x.swift

func runProc(_ cmd: String, args: [String], envs: [String:String] = [:], quoteArgs: Bool = true, stderr: Bool = false, cd: String? = nil, read: ((String) -> ())? = nil) throws {
	var ienvs = [("PATH", pathFromShell),
	             ("HOME", ProcessInfo.processInfo.environment["HOME"]!),
	             ("LANG", "en_CA.UTF-8")]
	for e in envs {
		ienvs.append(e)
	}
	let cmdPath = File(cmd).path
	var newCmd: String
	if let cd = cd {
		newCmd = "cd '\(cd)' && '\(cmdPath)\'"
	} else {
		newCmd = "'\(cmdPath)\'"
	}
	
	for n in 1...args.count {
		if quoteArgs {
			newCmd.append(" \"${\(n)}\"")
		} else {
			newCmd.append(" ${\(n)}")
		}
	}
	let shell = "/bin/sh"
	let proc = try SysProcess(shell, args: ["--login", "-ci", newCmd, cmdPath] + args, env: ienvs)
	let out: File? = stderr ? proc.stderr : proc.stdout
	if let read = read {
		while true {
			do {
				guard let s = try out?.readSomeBytes(count: 1024) , s.count > 0 else {
					break
				}
				let str = UTF8Encoding.encode(bytes: s)
				read(str.replacingOccurrences(of: "sh: no job control in this shell\n", with: ""))
			} catch PerfectLib.PerfectError.fileError(let code, _) {
				if code != EINTR {
					break
				}
			}
		}
	}
	let res = try proc.wait(hang: true)
	if res != 0 {
		let s = try proc.stderr?.readString()
		throw PerfectError.systemError(Int32(res), s!.replacingOccurrences(of: "sh: no job control in this shell\n", with: ""))
	}
}