BASH logger that listen to DEBUG environment variable

logger.sh

#!/usr/bin/env bash
# shellcheck disable=SC2155,SC2034,SC2059

# get script directory
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

#
# Register debug logger functions that are controlled by DEBUG= environment variable
# Examples:
#   DEBUG=* - print all logs
#   DEBUG=*,-dependencies - print all logs except 'dependencies'
#   DEBUG=common,token - print logs for 'common' and 'token'
#
function logger() {
  #
  # Usage:
  #   source "$SCRIPT_DIR/logger.sh" && logger tag "$@"
  #   echoTag "print only if DEBUG=tag is set"
  #   printfTag "print only if DEBUG=tag is set %s" "something"
  #
  local tag=${1}
  local Suffix=${1^}

  # keep it disabled by default
  declare -g -A TAGS && TAGS+=([$tag]=0)

  # declare logger functions
  eval "$(
    cat <<EOF
    #
    # begin
    #
    function echo${Suffix}() {
      [[ "\${TAGS[$tag]}" == "1" ]] && builtin echo "\$@"
    }

    function printf${Suffix}() {
      [[ "\${TAGS[$tag]}" == "1" ]] && builtin printf "\$@"
    }

    function configDebug${Suffix}() {
      local args=("\$@")
      IFS="," read -r -a tags <<<\$(echo "\$DEBUG")
      [[ "\${args[*]}" =~ "--debug" ]] && TAGS+=([$tag]=1)
      [[ "\${tags[*]}" =~ "$tag" ]] && TAGS+=([$tag]=1)
      [[ "\${tags[*]}" =~ "*" ]] && TAGS+=([$tag]=1)
      [[ "\${tags[*]}" =~ "-$tag" ]] && TAGS+=([$tag]=0)
      # builtin echo "done! \${!TAGS[@]} \${TAGS[@]}"
    }
    #
    # end
    #
EOF
  )"

  # configure logger
  eval "configDebug${Suffix}" "$@"

  # dump created loggers
  [[ "$tag" != "common" ]] && eval "echoCommon \"${cl_grey}Logger tags  :\" \"\${!TAGS[@]}\" \"|\" \"\${TAGS[@]}\" \"${cl_reset}\"" 2>/dev/null
}

# register own logger
logger common "$@"

latest version in : https://github.com/OleksandrKucherenko/e-bash