Refactor Rust toolchain management

- Reuse system installed rustup
- Reuse installed rustup across hooks
- Reuse installed Rust toolchains across hooks

Author: j178

crates/prek-consts/src/env_vars.rs

@@ -34,7 +34,7 @@ impl EnvVars {
         "PREK_INTERNAL__RUN_ORIGINAL_PRE_COMMIT";
     pub const PREK_INTERNAL__GO_BINARY_NAME: &'static str = "PREK_INTERNAL__GO_BINARY_NAME";
     pub const PREK_INTERNAL__NODE_BINARY_NAME: &'static str = "PREK_INTERNAL__NODE_BINARY_NAME";
-    pub const PREK_INTERNAL__RUST_BINARY_NAME: &'static str = "PREK_INTERNAL__RUST_BINARY_NAME";
+    pub const PREK_INTERNAL__RUSTUP_BINARY_NAME: &'static str = "PREK_INTERNAL__RUST_BINARY_NAME";
     pub const PREK_GENERATE: &'static str = "PREK_GENERATE";
 
     // Python & uv related

docs/todo.md

@@ -15,6 +15,7 @@ The original pre-commit supports hooks written in 10+ languages. The table below
 | python ⭐ | ✅ Supported | — | `prek` supports automatic version management of Python toolchains. |
 | node | ✅ Supported | — | |
 | golang | ✅ Supported | — | |
+| rust | ✅ Supported | — | |
 | lua | ✅ Supported | — | |
 | system | ✅ Supported | — | |
 | script | ✅ Supported | — | |
@@ -24,7 +25,6 @@ The original pre-commit supports hooks written in 10+ languages. The table below
 | fail | ✅ Supported | — | |
 | deno ⭐ | 🚧 WIP | — | Experimental support in `prek`; upstream `pre-commit` lacks a native `deno` language. |
 | ruby | 🚧 WIP | [#43](https://github.com/j178/prek/issues/43) | `prek` does not currently support downloading new Ruby versions, but can use multiple simultaneously installed interpreters |
-| rust | 🚧 Planned | [#44](https://github.com/j178/prek/issues/44) | |
 | conda | 🚧 Planned | [#52](https://github.com/j178/prek/issues/52) | |
 | coursier | 🚧 Planned | [#53](https://github.com/j178/prek/issues/53) | |
 | dart | 🚧 Planned | [#51](https://github.com/j178/prek/issues/51) | |

src/languages/golang/golang.rs

@@ -30,7 +30,7 @@ impl LanguageImpl for Golang {
         let progress = reporter.on_install_start(&hook);
 
         // 1. Install Go
-        let go_dir = store.tools_path(crate::store::ToolBucket::Go);
+        let go_dir = store.tools_path(ToolBucket::Go);
         let installer = GoInstaller::new(go_dir);
 
         let (version, allows_download) = match &hook.language_request {