git-compress

#!/bin/bash
## use git to compress a single folder or file
## TODO use tmp folder to support operation within a git repo
set -e
set -o pipefail

with_progress=0
filename=''
dest=''

if [ "$1" == "-p" ] || [ "$1" == "--progress" ]; then
  with_progress=1
  filename="$2"
elif [ "$2" == "-p" ] || [ "$2" == "--progress" ]; then
  with_progress=1
  filename="$1"
else
  filename="$1"
fi
if [ "$filename" == "" ]; then
  filename='.'
else
  filename=$(echo "$filename" | sed 's,/$,,')
fi
if [ "$filename" == "." ]; then
  dest=$(basename "$PWD")
  dest="$dest.git.tar.gz"
else
  dest="$filename.git.tar.gz"
fi

if [ -d .git ]; then
  echo "Error: this directory is already a git repo"
  exit 1
fi

if [ -f "$dest" ]; then
  echo -n "File $dest already exist, overwrite? [y/N]: "; read line
  if [ "$line" != y ]; then
    exit 0
  fi
fi

git init
if [ $with_progress == 1 ]; then
  git add -v "$filename"
  git gc
  tar cz --checkpoint-action="echo=%T" -f "$dest" .git
else
  git add "$filename"
  git gc
  tar czf "$dest" .git
fi
rm -rf .git
echo "saved to $dest"