Library/Sources/Internal/Tasks/RunProcessTask.swift

@@ -0,0 +1,75 @@
+import Foundation
+
+struct RunProcessTask {
+    
+    // MARK: Type aliases
+    
+    typealias Output = String
+    
+    // MARK: Properties
+    
+    private var process: Processable
+    
+    // MARK: Initialisers
+    
+    init(process: Processable) {
+        self.process = process
+    }
+    
+    // MARK: Functions
+    
+    @discardableResult
+    mutating func callAsFunction(
+        path: String, arguments: [String] = []
+    ) async throws (RunProcessError) -> Output {
+        process.executableURL = URL(at: path)
+        process.arguments = arguments
+        
+        let pipeError = Pipe()
+        let pipeOutput = Pipe()
+        
+        process.standardError = pipeError
+        process.standardOutput = pipeOutput
+        
+        async let streamOutput = pipeOutput.availableData.append()
+        async let streamError = pipeError.availableData.append()
+        
+        do {
+            try process.run()
+            
+            let dataOutput = await streamOutput
+            let dataError = await streamError
+            
+            guard dataError.isEmpty else {
+                guard let errorOutput = String(data: dataError, encoding: .utf8) else {
+                    throw RunProcessError.unexpected
+                }
+                
+                throw RunProcessError.output(errorOutput)
+            }
+            
+            guard let output = String(data: dataOutput, encoding: .utf8) else {
+                throw RunProcessError.unexpected
+            }
+            
+            return await withCheckedContinuation { continuation in
+                process.terminationHandler = { _ in
+                    continuation.resume(returning: output)
+                }
+            }
+        } catch let error as RunProcessError {
+            throw error
+        } catch {
+            throw RunProcessError.captured(error)
+        }
+    }
+    
+}
+
+// MARK: - Errors
+
+public enum RunProcessError: Error {
+    case captured(_ error: Error)
+    case output(_ output: String)
+    case unexpected
+}

Library/Sources/Public/Tasks/CreateRootFolderTask.swift

@@ -14,10 +14,7 @@ public struct CreateRootFolderTask {
     
     // MARK: Functions
     
-    public func callAsFunction(
-        name: String,
-        at location: URL? = nil
-    ) async throws -> URL {
+    public func callAsFunction(name: String, at location: URL? = nil) async throws -> URL {
         guard !name.isEmpty else {
             throw CreateRootFolderError.nameIsEmpty
         }