feat(treesitter): add support for wasm parsers

Problem: Installing treesitter parser is hard (harder than
climbing to heaven).

Solution: Add optional support for wasm parsers with `wasmtime`.

Notes:

* Needs to be enabled by setting `ENABLE_WASMTIME` for tree-sitter and
  Neovim. Build with
  `make CMAKE_EXTRA_FLAGS=-DENABLE_WASMTIME=ON
  DEPS_CMAKE_FLAGS=-DENABLE_WASMTIME=ON`
* Adds optional Rust (obviously) and C11 dependencies.
* Wasmtime comes with a lot of features that can negatively affect
  Neovim performance due to library and symbol table size. Make sure to
  build with minimal features and full LTO.
* To reduce re-compilation times, install `sccache` and build with
  `RUSTC_WRAPPER=<path/to/sccache> make ...`

1 files changed, 8 insertions, 2 deletions

diff --git a/src/nvim/lua/executor.c b/src/nvim/lua/executor.c
index 4d5b2c3698..d4940f3add 100644
--- a/src/nvim/lua/executor.c
+++ b/src/nvim/lua/executor.c
@@ -924,6 +924,7 @@ void nlua_free_all_mem(void)
   lua_State *lstate = global_lstate;
   nlua_unref_global(lstate, require_ref);
   nlua_common_free_all_mem(lstate);
+  tslua_free();
 }
 
 static void nlua_common_free_all_mem(lua_State *lstate)
@@ -1902,8 +1903,13 @@ static void nlua_add_treesitter(lua_State *const lstate) FUNC_ATTR_NONNULL_ALL
   lua_pushcfunction(lstate, tslua_push_querycursor);
   lua_setfield(lstate, -2, "_create_ts_querycursor");
 
-  lua_pushcfunction(lstate, tslua_add_language);
-  lua_setfield(lstate, -2, "_ts_add_language");
+  lua_pushcfunction(lstate, tslua_add_language_from_object);
+  lua_setfield(lstate, -2, "_ts_add_language_from_object");
+
+#ifdef HAVE_WASMTIME
+  lua_pushcfunction(lstate, tslua_add_language_from_wasm);
+  lua_setfield(lstate, -2, "_ts_add_language_from_wasm");
+#endif
 
   lua_pushcfunction(lstate, tslua_has_language);
   lua_setfield(lstate, -2, "_ts_has_language");