Custom Module to Re-use Code

JeffreyEsser · September 8, 2022, 3:30pm

Has anyone built a custom starlark module? Or could point me to some documentation as to how to do it?

I would like to re-use some code between different apps. I made a .star file with the variables and functions I want to re-use. Then tried to load it into another .star file with this command:

load(“test_module.star”, “testmod”)

But I keep getting the following error – saying Invalid Module:

error loading applet: failed to load applet: starlark.ExecFile: cannot load test_module.star: invalid module: test_module.star

Are there certain requirements that need to be met for a .star file to be loaded through the load command?

drudge · September 8, 2022, 5:02pm

Hi @JeffreyEsser!

It is not currently possible to load arbitrary Starlark code from a file. The load command has hardcoded list of acceptable filenames:

github.com

tidbyt/pixlet/blob/main/runtime/applet.go#L283

      
        
            			"in %s at %s: %s",
            			callable.Name(),
            			callable.Position().String(),
            			err,
            		)
            	}
            
            
	return resultVal, nil
            }
            
            
func (a *Applet) loadModule(thread *starlark.Thread, module string) (starlark.StringDict, error) {
            	if a.loader != nil {
            		mod, err := a.loader(thread, module)
            		if err == nil {
            			return mod, nil
            		}
            	}
            
            
	switch module {
            	case "render.star":
            		return render_runtime.LoadRenderModule()

JeffreyEsser · September 9, 2022, 2:13pm

Thanks @drudge for the quick answer!

Tavis_Gustafson · September 9, 2022, 10:56pm

Maybe you could make a generic app template with your code that everyone could use. I think it would be nice to have a feature rich app template.