Pecker

pecker is a tool to automatically detect unused code. It based on IndexStoreDB and SwiftSyntax.

If you have questions, feel free to connect me, my Twitter Roy, Email: roy.cao1991@gmail.com.

Language Switch: 中文.

Why use this?

During the project development process, you may write a lot of code. Over time, a lot of code is no longer used, but it is difficult to find. pecker can help you locate these unused code conveniently and accurately.

Features

pecker can detect the following kinds of unused Swift code.

1. class
2. struct
3. enum
4. protocol
5. function
6. typealias
7. operator

Installation

Manually

$ git clone https://github.com/woshiccm/Pecker.git
$ cd Pecker
$ make install

mint

mint install woshiccm/Pecker

With that installed and on our bin folder, now we can use it.

Usage

Xcode

1. Click on your project in the file list, choose your target under TARGETS, click the Build Phases tab and add a New Run Script Phase by clicking the little plus icon in the top left.
2. Paste the following script:

/usr/local/bin/pecker

Command Line Usage

pecker [OPTIONS]

• -v/--version: Prints the pecker version and exits.
• -i/--index-store-path: The Index path of your project, if unspecified, the default is ~Library/Developer/Xcode/DerivedData//Index/DataStore.

Run pecker in the project target to detect. Project will be searched Swift files recursively.

Rules

Current only 5 rules are included in Pecker, They are skip_public, xctest, attributes, xml, comment. You can add them to disabled_rules if you don't need it. You can also check Source/PeckerKit/Rules directory to see their implementation.

skip_public

This rule means skip detect public class, struct, function, etc. Usually the public code is provided for other users, so it is difficult to determine whether it is used. So we don't detect it by default. But in some cases, such as using submodule to organize code, you need to detect public code, you can add it to disabled_rules.

xctest

XCTest is special, we stipulate that ignore classes inherited from XCTestCase and functions of this class that hasPrefix "test" and do not contain parameters.

class ExampleUITests: XCTestCase {

    func testExample() { //used
    }

    func test(name: String) { // unused
    }
    
    func get() { // unused
    }
}

attributes

If a Declaration contains the attribute in BlackListAttribute, skip. Such as IBAction, we are continuously collecting, if you find new cases, please let us know.

@IBAction func buttonTap(_ sender: Any) { // used
        
}

xml

If code is used in xib or storyboard, it also means used.

comment

Code can be ignore with a comment inside a source file with the following format:

• Ignore specified code

// pecker:ignore 

For example:

// pecker:ignore
class TestCommentObject { // skip
    
    // pecker:ignore
    func test1() { // skip
    }
    
    func test2() { // unused
    }
}

• Ignore all symbols under scope

// pecker:ignore all

For example:

// pecker:ignore all
class TestCommentObject { // skip
    
    func test1() { // skip
    }
    
    struct SubClass { // skip
        
        func test2() { // skip
        }
    }
}

Other rules

These rules are used by default, you cannot configure them.

override

Skip declarations that override another. This works for both subclass overrides & protocol extension overrides.

protocol ExampleProtocol {
	func test() // used
}

class Example: ExampleProtocol {
    func test() { // used
    }
}

class Animal {
    func run() {  // used
    }
}

class Dog: Animal {
    override func run() { // used
    }
}

extensions

Referenced elsewhere means used, except for extensions.

class UnusedExample { // unused
    
}

extension UnusedExample {
    
}

Configuration

This is optinal, will use default, if unspecified. Configure pecker by adding a .pecker.yml file from the directory you'll run pecker from. The following parameters can be configured:

Rule inclusion:

• disabled_rules: Disable rules from the default enabled set.

Reporter inclusion:

• xcode: Warnings displayed in the IDE.

• json: Generate a json file named pecker.result.json, you can set path by output_file, if unspecified, the default is current project directory path.

  

reporter: "xcode"

disabled_rules:
  - skip_public

included: # paths to include during detecting. `--path` is ignored if present.
  - ./
  
excluded: # paths to ignore during detecting. Takes precedence over `included`.
  - Carthage
  - Pods

blacklist_files: # files to ignore during detecting, only need to add file name, the file extension default is swift.
  - HomeViewController

blacklist_symbols: # symbols to ignore during detecting, contains class, struct, enum, etc.
  - AppDelegate
  - viewDidLoad

output_file: "/Users/ming/Desktop/PeckerResultDirectory"

Contributions and support

pecker is developed completely in the open.

Any contributing and pull requests are warmly welcome. If you are interested in developing pecker, submit ideas and submit pull requests!

Contributors

Licence

pecker is released under the MIT License.