Renamed to cli version.

Sources/cli-version/UpdateCommand.swift

@@ -0,0 +1,59 @@
+import ArgumentParser
+import Foundation
+import CliVersion
+import ShellClient
+
+extension CliVersionCommand {
+
+  struct Update: ParsableCommand {
+    static var configuration: CommandConfiguration = .init(
+      abstract: "Updates a version string to the git tag or git sha.",
+      discussion: "This command can be interacted with directly outside of the plugin context."
+    )
+
+    @OptionGroup var shared: SharedOptions
+
+    @Option(
+      name: .customLong("git-directory"),
+      help: "The git directory for the version."
+    )
+    var gitDirectory: String? = nil
+    
+    func run() throws {
+      try withDependencies {
+        $0.logger.logLevel = shared.verbose ? .debug : .info
+        $0.fileClient = .liveValue
+        $0.gitVersionClient = .liveValue
+        $0.shellClient = .liveValue
+      } operation: {
+        @Dependency(\.gitVersionClient) var gitVersion
+        @Dependency(\.fileClient) var fileClient
+        @Dependency(\.logger) var logger
+        @Dependency(\.shellClient) var shell
+
+        let targetUrl = parseTarget(shared.target)
+        let fileUrl = targetUrl
+          .appendingPathComponent(shared.fileName)
+
+        let fileString = fileUrl.fileString()
+
+        let currentVersion = try gitVersion.currentVersion(in: gitDirectory)
+
+        let fileContents = optionalTemplate
+          .replacingOccurrences(of: "nil", with: "\"\(currentVersion)\"")
+
+        if !shared.dryRun {
+          try fileClient.write(string: fileContents, to: fileUrl)
+          logger.info("Updated version file: \(fileString)")
+        } else {
+          logger.info("Would update file contents to:")
+          logger.info("\(fileContents)")
+        }
+      }
+    }
+  }
+}
+
+fileprivate enum UpdateError: Error {
+  case versionFileDoesNotExist(path: String)
+}