[WIP] Add support for including single Swift files

Sources/BeakCore/BeakFile.swift

@@ -3,10 +3,21 @@ import PathKit
 import SourceKittenFramework
 
 public struct BeakFile: Equatable {
-
     public let contents: String
-    public let dependencies: [Dependency]
-    public let functions: [Function]
+    public let includedFiles: [BeakFile]
+
+    private let ownDependencies: [Dependency]
+    private let ownFunctions: [Function]
+
+    public var dependencies: [Dependency] {
+        let includedFilesDependencies: [Dependency] = includedFiles.reduce([]) { $0 + $1.dependencies }
+        return includedFilesDependencies + ownDependencies
+    }
+
+    public var functions: [Function] {
+        let includedFilesFunctions: [Function] = includedFiles.reduce([]) { $0 + $1.functions }
+        return includedFilesFunctions + ownFunctions
+    }
 
     public init(path: Path) throws {
         guard path.exists else {
@@ -22,20 +33,29 @@ public struct BeakFile: Equatable {
 
     public init(contents: String) throws {
         self.contents = contents
-        functions = try SwiftParser.parseFunctions(file: contents)
-        dependencies = contents
+        ownFunctions = try SwiftParser.parseFunctions(file: contents)
+        ownDependencies = contents
             .split(separator: "\n")
             .map(String.init)
             .filter { $0.hasPrefix("// beak:") }
             .map { $0.replacingOccurrences(of: "// beak:", with: "") }
             .map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }
             .filter { !$0.isEmpty }
             .map(Dependency.init)
+        includedFiles = contents
+            .split(separator: "\n")
+            .map(String.init)
+            .filter { $0.hasPrefix("// include:") }
+            .map { $0.replacingOccurrences(of: "// include:", with: "") }
+            .map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }
+            .filter { $0.hasSuffix(".swift") }
+            .compactMap { try? BeakFile(path: Path($0)) }
     }
 
-    public init(contents: String, dependencies: [Dependency], functions: [Function]) {
+    public init(contents: String, dependencies: [Dependency], functions: [Function], includedFiles: [BeakFile]) {
         self.contents = contents
-        self.dependencies = dependencies
-        self.functions = functions
+        self.ownDependencies = dependencies
+        self.ownFunctions = functions
+        self.includedFiles = includedFiles
     }
 }

Tests/BeakTests/BeakTests.swift

@@ -214,7 +214,8 @@ class BeakTests: XCTestCase {
                             throwing: true,
                             docsDescription: "Releases a new version of Beak"
                         ),
-                    ]
+                    ],
+                    includedFiles: []
                 )
 
                 try expect(beakFile) == expectedBeakFile
@@ -277,7 +278,7 @@ class BeakTests: XCTestCase {
                     .init(name: "repo3", package: "https://github.com/name2/repo3.git", requirement: ".exact(\"4.3.0\")", libraries: ["repo3"]),
                 ]
 
-                let beakFile = BeakFile(contents: "", dependencies: dependencies, functions: [])
+                let beakFile = BeakFile(contents: "", dependencies: dependencies, functions: [], includedFiles: [])
                 let package = PackageManager.createPackage(name: "Test", beakFile: beakFile)
 
                 let expectedPackage = """