bash utilities

environment

#!/usr/bin/env bash

# Utility functions for dealing with the environment

source "$(dirname ${BASH_SOURCE[0]})/sanity"

function environment::read {
  # @TODO: Check for original allexport setting and return back instead of assuming it's off
  set -o allexport

  for envfile in "$@"; do
    if [ -s "${envfile}" ]; then
      source "${envfile}"
    fi
  done

  set +o allexport
}

function environment::export {
  # This function requires an even number of arguments
  sanity::even_arguments "$@"

  # Loop through key/value pairs, setting key to value if it doesn't already exist
  while [[ $# -gt 0 ]]; do
    local key="$1"; shift
    local default="$1"; shift

    if [ -z "${!key+x}" ]; then
      export $key="${default}"
    fi
  done
}

function environment::export_with_file_default {
  # This function requires an even number of arguments
  sanity::even_arguments "$@"

  while [[ $# -gt 0 ]]; do
    local key="$1"; shift
    local filename="$1"; shift

    # Only set variable if not already set and the file exists
    if [ -s "${filename}" ] && [ -z "${!key+x}" ]; then
      export $key="${filename}"
    fi
  done
}

sanity

#!/usr/bin/env bash

# Utility functions for sanity checks

function sanity::even_arguments {
  if [ $(($#%2)) -ne 0 ]; then
    echo "Odd number of arguments provided to ${FUNCNAME[1]}! An even number is required."
    exit 1
  fi
}