i3/src/key_press.c

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#undef I3__FILE__
#define I3__FILE__ "key_press.c"
/*
* vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
* © 2009-2013 Michael Stapelberg and contributors (see also: LICENSE)
*
* key_press.c: key press handler
*
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include "all.h"
static int current_nesting_level;
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static bool parse_error_key;
static bool command_failed;
pid_t command_error_nagbar_pid = -1;
static int json_boolean(void *ctx, int boolval) {
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DLOG("Got bool: %d, parse_error_key %d, nesting_level %d\n", boolval, parse_error_key, current_nesting_level);
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if (parse_error_key && current_nesting_level == 1 && boolval)
command_failed = true;
return 1;
}
#if YAJL_MAJOR >= 2
static int json_map_key(void *ctx, const unsigned char *stringval, size_t stringlen) {
#else
static int json_map_key(void *ctx, const unsigned char *stringval, unsigned int stringlen) {
#endif
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parse_error_key = (stringlen >= strlen("parse_error") &&
strncmp((const char*)stringval, "parse_error", strlen("parse_error")) == 0);
return 1;
}
static int json_start_map(void *ctx) {
current_nesting_level++;
return 1;
}
static int json_end_map(void *ctx) {
current_nesting_level--;
return 1;
}
static yajl_callbacks command_error_callbacks = {
NULL,
&json_boolean,
NULL,
NULL,
NULL,
NULL,
&json_start_map,
&json_map_key,
&json_end_map,
NULL,
NULL
};
/*
* There was a KeyPress or KeyRelease (both events have the same fields). We
* compare this key code with our bindings table and pass the bound action to
* parse_command().
*
*/
void handle_key_press(xcb_key_press_event_t *event) {
bool key_release = (event->response_type == XCB_KEY_RELEASE);
last_timestamp = event->time;
DLOG("%s %d, state raw = %d\n", (key_release ? "KeyRelease" : "KeyPress"), event->detail, event->state);
/* Remove the numlock bit, all other bits are modifiers we can bind to */
uint16_t state_filtered = event->state & ~(xcb_numlock_mask | XCB_MOD_MASK_LOCK);
DLOG("(removed numlock, state = %d)\n", state_filtered);
/* Only use the lower 8 bits of the state (modifier masks) so that mouse
* button masks are filtered out */
state_filtered &= 0xFF;
DLOG("(removed upper 8 bits, state = %d)\n", state_filtered);
if (xkb_current_group == XkbGroup2Index)
state_filtered |= BIND_MODE_SWITCH;
DLOG("(checked mode_switch, state %d)\n", state_filtered);
/* Find the binding */
Binding *bind = get_binding(state_filtered, key_release, event->detail);
/* No match? Then the user has Mode_switch enabled but does not have a
* specific keybinding. Fall back to the default keybindings (without
* Mode_switch). Makes it much more convenient for users of a hybrid
* layout (like us, ru). */
if (bind == NULL) {
state_filtered &= ~(BIND_MODE_SWITCH);
DLOG("no match, new state_filtered = %d\n", state_filtered);
if ((bind = get_binding(state_filtered, key_release, event->detail)) == NULL) {
/* This is not a real error since we can have release and
* non-release keybindings. On a KeyPress event for which there is
* only a !release-binding, but no release-binding, the
* corresponding KeyRelease event will trigger this. No problem,
* though. */
DLOG("Could not lookup key binding (modifiers %d, keycode %d)\n",
state_filtered, event->detail);
return;
}
}
char *command_copy = sstrdup(bind->command);
struct CommandResult *command_output = parse_command(command_copy);
free(command_copy);
if (command_output->needs_tree_render)
tree_render();
/* We parse the JSON reply to figure out whether there was an error
* ("success" being false in on of the returned dictionaries). */
const unsigned char *reply;
#if YAJL_MAJOR >= 2
size_t length;
yajl_handle handle = yajl_alloc(&command_error_callbacks, NULL, NULL);
#else
unsigned int length;
yajl_parser_config parse_conf = { 0, 0 };
yajl_handle handle = yajl_alloc(&command_error_callbacks, &parse_conf, NULL, NULL);
#endif
yajl_gen_get_buf(command_output->json_gen, &reply, &length);
current_nesting_level = 0;
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parse_error_key = false;
command_failed = false;
yajl_status state = yajl_parse(handle, reply, length);
if (state != yajl_status_ok) {
ELOG("Could not parse my own reply. That's weird. reply is %.*s\n", (int)length, reply);
} else {
if (command_failed) {
char *pageraction;
sasprintf(&pageraction, "i3-sensible-pager \"%s\"\n", errorfilename);
char *argv[] = {
NULL, /* will be replaced by the executable path */
"-f",
config.font.pattern,
"-t",
"error",
"-m",
"The configured command for this shortcut could not be run successfully.",
"-b",
"show errors",
pageraction,
NULL
};
start_nagbar(&command_error_nagbar_pid, argv);
free(pageraction);
}
}
yajl_free(handle);
yajl_gen_free(command_output->json_gen);
}