modlib/log.lua

-- Log helpers - write to log, force writing to file
minetest.mkdir(minetest.get_worldpath() .. "/logs")
channels = {}
last_day = os.date("%d")
function get_path(logname)
    return minetest.get_worldpath() .. "/logs/" .. logname
end
function create_channel(title)
    local dir = get_path(title)
    minetest.mkdir(dir)
    channels[title] = {dirname = dir, queue = {}}
    write(title, "Initialisation")
end
function write(channelname, msg)
    local channel = channels[channelname]
    local current_day = os.date("%d")
    if current_day ~= last_day then
        last_day = current_day
        write_to_file(channelname, channel, os.date("%Y-%m-%d"))
    end
    table.insert(channel.queue, os.date("[%H:%M:%S] ") .. msg)
end
function write_to_all(msg)
    for channelname, _ in pairs(channels) do
        write(channelname, msg)
    end
end
function write_to_file(name, channel, current_date)
    if not channel then
        channel = channels[name]
    end
    if #(channel.queue) > 0 then
        local filename = channel.dirname .. "/" .. (current_date or os.date("%Y-%m-%d")) .. ".txt"
        local rope = {}
        for _, msg in ipairs(channel.queue) do
            table.insert(rope, msg)
        end
        modlib.file.append(filename, table.concat(rope, "\n") .. "\n")
        channels[name].queue = {}
    end
end
function write_all_to_file()
    local current_date = os.date("%Y-%m-%d")
    for name, channel in pairs(channels) do
        write_to_file(name, channel, current_date)
    end
end
function write_safe(channelname, msg)
    write(channelname, msg)
    write_all_to_file()
end

local timer = 0

minetest.register_globalstep(
    function(dtime)
        timer = timer + dtime
        if timer > 5 then
            write_all_to_file()
            timer = 0
        end
    end
)

minetest.register_on_mods_loaded(
    function()
        write_to_all("Mods loaded")
    end
)

minetest.register_on_shutdown(
    function()
        write_to_all("Shutdown")
        write_all_to_file()
    end
)