dotenvy-workspace-example

Minimal example to investigate dotenvy #74

• crate a uses dotenvy_macro. It reproduces the error.
• crate b uses dotenvy. It shows a solution.

Issue

The problem is that the user expects the .env inside the crate folder to be read. Instead, the workspace .env is being read.

Diagnosis

dotenvy::dotenv and the dotenvy! macro both read from std::env::current_dir.

If the user runs cargo run --bin b from the workspace root, then the current dir is the workspace root.

Solution

To get the crate dir, we can use CARGO_MANIFEST_DIR and dotenvy::from_path.

let manifest_dir = std::env::var("CARGO_MANIFEST_DIR")?;
dotenvy::from_path(format!("{manifest_dir}/.env"))?;

Will this be adopted?

No, because not all users use Cargo. Some just use the rustc compiler.

However, an example will be added to the repo.