First commit

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 164 insertions, 0 deletions

diff --git a/xkbdbind.c b/xkbdbind.c
new file mode 100644
index 0000000..6df0520
--- /dev/null
+++ b/xkbdbind.c
@@ -0,0 +1,164 @@
+/* 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) {
+		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;
+			continue;
+		}
+		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;
+		}
+	}
+
+	perror(argv0);
+	return 1;
+}