docker-minecraft-server/minecraft-server/start-utils

#!/bin/bash

function isURL {
  local value=$1

  if [[ ${value:0:8} == "https://" || ${value:0:7} = "http://" ]]; then
    return 0
  else
    return 1
  fi
}

function isTrue {
  local value=${1,,}

  result=

  case ${value} in
    true|on)
      result=0
      ;;
    *)
      result=1
      ;;
  esac

  return ${result}
}

function isDebugging {
  if [[ ${DEBUG^^} = TRUE ]]; then
    return 0
  else
    return 1
  fi
}

function debug {
  if isDebugging; then
    echo "DEBUG: $*"
  fi
}