Argument parsing in function

[notramo]

I want to refactor argument parsing into a separate function. It would parse the arguments, and validate them (min/max for numbers, permissions for file paths, etc.), then return the result of the parse function.

// use it in main()
pub fn main() {
  // ...
  const validatedArgs = parseAndValidateArgs(
    // ...
  );
}

pub fn parseAndValidateArgs() { // what is the return type?
  // ...
  const cliArgs = clap.parse(
    // ...
  );

  // validate here

  // then return
  return cliArgs;
}

How do I specify the return type of the parseAndValidateArgs function in the above snippet? Is there a clean and readable way of doing it?

[Hejsil]

There is clap.Result. It's the function that generates the return type for clap.parse.

[notramo]

@Hejsil could you provide an example usage in the above snippet? Simply putting it as clap.Result into the return type definition doesn't work. Do I have to use something like @Type(clap.Result)?

[Hejsil]

Something along the lines of this:

const params = ...;

pub fn parseAndValidateArgs() !clap.Result(clap.Help, params, clap.parsers.default) {
  const cliArgs = try clap.parse(clap.Help, params, clap.parsers.default);

  // validate here

  // then return
  return cliArgs;
}

[notramo]

It works, thank you.