version.sh

#!/bin/bash

major() {
if IFS=. read -r major rest <version.txt || [ -n "$major" ]; then
  echo "$((major + 1)).0.0.$1" >"version.txt"
else
  echo "ERROR: Unable to read version number from version.txt" >&2
  exit 1
fi
}
minor() {
if IFS=. read -r major minor patch build <version.txt || [ -n "$major" ]; then
  echo "$major.$((minor + 1)).0.$1" >"version.txt"
else
  echo "ERROR: Unable to read version number from version.txt" >&2
  exit 1
fi
}
patch() {
if IFS=. read -r major minor patch build <version.txt || [ -n "$major" ]; then
  echo "$major.$minor.$((patch + 1)).$1" >"version.txt"
else
  echo "ERROR: Unable to read version number from version.txt" >&2
  exit 1
fi
}
update() {
echo "New version = $(<version.txt)"
git config --global push.default simple
git config -l
git add version.txt
git commit -m "Updating version.txt with latest version number."
version=$(<version.txt)
git tag -a "v${version}" -m "Released new version: v${version}"
git push origin "v${version}"
git push -f
}
case "$1" in
  major)
    major $2
    update
    ;;
  minor)
    minor $2
    update
    ;;
  patch)
    patch $2
    update
    ;;
  build)
    build $2
    update
    ;;
  *)
    echo "Usage: bash version.sh {major|minor|patch} build_number"
    exit 1
esac
exit 0