#!/usr/bin/env swift;
/******************************************************************************
 * This program simply copies one file to another, line by line.
 * 
 * Copyright © 2020 Richard Lesh.  All rights reserved.
 *****************************************************************************/

import Foundation
import Utils

func copyTextFile(_ fromFilespec:String, _ toFilespec:String) throws -> Void {
	let ifh:StreamReader? = StreamReader(fromFilespec)
	FileManager.default.createFile(atPath: toFilespec, contents: nil)
	let ofh:FileHandle? = FileHandle(forWritingAtPath: toFilespec)
	if ifh == nil {
		throw RuntimeError("Problem opening input file!")
	}
	if ofh == nil {
		throw RuntimeError("Problem opening output file!")
	}
	var line:String?
	line = ifh!.getLine()
	while line != nil {
		ofh!.write(line!.data(using: .utf8)!);ofh!.write("\n".data(using: .utf8)!)
		line = ifh!.getLine()
	}
	ifh!.close()
	try ofh!.close()
}

// Begin Main
if CommandLine.arguments.count != 3 {
	print("Syntax: " + CommandLine.arguments[0] + " {fromFilespec} {toFilespec}")
	exit(1)
}
var fromFilespec:String = CommandLine.arguments[1]
var toFilespec:String = CommandLine.arguments[2]
do {
	try copyTextFile(fromFilespec, toFilespec)
} catch let ex as RuntimeError {
	print("Error: " + ex.localizedDescription)
}

exit(EXIT_SUCCESS)