Refactor / add debounce

lua/statusline-action-hints/init.lua

@@ -1,4 +1,4 @@
-M = {}
+local M = {}
 
 M.config = {
 	definition_identifier = "gd",
@@ -9,81 +9,83 @@ M.references_available = false
 M.reference_count = 0
 M.definition_available = false
 
-local function references()
+local function debounce(func, delay)
+	local timer_id = nil
+	return function(...)
+		if timer_id then
+			vim.fn.timer_stop(timer_id)
+		end
+		local args = { ... }
+		timer_id = vim.fn.timer_start(delay, function()
+			func(unpack(args))
+		end)
+	end
+end
+
+local function get_current_context()
 	local bufnr = vim.api.nvim_get_current_buf()
 	local cursor = vim.api.nvim_win_get_cursor(0)
 	local bufname = vim.api.nvim_buf_get_name(bufnr)
+	return bufnr, { line = cursor[1] - 1, character = cursor[2] }, bufname
+end
 
-	local params = {
-		textDocument = { uri = bufname },
-		position = { line = cursor[1] - 1, character = cursor[2] },
+local function lsp_request(method, params, callback)
+	local bufnr, position, uri = get_current_context()
+	params.textDocument = { uri = uri }
+	params.position = position
+	vim.lsp.buf_request(bufnr, method, params, callback)
+end
+
+local function references()
+	lsp_request("textDocument/references", {
 		context = { includeDeclaration = true },
-	}
-
-	vim.lsp.buf_request(bufnr, "textDocument/references", params, function(err, result, _, _)
+	}, function(err, result, _, _)
 		if err then
 			error(tostring(err))
 		end
 
-		if not result then
+		if not result or vim.tbl_count(result) == 0 then
 			M.references_available = false
 			M.reference_count = 0
 			return false
 		end
 
-		if vim.tbl_count(result) > 0 then
-			M.references_available = true
-			M.reference_count = vim.tbl_count(result) - 1
-			return true
-		end
-
-		M.references_available = false
-		M.reference_count = 0
-		return false
+		M.references_available = true
+		M.reference_count = vim.tbl_count(result) - 1
+		return true
 	end)
 end
 
 local function definition()
-	local bufnr = vim.api.nvim_get_current_buf()
-	local cursor = vim.api.nvim_win_get_cursor(0)
-	local bufname = vim.api.nvim_buf_get_name(bufnr)
-
-	local params = {
-		textDocument = { uri = bufname },
-		position = { line = cursor[1] - 1, character = cursor[2] },
-	}
-
-	vim.lsp.buf_request(bufnr, "textDocument/definition", params, function(err, result, _, _)
+	lsp_request("textDocument/definition", {}, function(err, result, _, _)
 		if err then
 			error(tostring(err))
 		end
 
-		if not result then
+		if not result or vim.tbl_count(result) == 0 then
 			M.definition_available = false
 			return false
 		end
 
-		if vim.tbl_count(result) > 0 then
-			M.definition_available = true
-			return true
-		end
-
-		M.definition_available = false
-		return false
+		M.definition_available = true
+		return true
 	end)
 end
 
+local debounced_references = debounce(references, 100)
+local debounced_definition = debounce(definition, 100)
+
 M.statusline = function()
-	references()
-	definition()
+	debounced_references()
+	debounced_definition()
 
 	local definition_status = ""
 
 	if M.definition_available then
-		definition_status = require("statusline-action-hints").config.definition_identifier
+		definition_status = M.config.definition_identifier
 	end
 
-	return string.format(require("statusline-action-hints").config.template, definition_status, M.reference_count)
+	return string.format(M.config.template, definition_status, M.reference_count)
 end
 
 M.setup = function(options)
@@ -93,7 +95,7 @@ M.setup = function(options)
 
 	-- merge user supplied options with defaults..
 	for k, v in pairs(options) do
-		require("statusline-action-hints").config[k] = v
+		M.config[k] = v
 	end
 end