Add existing git repo as a subdirectory of this git repo.

gistfile1.txt

# usage:
#   gitaddsubdir foo https://mygit.repo
#
function gitaddsubdir () {
  dirname=$1
  repo=$2
  git remote add -f $dirname $repo
  git checkout $dirname/master -b $dirname
  mkdir $dirname

  # let bash globmatch hidden files 
  shopt -s dotglob

  git mv -k ./* $dirname
  echo "The above line doesn't properly handle .gitignores, so those will cause the following to break:"

  echo git commit -m \"Moved this repo to a new subdirectory '$dirname'\"
  echo git merge -m \"Imported $repo into $dirname\" master
}