Split diesel_codegen into two crates.

Having the same crate for both has caused a ton of problems with
linking. I had hoped to just use cargo features for this, but it wasn't
working out that way.

`diesel_codegen` now only targets nightly. `diesel_codegen_syntex`
handles syntex separately (and also contains the common code between the
two crates). Neither crate includes the postgres feature by default.

How to migrate
--------------

If your Cargo.toml previously looked like this:

```rust
[build-dependencies]
diesel_codegen = "0.6.0"
```

it should change to

```rust
[build-dependencies]
diesel_codegen_syntex = { version = "0.7.0", features = ["postgres"] }
```

(You'll need to change the `extern crate` line in `build.rs`)

If your Cargo.toml previously looked like this:

```rust
[dependencies]
diesel_codegen = { version = "0.6.0", default-features = false, features = ["nightly", "postgres"] }
```

it should change to

```rust
[dependencies]
diesel_codegen = { version = "0.7.0", features = ["postgres"] }
```

I've had to split out the cargo features in our test suite, since Cargo
doesn't give me a way to say "turn on the
diesel_codegen_syntex/postgres" feature only if the `with-syntex`
and `postgres` features are on, and I don't want to have to build syntex
every time I run the tests against nightly.

.cargo/config

@@ -1 +1 @@
-paths = ["diesel"]
+paths = ["diesel", "diesel_codegen_syntex"]

.travis.yml

@@ -22,14 +22,14 @@ script:
   fi &&
   (cd diesel_cli && travis-cargo test -- --no-default-features --features "$BACKEND") &&
   if [[ "$TRAVIS_RUST_VERSION" == nightly* ]]; then
-    (cd diesel_codegen && travis-cargo test -- --no-default-features --features "nightly $BACKEND")
+    (cd diesel_codegen_syntex && travis-cargo test -- --no-default-features --features "$BACKEND")
   else
-    (cd diesel_codegen && travis-cargo test -- --no-default-features --features "with-syntex $BACKEND")
+    (cd diesel_codegen_syntex && travis-cargo test -- --no-default-features --features "with-syntex $BACKEND")
   fi &&
   if [[ "$TRAVIS_RUST_VERSION" == nightly* ]]; then
-    (cd diesel_tests && travis-cargo test -- --no-default-features --features "unstable $BACKEND")
+    (cd diesel_tests && travis-cargo test -- --no-default-features --features "unstable_$BACKEND")
   else
-    (cd diesel_tests && travis-cargo test -- --no-default-features --features "with-syntex $BACKEND")
+    (cd diesel_tests && travis-cargo test -- --no-default-features --features "stable_$BACKEND")
   fi &&
   if [[ "$TRAVIS_RUST_VERSION" == nightly* ]]; then
     (cd diesel_compile_tests && travis-cargo test)

CHANGELOG.md

@@ -31,6 +31,10 @@ for Rust libraries in [RFC #1105](https://github.com/rust-lang/rfcs/blob/master/
 * Diesel now targets `nightly-2016-07-07`. Future releases will update to a
   newer nightly version on the date that Rust releases.
 
+* `diesel_codegen` has been split into two crates. `diesel_codegen` and
+  `diesel_codegen_syntex`. See [this commit](FIXME COMMIT LINK HERE) for
+  migration information.
+
 * Most structs that implement `Queryable` will now also need
   `#[derive(Identifiable)]`.
 

bin/test

@@ -2,17 +2,17 @@
 set -e
 
 if [ "$1" == "integration" ] && [ "$2" == "sqlite" ]; then
-  (cd diesel_tests && DATABASE_URL=/tmp/test.db cargo test --features "unstable sqlite" --no-default-features)
+  (cd diesel_tests && DATABASE_URL=/tmp/test.db cargo test --features "unstable_sqlite" --no-default-features)
 elif [ "$1" == "integration" ]; then
-  (cd diesel_tests && cargo test --features "unstable postgres" --no-default-features)
+  (cd diesel_tests && cargo test --features "unstable_postgres" --no-default-features)
 elif [ "$1" == "compile" ]; then
   (cd diesel_compile_tests && cargo test)
 else
   (cd diesel && cargo test --features "unstable chrono sqlite")
   (cd diesel_cli && cargo test --features "postgres" --no-default-features)
   (cd diesel_cli && cargo test --features "sqlite" --no-default-features)
-  (cd diesel_codegen && cargo test --no-default-features --features "nightly postgres")
-  (cd diesel_tests && cargo test --features "unstable postgres" --no-default-features)
-  (cd diesel_tests && DATABASE_URL=/tmp/test.db cargo test --features "unstable sqlite" --no-default-features)
+  (cd diesel_codegen_syntex && cargo test --no-default-features --features "postgres")
+  (cd diesel_tests && cargo test --features "unstable_postgres" --no-default-features)
+  (cd diesel_tests && DATABASE_URL=/tmp/test.db cargo test --features "unstable_sqlite" --no-default-features)
   (cd diesel_compile_tests && cargo test)
 fi;

diesel_codegen/Cargo.toml

@@ -3,32 +3,18 @@ name = "diesel_codegen"
 version = "0.6.1"
 authors = ["Sean Griffin <sean@seantheprogrammer.com>"]
 license = "MIT OR Apache-2.0"
-build = "build.rs"
 description = "Annotations to remove boilerplate from Diesel"
 documentation = "https://github.com/diesel-rs/diesel/blob/master/diesel_codegen"
 homepage = "http://diesel.rs"
 repository = "https://github.com/diesel-rs/diesel/tree/master/diesel_codegen"
 keywords = ["orm", "database", "postgres", "sql", "codegen"]
 
-[build-dependencies]
-syntex = { version = ">= 0.37.0, < 0.39.0", optional = true }
-syntex_syntax = { version = ">= 0.37.0, < 0.39.0", optional = true }
-
 [dependencies]
-syntex = { version = ">= 0.37.0, < 0.39.0", optional = true }
-syntex_syntax = { version = ">= 0.37.0, < 0.39.0", optional = true }
-diesel = { git = "https://github.com/diesel-rs/diesel.git", default-features = false }
-
-[dev-dependencies]
-tempdir = "0.3.4"
+diesel_codegen_syntex = { path = "../diesel_codegen_syntex", default-features = false }
 
 [features]
-default = ["with-syntex", "postgres"]
-nightly = []
-with-syntex = ["syntex", "syntex_syntax"]
-postgres = ["diesel/postgres"]
-sqlite = ["diesel/sqlite"]
+postgres = ["diesel_codegen_syntex/postgres"]
+sqlite = ["diesel_codegen_syntex/sqlite"]
 
 [lib]
-name = "diesel_codegen"
-crate-type = ["rlib", "dylib"]
+plugin = true

diesel_codegen/src/lib.rs

@@ -1,48 +1,12 @@
-#![cfg_attr(not(feature = "with-syntex"), feature(rustc_private, plugin_registrar, quote))]
-#![deny(warnings)]
+#![feature(rustc_private, plugin_registrar)]
 
-#[macro_use] extern crate diesel;
-
-#[cfg(feature = "with-syntex")]
-extern crate syntex;
-
-#[cfg(feature = "with-syntex")]
-extern crate syntex_syntax as syntax;
-
-#[cfg(not(feature = "with-syntex"))]
+extern crate diesel_codegen_syntex;
 extern crate syntax;
-
-#[cfg(not(feature = "with-syntex"))]
 extern crate rustc_plugin;
 
-#[cfg(feature = "with-syntex")]
-include!(concat!(env!("OUT_DIR"), "/lib.rs"));
-
-#[cfg(not(feature = "with-syntex"))]
-include!("lib.in.rs");
-
-mod util;
-
-#[cfg(feature = "with-syntex")]
-pub fn register(reg: &mut syntex::Registry) {
-    reg.add_attr("feature(custom_derive)");
-    reg.add_attr("feature(custom_attribute)");
-
-    reg.add_decorator("derive_Queryable", queryable::expand_derive_queryable);
-    reg.add_decorator("derive_Identifiable", identifiable::expand_derive_identifiable);
-    reg.add_decorator("insertable_into", insertable::expand_insert);
-    reg.add_decorator("changeset_for", update::expand_changeset_for);
-    reg.add_decorator("has_many", associations::expand_has_many);
-    reg.add_decorator("belongs_to", associations::expand_belongs_to);
-    reg.add_macro("embed_migrations", migrations::expand_embed_migrations);
-    reg.add_macro("infer_table_from_schema", schema_inference::expand_load_table);
-    reg.add_macro("infer_schema", schema_inference::expand_infer_schema);
-
-    reg.add_post_expansion_pass(util::strip_attributes);
-}
+use diesel_codegen_syntex::*;
 
-#[cfg_attr(not(feature = "with-syntex"), plugin_registrar)]
-#[cfg(not(feature = "with-syntex"))]
+#[plugin_registrar]
 pub fn register(reg: &mut rustc_plugin::Registry) {
     use syntax::parse::token::intern;
     use syntax::ext::base::MultiDecorator;

diesel_codegen_syntex/Cargo.toml

@@ -0,0 +1,29 @@
+[package]
+name = "diesel_codegen_syntex"
+version = "0.6.1"
+authors = ["Sean Griffin <sean@seantheprogrammer.com>"]
+license = "MIT OR Apache-2.0"
+build = "build.rs"
+description = "Allows use of `diesel_codegen` with `syntex`"
+documentation = "https://github.com/diesel-rs/diesel/blob/master/diesel_codegen"
+homepage = "http://diesel.rs"
+repository = "https://github.com/diesel-rs/diesel/tree/master/diesel_codegen"
+keywords = ["orm", "database", "postgres", "sql", "codegen"]
+
+[build-dependencies]
+syntex = { version = ">= 0.37.0, < 0.39.0", optional = true }
+syntex_syntax = { version = ">= 0.37.0, < 0.39.0", optional = true }
+
+[dependencies]
+syntex = { version = ">= 0.37.0, < 0.39.0", optional = true }
+syntex_syntax = { version = ">= 0.37.0, < 0.39.0", optional = true }
+diesel = { git = "https://github.com/diesel-rs/diesel.git", default-features = false }
+
+[dev-dependencies]
+tempdir = "0.3.4"
+
+[features]
+default = ["with-syntex"]
+with-syntex = ["syntex", "syntex_syntax"]
+postgres = ["diesel/postgres"]
+sqlite = ["diesel/sqlite"]

diesel_codegen_syntex/src/lib.in.rs

@@ -0,0 +1,9 @@
+pub mod associations;
+mod attr;
+pub mod identifiable;
+pub mod insertable;
+pub mod migrations;
+mod model;
+pub mod queryable;
+pub mod schema_inference;
+pub mod update;