diff --git a/Makefile b/Makefile
index 909f55f..26df0f9 100644
--- a/Makefile
+++ b/Makefile
@@ -42,6 +42,5 @@ graph:
 .PHONY: single
 single:
 	leakDetect \
-		--targetType singleFile \
 		--sdk macosx \
-		--file temp.swift --verbose
+		--file fixture/temp.swift
diff --git a/Package.swift b/Package.swift
index 86aa3ac..e087dab 100644
--- a/Package.swift
+++ b/Package.swift
@@ -40,6 +40,7 @@ let package = Package(
                 .product(name: "SourceKittenFramework", package: "SourceKitten"),
                 .product(name: "SKClient", package: "TypeFill"),
                 "LeakDetectKit",
+                "PathKit",
             ]
         ),
 
diff --git a/README.md b/README.md
index 40e730d..6d0e401 100644
--- a/README.md
+++ b/README.md
@@ -64,8 +64,4 @@ leakDetect \
     --module LeakDetectorDemo \
     --targetType xcworkspace \
     --file LeakDetectorDemo.xcworkspace
-
-# Mode:
-# * assign: detecting assign instance function `x = self.func` or `y(self.func)`.
-# * capture: detecting capture instance in closure.
 ```
diff --git a/Sources/LeakDetect/Arguments+Ex.swift b/Sources/LeakDetect/Arguments+Ex.swift
index f88f1a6..cc3ed0d 100644
--- a/Sources/LeakDetect/Arguments+Ex.swift
+++ b/Sources/LeakDetect/Arguments+Ex.swift
@@ -8,6 +8,7 @@
 import ArgumentParser
 import Foundation
 import SKClient
+import PathKit
 
 extension Reporter: ExpressibleByArgument {
     static let all: String = Reporter
@@ -24,10 +25,37 @@ public enum TargetType: String, CaseIterable, ExpressibleByArgument {
         .map(\.rawValue)
         .joined(separator: "|")
 
+    case auto
     case xcodeproj
     case xcworkspace
     case singleFile
     case spm
+    
+    func detect(_ path: String) -> TargetType {
+        guard case .auto = self else {
+            return self
+        }
+        
+        if path.hasSuffix(".xcodeproj") {
+            return .xcodeproj
+        }
+        
+        if path.hasSuffix(".xcworkspace") {
+            return .xcworkspace
+        }
+        
+        if path.hasSuffix(".swift") && !path.hasSuffix("Package.swift") {
+            return .singleFile
+        }
+        
+        let path = Path(path)
+        let package = path + "Package.swift"
+        if path.isDirectory && package.exists {
+            return .spm
+        }
+        
+        return .singleFile
+    }
 }
 
 enum Mode: String, CaseIterable, ExpressibleByArgument {
diff --git a/Sources/LeakDetect/Command.swift b/Sources/LeakDetect/Command.swift
index 0d618f4..1ea950f 100644
--- a/Sources/LeakDetect/Command.swift
+++ b/Sources/LeakDetect/Command.swift
@@ -23,10 +23,6 @@ struct Command: ParsableCommand {
             --module LeakDetectorDemo \
             --targetType xcworkspace \
             --file LeakDetectorDemo.xcworkspace
-
-        # Mode:
-        # * assign: detecting assign instance function `x = self.func` or `y(self.func)`.
-        # * capture: detecting capture instance in closure.
         """,
         version: "0.0.3"
     )
@@ -41,7 +37,7 @@ struct Command: ParsableCommand {
     var sdk: SDK = .iphonesimulator
 
     @Option(name: [.customLong("targetType", withSingleDash: false)], help: "[\(Reporter.all)]")
-    var targetType: TargetType = .xcodeproj
+    var targetType: TargetType = .auto
 
     @Option(name: [.customLong("module", withSingleDash: false)], help: "Name of Swift module to document (can't be used with `--single-file`)")
     var moduleName = ""
@@ -60,8 +56,8 @@ struct Command: ParsableCommand {
 
     private var module: Module? {
         let moduleName = self.moduleName.isEmpty ? nil : self.moduleName
-
-        switch targetType {
+        
+        switch targetType.detect(path) {
         case .spm:
             return Module(spmArguments: arguments, spmName: moduleName)
         case .singleFile:
@@ -82,11 +78,13 @@ struct Command: ParsableCommand {
                 self.moduleName,
             ]
             return Module(xcodeBuildArguments: arguments + newArgs, name: moduleName)
+        case .auto:
+            return nil
         }
     }
 
     mutating func run() throws {
-        if case .singleFile = targetType {
+        if case .singleFile = targetType.detect(path) {
             try SingleFilePipeline(path, arguments + [path] + sdk.pathArgs)
                 .detect(reporter, verbose)
             return
diff --git a/Sources/LeakDetectKit/Pipeline/Pipeline.swift b/Sources/LeakDetectKit/Pipeline/Pipeline.swift
index fca3372..ba439ed 100644
--- a/Sources/LeakDetectKit/Pipeline/Pipeline.swift
+++ b/Sources/LeakDetectKit/Pipeline/Pipeline.swift
@@ -69,18 +69,6 @@ public struct SingleFilePipeline {
         let visitors = state2(client)
         try client.editorOpen()
         let count = try visitors.detect(client, reporter, isVerbose)
-        print("Found blocks: \(visitors.capture.subVisitors.count)")
-//        let ids = visitors.capture.leakVisitors
-//            .flatMap(\.ids)
-//            .map {
-//                $0.withoutTrivia().description
-//            }
-//            .joined(separator: "\n")
-//        
-//        print("""
-//        Found blocks:
-//        \(ids)
-//        """)
         try client.editorClose()
         summery(count)
     }
diff --git a/temp.swift b/fixture/temp.swift
similarity index 100%
rename from temp.swift
rename to fixture/temp.swift