Treesitter breaks syntax detection

[Gtoasted]

When Treesitter is enabled, synstack() always returns an empty list, and thus functions like typst#in_math() stop working. I'm not sure if this is a fixable problem in this plugin, but maybe you could put a note in the readme, because it took me like a day to figure this out.

[kszenes]

Hi @Gtoasted thanks for sharing your findings! I was also trying to figure out why this method was misbehaving, so I think you saved me a lot of time. FYI, a quick fix is by adding typst to the highlight.additional_vim_regex_highlighting list in the treesitter config. This resolved the issue for me. Alternatively, it is not too difficult to write your own in_math, in_code etc. functions that uses treesitter queries directly.

[kszenes]

@Gtoasted FYI, I wrote my own helper functions which use the Treesitter nodes directly, in case this may be of use to you:

-- ~/.config/nvim/lua/luasnip-helper-funcs.lua
local M = {}

-- Checks if current cursor location has node_name as a rott
local ts_has_root = function(node_name)
	-- Get the current cursor position
	local row, col = unpack(vim.api.nvim_win_get_cursor(0))
	row = row - 1 -- Convert to 0-indexed
	col = math.max(0, col - 1) -- Fixes the issue that last char of line not included in comment

	-- Get the treesitter parser for the current buffer
	local bufnr = vim.api.nvim_get_current_buf()
	local filetype = vim.bo[bufnr].filetype
	local parser = vim.treesitter.get_parser(bufnr, filetype, {})

	if not parser then
		print("No parser available for the current buffer")
		return
	end

	-- Get the syntax tree
	local tree = parser:parse()[1]
	if not tree then
		print("No syntax tree available")
		return
	end

	local root = tree:root()
	local node_at_cursor = root:named_descendant_for_range(row, col, row, col)

	-- Walk up the tree to find a math node
	local current_node = node_at_cursor
	local has_root = false

	while current_node do
		if current_node:type() == node_name then
			has_root = true
			break
		end
		current_node = current_node:parent()
	end

	return has_root
end

-- Typst helper functions
local typst_utils = {}
typst_utils.in_text = function()
	return not ts_has_root("math") and not ts_has_root("comment") and not ts_has_root("raw_blck")
end
typst_utils.in_mathzone = function()
	return ts_has_root("math")
end
typst_utils.in_code = function()
	return ts_has_root("raw_blck")
end
typst_utils.in_comment = function()
	return ts_has_root("comment")
end
M.typst_utils = typst_utils
return M

[kaarmu]

Great findings! I haven't fully tried out the treesitter implementation yet, but I'll note this on the README. I'll also leave this open for the time being.