Bash semver compare

semver_compare.sh

# Used as reference: https://gist.github.com/maxrimue/ca69ee78081645e1ef62
platform::semver_compare() {
  normalize_ver() {
    echo "${${1//./ }//v/}"
  }

  compare_ver() {
    [[ $1 -lt $2 ]] && echo -1 && return
    [[ $1 -gt $2 ]] && echo 1 && return

    echo 0
  }

  v1="$(normalize_ver $1)"
  v2="$(normalize_ver $2)"

  major1="$(echo $v1 | awk '{print $1}')"
  major2="$(echo $v2 | awk '{print $1}')"

  minor1="$(echo $v1 | awk '{print $2}')"
  minor2="$(echo $v2 | awk '{print $2}')"

  patch1="$(echo $v1 | awk '{print $3}')"
  patch2="$(echo $v2 | awk '{print $3}')"

  compare_major="$(compare_ver $major1 $major2)"
  compare_minor="$(compare_ver $minor1 $minor2)"
  compare_patch="$(compare_ver $patch1 $patch2)"

  if [[ $compare_major -ne 0 ]]; then
    echo "$compare_major"
  elif [[ $compare_minor -ne 0 ]]; then
    echo "$compare_minor"
  else
    echo "$compare_patch"
  fi
}