Optional generation of Images extension. Make extensionOutputPath optional for Images and Colors cause it's not needed if no extensionName are provided

Sources/ResgenSwift/Colors/Colors.swift

@@ -110,6 +110,17 @@ struct Colors: ParsableCommand {
             }
         }
 
+        // If an extension need to be generated, ensure extensionOutputPath is defined
+        if options.extensionName != nil ||
+            options.extensionNameUIKit != nil {
+            guard let extensionOutputPath = options.extensionOutputPath,
+                  extensionOutputPath.isEmpty == false else {
+                let error = ColorsToolError.missingExtensionPath
+                print(error.description)
+                Self.exit(withError: error)
+            }
+        }
+
         // Check if needed to regenerate
         let fileToCompareToInput: String = {
             // If there is no extension file to compare

Sources/ResgenSwift/Colors/ColorsToolError.swift

@@ -17,6 +17,7 @@ enum ColorsToolError: Error {
     case fileNotExists(String)
     case badColorDefinition(String, String)
     case deleteExistingColors(String)
+    case missingExtensionPath
 
     var description: String {
         switch self {
@@ -43,6 +44,9 @@ enum ColorsToolError: Error {
 
         case .deleteExistingColors(let assetsFolder):
             return "error: [\(Colors.toolName)] An error occured while deleting colors folder `\(assetsFolder)`"
+
+        case .missingExtensionPath:
+            return "error: [\(Colors.toolName)] Extension need to be generated but no `extensionOutputPath` is provided"
         }
     }
 }

Sources/ResgenSwift/Colors/ColorsToolOptions.swift

@@ -24,12 +24,12 @@ struct ColorsToolOptions: ParsableArguments {
     @Option(help: "Path of xcassets where to generate colors", transform: { $0.replaceTiltWithHomeDirectoryPath() })
     var xcassetsPath: String
 
-    @Option(help: "Path where to generate the extension.", transform: { $0.replaceTiltWithHomeDirectoryPath() })
-    var extensionOutputPath: String
-
     @Option(help: "Tell if it will generate static properties or not")
     var staticMembers: Bool = false
 
+    @Option(help: "Path where to generate the extension.", transform: { $0.replaceTiltWithHomeDirectoryPath() })
+    var extensionOutputPath: String?
+
     @Option(help: "Extension name. If not specified, no extension will be generated.")
     var extensionName: String?
 
@@ -56,7 +56,7 @@ extension ColorsToolOptions {
     }
 
     var extensionFilePath: String? {
-        guard let extensionFileName else { return nil }
+        guard let extensionOutputPath, let extensionFileName else { return nil }
 
         return "\(extensionOutputPath)/\(extensionFileName)"
     }
@@ -73,7 +73,7 @@ extension ColorsToolOptions {
     }
 
     var extensionFilePathUIKit: String? {
-        guard let extensionFileNameUIKit else { return nil }
+        guard let extensionOutputPath, let extensionFileNameUIKit else { return nil }
 
         return "\(extensionOutputPath)/\(extensionFileNameUIKit)"
     }