56 lines
1.4 KiB
Swift
56 lines
1.4 KiB
Swift
// Copyright 2021 Carton contributors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import ArgumentParser
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extension Sequence {
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public func asyncMap<T>(
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_ transform: (Element) async throws -> T
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) async rethrows -> [T] {
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var values = [T]()
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for element in self {
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try await values.append(transform(element))
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}
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return values
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}
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}
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/// A type that can be executed as part of a nested tree of commands.
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extension AsyncParsableCommand {
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public mutating func run() throws {
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throw CleanExit.helpRequest(self)
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}
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}
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public protocol AsyncMain {
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associatedtype Command: ParsableCommand
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}
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extension AsyncMain {
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public static func main() async {
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do {
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var command = try Command.parseAsRoot()
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if var command = command as? AsyncParsableCommand {
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try await command.run()
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} else {
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try command.run()
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}
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} catch {
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Command.exit(withError: error)
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}
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}
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}
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