feat: remove the need of an external JS runtime for processing grammars

crates/cli/Cargo.toml

@@ -30,7 +30,9 @@ name = "benchmark"
 harness = false
 
 [features]
+default = ["qjs-rt"]
 wasm = ["tree-sitter/wasm", "tree-sitter-loader/wasm"]
+qjs-rt = ["tree-sitter-generate/qjs-rt"]
 
 [dependencies]
 ansi_colours.workspace = true

crates/cli/package.nix

@@ -3,6 +3,8 @@
   src,
   rustPlatform,
   version,
+  clang,
+  libclang,
   cmake,
   pkg-config,
   nodejs_22,
@@ -21,6 +23,7 @@ rustPlatform.buildRustPackage {
   cargoBuildFlags = [ "--all-features" ];
 
   nativeBuildInputs = [
+    clang
     cmake
     pkg-config
     nodejs_22
@@ -29,6 +32,8 @@ rustPlatform.buildRustPackage {
 
   cargoLock.lockFile = ../../Cargo.lock;
 
+  env.LIBCLANG_PATH = "${libclang.lib}/lib";
+
   preBuild = ''
     rm -rf test/fixtures
     mkdir -p test/fixtures

crates/cli/src/main.rs

@@ -143,6 +143,7 @@ struct Generate {
     #[arg(long)]
     pub json: bool,
     /// The name or path of the JavaScript runtime to use for generating parsers
+    #[cfg(not(feature = "qjs-rt"))]
     #[arg(
         long,
         value_name = "EXECUTABLE",
@@ -150,6 +151,17 @@ struct Generate {
         default_value = "node"
     )]
     pub js_runtime: Option<String>,
+
+    #[cfg(feature = "qjs-rt")]
+    #[arg(
+        long,
+        value_name = "EXECUTABLE",
+        env = "TREE_SITTER_JS_RUNTIME",
+        default_value = "node"
+    )]
+    /// The name or path of the JavaScript runtime to use for generating parsers, specify `native`
+    /// to use the native `QuickJS` runtime
+    pub js_runtime: Option<String>,
 }
 
 #[derive(Args)]
@@ -868,6 +880,7 @@ impl Generate {
             // TODO: migrate to `warn!` once https://github.com/tree-sitter/tree-sitter/pull/4604 is merged
             eprintln!("Warning: --build is deprecated, use --stage=lib instead");
         }
+
         if let Err(err) = tree_sitter_generate::generate_parser_in_directory(
             current_dir,
             self.output.as_deref(),