BSD-3-Clause licensed and maintained by Pat Brisbin

Module documentation for 0.2.1.0

This version can be pinned in stack with:load-env-0.2.1.0@sha256:17628d397cf7ba6af9bf103c2c3592bb246e2ad58bd019cc5071c654887b1083,1866

load-env

Build Status

This is effectively a port of dotenv, whose README explains it best:

Storing configuration in the environment is one of the tenets of a twelve-factor app. Anything that is likely to change between deployment environments–such as resource handles for databases or credentials for external services–should be extracted from the code into environment variables.

But it is not always practical to set environment variables on development machines or continuous integration servers where multiple projects are run. dotenv loads variables from a .env file into ENV when the environment is bootstrapped.

This library exposes functions for doing just that.

Usage

import LoadEnv
import System.Environment (lookupEnv)

main :: IO ()
main = do
    loadEnv

    print =<< lookupEnv "FOO"
% cat .env
FOO=bar
% runhaskell main.hs
Just "bar"

Development & Test

stack setup
stack build --pedantic --test

CHANGELOG | LICENSE

Changes

Unreleased

None

v0.2.1.0

  • Don’t override values already set in the environment

    Given a hypothetical program load-env, which uses one of our loadEnv functions on stdin:

    Previously,

    FOO=bar load-env <<EOM
    FOO=bat
    EOM
    

    would override FOO to bat when load-env ran. But now, it will see FOO is already bar and leave it.

    This is better behavior under the assumption that a .env file is meant to specify defaults in the case of nothing explicit. When there are explicit values in the environment, it’s most likely that our user indeed wants them respected.

v0.2.0.2

v0.2.0.1

  • Packaging and documentation updates

v0.2.0.0

  • Traverse up parent directories to find the .env file

v0.1.2

  • Packaging updates

v0.1.1

  • Parse variables names more strictly

v0.1.0

  • Don’t fail on an empty file
  • Ignore any invalid lines, not specifically things that look like comments

v0.0.4

  • Don’t throw an exception if the .env file is missing

v0.0.3

  • Variable names can contain underscores

v0.0.2

  • Drop support for GHC < 7.8

v0.0.1

Initial release.

Used by 1 package in lts-14.13(full list with versions):
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