cargo makedocs will parse your current working directory's Cargo.toml and Cargo.lock for dependencies, and only build documentation for the direct dependencies. This saves you from having to type cargo doc --no-deps -p <crate> ....
If you want to exclude one or more crates for being documented, simply pass -e <cratename> as many times as needed. Same goes in reverse for -i, which will document a crate even if it isn't part of your Cargo.toml.
The --open flag will open the documentation in your web browser(passes --open to cargo doc).
cargo-makedocs is available under the MIT license, see LICENSE for more details.