Mikubot-2/plugins/greetings.lua

 -- Put this on the bottom of your plugin list, after help.lua.
 -- If you want to configure your own greetings, copy the following table
 -- (without the "config.") to your config.lua file.

local greetings = {}

local bindings = require('bindings')
local utilities = require('utilities')

function greetings:init()
	if not self.config.greetings then
		self.config.greetings = {
			['Hello, #NAME.'] = {
				'hello',
				'hey',
				'sup',
				'hi',
				'good morning',
				'good day',
				'good afternoon',
				'good evening'
			},
			['Goodbye, #NAME.'] = {
				'bye',
				'later',
				'see ya',
				'good night'
			},
			['Welcome back, #NAME.'] = {
				'i\'m home',
				'i\'m back'
			},
			['You\'re welcome, #NAME.'] = {
				'thanks',
				'thank you'
			}
		}
	end

	greetings.triggers = {
		self.info.first_name .. '%p*$'
	}
end

function greetings:action(msg)

	local nick = self.database.users[msg.from.id_str].nickname or msg.from.first_name

	for trigger,responses in pairs(self.config.greetings) do
		for _,response in pairs(responses) do
			if msg.text_lower:match(response..',? '..self.info.first_name) then
				bindings.sendMessage(self, msg.chat.id, utilities.latcyr(trigger:gsub('#NAME', nick)))
				return
			end
		end
	end

	return true

end

return greetings