2 #define I3__FILE__ "key_press.c"
4 * vim:ts=4:sw=4:expandtab
6 * i3 - an improved dynamic tiling window manager
7 * © 2009-2012 Michael Stapelberg and contributors (see also: LICENSE)
9 * key_press.c: key press handler
12 #include <sys/types.h>
18 static int current_nesting_level;
19 static bool success_key;
20 static bool command_failed;
22 /* XXX: I don’t want to touch too much of the nagbar code at once, but we
23 * should refactor this with src/cfgparse.y into a clean generic nagbar
24 * interface. It might come in handy in other situations within i3, too. */
25 static char *pager_script_path;
26 static pid_t nagbar_pid = -1;
29 * Handler which will be called when we get a SIGCHLD for the nagbar, meaning
30 * it exited (or could not be started, depending on the exit code).
33 static void nagbar_exited(EV_P_ ev_child *watcher, int revents) {
34 ev_child_stop(EV_A_ watcher);
36 if (unlink(pager_script_path) != 0)
37 warn("Could not delete temporary i3-nagbar script %s", pager_script_path);
39 if (!WIFEXITED(watcher->rstatus)) {
40 fprintf(stderr, "ERROR: i3-nagbar did not exit normally.\n");
44 int exitcode = WEXITSTATUS(watcher->rstatus);
45 printf("i3-nagbar process exited with status %d\n", exitcode);
47 fprintf(stderr, "ERROR: i3-nagbar could not be found. Is it correctly installed on your system?\n");
53 /* We need ev >= 4 for the following code. Since it is not *that* important (it
54 * only makes sure that there are no i3-nagbar instances left behind) we still
55 * support old systems with libev 3. */
56 #if EV_VERSION_MAJOR >= 4
58 * Cleanup handler. Will be called when i3 exits. Kills i3-nagbar with signal
59 * SIGKILL (9) to make sure there are no left-over i3-nagbar processes.
62 static void nagbar_cleanup(EV_P_ ev_cleanup *watcher, int revent) {
63 if (nagbar_pid != -1) {
64 LOG("Sending SIGKILL (%d) to i3-nagbar with PID %d\n", SIGKILL, nagbar_pid);
65 kill(nagbar_pid, SIGKILL);
71 * Writes the given command as a shell script to path.
72 * Returns true unless something went wrong.
75 static bool write_nagbar_script(const char *path, const char *command) {
76 int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IXUSR);
78 warn("Could not create temporary script to store the nagbar command");
81 write(fd, "#!/bin/sh\n", strlen("#!/bin/sh\n"));
82 write(fd, command, strlen(command));
88 * Starts an i3-nagbar process which alerts the user that his configuration
89 * file contains one or more errors. Also offers two buttons: One to launch an
90 * $EDITOR on the config file and another one to launch a $PAGER on the error
94 static void start_commanderror_nagbar(void) {
95 if (nagbar_pid != -1) {
96 DLOG("i3-nagbar for command error already running, not starting again.\n");
100 DLOG("Starting i3-nagbar due to command error\n");
102 /* We need to create a custom script containing our actual command
103 * since not every terminal emulator which is contained in
104 * i3-sensible-terminal supports -e with multiple arguments (and not
105 * all of them support -e with one quoted argument either).
107 * NB: The paths need to be unique, that is, don’t assume users close
108 * their nagbars at any point in time (and they still need to work).
110 pager_script_path = get_process_filename("nagbar-cfgerror-pager");
113 if (nagbar_pid == -1) {
114 warn("Could not fork()");
119 if (nagbar_pid == 0) {
121 sasprintf(&pager_command, "i3-sensible-pager \"%s\"\n", errorfilename);
122 if (!write_nagbar_script(pager_script_path, pager_command))
126 sasprintf(&pageraction, "i3-sensible-terminal -e \"%s\"", pager_script_path);
128 NULL, /* will be replaced by the executable path */
132 "The configured command for this shortcut could not be run successfully.",
138 exec_i3_utility("i3-nagbar", argv);
142 /* install a child watcher */
143 ev_child *child = smalloc(sizeof(ev_child));
144 ev_child_init(child, &nagbar_exited, nagbar_pid, 0);
145 ev_child_start(main_loop, child);
147 /* We need ev >= 4 for the following code. Since it is not *that* important (it
148 * only makes sure that there are no i3-nagbar instances left behind) we still
149 * support old systems with libev 3. */
150 #if EV_VERSION_MAJOR >= 4
151 /* install a cleanup watcher (will be called when i3 exits and i3-nagbar is
153 ev_cleanup *cleanup = smalloc(sizeof(ev_cleanup));
154 ev_cleanup_init(cleanup, nagbar_cleanup);
155 ev_cleanup_start(main_loop, cleanup);
160 * Kills the commanderror i3-nagbar process, if any.
162 * Called when reloading/restarting, since the user probably fixed his wrong
165 * If wait_for_it is set (restarting), this function will waitpid(), otherwise,
166 * ev is assumed to handle it (reloading).
169 void kill_commanderror_nagbar(bool wait_for_it) {
170 if (nagbar_pid == -1)
173 if (kill(nagbar_pid, SIGTERM) == -1)
174 warn("kill(configerror_nagbar) failed");
179 /* When restarting, we don’t enter the ev main loop anymore and after the
180 * exec(), our old pid is no longer watched. So, ev won’t handle SIGCHLD
181 * for us and we would end up with a <defunct> process. Therefore we
183 waitpid(nagbar_pid, NULL, 0);
186 static int json_boolean(void *ctx, int boolval) {
187 DLOG("Got bool: %d, success_key %d, nesting_level %d\n", boolval, success_key, current_nesting_level);
189 if (success_key && current_nesting_level == 1 && !boolval)
190 command_failed = true;
196 static int json_map_key(void *ctx, const unsigned char *stringval, size_t stringlen) {
198 static int json_map_key(void *ctx, const unsigned char *stringval, unsigned int stringlen) {
200 success_key = (stringlen >= strlen("success") &&
201 strncmp((const char*)stringval, "success", strlen("success")) == 0);
205 static int json_start_map(void *ctx) {
206 current_nesting_level++;
210 static int json_end_map(void *ctx) {
211 current_nesting_level--;
215 static yajl_callbacks command_error_callbacks = {
230 * There was a key press. We compare this key code with our bindings table and pass
231 * the bound action to parse_command().
234 void handle_key_press(xcb_key_press_event_t *event) {
236 last_timestamp = event->time;
238 DLOG("Keypress %d, state raw = %d\n", event->detail, event->state);
240 /* Remove the numlock bit, all other bits are modifiers we can bind to */
241 uint16_t state_filtered = event->state & ~(xcb_numlock_mask | XCB_MOD_MASK_LOCK);
242 DLOG("(removed numlock, state = %d)\n", state_filtered);
243 /* Only use the lower 8 bits of the state (modifier masks) so that mouse
244 * button masks are filtered out */
245 state_filtered &= 0xFF;
246 DLOG("(removed upper 8 bits, state = %d)\n", state_filtered);
248 if (xkb_current_group == XkbGroup2Index)
249 state_filtered |= BIND_MODE_SWITCH;
251 DLOG("(checked mode_switch, state %d)\n", state_filtered);
253 /* Find the binding */
254 Binding *bind = get_binding(state_filtered, event->detail);
256 /* No match? Then the user has Mode_switch enabled but does not have a
257 * specific keybinding. Fall back to the default keybindings (without
258 * Mode_switch). Makes it much more convenient for users of a hybrid
259 * layout (like us, ru). */
261 state_filtered &= ~(BIND_MODE_SWITCH);
262 DLOG("no match, new state_filtered = %d\n", state_filtered);
263 if ((bind = get_binding(state_filtered, event->detail)) == NULL) {
264 ELOG("Could not lookup key binding (modifiers %d, keycode %d)\n",
265 state_filtered, event->detail);
270 char *command_copy = sstrdup(bind->command);
271 struct CommandResult *command_output = parse_command(command_copy);
274 if (command_output->needs_tree_render)
277 /* We parse the JSON reply to figure out whether there was an error
278 * ("success" being false in on of the returned dictionaries). */
279 const unsigned char *reply;
282 yajl_handle handle = yajl_alloc(&command_error_callbacks, NULL, NULL);
285 yajl_parser_config parse_conf = { 0, 0 };
287 yajl_handle handle = yajl_alloc(&command_error_callbacks, &parse_conf, NULL, NULL);
289 yajl_gen_get_buf(command_output->json_gen, &reply, &length);
291 current_nesting_level = 0;
293 command_failed = false;
294 yajl_status state = yajl_parse(handle, reply, length);
295 if (state != yajl_status_ok) {
296 ELOG("Could not parse my own reply. That's weird. reply is %.*s\n", (int)length, reply);
299 start_commanderror_nagbar();
304 yajl_gen_free(command_output->json_gen);