//
//  Shell.swift
//  
//
//  Created by Thibaut Schmitt on 22/12/2021.
//

import Foundation

public class Shell {
    
    public static var environment: [String: String] {
        ProcessInfo.processInfo.environment
    }

    @discardableResult
    public static func shell(
        launchPath: String = "/usr/bin/env",
        _ args: [String]
    ) -> (terminationStatus: Int32, output: String?) {
        #if os(macOS)
        let task = Process()
        task.launchPath = launchPath
        task.arguments = args
        
        var currentEnv = ProcessInfo.processInfo.environment
        for (key, value) in environment {
            currentEnv[key] = value
        }
        task.environment = currentEnv
        
        let pipe = Pipe()
        task.standardOutput = pipe
        task.launch()
        task.waitUntilExit()
        
        let data = pipe.fileHandleForReading.readDataToEndOfFile()
        
        guard let output: String = String(data: data, encoding: .utf8) else {
            return (terminationStatus: task.terminationStatus, output: nil)
        }
        
        return (terminationStatus: task.terminationStatus, output: output)
        #else
        fatalError("Shell is only available on Mac")
        #endif
    }
}