sh.sh

#!/usr/bin/bash

if [ -n "$sh_isSourced" ] || [ -n "$sh_initialOptions" ]; then return; fi

. "validate.sh" && validate_shellVersion

declare -gri sh_isSourced=1

################################################################################
# Options ######################################################################
sh_saveOptions() {
  . "log.sh"

  local add_readonly=0
  local varName=""

  local cmd_exists=("declare" "-gp")
  local cmd_create=("declare" "-ga")

  while (( $# > 0 )); do
    case "$1" in
      "-r"|"--add-readonly")
        add_readonly=1
        shift;;
      *)
        varName="$1"
        shift

        break;;
    esac
  done

  (( $# != 0 )) && log_fatal -f "Invalid argument: ${1}"

  [[ -z "$varName" || ! "$varName" =~ ^[a-zA-Z_][a-zA-Z0-9_]*$ ]] && \
    log_fatal -f "Invalid variable name: ${varName}"

  "${cmd_exists[@]}" "$varName" &>/dev/null && unset "$varName"
  "${cmd_create[@]}" "$varName"
  read -rs -a "$varName" <<< "$(set +o | sed -E ':a;N;$!ba;s/(set |\nset)//g')"

  (( add_readonly )) && "${cmd_create[@]}" -r "$varName"

  return 0
} ##############################################################################
sh_restoreOptions() {
  . "log.sh"

  local varName="$1"

  local options=()

  [[ -z "$varName" || ! "$varName" =~ ^[a-zA-Z_][a-zA-Z0-9_]*$ ]] && \
    log_fatal -f "Invalid variable name: ${varName}"
  ! ( declare -p "$varName" 2>/dev/null | grep -qE '^declare \-a' ) && \
    log_fatal -f "Invalid variable: ${varName}"

  varName+="[@]"
  options=("${!varName}")
  (( ${#options[@]} == 0 || ${#options[@]} % 2 != 0 )) && \
    log_fatal -f "Invalid options: ${options[@]}"

  for (( i = 0; i < ${#options[@]}; i = i + 2 )); do
    set "${options[i]}" "${options[i + 1]}"
  done

  return 0
} ##############################################################################
################################################################################

sh_saveOptions -r sh_initialOptions