Bash: Get and set specified variable in specified section of `.ini` file using `awk`

ini_file_variable_get.sh

#!/bin/bash

main() {
  local ini_file="${1}" && { shift || true; }
  local section_name="${1}" && { shift || true; }
  local variable_name="${1}" && { shift || true; }
  if [ -z "${ini_file}" ] || [ -z "${section_name}" ] || [ -z "${variable_name}" ]; then
    echo "Usage: ini_file_variable_get.sh <ini_file> <section_name> <variable_name> [is_error_if_section_is_not_found=1] [is_error_if_variable_is_not_found=1]" >&2
    return 1
  fi

  local is_error_if_section_is_not_found="${1:-1}" && { shift || true; }
  local is_error_if_variable_is_not_found="${1:-1}" && { shift || true; }

  awk -v section="${section_name}" -v variable="${variable_name}" -v error_on_section_not_found="${is_error_if_section_is_not_found}" -v error_on_variable_not_found="${is_error_if_variable_is_not_found}" '
  BEGIN {
    in_section = 0;
    section_found = 0;
    variable_found = 0;
  }
  $0 ~ "^\\[" section "\\]$" {
    in_section = 1;
    section_found = 1;
    next;
  }
  $0 ~ "^\\[" {
    in_section = 0;
  }
  in_section && $0 ~ "^" variable "[[:space:]]*=" {
    split($0, arr, "=");
    value = arr[2];
    gsub(/^[[:space:]]+|[[:space:]]+$/, "", value);
    print value;
    variable_found = 1;
    exit;
  }
  END {
    if (!section_found && error_on_section_not_found == 1) {
      print "Error: Section [" section "] not found." > "/dev/stderr";
      exit 1;
    }
    if (section_found && !variable_found && error_on_variable_not_found == 1) {
      print "Error: Variable " variable " not found in section [" section "]." > "/dev/stderr";
      exit 1;
    }
  }
  ' "${ini_file}" || return "$?"

  return 0
}

main "$@" || exit "$?"

ini_file_variable_set.sh

#!/bin/bash

main() {
  local ini_file="${1}" && { shift || true; }
  local section_name="${1}" && { shift || true; }
  local variable_name="${1}" && { shift || true; }
  local new_value="${1}" && { shift || true; }
  if [ -z "${ini_file}" ] || [ -z "${section_name}" ] || [ -z "${variable_name}" ]; then
    echo "Usage: ini_file_variable_set.sh <ini_file> <section_name> <variable_name> [new_value] [is_error_if_section_is_not_found=1] [is_error_if_variable_is_not_found=1]" >&2
    return 1
  fi

  local is_error_if_section_is_not_found="${1:-1}" && { shift || true; }
  local is_error_if_variable_is_not_found="${1:-1}" && { shift || true; }

  local temp_file
  temp_file="$(mktemp)" || return "$?"

  awk -v section="${section_name}" -v variable="${variable_name}" -v new_value="${new_value}" -v error_on_section_not_found="${is_error_if_section_is_not_found}" -v error_on_variable_not_found="${is_error_if_variable_is_not_found}" '
  BEGIN {
    in_section = 0;
    section_found = 0;
    variable_found = 0;
  }
  $0 ~ "^\\[" section "\\]$" {
    in_section = 1;
    section_found = 1;
    print $0;
    next;
  }
  $0 ~ "^\\[" {
    in_section = 0;
    print $0;
    next;
  }
  in_section && $0 ~ "^[#;]?[[:space:]]*" variable "[[:space:]]*=" {
    # Handle commented or uncommented variable
    # Also, keep spaces around "="
    match($0, "^[#;]?[[:space:]]*" variable "([[:space:]]*=[[:space:]]*)", arr);
    suffix = arr[1];

    # Print the updated variable without the comment
    print prefix variable suffix new_value;
    variable_found = 1;
    next;
  }
  {
    print $0;
  }
  END {
    if (!section_found && error_on_section_not_found == 1) {
      print "Error: Section [" section "] not found." > "/dev/stderr";
      exit 1;
    }
    if (section_found && !variable_found && error_on_variable_not_found == 1) {
      print "Error: Variable [" variable "] not found in section [" section "]." > "/dev/stderr";
      exit 1;
    }
    # If section was found but variable was not found, add the variable to the section
    if (section_found && !variable_found) {
      print variable "=" new_value;
    }
  }
  ' "${ini_file}" > "${temp_file}" || return "$?"

  # If we cannot move file - remove temp file
  mv "${temp_file}" "${ini_file}" || { local return_code="$?"; rm "${temp_file}"; return "${return_code}"; }

  return 0
}

main "$@" || exit "$?"