envparse

Parse environment variables

BSD-3-Clause licensed by Matvey Aksenov

Maintained by [email protected]

This version can be pinned in stack with:envparse-0.6.0@sha256:df4483a7cf9829349b65248e2d6d692a83da807ae2cc3908013d3787a8d17251,2849

Depends on 2 packages(full list with versions):

Used by 1 package in nightly-2025-05-28(full list with versions):

optparse-applicative, but for environment variables

See example/Main.hs for an executable example

As to why anyone would want to use environment to configure their applications, here’s what some folks think about it.

Changes

A PVP-compliant re-release of 0.5.2 with no changes. (I missed a breaking change back in 0.5.1.)

Added configurable maximum info block width (https://github.com/supki/envparse/pull/21).
Added instance (Field e a, ...) => Field e (Maybe a) for generic environment parsing. (https://github.com/supki/envparse/pull/16)

Added char.
Fixed masking parse errors with default values. (https://github.com/supki/envparse/issues/8)
Replaced keep with sensitive. All variables are kept in the environment after a successul parse except those wrapped in sensitive. (https://github.com/supki/envparse/issues/9)

Supported GHC 8.0.1.
On GHC 7.8 and newer, as a secutiry measure, all declared variables are unset by the end of a successful parse. If you want to keep the variable in the environment, use the keep modifier. (https://github.com/supki/envparse/pull/7)

Removed the unnecessary AsEmpty and AsUnset constraints on the error type in the flag and switch parsers.

Supported user-defined Reader errors. (https://github.com/supki/envparse/pull/4)
Widened the range of GHC versions to test the library with from 7.6–7.8 to 7.6–HEAD.