custom Decoder is not called on input struct, it is only called on fields within a struct

[twmb]

If I pass a type that implements Decoder to Process, the EnvDecode function is not called. However, if a field within my input struct implements Decoder, then EnvDecode is called.

In https://go.dev/play/p/wforR2YscKr, I would expect CALLED to be printed after both 1 and 2. It is only printed after 2.

[sethvargo]

Hi @twmb

Thank you for opening an issue. I'm not sure how this makes sense. The custom decoder accepts the environment variable as an input to the function. In your example, there's no place to define which environment variable to pass to the custom decode function.

What problem are you trying to solve?

[twmb]

I think I see what you mean: it's impossible to define a key for the top level input.

What's odd is that EnvDecode is being called at all given there can be no key in the first example, and there is no key in the second example. This is an artifact of the investigation into #61

[sethvargo]

I think I see what you mean: it's impossible to define a key for the top level input.

Right - you have to wrap it in another struct unfortunately. That's just a limitation of Go.

What's odd is that EnvDecode is being called at all given there can be no key in the first example, and there is no key in the second example. This is an artifact of the investigation into #61

Yea that makes sense. I'm going to close this out and we'll figure out a solution to #61.