Initial implementation of APKINDEX, fetching, reading, parsing, & merging

Sources/dpk-cli/Subcommands/DpkInstallCommand.swift

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+// SPDX-License-Identifier: Apache-2.0
+
+import ArgumentParser
+
+struct DpkInstallCommand: ParsableCommand {
+  static let configuration = CommandConfiguration(
+    commandName: "add",
+    abstract: "Install package(s) to the system.",
+    aliases: [ "a", "install" ])
+
+  @Argument(help: "One or more package names to install to the system.")
+  var packages: [String]
+
+  func run() throws {
+    print("installing \"\(packages.joined(separator: "\", \""))\"")
+  }
+}

Sources/dpk-cli/Subcommands/DpkRemoveCommand.swift

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+// SPDX-License-Identifier: Apache-2.0
+
+import ArgumentParser
+
+struct DpkRemoveCommand: ParsableCommand {
+  static let configuration = CommandConfiguration(
+    commandName: "remove",
+    abstract: "Remove specified package(s) from the system.",
+    aliases: [ "r", "rem", "del", "uninstall" ])
+
+  @Argument(help: "One or more package(s) to uninstall from the system.")
+  var packages: [String]
+
+  func run() throws {
+    print("uninstalling \"\(packages.joined(separator: "\", \""))\"")
+  }
+}

Sources/dpk-cli/Subcommands/DpkUpdateCommand.swift

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+// SPDX-License-Identifier: Apache-2.0
+
+import Foundation
+import ArgumentParser
+import darwin_apk
+
+struct DpkUpdateCommand: ParsableCommand {
+  static let configuration = CommandConfiguration(
+    commandName: "update",
+    abstract: "Update the system package repositories.",
+    aliases: [ "u" ])
+
+  func run() throws {
+    print("Updating package repositories")
+    var updater = ApkIndexUpdater()
+    updater.update()
+  }
+}

Sources/dpk-cli/Subcommands/DpkUpgradeCommand.swift

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+// SPDX-License-Identifier: Apache-2.0
+
+import ArgumentParser
+
+struct DpkUpgradeCommand: ParsableCommand {
+  static let configuration = CommandConfiguration(
+    commandName: "upgrade",
+    abstract: "Upgrade installed packages.",
+    aliases: [ "U" ])
+
+  @Argument(help: "Optionally specify packages to upgrade. Otherwise upgrade all packages installed on the system.")
+  var packages: [String] = []
+
+  func run() throws {
+    if packages.isEmpty {
+      print("upgrading system")
+    } else {
+      print("upgrading invidual packages: \"\(packages.joined(separator: "\", \""))\"")
+    }
+  }
+}