From 7e8a8482e8e474b9ec45c1bd147dd0b0f4ff03af Mon Sep 17 00:00:00 2001
From: Christian Clason <christian.clason@uni-due.de>
Date: Tue, 29 Jun 2021 15:59:57 +0200
Subject: [PATCH] fixup(ts): put ts_query_cursor_set_match_limit behind feature
 guard

This is a fixup for #14915, which used the above-mentioned call to
restore the behavior of the pre-release version of tree-sitter to
that of 0.19.5. However, this function was introduced after 0.19.5,
breaking distro builds that link against 0.19.5 instead of the tag
specified in neovim's build script.

Now the function should only be called when it is available _and_
needed. Once tree-sitter is bumped to 0.19.6 (when this is released),
this guard can be removed again.

Fixes #14923 (among others)
---
 CMakeLists.txt            | 16 ++++++++++++++++
 src/nvim/lua/treesitter.c |  4 ++++
 2 files changed, 20 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 346600740e..0bb2695cf4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -393,6 +393,22 @@ include_directories(SYSTEM ${LIBLUV_INCLUDE_DIRS})
 find_package(TreeSitter REQUIRED)
 include_directories(SYSTEM ${TreeSitter_INCLUDE_DIRS})
 
+list(APPEND CMAKE_REQUIRED_INCLUDES "${TreeSitter_INCLUDE_DIRS}")
+list(APPEND CMAKE_REQUIRED_LIBRARIES "${TreeSitter_LIBRARIES}")
+check_c_source_compiles("
+#include <tree_sitter/api.h>
+int
+main(void)
+{
+  TSQueryCursor *cursor = ts_query_cursor_new();
+  ts_query_cursor_set_match_limit(cursor, 32);
+  return 0;
+}
+" TS_HAS_SET_MATCH_LIMIT)
+if(TS_HAS_SET_MATCH_LIMIT)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DNVIM_TS_HAS_SET_MATCH_LIMIT")
+endif()
+
 # Note: The test lib requires LuaJIT; it will be skipped if LuaJIT is missing.
 option(PREFER_LUA "Prefer Lua over LuaJIT in the nvim executable." OFF)
 
diff --git a/src/nvim/lua/treesitter.c b/src/nvim/lua/treesitter.c
index 11d30aae09..e3fa48f530 100644
--- a/src/nvim/lua/treesitter.c
+++ b/src/nvim/lua/treesitter.c
@@ -1073,7 +1073,11 @@ static int node_rawquery(lua_State *L)
   // TODO(bfredl): these are expensive allegedly,
   // use a reuse list later on?
   TSQueryCursor *cursor = ts_query_cursor_new();
+  // TODO(clason): API introduced after tree-sitter release 0.19.5
+  // remove guard when minimum ts version is bumped to 0.19.6+
+#ifdef NVIM_TS_HAS_SET_MATCH_LIMIT
   ts_query_cursor_set_match_limit(cursor, 32);
+#endif
   ts_query_cursor_exec(cursor, query, node);
 
   bool captures = lua_toboolean(L, 3);