#!/usr/bin/env bash

if [ "$#" -ne 1 ]; then
    echo "exactly one argument required"
    exit 1
fi

mkdir -p preprocessed-shaders

preprocess_file() {
  input_file="shaders/$1"
  while IFS= read -r line || [ -n "$line" ]; do
    if [[ $line = \#include* ]]; then
        name=$( echo "$line" | cut -d'"' -f2)
        preprocess_file "$name"
    else
      echo -e "$line"
    fi
  done < "$input_file"
}

input_name="$1"
output_file="preprocessed-shaders/$input_name"

preprocess_file "$input_name" > "$output_file"