Mikubot-2/otouto/plugins/greetings.lua

local utilities = require('otouto.utilities')

local greetings = {}

function greetings:init(config)
    greetings.triggers = {}
    for _, triggers in pairs(config.greetings) do
        for i = 1, #triggers do
            triggers[i] = '^' .. triggers[i] .. ',? ' .. self.info.first_name:lower() .. '%p*$'
            table.insert(greetings.triggers, triggers[i])
        end
    end
end

function greetings:action(msg, config)
    local nick
    if self.database.userdata[tostring(msg.from.id)] then
        nick = self.database.userdata[tostring(msg.from.id)].nickname
    end
    nick = nick or utilities.build_name(msg.from.first_name, msg.from.last_name)

    for response, triggers in pairs(config.greetings) do
        for _, trigger in pairs(triggers) do
            if string.match(msg.text_lower, trigger) then
                utilities.send_message(msg.chat.id, response:gsub('#NAME', nick))
                return
            end
        end
    end
end

return greetings