Merging one git repository into another repository

merge-repo-as-subdir.sh

#!/bin/bash

if [[ $# -lt 3 ]] ; then
   echo "Usage: merge-my-repos <sub_directory> <path_to_repo> <prefix_for_tags>"
   exit 1
fi

DIR=$1
REPO=$2
TAG_PREFIX=$3

shopt -s extglob

if [ -d "$DIR" ]; then
  echo "Specified Directory exits!"
  exit 1
fi

for old_tag in `git tag`
do
  git tag -d $old_tag
done


git remote add other $REPO
git fetch other --tags

for old_tag in `git tag`
do
  git tag "${TAG_PREFIX}${old_tag}" $old_tag
  git tag -d $old_tag
done

for branch in `git branch -r | grep -v HEAD | grep "other/" | cut -d '/' -f 2- `
do

  git checkout -b temporaryBranch other/$branch
  rm -rf $DIR
  mkdir $DIR
  mv ./!($DIR) $DIR
  mv ./.!(git|idea||.) $DIR

  git add .
  git commit -q -m "Moved all files in branch '$branch' to subdirectory '$DIR'"

  git branch -D $branch

  git checkout -t origin/$branch

  if [[ $? -ne 0 ]] ; then
      git branch $branch
      git checkout $branch
  else
      git merge temporaryBranch --allow-unrelated-histories --commit --no-edit
  fi

  git branch -D temporaryBranch

done

git checkout master

git remote remove other

git push --all -u

git push --tags