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Added defaultValueMaybe #22

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mrboring wants to merge 1 commit into from
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Added defaultValueMaybe #22

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10 changes: 10 additions & 0 deletions src/FSharp.SystemCommandLine/Inputs.fs
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,16 @@ module Input =
/// An alias for `defaultValue` to set the default value of an option or argument.
let def = defaultValue

/// Sets the default value of an option or argument.
let defaultValueMaybe (defaultValue: 'T option) (input: ActionInput<'T>) =
match defaultValue with
| Some defaultValue' ->
input
|> editOption (fun o -> o.DefaultValueFactory <- (fun _ -> defaultValue'))
|> editArgument (fun a -> a.DefaultValueFactory <- (fun _ -> defaultValue'))
| None ->
input

/// Sets the default value factory of an option or argument.
let defaultValueFactory (defaultValueFactory: Parsing.ArgumentResult -> 'T) (input: ActionInput<'T>) =
input
Expand Down