simple script to bump semantically versioned repos

bump

#!/usr/bin/env bash

while [[ -n "$1" ]] ; do
  case "$1" in
    --minor)
	MINOR=true
	;;
    --major)
	MAJOR=true
	;;
     --help)
 	echo "Usage: bump [--major|--minor]"
	exit 1
        ;;
     *)
	echo "error: unknown arg" && exit 1 ;;
  esac
shift
done

TAGS=$(git ls-remote --tags origin | awk '{ print $2 }' | sed 's|refs/tags/||' | sort -t "." -V)
LAST=$(echo "$TAGS" | tac - | head -n 1)
echo "last tag: $LAST"

tag(){
echo "new tag: $VERSION"
git tag $VERSION
git push --tags
}

if [[ -z "$LAST" ]] ; then
  echo "no tag"
  VERSION="v0.0.1"
  tag
  exit 0
fi

if [[ "$MINOR" == "true" ]] ; then
  PREFIX=$(echo "$LAST" | sed 's/^\(.*\.\)\(.*\)\.\(.*\)$/\1/')
  MINOR=$(echo "$LAST" | sed 's/^\(.*\.\)\(.*\)\.\(.*\)$/\2/')
  INCREMENTED=$(expr $(($MINOR + 1)))
  VERSION=$(echo "${PREFIX}${INCREMENTED}.0")
elif [[ "$MAJOR" == "true" ]] ; then
  MAJOR=$(echo "$LAST" | sed 's/^v\(.*\)\..*\..*$/\1/')
  INCREMENTED=$(expr $(($MAJOR + 1)))
  VERSION=$(echo "v${INCREMENTED}.0.0")
else
  PREFIX=$(echo "$LAST" | sed 's/^\(.*\..*\.\)\(.*\)$/\1/')
  LATEST=$(echo "$LAST" | sed 's/^\(.*\..*\.\)\(.*\)$/\2/')
  INCREMENTED=$(expr $(($LATEST + 1)))
  VERSION=$(echo "${PREFIX}${INCREMENTED}")
fi

tag