#!/bin/bash

set -e

# Function: EnsureRoot
# Ensures that commands are being executed as root.
function EnsureRoot {
  if (( EUID != 0 )); then
    echo "[X] Must run as root"
    exit 100
  fi
}

# Function: EchoBlanks
# Echo number of blank lines indicated by input
#
# Parameters:
# ${1} - The number of blank lines to echo
function EchoBlanks {
  local num_lines

  # Strip non-numbers from input
  num_lines="${1//[^0-9]/}"
  if [[ -z "${num_lines}" ]]; then
    num_lines=0
  fi

  if [[ "${num_lines}" -ne 0 ]]; then
    for ((i = 0; i < num_lines; i++)); do
      echo ""
    done
  fi
}

# Function: StatusEcho
# Echos out provided text in inverted colors so it stands out
#
# Parameters:
# ${1} - The text to send
# ${2} - The number of leading empty lines before the echo
# ${3} - The number of trailing empty lines after the echo
function StatusEcho {
  EchoBlanks "${2}"
  echo -e "\e[7m${1} \e[0m"
  EchoBlanks "${3}"
}

# Function: WarningEcho
# Echos out provided text as white letters on a red background so it stands out.
#
# Parameters:
# ${1} - The text to send
# ${2} - The number of leading empty lines before the echo
# ${3} - The number of trailing empty lines after the echo
function WarningEcho {
  EchoBlanks "${2}"
  echo -e "\e[97m\e[41m${1} \e[0m"
  EchoBlanks "${3}"
}

# Function: CyanEcho
# Echos out provided text as Light Cyan letters on a black background so it stands out.
#
# Parameters:
# ${1} - The text to send
# ${2} - The number of leading empty lines before the echo
# ${3} - The number of trailing empty lines after the echo
function CyanEcho {
  EchoBlanks "${2}"
  echo -e "\e[96m\e[40m${1} \e[0m"
  EchoBlanks "${3}"
}

# Function: pushd
# Overrides default pushd functionatlity to suppress console messages.
function pushd {
  command pushd "$@" >/dev/null
}

# Function: popd
# Overrides default popd functionatlity to suppress console messages.
function popd {
  command popd >/dev/null
}