#!/usr/bin/env bash
set -euo pipefail

PROGRAM=$0
CURRENT_FILENAME=""
DESTINATION_FILENAME=""

function usage()
{
    echo 1>&2 "USAGE: ${PROGRAM} CURRENT_FILENAME DESTINATION_FILENAME"
}

while [[ $# -gt 0 ]]
do
  key="$1"

  if [[ "$CURRENT_FILENAME" == "" ]]; then
      CURRENT_FILENAME=$key
  elif [[ "$DESTINATION_FILENAME" == "" ]]; then
      DESTINATION_FILENAME=$key
  else
      usage
      exit 30  # Error during arguments parsing
  fi
  shift  # past argument or value
done

if [[ "$DESTINATION_FILENAME" == "" ]]; then
    usage
    exit 20  # Missing arguments CURRENT_FILENAME
elif [[ "$CURRENT_FILENAME" == "" ]]; then
    usage
    exit 10  # Missing arguments CURRENT_FILENAME
else
    echo "Coping $CURRENT_FILENAME into $DESTINATION_FILENAME"
    cp -r "${CURRENT_FILENAME}" "${DESTINATION_FILENAME}"

    git add "$DESTINATION_FILENAME"
    git commit -m "Duplicate ${CURRENT_FILENAME} history in ${DESTINATION_FILENAME} history." -n
fi