SetHandler improvements #1729
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SetHandler improvements #1729
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baronfel
reviewed
May 5, 2022
| @@ -44,7 +44,7 @@ public async Task Sets_output_mode_to_Ansi_when_specified_by_output_directive(Ou | |||
| OutputMode detectedOutputMode = OutputMode.Auto; | |||
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| var command = new Command("hello"); | |||
| command.SetHandler((InvocationContext ctx) => | |||
| command.SetHandler(ctx => | |||
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it's really nice for the simple handlers to be naturally-typed here (and in the other 1000 callsites in this PR)
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Agreed. Settling on InvocationContext for the case where we do this (i.e. removing support for ParseResult, etc. as parameters) reduces a lot of DI-ish complexity in these handlers. If we pull this thread hard enough, the need for the service provider might disappear.
baronfel
reviewed
May 5, 2022
Keboo
reviewed
May 5, 2022
| { | ||
| var valueSource = ValueDescriptorDefaultValueSource.Instance; | ||
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| valueSource.TryGetValue(valueDescriptor, context, out var value); |
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nit: I dislike var here as it is not clear what the type of value is.
| { | ||
| var valueSource = ValueDescriptorDefaultValueSource.Instance; | ||
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| valueSource.TryGetValue(valueDescriptor, context, out var value); |
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Should we care about the case where TryGetValue returns false? Should there be something line BoundValue.None to return in that case?
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These changes attempt to improve the clarity of the
SetHandlermethods by removing theparamsparameters and replacing them with a number ofIValueDescriptor<T>parameters matching the number of generic type arguments.Since DI-like behaviors are fairly non-obvious, I'll likely also experiment here with removing the internal service provider and see if
BinderBase<T>can fulfill its role.