Replace serde_yaml with serde_json

`serde_yaml` was deprecated more than a year ago. See https://github.com/dtolnay/serde-yaml

Didn't find a nice replacement that is also typed. So why not just convert it to json?

Author: Earlopain

rakelib/cargo.rake

@@ -3,6 +3,9 @@ namespace :cargo do
 
   desc "Build and test the Rust packages"
   task build: [:templates] do
+    require "json"
+    require "yaml"
+
     gemspec = Gem::Specification.load("prism.gemspec")
 
     prism_sys_dir = Pathname(File.expand_path(File.join(__dir__, "../rust", "ruby-prism-sys")))
@@ -18,7 +21,11 @@ namespace :cargo do
 
     rm_rf(prism_dir.join("vendor"))
     mkdir_p(prism_vendor_dir)
-    cp(File.expand_path("../config.yml", __dir__), prism_vendor_dir.join("config.yml"))
+
+    # This used `serde_yaml` previously, which is now deprecated. Convert it to json
+    # so that `serde_json` can be used instead, keeping it strongly typed.
+    config_yaml = YAML.load_file(File.expand_path("../config.yml", __dir__))
+    File.write(prism_vendor_dir.join("config.json"), JSON.dump(config_yaml))
 
     # Align the Cargo.toml version with the gemspec version
     CRATES.each do |crate|

rust/Cargo.lock

@@ -23,7 +23,7 @@ include = ["src/", "build.rs", "Cargo.toml", "Cargo.lock", "vendor"]
 
 [build-dependencies]
 serde = { version = "1.0", features = ["derive"] }
-serde_yaml = "0.9"
+serde_json = "1.0"
 
 [dependencies]
 ruby-prism-sys = { version = "1.6.0", path = "../ruby-prism-sys" }

rust/ruby-prism/Cargo.toml

@@ -117,12 +117,12 @@ struct Config {
 ///
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let prism_dir = format!("prism-{}", env!("CARGO_PKG_VERSION"));
-    let config_path = Path::new(env!("CARGO_MANIFEST_DIR")).join("vendor").join(prism_dir).join("config.yml");
+    let config_path = Path::new(env!("CARGO_MANIFEST_DIR")).join("vendor").join(prism_dir).join("config.json");
 
     let config_file = std::fs::File::open(&config_path)?;
     println!("cargo:rerun-if-changed={}", config_path.to_str().unwrap());
 
-    let config: Config = serde_yaml::from_reader(config_file)?;
+    let config: Config = serde_json::from_reader(config_file)?;
     write_bindings(&config)?;
 
     Ok(())