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Flume embeds Lua 5.4. Scripts have access to the standard Lua library (string, table, math, os.time/date/clock) with dangerous functions removed for safety.

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Sandbox

The following are blocked in Lua scripts:
  • os.execute, os.remove, os.rename, os.getenv, os.exit
  • io.open, io.popen, io.input, io.output
  • dofile, loadfile
  • debug library
Use flume.config.get/set for persistent storage instead of file I/O.

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Example: Highlight Script

-- highlight.lua
flume.event.on("message", function(e)
    local words = flume.config.get("words") or ""
    for word in words:gmatch("%S+") do
        if e.text:lower():find(word:lower(), 1, true) then
            flume.ui.notify(e.nick .. " mentioned '" .. word .. "'")
        end
    end
end)

flume.command.register("highlight", function(args)
    if args == "" then
        local words = flume.config.get("words") or "(none)"
        flume.buffer.print("", "", "Highlight words: " .. words)
    else
        flume.config.set("words", args)
        flume.buffer.print("", "", "Highlight words set to: " .. args)
    end
end, "View or set highlight words")

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Example: Auto-Response

-- autorespond.lua
local responses = {
    ["!help"] = "Try /help for commands",
    ["!source"] = "https://github.com/FlumeIRC/flume",
}

flume.event.on("message", function(e)
    local reply = responses[e.text:lower()]
    if reply then
        flume.channel.say(e.server, e.channel, reply)
    end
end)