compare two strings in dot separated version format in Bash

vercomp

#!/bin/bash

# https://stackoverflow.com/questions/4023830/how-to-compare-two-strings-in-dot-separated-version-format-in-bash
vercomp() {

  [[ $1 == $2 ]] && return 0
  v1=$(echo "$1" | sed -e 's|-|.|g')
  v2=$(echo "$2" | sed -e 's|-|.|g')
  
  local IFS=.
  local i ver1=($1) ver2=($2)
  # fill empty fields in ver1 with zeros
  for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
  do
    ver1[i]=0
  done

  for ((i=0; i<${#ver1[@]}; i++))
  do
    if [[ -z ${ver2[i]} ]]
    then
      # fill empty fields in ver2 with zeros
      ver2[i]=0
    fi
    if ((10#${ver1[i]} > 10#${ver2[i]}))
    then
      return 1
    fi
    if ((10#${ver1[i]} < 10#${ver2[i]}))
    then
      return 2
    fi
  done
  return 0
}

testvercomp () {
  vercomp $1 $2
  case $? in
    0) op='=';;
    1) op='>';;
    2) op='<';;
  esac
  if [[ $op != $3 ]]
  then
    echo "FAIL: Expected '$3', Actual '$op', Arg1 '$1', Arg2 '$2'"
  else
    echo "Pass: '$1 $op $2'"
  fi
}