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Alex Rupérez

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Published: 29 Jan 14:32
I starred jpsim/SourceKitten at GitHub.
An adorable little framework and command line tool for interacting with SourceKit.
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SourceKitten

An adorable little framework and command line tool for interacting with SourceKit.

SourceKitten links and communicates with sourcekitd.framework to parse the Swift AST, extract comment docs for Swift or Objective-C projects, get syntax data for a Swift file and lots more!

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Installation

Building SourceKitten requires Xcode 10.2 or later or a Swift 5.0 toolchain or later with the Swift Package Manager.

SourceKitten typically supports previous versions of SourceKit.

Homebrew

Run brew install sourcekitten.

Swift Package Manager

Run swift build in the root directory of this project.

Xcode (via Make)

Run make install in the root directory of this project.

Package

Download and open SourceKitten.pkg from the releases tab.

Command Line Usage

Once SourceKitten is installed, you may use it from the command line.

$ sourcekitten help
Available commands:

   complete    Generate code completion options
   doc         Print Swift or Objective-C docs as JSON
   format      Format Swift file
   help        Display general or command-specific help
   index       Index Swift file and print as JSON
   request     Run a raw sourcekit request
   structure   Print Swift structure information as JSON
   syntax      Print Swift syntax information as JSON
   version     Display the current version of SourceKitten

How is SourceKit resolved?

SourceKitten searches for SourceKit in the following order:

  • $XCODE_DEFAULT_TOOLCHAIN_OVERRIDE
  • $TOOLCHAIN_DIR
  • xcrun -find swift
  • /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
  • /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
  • ~/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
  • ~/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain

On Linux, SourceKit is expected to be located in /usr/lib/libsourcekitdInProc.so or specified by the LINUX_SOURCEKIT_LIB_PATH environment variable.

Projects Built With SourceKitten

  • SwiftLint: A tool to enforce Swift style and conventions.
  • Jazzy: Soulful docs for Swift & Objective-C.
  • Sourcery: Meta-programming for Swift, stop writing boilerplate code.
  • SwiftyMocky: Framework for mock generation.
  • SourceKittenDaemon: Swift Auto Completions for any Text Editor.
  • SourceDocs: Command Line Tool that generates Markdown documentation from inline source code comments.
  • Cuckoo: First boilerplate-free mocking framework for Swift.
  • IBAnalyzer: Find common xib and storyboard-related problems without running your app or writing unit tests.
  • Taylor: Measure Swift code metrics and get reports in Xcode, Jenkins and other CI platforms.
See More

Complete

Running sourcekitten complete --file file.swift --offset 123 or sourcekitten complete --text "0." --offset 2 will print out code completion options for the offset in the file/text provided:

[{
  "descriptionKey" : "advancedBy(n: Distance)",
  "associatedUSRs" : "s:FSi10advancedByFSiFSiSi s:FPSs21RandomAccessIndexType10advancedByuRq_S__Fq_Fqq_Ss16ForwardIndexType8Distanceq_ s:FPSs16ForwardIndexType10advancedByuRq_S__Fq_Fqq_S_8Distanceq_ s:FPSs10Strideable10advancedByuRq_S__Fq_Fqq_S_6Strideq_ s:FPSs11_Strideable10advancedByuRq_S__Fq_Fqq_S_6Strideq_",
  "kind" : "source.lang.swift.decl.function.method.instance",
  "sourcetext" : "advancedBy(<#T##n: Distance##Distance#>)",
  "context" : "source.codecompletion.context.thisclass",
  "typeName" : "Int",
  "moduleName" : "Swift",
  "name" : "advancedBy(n: Distance)"
},
{
  "descriptionKey" : "advancedBy(n: Self.Distance, limit: Self)",
  "associatedUSRs" : "s:FeRq_Ss21RandomAccessIndexType_SsS_10advancedByuRq_S__Fq_FTqq_Ss16ForwardIndexType8Distance5limitq__q_",
  "kind" : "source.lang.swift.decl.function.method.instance",
  "sourcetext" : "advancedBy(<#T##n: Self.Distance##Self.Distance#>, limit: <#T##Self#>)",
  "context" : "source.codecompletion.context.superclass",
  "typeName" : "Self",
  "moduleName" : "Swift",
  "name" : "advancedBy(n: Self.Distance, limit: Self)"
},
...
]

To use the iOS SDK, pass -sdk and -target arguments preceded by --:

sourcekitten complete --text "import UIKit ; UIColor." --offset 22 -- -target arm64-apple-ios9.0 -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.0.sdk

Doc

Running sourcekitten doc will pass all arguments after what is parsed to xcodebuild (or directly to the compiler, SourceKit/clang, in the --single-file mode).

Example usage

  1. sourcekitten doc -- -workspace SourceKitten.xcworkspace -scheme SourceKittenFramework
  2. sourcekitten doc --single-file file.swift -- -j4 file.swift
  3. sourcekitten doc --module-name Alamofire -- -project Alamofire.xcodeproj
  4. sourcekitten doc -- -workspace Haneke.xcworkspace -scheme Haneke
  5. sourcekitten doc --objc Realm/Realm.h -- -x objective-c -isysroot $(xcrun --show-sdk-path) -I $(pwd)

Structure

Running sourcekitten structure --file file.swift or sourcekitten structure --text "struct A { func b() {} }" will return a JSON array of structure information:

{
  "key.substructure" : [
    {
      "key.kind" : "source.lang.swift.decl.struct",
      "key.offset" : 0,
      "key.nameoffset" : 7,
      "key.namelength" : 1,
      "key.bodyoffset" : 10,
      "key.bodylength" : 13,
      "key.length" : 24,
      "key.substructure" : [
        {
          "key.kind" : "source.lang.swift.decl.function.method.instance",
          "key.offset" : 11,
          "key.nameoffset" : 16,
          "key.namelength" : 3,
          "key.bodyoffset" : 21,
          "key.bodylength" : 0,
          "key.length" : 11,
          "key.substructure" : [

          ],
          "key.name" : "b()"
        }
      ],
      "key.name" : "A"
    }
  ],
  "key.offset" : 0,
  "key.diagnostic_stage" : "source.diagnostic.stage.swift.parse",
  "key.length" : 24
}

Syntax

Running sourcekitten syntax --file file.swift or sourcekitten syntax --text "import Foundation // Hello World" will return a JSON array of syntax highlighting information:

[
  {
    "offset" : 0,
    "length" : 6,
    "type" : "source.lang.swift.syntaxtype.keyword"
  },
  {
    "offset" : 7,
    "length" : 10,
    "type" : "source.lang.swift.syntaxtype.identifier"
  },
  {
    "offset" : 18,
    "length" : 14,
    "type" : "source.lang.swift.syntaxtype.comment"
  }
]

Request

Running sourcekitten request --yaml [FILE|TEXT] will execute a sourcekit request with the given yaml. For example:

key.request: source.request.cursorinfo
key.sourcefile: "/tmp/foo.swift"
key.offset: 8
key.compilerargs:
  - "/tmp/foo.swift"

SourceKittenFramework

Most of the functionality of the sourcekitten command line tool is actually encapsulated in a framework named SourceKittenFramework.

If you’re interested in using SourceKitten as part of another tool, or perhaps extending its functionality, take a look at the SourceKittenFramework source code to see if the API fits your needs.

Note: SourceKitten is written entirely in Swift, and the SourceKittenFramework API is not designed to interface with Objective-C.

License

MIT licensed.