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πŸ“Š Extract and analyze the evolution of an iOS app's code.
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README.md

πŸ“Š SwiftInfo

GitHub release

SwiftInfo is a CLI tool that extracts, tracks and analyzes metrics that are useful for Swift apps. Besides the default tracking options that are shipped with the tool, you can also customize SwiftInfo to track pretty much anything that can be conveyed in a simple .swift script.

By default SwiftInfo will assume you're extracting info from a release build and send the final results to Slack, but it can be used to extract info from individual pull requests as well with the danger-SwiftInfo danger plugin.

Available Providers

Type Name Description Requirements
πŸ“¦ IPASizeProvider Size of the .ipa archive (Not the App Store size!) Successful xcodebuild archive and build logs
πŸ“Š CodeCoverageProvider Code coverage percentage Test logs, Xcode developer tools, Test targets with code coverage reports enabled
πŸ‘Ά TargetCountProvider Number of targets (dependencies) Build logs
🎯 TestCountProvider Sum of all test target's test count Test logs
⚠️ WarningCountProvider Number of warnings in a build Build logs
πŸ§™β€β™‚οΈ OBJCFileCountProvider Number of OBJ-C files and headers (for mixed OBJ-C / Swift projects) Build logs
⏰ LongestTestDurationProvider The name and duration of the longest test Test logs
πŸ› TotalTestDurationProvider Time it took to build and run all tests Test logs
πŸ–Ό LargestAssetCatalogProvider The name and size of the largest asset catalog Build logs
🎨 TotalAssetCatalogsSizeProvider The sum of the size of all asset catalogs Build logs
πŸ’» LinesOfCodeProvider Executable lines of code Same as CodeCoverageProvider.
🚚 ArchiveDurationProvider Time it took to build and archive the app Successful xcodebuild archive and build logs
πŸ“· LargestAssetProvider The largest asset in the project. Only considers files inside asset catalogs. Build logs

Usage

SwiftInfo extracts information by analyzing the logs that logs that Xcode generates when you build and/or test your app. Because it requires these logs to work, SwiftInfo is meant to be used alongside a build automation tool like fastlane. The following topics describe how you can retrieve these logs and setup SwiftInfo itself.

We'll show how to get the logs first as you'll need them to configure SwiftInfo.

Note: This repository contains an example project. Check it out to see the tool in action!

Retrieving raw logs with fastlane

If you use fastlane, you can expose the raw logs by adding the buildlog_path argument to scan (test logs) and gym (build logs). Here's a simple example of a fastlane step that runs tests, submits an archive to TestFlight and runs SwiftInfo (be sure to edit the folder paths to what's being used by your project):

desc "Submits a new beta build and runs SwiftInfo"
lane :beta do
  # Run tests, copying the raw logs to the project folder
  scan(
    scheme: "MyScheme",
    buildlog_path: "./build/tests_log"
  )

  # Archive the app, copying the raw logs to the project folder and the .ipa to the /build folder
  gym(
    workspace: "MyApp.xcworkspace",
    scheme: "Release",
    output_directory: "build",
    buildlog_path: "./build/build_log"
  )

  # Send to TestFlight
  pilot(
      skip_waiting_for_build_processing: true
  )

  # Run SwiftInfo
  sh("../Pods/SwiftInfo/bin/swiftinfo")

  # Commit and push SwiftInfo's result
  sh("git add ../SwiftInfo-output/SwiftInfoOutput.json")
  sh("git commit -m \"[ci skip] Updating SwiftInfo Output JSON\"")
  push_to_git_remote
end

Retrieving raw logs manually

An alternative that doesn't require fastlane is to simply manually run xcodebuild / xctest and pipe the output to a file. We don't recommend doing this in a real project, but it can be useful if you just want to test the tool without having to setup fastlane.

xcodebuild -workspace ./Example.xcworkspace -scheme Example &> ./build/build_log/Example-Release.log

Configuring SwiftInfo

SwiftInfo itself is configured by creating a Infofile.swift file in your project's root. Here's an example one:

import SwiftInfoCore

// 1
FileUtils.buildLogFilePath = "./build/build_log/MyApp-MyConfig.log"
FileUtils.testLogFilePath = "./build/tests_log/MyApp-MyConfig.log"

// 2
let projectInfo = ProjectInfo(xcodeproj: "MyApp.xcodeproj",
                              target: "MyTarget",
                              configuration: "MyConfig")

let api = SwiftInfo(projectInfo: projectInfo)

// 3
let output = api.extract(IPASizeProvider.self) +
             api.extract(WarningCountProvider.self) +
             api.extract(TestCountProvider.self) +
             api.extract(TargetCountProvider.self, args: .init(mode: .complainOnRemovals)) +
             api.extract(CodeCoverageProvider.self, args: .init(targets: ["NetworkModule", "MyApp"])) +
             api.extract(LinesOfCodeProvider.self, args: .init(targets: ["NetworkModule", "MyApp"]))

// 4

if isInPullRequestMode {
    // If called from danger-SwiftInfo, print the results to the pull request
    api.print(output: output)
} else {
    // If called manually, send the results to Slack...
    api.sendToSlack(output: output, webhookUrl: url)
    // ...and save the output to your repo so it serves as the basis for new comparisons.
    api.save(output: output)
}
  • 1: Use FileUtils to configure the path of your logs. If you're using fastlane and don't know what the name of the log files are going to be, just run it once to have it create them.
  • 2: Create a SwiftInfo instance by passing your project's information.
  • 3: Use SwiftInfo's extract() to extract and append all the information you want into a single property.
  • 4: Lastly, you can act upon this output. Here, I print the results to a pull request if danger-SwiftInfo is being used, or send it to Slack / save it to the repo if this is the result of a release build.

You can see SwiftInfo's properties and methods here.

Available Arguments

To be able to support different types of projects, SwiftInfo provides customization options to some providers. Click on each of them to see their documentation!

πŸ‘Ά TargetCountProvider

πŸ’» LinesOfCodeProvider

πŸ“Š CodeCoverageProvider

Output

After successfully extracting data, you can call api.save(output: output) to have SwiftInfo add/update a json file in the {Infofile path}/SwiftInfo-output folder. It's important to add this file to version control after the running the tool as this is what SwiftInfo uses to compare new pieces of information.

SwiftInfo-Reader can be used to transform this output into a more visual static HTML page.

Tracking custom info

If you wish to track something that's not handled by the default providers, you can create your own provider by creating a struct that inherits from InfoProvider inside your Infofile. Here's a simple provider that tracks the number of files in a project where adding new files is bad:

struct FileCountProvider: InfoProvider {

    struct Args {
        let fromFolders: [String]
    }

    typealias Arguments = Args

    static let identifier = "file_count"
    let description = "Number of files"

    let fileCount: Int

    static func extract(fromApi api: SwiftInfo, args: Args?) throws -> FileCountProvider {
        let count = // get the number of files from the provided `args?.fromFolders`
        return FileCountProvider(fileCount: count)
    }

    // Given another instance of this provider, return a `Summary` that explains the difference between them.
    func summary(comparingWith other: FileCountProvider?, args: Args?) -> Summary {
        let prefix = "File Count"
        guard let other = other else {
            return Summary(text: prefix + ": \(fileCount)", style: .neutral)
        }
        guard count != other.count else {
            return Summary(text: prefix + ": Unchanged. (\(fileCount))", style: .neutral)
        }
        let modifier: String
        let style: Summary.Style
        if fileCount > other.fileCount {
            modifier = "*grew*"
            style = .negative
        } else {
            modifier = "was *reduced*"
            style = .positive
        }
        let difference = abs(other.fileCount - fileCount)
        let text = prefix + " \(modifier) by \(difference) (\(fileCount))"
        return Summary(text: text, style: style, numericValue: Float(fileCount), stringValue: "\(fileCount) files")
    }
}

Documentation of useful types and methods from SwiftInfoCore that you can use when building custom providers will be available soon.

If you end up creating a custom provider, consider submitting it here as a pull request to have it added as a default one!

Installation

Homebrew

To install SwiftInfo the first time, simply run these commands:

brew tap rockbruno/SwiftInfo https://github.com/rockbruno/SwiftInfo.git
brew install rockbruno/SwiftInfo/swiftinfo

To update to the newest version of SwiftInfo when you have an old version already installed run:

brew upgrade swiftinfo

CocoaPods

pod 'SwiftInfo'

Manual

Download the latest release and unzip the contents somewhere in your project's folder.

Swift Package Manager

SwiftPM is currently not supported due to the need of shipping additional files with the binary, which SwiftPM does not support. We might find a solution for this, but for now there's no way to use the tool with it.

License

SwiftInfo is released under the MIT license. See LICENSE for details.

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