cabal-version: 2.4 name: from-env version: 0.1.0.0 synopsis: Provides a generic way to construct values from environment variables. description: . This package exposes a class `FromEnv` that works with `GHC.Generics` to provide a generic way to construct values from environment variables. . In many applications you'll have a configuration object holding a connection string to your database, the url of an S3 bucket, you name it. It can be tedious to have to construct this configuration object manually. With this package, you just derive `Generic` and then create an instance of `FromEnv` for your configuration type and you're done. Just call `fromEnv` and you got your configuration. . > import System.Environment.FromEnv > import GHC.Generics > newtype Config = Config { configS3BucketUrl :: String } deriving Generic > instance FromEnv Config > config <- fromEnv . The default behaviour is to convert field names like `configS3BucketUrl` into environment variables like `CONFIG_S3_BUCKET_URL`, but it can be overriden by providing a custom instance of `FromEnv`. bug-reports: https://github.com/aloussase/from-env/issues license: MIT author: Alexander Goussas maintainer: goussasalexander@gmail.com copyright: Alexander Goussas 2023 category: Configuration extra-source-files: README.md source-repository head type: git location: https://github.com/aloussase/from-env.git library exposed-modules: System.Environment.FromEnv System.Environment.FromEnv.TryParse ghc-options: -Wall -- other-modules: build-depends: , base ^>=4.16.4.0 , casing >=0.1.4 && <0.2 , text >=1.2.5 && <1.3 hs-source-dirs: src default-language: Haskell2010 test-suite from-env-test-suite type: exitcode-stdio-1.0 ghc-options: -Wall hs-source-dirs: test main-is: Spec.hs other-modules: System.Environment.FromEnvSpec build-depends: , base ^>=4.16.4.0 , from-env , hspec build-tool-depends: hspec-discover:hspec-discover default-language: Haskell2010