cargo-toolchain

cargo-toolchain is a utility to get the currently active and default rustup toolchains.

It requires that rustup is installed.

Usage as a CLI

cargo install cargo-toolchain

cargo toolchain # prints the currently active cargo toolchain, e.g. 'stable'

cargo toolchain -d # prints the default toolchain for the directory

cargo toolchain -h # print help message

Usage as a Library

https://docs.rs/cargo-toolchain