#!/bin/bash

declaim () {
    echo
    echo ${*}
    echo "==============="
    echo
}

SCRIPT_DIR=$(cd $(dirname ${0}); pwd)

REPO_DIR=${SCRIPT_DIR}/simpleRepo

if [ ${#} -eq 1 ]; then
  REPO_DIR=${1}
elif [ ${#} -gt 1 ]; then
  exit
fi

declaim "Creating empty repository: ${REPO_DIR}"
rm -rf ${REPO_DIR}
mkdir -vp ${REPO_DIR}
cd ${REPO_DIR}

declaim "Initialising it as a git repository"
git init .

git config --local user.name "Gaius Julius Caesar"
git config --local user.email "gjcaesar@pontifexmaximus.rm"

declaim "Creating a text file"
cat <<EOF > information.md

# Test file

This is a file for demonstration purposes

EOF

declaim "Adding and commiting that text file. The first commit"
git add information.md
git commit -m "commit1"

declaim "Updating the text file"
echo "This is a second line of information." >> information.md
echo >> information.md

declaim "Adding and commiting that text file. The second commit"
git add information.md
git commit -m "commit2"

declaim "Updating the text file for the second time"
echo "This is a third line of information." >> information.md
echo >> information.md

declaim "Adding and commiting that text file. The third commit"
git add information.md
git commit -m "commit3"

declaim "Creating and checking out the Rel1 branch"
git checkout -b Rel1

declaim "Updating the text file on the Rel1 branch"
cat <<EOF >> information.md

# Rel1 information

This is more information added as part of Rel1

EOF

declaim "Adding and commiting that text file. The fourth commit"
git add information.md
git commit -m "commit4"

declaim "Updating the text file on the Rel1 branch again"
mv -v information.md{,.hold}
cat information.md.hold | sed 's/of Rel1$/of Rel1./' > information.md
rm information.md.hold

declaim "Adding and commiting that text file. The fifth commit"
git add information.md
git commit -m "commit5"

declaim "Creating and checking out the Rel2 branch"
git checkout master
git checkout -b Rel2

declaim "Updating the text file on the Rel2 branch"
mv information.md{,.hold}
cat <<EOF > information.md

# Rel2 information

This is more information added as part of Rel2

EOF
cat information.md.hold >> information.md
rm information.md.hold

declaim "Adding and commiting that text file. The sixth commit"
git add information.md
git commit -m "commit6"

declaim "Updating the text file on the Rel2 branch again"
mv information.md{,.hold}
cat information.md.hold | sed 's/of Rel2$/of Rel2./' > information.md
rm information.md.hold

declaim "Adding and commiting that text file. The seventh commit"
git add information.md
git commit -m "commit7"

declaim "Checking out master"
git checkout master

git log --oneline --graph --decorate --all