Optional generation of extension (R.xx)

Optional generation of Colors/Fonts/Images/Stringium extension

Fix swiftlint warning

Sources/ResgenSwift/Fonts/Fonts.swift

@@ -22,7 +22,6 @@ struct Fonts: ParsableCommand {
 
     static let toolName = "Fonts"
     static let defaultExtensionName = "Font"
-    static let defaultExtensionNameUIKit = "UIFont"
 
     // MARK: - Command Options
 
@@ -61,16 +60,25 @@ struct Fonts: ParsableCommand {
             isSwiftUI: true
         )
 
-        FontExtensionGenerator.writeExtensionFile(
-            fontsNames: fontsNames,
-            staticVar: options.staticMembers,
-            extensionName: options.extensionNameUIKit,
-            extensionFilePath: options.extensionFilePathUIKit,
-            isSwiftUI: false
-        )
+        if let extensionNameUIKit = options.extensionNameUIKit,
+           let extensionFilePathUIKit = options.extensionFilePathUIKit {
+            FontExtensionGenerator.writeExtensionFile(
+                fontsNames: fontsNames,
+                staticVar: options.staticMembers,
+                extensionName: extensionNameUIKit,
+                extensionFilePath: extensionFilePathUIKit,
+                isSwiftUI: false
+            )
+        }
 
-        print("Info.plist has been updated with:")
-        print("\(FontPlistGenerator.generatePlistUIAppsFontContent(for: fontsNames, infoPlistPaths: options.infoPlistPaths))")
+        if options.infoPlistPaths.isEmpty == false {
+            let plistUpdateFontsData = FontPlistGenerator.generatePlistUIAppsFontContent(
+                for: fontsNames,
+                infoPlistPaths: options.infoPlistPaths
+            )
+            print("Info.plist has been updated with:")
+            print(plistUpdateFontsData)
+        }
 
         print("[\(Self.toolName)] Fonts generated")
     }