List all targets when suggesting the use of --target flag.

Sources/Shark/XcodeProjectHelper.swift

@@ -26,18 +26,19 @@ struct XcodeProjectHelper {
 
     func resourcePaths() throws -> ResourcePaths {
         let eligibleTargets = xcodeproj.pbxproj.nativeTargets.filter({ $0.productType == .application || $0.productType == .framework })
+        let eligibleTargetsHelpString = "The available targets are:\n\(eligibleTargets.map({ "- \($0.name)" }).joined(separator: "\n"))"
         let selectedTarget: PBXNativeTarget
 
         if let targetName = targetName {
             guard let target = eligibleTargets.first(where: { $0.name == targetName }) else {
-                print("No target found with name \(targetName). The available targets are:\n\(eligibleTargets.map({ "- \($0.name)" }).joined(separator: "\n"))")
+                print("No target found with name \(targetName).\n\(eligibleTargetsHelpString)")
                 exit(EXIT_FAILURE)
             }
 
             selectedTarget = target
         } else {
             guard eligibleTargets.count == 1 else {
-                print("Multiple application targets found, please specify the target by using the --target flag")
+                print("Multiple application targets found, please specify the target by using the --target flag.\n\(eligibleTargetsHelpString)")
                 exit(EXIT_FAILURE)
             }