Bump git tag

bump.sh

#!/bin/bash

function log_error() {
  msg=$1
  echo $msg >&2
}

function bump() {
  target_version=$1

  if [ -z $target_version ]
  then
    log_error "No tag provided. Please provide a semver tag as the first argument."
    return 1
  fi

  local_changes=$(git diff-index --name-only HEAD)
  if [ ! -z $local_changes ]
  then
    log_error "Warning: You have unstaged changes. Please commit or stash them."
    return 1
  fi

  current_branch=$(git rev-parse --abbrev-ref HEAD)
  if [ ! $current_branch = "main" ]
  then
    log_error "Warning: Not on main branch. Please switch branches and try again."
    return 1
  fi

  #TODO check version format.

  last_tag=$(git describe --tags --abbrev=0 2> /dev/null)
  first_commit=$(git rev-list --max-parents=0 HEAD | tail -n 1)
  last_ref=${last_tag:-$first_commit}

  tag_body=$(git shortlog --no-merges ${last_ref}..HEAD)

  git tag --annotate $target_version --message="Changes:" --message="${tag_body}" --edit

  return 0
}

bump $@
exit