wip

Sources/git-version/GenerateCommand.swift

@@ -0,0 +1,49 @@
+import ArgumentParser
+import Dependencies
+import Foundation
+import GitVersion
+import ShellClient
+
+extension GitVersionCommand {
+
+  struct Generate: ParsableCommand {
+    static var configuration: CommandConfiguration = .init(
+      abstract: "Generates a version file in a command line tool that can be set via the git tag or git sha."
+    )
+
+    @OptionGroup var shared: SharedOptions
+
+    func run() throws {
+      @Dependency(\.logger) var logger: Logger
+      @Dependency(\.fileClient) var fileClient
+
+      let targetUrl = parseTarget(shared.target)
+      let fileUrl = targetUrl.appendingPathComponent(shared.fileName)
+
+      let fileString = fileUrl.fileString()
+
+      guard !FileManager.default.fileExists(atPath: fileUrl.absoluteString) else {
+        logger.info("File already exists at path.")
+        throw GenerationError.fileExists(path: fileString)
+      }
+
+      if !shared.dryRun {
+        try fileClient.write(string: template, to: fileUrl)
+        logger.info("Generated file at: \(fileString)")
+      } else {
+        logger.info("Would generate file at: \(fileString)")
+      }
+
+    }
+  }
+}
+
+fileprivate enum GenerationError: Error {
+  case fileExists(path: String)
+}
+
+fileprivate let template = """
+// Do not set this variable, it is set during the build process.
+let VERSION: String? = nil
+
+"""