feat: Adds generate-config command.

Sources/hpa/GenerateConfigCommand.swift

@@ -0,0 +1,54 @@
+import ArgumentParser
+import CliClient
+import Dependencies
+
+struct GenerateConfigurationCommand: AsyncParsableCommand {
+
+  static let commandName = "generate-config"
+
+  static let configuration = CommandConfiguration(
+    commandName: commandName,
+    abstract: "\("Generate a local configuration file.".blue)",
+    discussion: """
+
+    If a directory is not supplied then a configuration file will be created
+    at \("'~/.config/hpa-playbook/config'".yellow).
+
+    """
+  )
+
+  @Option(
+    name: .shortAndLong,
+    help: "Directory to generate the configuration in.",
+    completion: .directory
+  )
+  var path: String?
+
+  @OptionGroup var globals: BasicGlobalOptions
+
+  mutating func run() async throws {
+    try await _run()
+  }
+
+  private func _run() async throws {
+    try await withSetupLogger(commandName: Self.commandName, globals: globals) {
+      @Dependency(\.cliClient) var cliClient
+
+      let actualPath: String
+
+      if let path {
+        actualPath = "\(path)/config"
+      } else {
+        let path = "~/.config/hpa-playbook/"
+        try await cliClient.runCommand(
+          quiet: false,
+          shell: globals.shellOrDefault,
+          "mkdir", "-p", path
+        )
+        actualPath = "\(path)/config"
+      }
+
+      try cliClient.createConfiguration(actualPath)
+    }
+  }
+}