This is now the best Lua logging library ever made.

log.lua

@@ -1,11 +1,8 @@
-local stored_messages = {}
-local display_levels = {}
-local enable_logging = true
-local message_limit = math.huge
-
 -- USAGE:
 --   -- set arbitrary log levels to be printed immediately
---   log{ info = true, warning = true, }
+--   log{ info = true, warning = true, ducksauce = true, }
+--   -- disable storage of messages depending on log level
+--   log{ error = false, verbose = false, }
 --   -- send anything (except nil) to a log level
 --   log("bacom", true, "text", 5, function() end, {})
 --   -- print all messages saved at a particular log level
@@ -16,60 +13,70 @@ local message_limit = math.huge
 --   log(50) -- warning: reaching large limits makes logging expensive
 --   -- do anything to the stored messages (this example deletes them all)
 --  log(function(messages) return {} end)
+--  -- check if a log level is being displayed
+--  if log.arbitrary_exit then log("arbitrary_exit") os.exit(1) end
 
-return function(options, ...)
+local microlog = {} -- display_levels are stored directly here
-  local options_type = type(options)
+local stored_messages = {}
+local enable_logging = true
+local message_limit = math.huge
 
-  if (options_type == "string") and enable_logging then
+return setmetatable(microlog, {
-    if not stored_messages[options] then stored_messages[options] = {} end
+  __call = function(options, ...)
-    local message_table = stored_messages[options]
+    local options_type = type(options)
 
-    -- turn log message into text
+    if (options_type == "string") and enable_logging then
-    local tab = {...}
+      if microlog[options] == false then return end
-    for i = 1, #tab do
+      if not stored_messages[options] then stored_messages[options] = {} end
-      tab[i] = tostring(tab[i])
+      local message_table = stored_messages[options]
-    end
-    local current_message = table.concat(tab, "\t")
 
-    if #current_message == 0 then
+      -- turn log message into text
-      -- print all stored_messages of specified level
+      local tab = {...}
-      for i = 1, #message_table do
+      for i = 1, #tab do
-        print(message_table[i])
+        tab[i] = tostring(tab[i])
+      end
+      local current_message = table.concat(tab, "\t")
+
+      if #current_message == 0 then
+        -- print all stored_messages of specified level
+        for i = 1, #message_table do
+          print(message_table[i])
+        end
+
+      else
+        -- store message (and print if in display_levels)
+        message_table[#message_table + 1] = current_message
+        if #message_table > message_limit then table.remove(message_table, 1) end
+        if microlog[options] then print(current_message) end
       end
 
-    else
+    -- set display_levels
-      -- store message (and print if in display_levels)
+    elseif options_type == "table" then
-      message_table[#message_table + 1] = current_message
+      for k,v in pairs(options) do
-      if #message_table > message_limit then table.remove(message_table, 1) end
+        microlog[k] = v
-      if display_levels[options] then print(current_message) end
-    end
-
-  -- set display_levels
-  elseif options_type == "table" then
-    for k,v in pairs(options) do
-      display_levels[k] = v
-    end
-
-  elseif options_type == "number" then
-    message_limit = options
-    for k,v in pairs(stored_messages) do
-      while #v > message_limit do
-        table.remove(v, 1)
       end
-    end
 
-  -- turn all logging off and delete stored messages; or turn it on
+    elseif options_type == "number" then
-  elseif options_type == "boolean" then
+      message_limit = options
-    if options then
+      for k,v in pairs(stored_messages) do
-      enable_logging = true
+        while #v > message_limit do
-    else
+          table.remove(v, 1)
-      enable_logging = false
+        end
-      stored_messages = {}
+      end
-    end
 
-  -- arbitrary access :D
+    -- turn all logging off and delete stored messages; or turn it on
-  elseif options_type == "function" then
+    elseif options_type == "boolean" then
-    local result = options(stored_messages)
+      if options then
-    if type(result) == "table" then stored_messages = result end
+        enable_logging = true
+      else
+        enable_logging = false
+        stored_messages = {}
+      end
+
+    -- arbitrary access :D
+    elseif options_type == "function" then
+      local result = options(stored_messages)
+      if type(result) == "table" then stored_messages = result end
+    end
   end
-end
+})