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, 7 insertions, 3 deletions

diff --git a/test/functional/treesitter/language_spec.lua b/test/functional/treesitter/language_spec.lua
index ba2d2218e3..6c211049f0 100644
--- a/test/functional/treesitter/language_spec.lua
+++ b/test/functional/treesitter/language_spec.lua
@@ -57,8 +57,12 @@ describe('treesitter language API', function()
     local keys, fields, symbols = unpack(exec_lua(function()
       local lang = vim.treesitter.language.inspect('c')
       local keys, symbols = {}, {}
-      for k, _ in pairs(lang) do
-        keys[k] = true
+      for k, v in pairs(lang) do
+        if type(v) == 'boolean' then
+          keys[k] = v
+        else
+          keys[k] = true
+        end
       end
 
       -- symbols array can have "holes" and is thus not a valid msgpack array
@@ -69,7 +73,7 @@ describe('treesitter language API', function()
       return { keys, lang.fields, symbols }
     end))
 
-    eq({ fields = true, symbols = true, _abi_version = true }, keys)
+    eq({ fields = true, symbols = true, _abi_version = true, _wasm = false }, keys)
 
     local fset = {}
     for _, f in pairs(fields) do