feat: generate Rust bindings during build process

It can be used as:
  > cargo build -p tree-sitter -F bindgen

lib/binding_rust/build.rs

@@ -17,6 +17,9 @@ fn main() {
         }
     }
 
+    #[cfg(feature = "bindgen")]
+    generate_bindings();
+
     let src_path = Path::new("src");
     for entry in fs::read_dir(&src_path).unwrap() {
         let entry = entry.unwrap();
@@ -34,6 +37,44 @@ fn main() {
         .compile("tree-sitter");
 }
 
+#[cfg(feature = "bindgen")]
+fn generate_bindings() {
+    const HEADER_PATH: &str = "include/tree_sitter/api.h";
+
+    println!("cargo:rerun-if-changed={}", HEADER_PATH);
+
+    let no_copy = [
+        "TSInput",
+        "TSLanguage",
+        "TSLogger",
+        "TSLookaheadIterator",
+        "TSParser",
+        "TSTree",
+        "TSQuery",
+        "TSQueryCursor",
+        "TSQueryCapture",
+        "TSQueryMatch",
+        "TSQueryPredicateStep",
+    ];
+
+    let bindings = bindgen::Builder::default()
+        .header(HEADER_PATH)
+        .layout_tests(false)
+        .allowlist_type("^TS.*")
+        .allowlist_function("^ts_.*")
+        .allowlist_var("^TREE_SITTER.*")
+        .no_copy(no_copy.join("|"))
+        .generate()
+        .expect("Failed to generate bindings");
+
+    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
+    let bindings_rs = out_dir.join("bindings.rs");
+
+    bindings.write_to_file(&bindings_rs).expect(&*format!(
+        "Failed to write bindings into path: {bindings_rs:?}"
+    ));
+}
+
 fn which(exe_name: impl AsRef<Path>) -> Option<PathBuf> {
     env::var_os("PATH").and_then(|paths| {
         env::split_paths(&paths).find_map(|dir| {

lib/binding_rust/ffi.rs

@@ -2,6 +2,10 @@
 #![allow(non_upper_case_globals)]
 #![allow(non_camel_case_types)]
 
+#[cfg(feature = "bindgen")]
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+
+#[cfg(not(feature = "bindgen"))]
 include!("./bindings.rs");
 
 extern "C" {

lib/binding_rust/lib.rs

@@ -27,12 +27,13 @@ use std::{
 /// The Tree-sitter library is generally backwards-compatible with languages
 /// generated using older CLI versions, but is not forwards-compatible.
 #[doc(alias = "TREE_SITTER_LANGUAGE_VERSION")]
-pub const LANGUAGE_VERSION: usize = ffi::TREE_SITTER_LANGUAGE_VERSION;
+pub const LANGUAGE_VERSION: usize = ffi::TREE_SITTER_LANGUAGE_VERSION as usize;
 
 /// The earliest ABI version that is supported by the current version of the
 /// library.
 #[doc(alias = "TREE_SITTER_MIN_COMPATIBLE_LANGUAGE_VERSION")]
-pub const MIN_COMPATIBLE_LANGUAGE_VERSION: usize = ffi::TREE_SITTER_MIN_COMPATIBLE_LANGUAGE_VERSION;
+pub const MIN_COMPATIBLE_LANGUAGE_VERSION: usize =
+    ffi::TREE_SITTER_MIN_COMPATIBLE_LANGUAGE_VERSION as usize;
 
 pub const PARSER_HEADER: &'static str = include_str!("../include/tree_sitter/parser.h");