SwiftShell

#!/usr/bin/env swiftshell

import SwiftShell

do {
	// If there is an argument, try opening it as a file. Otherwise use standard input.
	let input = try main.arguments.first.map {try open($0)} ?? main.stdin

	input.lines().enumerated().forEach { (linenr,line) in 
		print(linenr+1, ":", line) 
	}

	// Add a newline at the end.
	print("")
} catch {
	exit(error)
}

public struct CustomContext: Context, CommandRunning {
	public var env: [String: String]
	public var currentdirectory: String
	public var stdin: ReadableStream
	public var stdout: WritableStream
	public var stderror: WritableStream
}

import SwiftShell
import Foundation

extension Dictionary where Key:Hashable {
	public func filterToDictionary <C: Collection> (keys: C) -> [Key:Value]
		where C.Iterator.Element == Key, C.IndexDistance == Int {

		var result = [Key:Value](minimumCapacity: keys.count)
		for key in keys { result[key] = self[key] }
		return result
	}
}

// Prepare an environment as close to a new OS X user account as possible.
var cleanctx = CustomContext(main)
let cleanenvvars = ["TERM_PROGRAM", "SHELL", "TERM", "TMPDIR", "Apple_PubSub_Socket_Render", "TERM_PROGRAM_VERSION", "TERM_SESSION_ID", "USER", "SSH_AUTH_SOCK", "__CF_USER_TEXT_ENCODING", "XPC_FLAGS", "XPC_SERVICE_NAME", "SHLVL", "HOME", "LOGNAME", "LC_CTYPE", "_"]
cleanctx.env = cleanctx.env.filterToDictionary(keys: cleanenvvars)
cleanctx.env["PATH"] = "/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"

// Create a temporary directory for testing.
cleanctx.currentdirectory = main.tempdirectory

main.stdout.print("everything is fine")
main.stderror.print("no wait, something went wrong ...")

let writefile = try open(forWriting: path) // WritableStream
writefile.print("1", 2, 3/5, separator: "+", terminator: "=")

writefile.write("Read my lips:")

writefile.close()

let readfile = try open(path) // ReadableStream
let contents = readfile.read()

while let text = main.stdin.readSome() {
	// do something with ‘text’...
}

for line in main.stdin.lines() {
	// ...
}

main.stdin.onOutput { stream in
	// ‘stream’ refers to main.stdin
}

let data = Data(...)
writer.write(data: data)
reader.readSomeData()
reader.readData() 

let result1 = run("/usr/bin/executable", "argument1", "argument2")
let result2 = run("executable", "argument1", "argument2")

/// Output from a `run` command.
public final class RunOutput {

	/// The error from running the command, if any.
	let error: CommandError?

	/// Standard output, trimmed for whitespace and newline if it is single-line.
	let stdout: String

	/// Standard error, trimmed for whitespace and newline if it is single-line.
	let stderror: String

	/// The exit code of the command. Anything but 0 means there was an error.
	let exitcode: Int

	/// Checks if the exit code is 0.
	let succeeded: Bool
}

let date = run("date", "-u").stdout
print("Today's date in UTC is " + date)

try runAndPrint("executable", "arg") 

let command = runAsync("cmd", "-n", 245).onCompletion { command in
	// be notified when the command is finished.
}
command.stdout.onOutput { stdout in 
	// be notified when the command produces output (only on macOS).	
}

// do something with ‘command’ while it is still running.

try command.finish() // wait for it to finish.

    public let stdout: ReadableStream
    public let stderror: ReadableStream

    /// Is the command still running?
    public var isRunning: Bool { get }

    /// Terminates the command by sending the SIGTERM signal.
    public func stop()

    /// Interrupts the command by sending the SIGINT signal.
    public func interrupt()

    /// Temporarily suspends a command. Call resume() to resume a suspended command.
    public func suspend() -> Bool

    /// Resumes a command previously suspended with suspend().
    public func resume() -> Bool

    /// Waits for this command to finish.
    public func finish() throws -> Self

    /// Waits for command to finish, then returns with exit code.
    public func exitcode() -> Int

    /// Waits for the command to finish, then returns why the command terminated.
    /// - returns: `.exited` if the command exited normally, otherwise `.uncaughtSignal`.
    public func terminationReason() -> Process.TerminationReason

    /// Takes a closure to be called when the command has finished.
    public func onCompletion(_ handler: @escaping (AsyncCommand) -> Void) -> Self

try runAndPrint("echo", "We are", 4, "arguments")
// echo "We are" 4 arguments

let array = ["But", "we", "are"]
try runAndPrint("echo", array, array.count + 2, "arguments")
// echo But we are 5 arguments

try runAndPrint(bash: "cmd1 arg1 | cmd2 > output.txt")

var file = try open(forWriting: "output.txt")
runAsync("cmd1", "arg1").stdout.runAsync("cmd2").stdout.write(to: &file)

let someCommand = runAsync("cmd", "-n", 245)
// ...
do {
	try someCommand.finish()
} catch let CommandError.returnedErrorCode(command, errorcode) {
	print("Command '\(command)' finished with exit code \(errorcode).")
}

} catch CommandError.inAccessibleExecutable(let path) {
	// ‘path’ is the full path to the executable
}

} catch {
	print(error)
}

} catch {
	exit(error)
}

// swift-tools-version:5.0
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
    name: "ProjectName",
    platforms: [.macOS(.v10_13)],
    dependencies: [
        // Dependencies declare other packages that this package depends on.
        .package(url: "https://github.com/kareman/SwiftShell", from: "5.1.0")
    ],
    targets: [
        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
        .target(
            name: "ProjectName",
            dependencies: ["SwiftShell"]),
    ]
)