#!/usr/bin/env bash
# reset environment variables that could interfere with normal usage
export GREP_OPTIONS=
# put all utility functions here

# make a temporary file
git_extra_mktemp() {
    mktemp -t "$(basename "$0")".XXXXXXX
}

git_extra_default_branch() {
    local default_branch
    default_branch=$(git config --get git-extras.default-branch)
    if [ -z "$default_branch" ]; then
        echo "master"
    else
        echo "$default_branch"
    fi
}
#
# check whether current directory is inside a git repository
#

is_git_repo() {
  git rev-parse --show-toplevel > /dev/null 2>&1
  result=$?
  if test $result != 0; then
    >&2 echo 'Not a git repo!'
    exit $result
  fi
}

is_git_repo
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
