refactor!: removing Rust loader generator

It is incomplete and it's not something I'll actually be using in my own
projects. I don't have anything Rust-y that uses OpenGL, Vulkan, EGL, or
anything like that.

So for now, let's stick to just doing what we're best at: making
a C loader.

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

Author: tycho

README.md

@@ -6,7 +6,7 @@
 [crates.io]: https://crates.io/crates/gloam
 
 A loader generator for Vulkan, OpenGL, OpenGL ES, EGL, GLX, and WGL.
-Reads Khronos XML spec files and generates C or Rust dispatch code.
+Reads Khronos XML spec files and generates C dispatch code.
 
 gloam is a clean-room rewrite of [GLAD](https://github.com/Dav1dde/glad) in Rust,
 with first-class support for ANGLE extension supplementals, Vulkan command-scope
@@ -27,9 +27,6 @@ cargo build --release
 # 3. Generate a C loader for OpenGL 3.3 core + all extensions.
 ./target/release/gloam --api gl:core=3.3 c --loader
 
-# 4. Generate a Rust loader for Vulkan 1.3.
-./target/release/gloam --api vk=1.3 rust
-
 # 5. Generate a combined GL 3.3 + GLES 2.0 + Vulkan + EGL loader.
 ./target/release/gloam --api gl:core,gles2,vulkan,egl --merge c --alias --loader
 ```
@@ -83,8 +80,6 @@ Commands:
                   was loaded by the driver (or vice versa), the pointer
                   is propagated to both slots.
         --loader  Include a built-in dlopen/LoadLibrary convenience layer.
-  rust  Generate a Rust loader.
-        --alias   Enable bijective function-pointer alias resolution.
 ```
 
 ### Extension selection flags
@@ -282,4 +277,4 @@ cargo build --release  # release
 cargo test
 ```
 
-Requires Rust 1.75 or later.
+Requires Rust 1.87 or later.

src/cli.rs

@@ -65,8 +65,6 @@ pub struct Cli {
 pub enum Generator {
     /// Generate a C loader.
     C(CArgs),
-    /// Generate a Rust loader.
-    Rust(RustArgs),
 }
 
 #[derive(Args, Debug)]
@@ -80,13 +78,6 @@ pub struct CArgs {
     pub loader: bool,
 }
 
-#[derive(Args, Debug)]
-pub struct RustArgs {
-    /// Enable bijective function-pointer alias resolution.
-    #[arg(long)]
-    pub alias: bool,
-}
-
 impl Cli {
     pub fn api_requests(&self) -> Result<Vec<ApiRequest>> {
         self.api

src/generator/mod.rs

@@ -1,5 +1,4 @@
 //! Code generation. Sub-modules render minijinja templates against a
-//! resolved `FeatureSet` to produce C and Rust loader files.
+//! resolved `FeatureSet` to produce C loader files.
 
 pub mod c;
-pub mod rust;

src/generator/rust/mod.rs

@@ -52,14 +52,6 @@ fn run() -> Result<()> {
                 generator::c::generate(fs, c_args, out, cli.fetch, &command_line)?;
             }
         }
-        Generator::Rust(r_args) => {
-            if !cli.quiet {
-                eprintln!("gloam: generating Rust loader...");
-            }
-            for fs in &feature_sets {
-                generator::rust::generate(fs, r_args, out)?;
-            }
-        }
     }
 
     if !cli.quiet {

src/generator/rust/templates/mod.rs.j2

@@ -267,7 +267,6 @@ pub fn build_feature_sets(cli: &Cli) -> Result<Vec<FeatureSet>> {
 
     let alias = match &cli.generator {
         crate::cli::Generator::C(c) => c.alias,
-        crate::cli::Generator::Rust(r) => r.alias,
     };
 
     // Group requests by spec family only for merged builds.