convince/sway/commands/input/scroll_factor.c

#include <errno.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "sway/config.h"
#include "sway/commands.h"
#include "sway/input/input-manager.h"
#include "util.h"

struct cmd_results *input_cmd_scroll_factor(int argc, char **argv) {
	struct cmd_results *error = NULL;
	if ((error = checkarg(argc, "scroll_factor", EXPECTED_AT_LEAST, 1))) {
		return error;
	}
	struct input_config *ic = config->handler_context.input_config;
	if (!ic) {
		return cmd_results_new(CMD_FAILURE, "No input device defined.");
	}

	float scroll_factor = parse_float(argv[0]);
	if (isnan(scroll_factor)) {
		return cmd_results_new(CMD_INVALID,
			"Invalid scroll factor; expected float.");
	} else if (scroll_factor < 0) {
		return cmd_results_new(CMD_INVALID,
			"Scroll factor cannot be negative.");
	}
	ic->scroll_factor = scroll_factor;

	return cmd_results_new(CMD_SUCCESS, NULL);
}