mirror of
https://github.com/apple/swift-argument-parser.git
synced 2026-05-07 20:12:41 +00:00
Nate Cook
0bac2cc0f1
This adds underscored initializers that let library users add `= nil` to declarations of optional `@Option` and `@Argument` properties. Previously, default values have been available for properties of non-optional types only. These new initializers use `_OptionalNilComparisonType` as the wrapped value parameter, so only a `nil` literal is acceptable in the default value position. This avoids the problem of declaring an optional property with a non-`nil` default, which ends up negating the purpose of an optional.
37 lines
1017 B
Swift
37 lines
1017 B
Swift
//===----------------------------------------------------------*- swift -*-===//
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//
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// This source file is part of the Swift Argument Parser open source project
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//
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// Copyright (c) 2020 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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//
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//===----------------------------------------------------------------------===//
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import ArgumentParser
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@main
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struct Repeat: ParsableCommand {
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@Option(help: "The number of times to repeat 'phrase'.")
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var count: Int? = nil
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@Flag(help: "Include a counter with each repetition.")
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var includeCounter = false
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@Argument(help: "The phrase to repeat.")
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var phrase: String
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mutating func run() throws {
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let repeatCount = count ?? 2
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for i in 1...repeatCount {
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if includeCounter {
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print("\(i): \(phrase)")
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} else {
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print(phrase)
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}
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}
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}
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}
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