git-extract

#!/bin/bash
## extract files archived from git-compress
## TODO use tmp folder to support operation within a git repo
set -e
set -o pipefail

with_progress=0
filename=''

if [ "$1" == "-p" ] || [ "$1" == "--progress" ]; then
  with_progress=1
  filename="$2"
elif [ "$2" == "-p" ] || [ "$2" == "--progress" ]; then
  with_progress=1
  filename="$1"
else
  filename="$1"
fi
if [ ! -f "$filename" ]; then
  echo >&2 "File $filename not found!"
  exit 1
fi

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

if [ $with_progress == 1 ]; then
  echo "extracting $filename,"
  tar xz --checkpoint-action="echo=%T" -f "$filename"
  echo "extracted $filename,"
  echo "git checking-out,"
else
  tar xzf "$filename"
fi
git checkout .
rm -rf .git
echo "extraction done."