add support to connect on socket.unix

Author: lneto

lib/socket/unix.lua

@@ -1,6 +1,6 @@
 --
 -- SPDX-FileCopyrightText: (c) 2025 Ring Zero Desenvolvimento de Software LTDA
--- SPDX-License-Identifier: MIT OR GPL-2.0-only 
+-- SPDX-License-Identifier: MIT OR GPL-2.0-only
 --
 
 ---
@@ -17,6 +17,15 @@ local sock = socket.sock
 
 local unix = {}
 
+---
+-- Connects a new UNIX domain socket to a specific path.
+-- @param path (string) The UNIX domain socket path.
+-- @param type (string) [optional] "STREAM" or "DGRAM".
+-- @return A new UNIX domain socket object (stream by default) connected to path.
+-- @raise Error if socket.new() or socket.connect() fail.
+-- @see socket.new
+-- @see socket.connect
+
 ---
 -- Binds a new UNIX domain socket to a specific path.
 -- @param path (string) The UNIX domain socket path.
@@ -25,12 +34,17 @@ local unix = {}
 -- @raise Error if socket.new() or socket.bind() fail.
 -- @see socket.new
 -- @see socket.bind
-function unix.bind(path, _type)
-	local t = _type and string.upper(_type) or "STREAM"
-	local s = socket.new(af.UNIX, sock[t], 0)
-	s:bind(path)
-	return s 
+local methods = {connect = true, bind = true}
+
+local function __index(_, method)
+	assert(methods[method], "undefined method")
+	return function (path, type)
+		local type = type and string.upper(type) or "STREAM"
+		local sock = socket.new(af.UNIX, sock[type], 0)
+		sock[method](sock, path)
+		return sock
+	end
 end
 
-return unix
+return setmetatable(unix, {__index = __index})