Can ArgParseResults be constructed?

[ctaggart]

For fsprojects/Paket#839, I would like to call these functions by constructing and passing in the ArgParseResults. Is this possible?

let args = [ RestoreArgs.Force ; RestoreArgs.References_Files "abc.txt" ]
Program.restore (ArgParseResults<RestoreArgs>(args))

[ctaggart]

My use case is I want a way to get this working:

[eiriktsarpalis]

You can sort of achieve this by doing the following:

type UnionArgParser<'Args when 'Args :> IArgParserTemplate> with
    member parser.CreateParseResultsOfList(inputs : 'Args list) : ParseResults<'Args> =
        let cliParams = parser.PrintCommandLine inputs // unparse inputs to cli form
        parser.ParseCommandLine(inputs = cliParams, ignoreMissing = true)

This will unparse the inputs to string and then re-parse them to form the required ParseResults object. Note that this will not work with arguments that carry the NoCommandLineAttribute.

[ctaggart]

Awesome! Thanks.

[ctaggart]

@eiriktsarpalis Any chance we can get something like parser.CreateParseResultsOfList baked in?

[eiriktsarpalis]

@ctaggart I'm willing to accept PRs that implement this :-)