proto-build: split into a library and binary#268
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Previously, `proto-build` was a binary-only crate with all codegen modules and the driver logic living in `main.rs`. With this commit, the codegen modules move into a new library target so they can be reused by other crates, while `main.rs` retains the driver entry point and reaches the modules through the `proto_build` lib. The library also re-exports the upstream codegen crates `pbjson_build`, `prost`, `prost_types`, `protox`, and `tonic_prost_build`, so downstream consumers can drive codegen without depending on them directly. `DescriptorGraph::new`, `generate_accessors`, and `generate_field_info` are now `pub` rather than `pub(crate)` so the binary can call them across the library boundary.
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Previously,
proto-buildwas a binary-only crate with all codegen modules and the driver logic living inmain.rs. With this commit, the codegen modules move into a new library target so they can be reused by other crates, whilemain.rsretains the driver entry point and reaches the modules through theproto_buildlib.The library also re-exports the upstream codegen crates
pbjson_build,prost,prost_types,protox, andtonic_prost_build, so downstream consumers can drive codegen without depending on them directly.DescriptorGraph::new,generate_accessors, andgenerate_field_infoare nowpubrather thanpub(crate)so the binary can call them across the library boundary.