bump_version.sh

#!/bin/bash

if [ -z $2 ]
then
  BRANCH=master
else
  BRANCH=$2
fi

git checkout $BRANCH
git pull

VERSION=`git tag --sort=v:refname | tail -n 1`

IFS='.'

read -a VERSION <<< "$VERSION"

MAJOR=${VERSION[0]}
MINOR=${VERSION[1]}
PATCH=${VERSION[2]}

function bumpMajor() {
  ((MAJOR++))
  MINOR=0
  PATCH=0
}

function bumpMinior() {
  ((MINOR++))
  PATCH=0
}

function bumpPatch() {
  ((PATCH++))
}

case "$1" in
  major)
    echo "Bumping major version."
    bumpMajor
    ;;
  minor)
    echo "Bumping minor version."
    bumpMinior
    ;;
  patch)
    echo "Bumping patch version."
    if [ "$PATCH" -eq 9 ]
    then
      bumpMinior
    else
      bumpPatch
    fi
    ;;
esac

IFS=''

NEXT_VERSION="$MAJOR.$MINOR.$PATCH"

echo $NEXT_VERSION

while true; do
  read -p "Do you want to bump the version ($NEXT_VERSION) ? (Yy/Nn): " YN
  echo $YN
  case $YN in
    [Yy]* ) echo "Tagging.."; git tag "$NEXT_VERSION" -m "Version $NEXT_VERSION"; break;;
    [Nn]* ) exit;;
  esac
done