/*  Author: Regan Heath
    This code is public domain
*/
import std.file;
import std.stdio;

bool issep(char c) {return (c == '\\' || c == '/');}

version(Windows) const char[] SEP = "\\";
version(linux) const char[] SEP = "/";

char[] makePath(char[] path, char[] file)
{
	if (!issep(path[$-1]))
	{
		if (!issep(file[0]))
			return path ~ SEP ~ file;
	}
	else
	{
		if (issep(file[0]))
			file = file[1..$];
	}
		
	return path ~ file;
}

void copyDir(char[] src, char[] dst, bool overwrite = false, bool recurse = false)
{
	if (!isdir(src))
		throw new FileException("Source does not exist");
	
	if (!exists(dst)) mkdir(dst);
	else if (!overwrite)
		throw new FileException("Destination exists and overwrite not specified");

	bool processEntry(char[] name)
	{
		if (isdir(makePath(src,name)))
		{
			if (!recurse) return true; //skip
			copyDir(makePath(src,name), makePath(dst,name), overwrite, true);
			return true;
		}
		copy(makePath(src,name), makePath(dst,name));
		return true;
	}

	listdir(src, &processEntry);
}

void main(char[][] argv)
{
	if (argv.length < 5) throw new Exception("Usage: copyDir src dst overwrite recurse");
	copyDir(argv[1],argv[2],argv[3]=="true",argv[4]=="true");
}