Scaffold v1.0.0

Sources/EmbedderTool/CommandLineInvocation.swift

@@ -0,0 +1,29 @@
+import Foundation
+
+struct CommandLineInvocation {
+    let sourceDirectory: URL
+    let outputFile: URL
+}
+
+extension CommandLineInvocation {
+    static func parse(_ arguments: [String]) throws -> CommandLineInvocation {
+        guard arguments.count == 3 else {
+            throw CommandLineInvocationError.wrongNumberOfArguments(received: arguments.count - 1)
+        }
+        return CommandLineInvocation(
+            sourceDirectory: URL(fileURLWithPath: arguments[1]),
+            outputFile: URL(fileURLWithPath: arguments[2])
+        )
+    }
+}
+
+enum CommandLineInvocationError: Error, CustomStringConvertible {
+    case wrongNumberOfArguments(received: Int)
+
+    var description: String {
+        switch self {
+        case .wrongNumberOfArguments(let received):
+            return "expected 2 arguments (source directory, output file); received \(received)"
+        }
+    }
+}