How to set a global variant or write a public function in Nextflow that can be used in all module files?

[lishengting]

I have a variant 'project' and a function get_prj() in a file:
prj.nf

project = ""
if (!params.project.equalsIgnoreCase("none")) {
	project = "-P " + params.project
}

def get_prj() {
	if (!params.project.equalsIgnoreCase("none")) {
		return "-P " + params.project
	}else{
		return "";
	}
}

I want to use them in another 20 module files.
How could I do this?

I tried
include {get_prj} from "./prj"

But it doesn't work, always says

Unknown process directive: get_prj

or

No such variable: project

Thanks!

[mribeirodantas]

You should use include to include Nextflow processes, not regular functions. For what you're trying to do, check the following link to learn more about the lib folder:https://training.nextflow.io/advanced/structure/#lib.