Crate procenv_macro 

procenv_macro

Procedural macro implementation for the procenv crate.

This crate provides the #[derive(EnvConfig)] procedural macro that generates code for loading configuration from environment variables. It is a proc-macro crate and can only export procedural macros.

Note: Users should depend on the procenv crate, not this one directly. The procenv crate re-exports this macro along with runtime types.

Module Structure

• parse - Attribute parsing for #[env(...)] and #[env_config(...)]
• field - Field type processing and code generation strategies
• expand - Macro expansion orchestration and code generation

Generated Code

The macro generates the following methods on the annotated struct:

Method	Description
from_env()	Load from environment variables
from_env_with_sources()	Load with source attribution
from_config()	Load from files + env (requires file feature)
from_args()	Load from CLI + env (requires CLI attributes)
env_example()	Generate .env.example template

It also generates a custom Debug implementation that masks secret fields.

Derive Macros

EnvConfig

Derive macro for loading configuration from environment variables.