Module from_env

FromEnv, FromEnvVar traits and related utilities.

Structs

EnvItemInfo

Details about an environment variable. This is used to generate documentation for the environment variables and by the FromEnv trait to check if necessary environment variables are present.

Enums

FromEnvErr

Error type for loading from the environment. See the FromEnv trait for more information.

Traits

FromEnv

Trait for loading from the environment.

FromEnvVar

Trait for loading primitives from the environment. These are simple types that should correspond to a single environment variable. It has been implemented for common integer types, String, url::Url, tracing::Level, and std::time::Duration.

Functions

parse_env_if_present

Convenience function for parsing a value from the environment, if present and non-empty.

Derive Macros

FromEnv

The derive(FromEnv) macro.