Initial commit

Shared/ShellExecutor.swift

@@ -0,0 +1,74 @@
+//
+//  ShellExecutor.swift
+//  Mist
+//
+//  Created by Nindi Gill on 17/6/2022.
+//
+
+import Foundation
+
+/// Helper class used to execute shell commands.
+class ShellExecutor: NSObject {
+
+    static var shared: ShellExecutor = ShellExecutor()
+    private var process: Process = Process()
+
+    // swiftlint:disable large_tuple
+
+    /// Executes custom shell commands.
+    ///
+    /// - Parameters:
+    ///   - arguments:            An array of arguments to execute.
+    ///   - variables:            Optionally set custom environment variables.
+    ///   - currentDirectoryPath: Optionally set the current directory path
+    ///
+    /// - Throws: A `MistError` if the exit code is not zero.
+    ///
+    /// - Returns: The contents of standard output, standard error, and the termination status.
+    func execute(
+        _ arguments: [String],
+        environment variables: [String: String] = [:],
+        currentDirectoryPath: String? = nil
+    ) throws -> (terminationStatus: Int32, standardOutput: String?, standardError: String?) {
+        let outputPipe: Pipe = Pipe()
+        let errorPipe: Pipe = Pipe()
+        process = Process()
+        process.launchPath = "/usr/bin/env"
+        process.arguments = arguments
+        process.standardOutput = outputPipe
+        process.standardError = errorPipe
+
+        var environment: [String: String] = ProcessInfo.processInfo.environment
+
+        for (key, value) in variables {
+            environment[key] = value
+        }
+
+        process.environment = environment
+
+        if let currentDirectoryPath: String = currentDirectoryPath {
+            process.currentDirectoryPath = currentDirectoryPath
+        }
+
+        process.launch()
+        process.waitUntilExit()
+
+        let outputData: Data = outputPipe.fileHandleForReading.readDataToEndOfFile()
+        let standardOutput: String? = String(data: outputData, encoding: .utf8)
+        let errorData: Data = errorPipe.fileHandleForReading.readDataToEndOfFile()
+        let standardError: String? = String(data: errorData, encoding: .utf8)
+        let terminationStatus: Int32 = process.terminationStatus
+        return (terminationStatus: terminationStatus, standardOutput: standardOutput, standardError: (standardError ?? "").isEmpty ? nil : standardError)
+    }
+
+    // swiftlint:enable large_tuple
+
+    func terminate() {
+
+        guard process.isRunning else {
+            return
+        }
+
+        process.terminate()
+    }
+}