Expose derive macro behind feature

Cargo.lock

@@ -27,6 +27,7 @@ checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 name = "decodal"
 version = "0.1.1"
 dependencies = [
+ "decodal-derive",
  "regex",
 ]
 

README.md

@@ -22,17 +22,15 @@ decodal = "0.1"
 
 ## Derive support
 
-For embedded Rust applications, `decodal-derive` can generate a Decodal schema and typed decoder from a Rust struct.
+For embedded Rust applications, Decodal can generate a schema and typed decoder from a Rust struct with the `derive` feature.
 
 ```toml
 [dependencies]
-decodal = "0.1"
+decodal = { version = "0.1", features = ["derive"] }
-decodal-derive = "0.1"
 ```
 
 ```rust
-use decodal::{DecodalDecode, DecodalSchema, Engine};
+use decodal::{Decodal, DecodalDecode, DecodalSchema, Engine};
-use decodal_derive::Decodal;
 
 #[derive(Decodal)]
 struct Service {

crates/decodal-core/Cargo.toml

@@ -13,7 +13,9 @@ categories = ["config", "parser-implementations"]
 [features]
 default = ["std"]
 std = []
+derive = ["dep:decodal-derive"]
 regex = ["std", "dep:regex"]
 
 [dependencies]
+decodal-derive = { version = "0.1.1", path = "../decodal-derive", optional = true }
 regex = { version = "1.10", default-features = false, features = ["std", "unicode-perl"], optional = true }

crates/decodal-core/src/lib.rs

@@ -16,6 +16,8 @@ pub mod typed;
 
 pub use ast::{Ast, BinaryOp, CompareOp, Expr, ExprId, Field, Literal, Param};
 pub use constraints::normalize_constraints;
+#[cfg(feature = "derive")]
+pub use decodal_derive::Decodal;
 pub use diagnostic::{Diagnostic, DiagnosticKind, Result};
 pub use embedding::{HostField, HostValue};
 pub use eval::{Engine, format_diagnostic_with};

doc/manual/souce/design/embedding-api.md

@@ -89,15 +89,14 @@ This matches the runtime model used for Decodal source-defined schema objects.
 
 ## Typed Rust integration
 
-Hosts can use `decodal-derive` to keep a Rust struct, the Decodal schema, and the decoded result in sync.
+Hosts can enable the `derive` feature on `decodal` to keep a Rust struct, the Decodal schema, and the decoded result in sync.
 The derive implements two traits from the `decodal` crate:
 
 - `DecodalSchema`: builds a `HostValue` schema that can be passed to `Engine::bind_global`.
 - `DecodalDecode`: decodes materialized `Data` back into the Rust type.
 
 ```rust
-use decodal::{DecodalDecode, DecodalSchema, EmptyLoader, Engine};
+use decodal::{Decodal, DecodalDecode, DecodalSchema, EmptyLoader, Engine};
-use decodal_derive::Decodal;
 
 #[derive(Decodal)]
 struct Service {

doc/manual/souce/development.md

@@ -28,8 +28,8 @@ Workspace support crates such as `decodal-cli` and `decodal-wasm` are not publis
 The project is dual licensed as `MIT OR Apache-2.0`.
 
 ```sh
-cargo publish -p decodal
 cargo publish -p decodal-derive
+cargo publish -p decodal
 ```
 
 Before publishing, run:
@@ -38,8 +38,8 @@ Before publishing, run:
 cargo fmt --check
 cargo test
 cargo check -p decodal --no-default-features
-cargo publish -p decodal --dry-run
 cargo publish -p decodal-derive --dry-run
+cargo publish -p decodal --dry-run
 ```
 
 ## Web site and playground