Fix Code Generation with GYB

.github/workflows/danger-swift.yml

@@ -8,9 +8,10 @@ jobs:
   danger-scan:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v3
       - name: Danger
-        uses: danger/[email protected]
+        uses: danger/[email protected]
+        with:
+            args: --failOnErrors --no-publish-check
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          DANGER_GITHUB_API_TOKEN: ${{ secrets.DANGER_GITHUB_API_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/swiftlint.yml

@@ -3,11 +3,17 @@ name: SwiftLint
 on:
   pull_request:
     types: [ opened, synchronize ]
+    paths:
+      - '.github/workflows/swiftlint.yml'
+      - '.swiftlint.yml'
+      - '**/*.swift'
 
 jobs:
   SwiftLint:
-    runs-on: macos-latest
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
-      - name: Run SwiftLint
-        run: swiftlint lint --strict --reporter github-actions-logging
+      - uses: actions/checkout@v3
+      - name: GitHub Action for SwiftLint
+        uses: stanfordbdhg/action-swiftlint@v4
+        with:
+          args: --strict --reporter github-actions-logging

Package.swift

@@ -36,7 +36,9 @@ let package = Package(
             name: "danger-swift",
             url: "https://github.com/danger/swift.git",
             from: "3.5.0"
-        )
+        ),
+        .package(
+            url: "https://github.com/SimplyDanny/SwiftLintPlugins")
     ],
     targets: [
         .target(
@@ -46,7 +48,8 @@ let package = Package(
                 "Yams",
                 "XcodeProj",
                 .product(name: "ArgumentParser", package: "swift-argument-parser"),
-                "Stencil"
+                "Stencil",
+                "SwiftLintPlugins"
             ]
         ),
         .target(
@@ -57,7 +60,9 @@ let package = Package(
         ),
         .testTarget(
             name: "VariantsTests",
-            dependencies: ["Variants"]
+            dependencies: [
+                "Variants"
+            ]
         )
     ]
 )

README.md

@@ -43,6 +43,12 @@ This file is responsible for:
 
 ## Installation
 
+### Dependencies
+
+In order to generate the code from templates, Variants requires Python 2.7. We recommend configuring the python version using a version management tool such as Pyenv.
+
+For details on how to install and use it check the [Pyenv repo](https://github.com/pyenv/pyenv).
+
 ### On Github Actions CI
 
 See [Switching Variants on CI](docs/GITHUB_ACTION.md) for a better understanding and examples.

Sources/VariantsCore/Custom Types/Project/AndroidProject.swift

@@ -101,7 +101,7 @@ class AndroidProject: Project {
         try gradleFactory.createScript(with: configuration, variant: defaultVariant)
     }
 
-    // swiftlint:disable function_body_length
+    // swiftlint:disable:next function_body_length
     private func setupFastlane(with configuration: AndroidConfiguration, skip: Bool) {
         if skip {
             Logger.shared.logInfo("Skipped Fastlane setup", item: "")
@@ -183,7 +183,6 @@ class AndroidProject: Project {
             }
         }
     }
-    // swiftlint:enable function_body_length
 
     private func storeFastlaneParams(for variant: AndroidVariant, configuration: AndroidConfiguration) throws {
         var customProperties: [CustomProperty] = (variant.custom ?? []) + (configuration.custom ?? [])

Sources/VariantsCore/Custom Types/Project/iOSProject.swift

@@ -5,12 +5,12 @@
 //  Created by Balazs Toth
 //
 
+// swiftlint:disable type_name
+
 import Foundation
 import ArgumentParser
 import PathKit
 
-// swiftlint:disable type_name
-
 class iOSProject: Project {
     init(
         specHelper: SpecHelper,
@@ -140,7 +140,7 @@ class iOSProject: Project {
             }
     }
 
-    // swiftlint:disable function_body_length
+    // swiftlint:disable:next function_body_length
     private func setupFastlane(with configuration: iOSConfiguration, skip: Bool) {
         if skip {
             Logger.shared.logInfo("Skipped Fastlane setup", item: "")
@@ -225,7 +225,6 @@ class iOSProject: Project {
             }
         }
     }
-    // swiftlint:enable function_body_length
 
     private func storeFastlaneParams(_ properties: [CustomProperty]) throws {
         let fastlaneProperties = properties.filter { $0.destination == .fastlane }

Sources/VariantsCore/Factory/iOS/VariantsFileFactory.swift

@@ -30,7 +30,6 @@ class VariantsFileFactory {
                 "secrets": secrets,
                 "configurationValues": configurationValues
             ] as [String: Any]
-
             let environment = Environment(loader: FileSystemLoader(paths: [variantsGybTemplatePath.absolute()]))
             let rendered = try environment.renderTemplate(name: StaticPath.Template.variantsSwiftGybFileName,
                                                           context: context)
@@ -53,41 +52,68 @@ class VariantsFileFactory {
     }
 
     private func write(_ data: Data, using folder: Path = Path("/tmp/")) throws {
-        if folder.isDirectory, folder.exists {
-            let variantsGybFile = try folder.safeJoin(path: Path(StaticPath.Xcode.variantsGybFileName))
-
-            // Only proceed to write to file if such doesn't yet exist
-            // Or does exist and 'isWritable'
-            guard !variantsGybFile.exists
-                    || variantsGybFile.isWritable else {
-                throw TemplateDoesNotExist(templateNames: [folder.string])
-            }
-
-            // Write to file
-            try variantsGybFile.write(data)
-
-            if
-                try UtilsDirectory().path.exists,
-                let gybExecutablePath = try? UtilsDirectory().path.safeJoin(path: "gyb"),
-                let fileContent = try? variantsGybFile.read(),
-                fileContent == data {
-
-                try Bash(gybExecutablePath.absolute().description,
-                         arguments:
-                            "--line-directive",
-                            "",
-                            "-o",
-                            "Variants.swift",
-                            variantsGybFile.absolute().description
-                ).run()
-
-                logger.logInfo("⚙️  ", item: """
-                    '\(variantsGybFile.parent().abbreviate().string)/Variants.swift' has been generated with success
-                    """, color: .green)
-            }
-        } else {
+        guard folder.isDirectory, folder.exists else {
             throw TemplateDoesNotExist(templateNames: [folder.string])
         }
+
+        let variantsGybFile = try folder.safeJoin(path: Path(StaticPath.Xcode.variantsGybFileName))
+        // Only proceed to write to file if such doesn't yet exist
+        // Or does exist and 'isWritable'
+        guard !variantsGybFile.exists || variantsGybFile.isWritable else {
+            throw TemplateDoesNotExist(templateNames: [folder.string])
+        }
+
+        try variantsGybFile.write(data)
+        guard
+            try UtilsDirectory().path.exists,
+            let gybExecutablePath = try? UtilsDirectory().path.safeJoin(path: "gyb"),
+            let fileContent = try? variantsGybFile.read(),
+            fileContent == data
+        else { return }
+
+        let gybStdErr = try Bash(gybExecutablePath.absolute().description,
+                 arguments:
+                    "--line-directive",
+                    "",
+                    "-o",
+                    "Variants.swift",
+                    variantsGybFile.absolute().description
+        ).capture(stream: .stderr)
+        let variantsFilePath = "\(variantsGybFile.parent().abbreviate().string)/Variants.swift"
+        handleGybErrors(message: gybStdErr, variantsFilePath: variantsFilePath)
+        logger.logInfo("⚙️  ", item: "'\(variantsFilePath)' has been generated with success", color: .green)
+    }
+
+    private func handleGybErrors(message: String?, variantsFilePath: String) {
+        guard let message, !message.isEmpty else { return }
+
+        switch message {
+        case _ where message.contains("env: python2.7: No such file or directory"):
+            logger.logFatal(item:
+            """
+            We're unable to find a 'python2.7' executable.
+            Install 'python2.7' or ensure it's in your executables path and try running this Variants command again.
+            Tip:
+                * Install pyenv (brew install pyenv)
+                * Install python2.7 (pyenv install python2.7)
+                * Add "$(pyenv root)/shims" to your PATH
+            """)
+        case _ where message.contains("for chunk in chunks(encode(os.environ.get("):
+            logger.logFatal(item:
+            """
+            We're unable to create 'Variants.Secrets' in '\(variantsFilePath)'.
+            Ensure that custom config values whose `env: true` are actually environment variables.
+            """)
+        case _ where message.contains("pyenv: python2.7: command not found"):
+            logger.logFatal(item:
+            """
+            Looks like you have pyenv installed but the current configured version is not correct.
+            Please, select the latest build of python 2.7 as local version.
+            For example: `pyenv local 2.7`
+            """)
+        default:
+            logger.logFatal(item: message as Any)
+        }
     }
 
     let logger: Logger

Sources/VariantsCore/Helpers/Bash.swift

@@ -11,6 +11,11 @@ struct Bash {
     var command: String
     var arguments: [String]
 
+    enum Stream {
+        case stdout
+        case stderr
+    }
+
     init(_ command: String, arguments: String...) {
         self.command = command
         self.arguments = arguments
@@ -20,12 +25,12 @@ struct Bash {
         _ = try capture()
     }
 
-    func capture() throws -> String? {
+    func capture(stream: Stream = .stdout) throws -> String? {
         guard var bashCommand = try execute(command: "/bin/bash", arguments: ["-l", "-c", "which \(command)"]) else {
             throw RuntimeError("\(command) not found")
         }
         bashCommand = bashCommand.trimmingCharacters(in: NSCharacterSet.whitespacesAndNewlines)
-        if let output = try execute(command: bashCommand, arguments: arguments) {
+        if let output = try execute(command: bashCommand, arguments: arguments, stream: stream) {
             // `dropLast()` is required as the output always contains a new line (`\n`) at the end.
             return String(output.dropLast())
         }
@@ -34,11 +39,13 @@ struct Bash {
 
     // MARK: - Private
 
-    private func execute(command: String, arguments: [String] = []) throws -> String? {
+    private func execute(command: String, arguments: [String] = [], stream: Stream = .stdout) throws -> String? {
         let process = Process()
-        let pipe = Pipe()
+        let stdoutPipe = Pipe()
+        let stderrPipe = Pipe()
         process.arguments = arguments
-        process.standardOutput = pipe
+        process.standardOutput = stdoutPipe
+        process.standardError = stderrPipe
 
         if #available(OSX 10.13, *) {
             process.executableURL = URL(fileURLWithPath: command)
@@ -48,8 +55,15 @@ struct Bash {
             process.launch()
         }
 
-        let data = pipe.fileHandleForReading.readDataToEndOfFile()
-        let output = String(data: data, encoding: .utf8)
-        return output
+        switch stream {
+        case .stdout:
+            let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
+            let stdout = String(data: stdoutData, encoding: .utf8)
+            return stdout
+        case .stderr:
+            let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
+            let stderr = String(data: stderrData, encoding: .utf8)
+            return stderr
+        }
     }
 }

Sources/VariantsCore/Helpers/SpecHelper.swift

@@ -5,11 +5,11 @@
 //  Created by Arthur Alves
 //
 
+// swiftlint:disable type_name
+
 import Foundation
 import PathKit
 
-// swiftlint:disable type_name
-
 enum iOSProjectKey: String, CaseIterable {
     case project = "PROJECT"
     case target = "TARGET"

Sources/VariantsCore/Schemas/iOS/iOSConfiguration.swift

@@ -5,10 +5,10 @@
 //  Created by Arthur Alves
 //
 
-import Foundation
-
 // swiftlint:disable type_name
 
+import Foundation
+
 internal extension CodingUserInfoKey {
     static let bundleID = CodingUserInfoKey(rawValue: "bundle_id")!
 }

Sources/VariantsCore/Schemas/iOS/iOSSigning.swift

@@ -5,10 +5,10 @@
 //  Created by Arthur Alves
 //
 
-import Foundation
-
 // swiftlint:disable type_name
 
+import Foundation
+
 struct iOSSigning: Codable {
     let teamName: String?
     let teamID: String?

Sources/VariantsCore/Schemas/iOS/iOSTarget.swift

@@ -5,10 +5,10 @@
 //  Created by Arthur Alves
 //
 
-import Foundation
-
 // swiftlint:disable type_name
 
+import Foundation
+
 public typealias NamedTarget = (key: String, value: iOSTarget)
 
 public struct iOSTarget: Codable {

Sources/VariantsCore/Schemas/iOS/iOSVariant.swift

@@ -5,10 +5,10 @@
 //  Created by Arthur Alves
 //
 
-import Foundation
-
 // swiftlint:disable type_name
 
+import Foundation
+
 public struct iOSVariant: Variant {
     let name: String
     let versionName: String