hikari/src/binding_config.c

#include <hikari/binding_config.h>

#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>

#include <linux/input-event-codes.h>

#include <wlr/types/wlr_keyboard.h>

static bool
parse_modifier_mask(const char *str, uint8_t *result, const char **remaining)
{
	size_t len = strlen(str);
	uint8_t mask = 0;
	int pos;

	for (pos = 0; pos < len; pos++) {
		char c = str[pos];
		if (c == '-' || c == '+') {
			break;
		} else if (c == 'L') {
			mask |= WLR_MODIFIER_LOGO;
		} else if (c == 'S') {
			mask |= WLR_MODIFIER_SHIFT;
		} else if (c == 'A') {
			mask |= WLR_MODIFIER_ALT;
		} else if (c == 'C') {
			mask |= WLR_MODIFIER_CTRL;
		} else if (c == '5') {
			mask |= WLR_MODIFIER_MOD5;
		} else if (c == '0') {
			// do nothing
		} else {
			fprintf(stderr,
					"configuration error: unknown modifier \"%c\" in \"%s\"\n",
					c,
					str);
			return false;
		}
	}

	*result = mask;
	if (remaining != NULL) {
		*remaining = str + pos;
	}

	return true;
}

bool
hikari_binding_config_key_parse(
		struct hikari_binding_config_key *binding_key, const char *str)
{
	bool success = false;
	const char *remaining;

	if (!parse_modifier_mask(str, &binding_key->modifiers, &remaining)) {
		goto done;
	}

	if (*remaining == '-') {
		errno = 0;
		const long value = strtol(remaining + 1, NULL, 10);
		if (errno != 0 || value < 0 || value > UINT32_MAX) {
			fprintf(stderr,
					"configuration error: failed to parse keycode \"%s\"\n",
					remaining + 1);
			goto done;
		}

		binding_key->type = HIKARI_ACTION_BINDING_KEY_KEYCODE;
		binding_key->value.keycode = (uint32_t)value - 8;
	} else if (*remaining == '+') {
		xkb_keysym_t value =
				xkb_keysym_from_name(remaining + 1, XKB_KEYSYM_CASE_INSENSITIVE);
		if (value == XKB_KEY_NoSymbol) {
			fprintf(stderr,
					"configuration error: unknown key symbol \"%s\"\n",
					remaining + 1);
			goto done;
		}

		binding_key->type = HIKARI_ACTION_BINDING_KEY_KEYSYM;
		binding_key->value.keysym = value;
	} else {
		goto done;
	}

	success = true;

done:

	return success;
}

bool
hikari_binding_config_button_parse(
		struct hikari_binding_config_key *binding_key, const char *str)
{
	bool success = false;
	const char *remaining;

	if (!parse_modifier_mask(str, &binding_key->modifiers, &remaining)) {
		goto done;
	}

	if (*remaining == '+') {
		binding_key->type = HIKARI_ACTION_BINDING_KEY_KEYCODE;

		remaining++;

		if (!strcmp(remaining, "left")) {
			binding_key->value.keycode = BTN_LEFT;
		} else if (!strcmp(remaining, "right")) {
			binding_key->value.keycode = BTN_RIGHT;
		} else if (!strcmp(remaining, "middle")) {
			binding_key->value.keycode = BTN_MIDDLE;
		} else if (!strcmp(remaining, "side")) {
			binding_key->value.keycode = BTN_SIDE;
		} else if (!strcmp(remaining, "extra")) {
			binding_key->value.keycode = BTN_EXTRA;
		} else if (!strcmp(remaining, "forward")) {
			binding_key->value.keycode = BTN_FORWARD;
		} else if (!strcmp(remaining, "back")) {
			binding_key->value.keycode = BTN_BACK;
		} else if (!strcmp(remaining, "task")) {
			binding_key->value.keycode = BTN_TASK;
		} else {
			fprintf(stderr,
					"configuration error: unknown mouse button \"%s\"\n",
					remaining);
			goto done;
		}
	} else if (*remaining == '-') {
		binding_key->type = HIKARI_ACTION_BINDING_KEY_KEYCODE;

		remaining++;

		errno = 0;
		const long value = strtol(remaining, NULL, 10);
		if (errno != 0 || value < 0 || value > UINT32_MAX) {
			fprintf(stderr,
					"configuration error: failed to parse mouse binding \"%s\"\n",
					remaining);
			goto done;
		}
	} else {
		goto done;
	}

	success = true;

done:

	return success;
}