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Implement [<ArgumentFlag>] for two-case DUs (#242)

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Patrick Stevens
2024-09-04 22:48:36 +01:00
committed by GitHub
parent bdce82fb7a
commit e4cbab3209
15 changed files with 1085 additions and 126 deletions
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9
WoofWare.Myriad.Plugins.Attributes/ArgParserAttributes.fs
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@@ -61,3 +61,12 @@ type ParseExactAttribute (format : string) =
/// `TimeSpan.ParseExact (s, @"hh\:mm\:ss", CultureInfo.InvariantCulture).
type InvariantCultureAttribute () =
inherit Attribute ()
/// Attribute placed on a field of a two-case no-data discriminated union, indicating that this is "basically a bool".
/// For example: `type DryRun = | [<ArgumentFlag true>] Dry | [<ArgumentFlag false>] Wet`
/// A record with `{ DryRun : DryRun }` will then be parsed like `{ DryRun : bool }` (so the user supplies `--dry-run`),
/// but that you get this strongly-typed value directly in the code (so you `match args.DryRun with | DryRun.Dry ...`).
///
/// You must put this attribute on both cases of the discriminated union, with opposite values in each case.
type ArgumentFlagAttribute (flagValue : bool) =
inherit Attribute ()