feat(tvix/eval): Add a proc-macro for defining builtins r/5263

Add a single new proc macro to a new proc-macro crate,
`tvix-eval-proc-macros` for defining an inline module containing nix
builtins, and automatically generating a function within that module
which returns a list of those builtins as `tvix_eval::value::Builtin`.

Change-Id: Ie4afae438914d2af93d15637151a49b4c68aa352
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7198
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: Adam Joseph <adam@westernsemico.com>
Tested-by: BuildkiteCI

1 files changed, 16 insertions, 0 deletions

diff --git a/tvix/eval/builtin-macros/Cargo.toml b/tvix/eval/builtin-macros/Cargo.toml
new file mode 100644
index 000000000000..3a35ea12a0c0
--- /dev/null
+++ b/tvix/eval/builtin-macros/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "tvix-eval-builtin-macros"
+version = "0.0.1"
+authors = [ "Griffin Smith <root@gws.fyi>" ]
+edition = "2021"
+
+[dependencies]
+syn = { version = "1.0.57", features = ["full", "parsing", "printing", "visit", "visit-mut", "extra-traits"] }
+quote = "1.0.8"
+proc-macro2 = "1"
+
+[lib]
+proc-macro = true
+
+[dev-dependencies]
+tvix-eval = { path = "../" }