local myname = "Jarvis"
local delimiters = {",", ":", " "}

local getFromChat = function()
    --wait for a message in the chat
    while true do
        -- a chat message triggers an event that we capture
        local event, player, message = os.pullEvent("chat")
        --[[ ---------------------
            the following line detects the bots name

            message:sub(1,6) is the first 6 letters of the message, that's where we
            expect the name to be. You can of course check the whole line by removing the
            :sub(1,6)-part

            message:sub(1,6):lower() makes the first 6 letters lower case so we don't have to
            worry if users type "jarvis" or "Jarvis"

            message:sub(1,6):lower():find("something") checks if there is a string "something"
            in the first 6 letters of the message (that is converted to lower case). Because
            we wand to find the name of the bot we use myname:lower() in place of "something".
            (remember we converted the message to lower case so we should also convert our name)

            the line message:sub(1,6):lower():find(myname:lower()) equals a number if myname is in
            the message and nil otherwise

            we could also write
                if message:sub(1,6):lower() == myname:lower() then
            because we just check the first 6 letters anyway

        --]]----------------------
        if message:sub(1,6):lower():find(myname:lower()) then
            -- we set the index to the length of the message
            local min_index = #message
            -- and then try to find the delimiter (, : or " ") closest to the beginning of
            -- the message
            for a,del in ipairs(delimiters) do
                local i = message:find(del)
                if i and i < min_index then min_index = i end
            end
            -- if there is a delimiter before the end of the message we take everything after
            -- that and send it to cleverbot
            if min_index < #message then
                return message:sub(min_index+1)
            end
        end
    end
end