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

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)