Add nvim document-highlight lua module

vim/lua/lsp/document_highlight.lua

@@ -0,0 +1,32 @@
+local document_highlight = {}
+
+vim.api.nvim_create_augroup('lsp_document_highlight', {
+	clear = false
+})
+
+function document_highlight.start(bufnr)
+	vim.api.nvim_clear_autocmds({
+		buffer = bufnr,
+		group = 'lsp_document_highlight',
+	})
+	vim.api.nvim_create_autocmd({ 'CursorHold', 'CursorHoldI' }, {
+		group = 'lsp_document_highlight',
+		buffer = bufnr,
+		callback = vim.lsp.buf.document_highlight,
+	})
+	vim.api.nvim_create_autocmd({ 'CursorMoved', 'CursorMovedI' }, {
+		group = 'lsp_document_highlight',
+		buffer = bufnr,
+		callback = vim.lsp.buf.clear_references,
+	})
+end
+
+function document_highlight.stop(bufnr)
+	vim.api.nvim_clear_autocmds({
+		buffer = bufnr,
+		group = 'lsp_document_highlight',
+	})
+	vim.lsp.buf.clear_references()
+end
+
+return document_highlight