Introduce anco cli tool

Sources/CliTool/Anco.swift

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+import KanaKanjiConverterModuleWithDefaultDictionary
+import ArgumentParser
+
+@main
+public struct Anco: ParsableCommand {
+    public static var configuration = CommandConfiguration(
+        abstract: "Anco is A(zooKey) Kana-Ka(n)ji (co)nverter",
+        subcommands: [Subcommands.Run.self],
+        defaultSubcommand: Subcommands.Run.self
+    )
+
+    public init() {}
+}

Sources/CliTool/Subcommands/Commands.swift

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+/// namespace for subcommands
+enum Subcommands {}

Sources/CliTool/Subcommands/RunCommand.swift

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+import KanaKanjiConverterModuleWithDefaultDictionary
+import ArgumentParser
+import Foundation
+
+extension Subcommands {
+    struct Run: ParsableCommand {
+        @Argument(help: "ひらがなで表記された入力")
+        var input: String = ""
+
+        @Option(name: [.customLong("config_n_best")], help: "The parameter n (n best parameter) for internal viterbi search.")
+        var configNBest: Int = 10
+        @Option(name: [.customShort("n"), .customLong("top_n")], help: "Display top n candidates.")
+        var displayTopN: Int = 1
+
+        @Flag(name: [.customLong("disable_prediction")], help: "Disable producing prediction candidates.")
+        var disablePrediction = false
+
+        static var configuration = CommandConfiguration(commandName: "run", abstract: "Show help for this utility.")
+
+        @MainActor mutating func run() {
+            let converter = KanaKanjiConverter()
+            var composingText = ComposingText()
+            composingText.insertAtCursorPosition(input, inputStyle: .direct)
+            let result = converter.requestCandidates(composingText, options: requestOptions())
+            for candidate in result.mainResults.prefix(self.displayTopN) {
+                print(candidate.text)
+            }
+        }
+
+        func requestOptions() -> ConvertRequestOptions {
+            .withDefaultDictionary(
+                N_best: configNBest,
+                requireJapanesePrediction: !disablePrediction,
+                requireEnglishPrediction: false,
+                keyboardLanguage: .ja_JP,
+                typographyLetterCandidate: false,
+                unicodeCandidate: true,
+                englishCandidateInRoman2KanaInput: true,
+                fullWidthRomanCandidate: false,
+                halfWidthKanaCandidate: false,
+                learningType: .nothing,
+                maxMemoryCount: 0,
+                shouldResetMemory: false,
+                memoryDirectoryURL: URL(fileURLWithPath: ""),
+                sharedContainerURL: URL(fileURLWithPath: ""),
+                metadata: .init(appVersionString: "anco")
+            )
+        }
+    }
+}