will waitpid(), otherwise,
165 * ev is assumed to handle it (reloading).
168 void kill_commanderror_nagbar(bool wait_for_it) {
169 if (nagbar_pid == -1)
172 if (kill(nagbar_pid, SIGTERM) == -1)
173 warn("kill(configerror_nagbar) failed");
178 /* When restarting, we don’t enter the ev main loop anymore and after the
179 * exec(), our old pid is no longer watched. So, ev won’t handle SIGCHLD
180 * for us and we would end up with a <defunct> process. Therefore we
182 waitpid(nagbar_pid, NULL, 0);
185 static int json_boolean(void *ctx, int boolval) {
186 DLOG("Got bool: %d, success_key %d, nesting_level %d\n", boolval, success_key, current_nesting_level);
188 if (success_key && current_nesting_level == 1 && !boolval)
189 command_failed = true;
195 static int json_map_key(void *ctx, const unsigned char *stringval, size_t stringlen) {
197 static int json_map_key(void *ctx, const unsigned char *stringval, unsigned int stringlen) {
199 success_key = (stringlen >= strlen("success") &&
200 strncmp((const char*)stringval, "success", strlen("success")) == 0);
204 static int json_start_map(void *ctx) {
205 current_nesting_level++;
209 static int json_end_map(void *ctx) {
210 current_nesting_level--;
214 static yajl_callbacks command_error_callbacks = {
229 * There was a key press. We compare this key code with our bindings table and pass
230 * the bound action to parse_command().
233 void handle_key_press(xcb_key_press_event_t *event) {
235 last_timestamp = event->time;
237 DLOG("Keypress %d, state raw = %d\n", event->detail, event->state);
239 /* Remove the numlock bit, all other bits are modifiers we can bind to */
240 uint16_t state_filtered = event->state & ~(xcb_numlock_mask | XCB_MOD_MASK_LOCK);
241 DLOG("(removed numlock, state = %d)\n", state_filtered);
242 /* Only use the lower 8 bits of the state (modifier masks) so that mouse
243 * button masks are filtered out */
244 state_filtered &= 0xFF;
245 DLOG("(removed upper 8 bits, state = %d)\n", state_filtered);
247 if (xkb_current_group == XkbGroup2Index)
248 state_filtered |= BIND_MODE_SWITCH;
250 DLOG("(checked mode_switch, state %d)\n", state_filtered);
252 /* Find the binding */
253 Binding *bind = get_binding(state_filtered, event->detail);
255 /* No match? Then the user has Mode_switch enabled but does not have a
256 * specific keybinding. Fall back to the default keybindings (without
257 * Mode_switch). Makes it much more convenient for users of a hybrid
258 * layout (like us, ru). */
260 state_filtered &= ~(BIND_MODE_SWITCH);
261 DLOG("no match, new state_filtered = %d\n", state_filtered);
262 if ((bind = get_binding(state_filtered, event->detail)) == NULL) {
263 ELOG("Could not lookup key binding (modifiers %d, keycode %d)\n",
264 state_filtered, event->detail);
269 char *command_copy = sstrdup(bind->command);
270 struct CommandResult *command_output = parse_command(command_copy);
273 if (command_output->needs_tree_render)
276 /* We parse the JSON reply to figure out whether there was an error
277 * ("success" being false in on of the returned dictionaries). */
278 const unsigned char *reply;
281 yajl_handle handle = yajl_alloc(&command_error_callbacks, NULL, NULL);
284 yajl_parser_config parse_conf = { 0, 0 };
286 yajl_handle handle = yajl_alloc(&command_error_callbacks, &parse_conf, NULL, NULL);
288 yajl_gen_get_buf(command_output->json_gen, &reply, &length);
290 current_nesting_level = 0;
292 command_failed = false;
293 yajl_status state = yajl_parse(handle, reply, length);
294 if (state != yajl_status_ok) {
295 ELOG("Could not parse my own reply. That's weird. reply is %.*s\n", (int)length, reply);
298 start_commanderror_nagbar();
303 yajl_gen_free(command_output->json_gen);