Apply_output_config.c refactor v1

void apply_output_config(struct output_config *oc, struct sway_output *output) {
	struct wlr_output *wlr_output = output->wlr_output;


if (!oc) {
	if (!output->enabled) {
		if (oc->dpms_state != DPMS_OFF) {
			wlr_output_enable(wlr_output, true);
		}
		output_enable(output, oc);
		return;
	}
}

if (oc) {
	switch (oc->dpms_state) {
		case DPMS_ON:
			wlr_log(WLR_DEBUG, "Turning on screen");
			wlr_output_enable(wlr_output, true);
			break;
		case DPMS_OFF:
			wlr_log(WLR_DEBUG, "Turning off screen");
			wlr_output_enable(wlr_output, false);
			break;
		case DPMS_IGNORE:
			break;
	}

	if (oc->enabled == 0) {
		if (output->enabled) {
			if (output->bg_pid != 0) {
				terminate_swaybg(output->bg_pid);
				output->bg_pid = 0;
			}
			output_disable(output);
			wlr_output_layout_remove(root->output_layout, wlr_output);
		}
		wlr_output_enable(wlr_output, false);
		return;
	} 

	if (oc->width > 0 && oc->height > 0) {
		wlr_log(WLR_DEBUG, "Set %s mode to %dx%d (%f GHz)", oc->name, oc->width,
			oc->height, oc->refresh_rate);
		set_mode(wlr_output, oc->width, oc->height, oc->refresh_rate);
		//TODO: Fix modesetting!
	} else if (wlr_output->current_mode == NULL && !wl_list_empty(&wlr_output->modes)) {
		struct wlr_output_mode *mode =
			wl_container_of(wlr_output->modes.prev, mode, link);
		wlr_output_set_mode(wlr_output, mode);
	}

	if (oc->scale > 0) {
		wlr_log(WLR_DEBUG, "Set %s scale to %f", oc->name, oc->scale);
		wlr_output_set_scale(wlr_output, oc->scale);
	}
	if (oc->transform >= 0) {
		wlr_log(WLR_DEBUG, "Set %s transform to %d", oc->name, oc->transform);
		wlr_output_set_transform(wlr_output, oc->transform);
	}
	// Find position for it
	if (oc->x != -1 || oc->y != -1) {
		wlr_log(WLR_DEBUG, "Set %s position to %d, %d", oc->name, oc->x, oc->y);
		wlr_output_layout_add(root->output_layout, wlr_output, oc->x, oc->y);
	} else {
		wlr_output_layout_add_auto(root->output_layout, wlr_output);
	}

	int output_i;
	for (output_i = 0; output_i < root->outputs->length; ++output_i) {
		if (root->outputs->items[output_i] == output) {
			break;
		}
	}

	if (output->bg_pid != 0) {
		terminate_swaybg(output->bg_pid);
	}
	
	if (oc->background && config->swaybg_command) {
		wlr_log(WLR_DEBUG, "Setting background for output %d to %s",
				output_i, oc->background);

		size_t len = snprintf(NULL, 0, "%s %d \"%s\" %s %s",
				config->swaybg_command, output_i, oc->background,
				oc->background_option,
				oc->background_fallback ? oc->background_fallback : "");
		char *command = malloc(len + 1);
		if (!command) {
			wlr_log(WLR_DEBUG, "Unable to allocate swaybg command");
			return;
		}
		snprintf(command, len + 1, "%s %d \"%s\" %s %s",
				config->swaybg_command, output_i, oc->background,
				oc->background_option,
				oc->background_fallback ? oc->background_fallback : "");
		wlr_log(WLR_DEBUG, "-> %s", command);

		char *const cmd[] = { "sh", "-c", command, NULL };
		output->bg_pid = fork();
		if (output->bg_pid == 0) {
			execvp(cmd[0], cmd);
		} else {
			free(command);
		}
	}
}