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/* See LICENSE file for copyright and license details. */
#include <sys/wait.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <xcb/xcb.h>
#include <xcb/xcb_keysyms.h>
#include <xcb/xproto.h>
#include <X11/keysym.h>
#define eprint(STR) (fprintf(stderr, "%s: %s\n", argv0, (STR)), exit(1))
#define _MOD_CAPS XCB_MOD_MASK_LOCK
#define _MOD_NUM XCB_MOD_MASK_2
#define MOD_SHIFT XCB_MOD_MASK_SHIFT
#define MOD_CTRL XCB_MOD_MASK_CONTROL
#define MOD_ALT XCB_MOD_MASK_1
#define MOD_HYPER XCB_MOD_MASK_3
#define MOD_SUPER XCB_MOD_MASK_4
#define MOD_ALTGR XCB_MOD_MASK_5
#define CMD(...) (const char *[]){__VA_ARGS__, NULL}
struct hotkey {
uint32_t key; /* xcb_keysym_t is uint32_t and xcb_keycode_t is uint8_t */
uint16_t modifiers;
pid_t repeatable;
const char **command;
};
#include "config.h"
static char *argv0;
static xcb_connection_t *xconn;
static pid_t
spawn(const char **command)
{
pid_t r;
switch ((r = fork())) {
case -1:
perror(argv0);
break;
case 0:
execvp(*command, (char *const *)command);
fprintf(stderr, "%s: %s: %s\n", argv0, *command, strerror(errno));
exit(1);
break;
default:
break;
}
return r;
}
static void
sigchld(int signo)
{
pid_t r;
size_t i;
r = wait(NULL);
if (r > 0)
for (i = 0; i < sizeof(hotkeys) / sizeof(*hotkeys); i++)
if (hotkeys[i].repeatable == r)
hotkeys[i].repeatable = -1;
(void) signo;
}
static void
setup(void)
{
#define GRAB_KEY(KEY, MODS) (xcb_grab_key(xconn, 1, xscreen->root, (MODS), (KEY), XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC))
const xcb_setup_t *xsetup;
xcb_screen_iterator_t xscreen_iter;
xcb_screen_t *xscreen;
int default_xscreen;
xcb_key_symbols_t *keysyms;
size_t i;
if (signal(SIGCHLD, sigchld) == SIG_ERR)
eprint("failed to setup handler for SIGCHLD");
xconn = xcb_connect(NULL, &default_xscreen);
if (!xconn || xcb_connection_has_error(xconn))
eprint("failed to connect to display");
if ((xsetup = xcb_get_setup(xconn)) == NULL)
eprint("failed to get list of X screens");
xscreen_iter = xcb_setup_roots_iterator(xsetup);
if (xscreen_iter.rem <= default_xscreen)
eprint("could not find the X screen");
for (; default_xscreen && xscreen_iter.rem; default_xscreen--)
xcb_screen_next(&xscreen_iter);
if (!xscreen_iter.rem || !(xscreen = xscreen_iter.data))
eprint("could not find the X screen");
keysyms = xcb_key_symbols_alloc(xconn);
for (i = 0; i < sizeof(hotkeys) / sizeof(*hotkeys); i++) {
hotkeys[i].key = *xcb_key_symbols_get_keycode(keysyms, hotkeys[i].key);
GRAB_KEY(hotkeys[i].key, hotkeys[i].modifiers);
GRAB_KEY(hotkeys[i].key, hotkeys[i].modifiers | _MOD_CAPS);
GRAB_KEY(hotkeys[i].key, hotkeys[i].modifiers | _MOD_NUM);
GRAB_KEY(hotkeys[i].key, hotkeys[i].modifiers | _MOD_CAPS | _MOD_NUM);
if (hotkeys[i].repeatable)
hotkeys[i].repeatable = -1;
}
xcb_key_symbols_free(keysyms);
xcb_flush(xconn);
}
int
main(int argc, char *argv[])
{
xcb_generic_event_t *e, *next_e = NULL;
xcb_keycode_t key;
uint16_t mods;
int suppress = 0;
size_t i;
argv0 = argv[0];
if (argc > 1 && !strcmp(argv[1], "--"))
argc--;
if (argc > 1) {
fprintf(stderr, "usage: %s\n", argv0);
return 1;
}
setup();
while ((e = next_e ? next_e : xcb_wait_for_event(xconn))) {
next_e = xcb_poll_for_event(xconn);
if (suppress > 0) {
suppress = 0;
goto next;
}
switch (e->response_type & ~0x80) {
case XCB_KEY_RELEASE:
if (suppress >= 0 && next_e && (next_e->response_type & ~0x80) == XCB_KEY_PRESS &&
((xcb_key_press_event_t *)next_e)->time == ((xcb_key_press_event_t *)e)->time)
suppress = 1;
break;
case XCB_KEY_PRESS:
key = ((xcb_key_press_event_t *)e)->detail;
mods = ((xcb_key_press_event_t *)e)->state & ~(_MOD_CAPS | _MOD_NUM);
for (i = 0; i < sizeof(hotkeys) / sizeof(*hotkeys); i++) {
if (key == hotkeys[i].key && mods == hotkeys[i].modifiers) {
suppress = hotkeys[i].repeatable ? -1 : 0;
if (hotkeys[i].repeatable == -1)
hotkeys[i].repeatable = spawn(hotkeys[i].command);
else if (!hotkeys[i].repeatable)
spawn(hotkeys[i].command);
break;
}
}
break;
}
next:
free(e);
}
perror(argv0);
return 1;
}
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