Provide IConfiguration as a parameter to use_config

[toburger]

It would be useful when the use_config function of the application computation expression provides access to the Microsoft.Extensions.Configuration.IConfiguration object or the HttpContext itself.

I wanted to read the application settings from ASP.NET Core and put it in a Settings record, but my solution is pretty ugly.

let configureContextAccessor (services: IServiceCollection) =
    services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>()

let setupConfiguration () =
    let ctx = HttpContextAccessor()
    let config = ctx.HttpContext.GetService<IConfiguration>()
    { SampleSetting = config.["sampleSetting"] }

let app = application {
    ...
    service_config configureContextAccessor
    use_config setupConfiguration
    ...
}

I couldn't find a nicer way to access the IConfiguration object.

[Krzysztof-Cieslak]

Yes, currently accessing IConfiguration on the application level is a problem. I think I'd be open to changing use_config to take IConfiguration -> 'T as a parameter, instead of just 'T

[Krzysztof-Cieslak]

Fixed in https://github.com/SaturnFramework/Saturn/pull/157