Chapter 21: cargo-gen/src, two verbs

One file with two verbs:

cargo-gen generate <out-dir> <version> <edition> <majors> <third-party/Cargo.toml> <meta.json>...
cargo-gen write <generated-dir>

generate runs inside the buck build (:manifests). It reads every target's JSON, groups targets into packages, and writes the tree of manifests the BUCK files imply: the root workspace with its members and [workspace.dependencies] (crates.io versions from third-party/Cargo.toml, pgrx at =0.19.2 with its major feature stripped, so the per-crate pgNN features choose it), and one Cargo.toml per package, a package's unit-test target adding its dev-dependencies. write runs outside it (:update) and copies that tree into the checkout that holds the current directory.

Try it. Read the header of main.rs, then compare the root Cargo.toml: its first four lines are the warning the tool writes at the top of every file it owns.

For the people who maintain it

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