Preprocess (merge) C++ example

-- Mergefile
main.cpp

-- main.cpp
#include <iostream>
#include "lib/LinkedList/LinkedList.h"
using namespace std;
int main() {
  // Code here
}

-- lib/LinkedList/LinkedList.h
#ifndef LIST_H
#define LIST_H
#include "./LinkedNode.h"
template <typename ListNodeType>
class LinkedList {
  // Class here
}
#endif

-- lib/LinkedList/LinkedNode.h
#ifndef LINKED_NODE_H
#define LINKED_NODE_H
template <typename LinkedNodeType>
struct LinkedNode { 
  // Struct here
}; 
#endif

-- merge.sh
#!/usr/bin/env bash
mergefile="Mergefile"
outfile="merged_main.cpp"

merge="merge.js"
curl https://raw.githubusercontent.com/kshaa/single-c-file/master/single-c-file.js > $merge
node $merge $mergefile $outfile
rm $merge

-- merged_main.cpp
// Begining of include './merged_main.cpp'
#include <iostream>

// Begining of include './lib/LinkedList/LinkedList.h'

// Begining of include './lib/LinkedList/LinkedNode.h'
template <typename LinkedNodeType>
struct LinkedNode { 
  // Struct here
}; 
// End of include './lib/LinkedList/LinkedNode.h'

template <typename ListNodeType>
class LinkedList {
  // Class here
}
using namespace std;
// End of include './lib/LinkedList/LinkedList.h'

int main() {
  // Code here
}
// End of include './merged_main.cpp'