Use a settings object for the main settings

This unifies the settings APIs.

This also unifies the sync and async registration APIs, since the async
registration API did not support adding non-functions to the API table.

builtin/profiler/init.lua

@@ -15,10 +15,18 @@
 --with this program; if not, write to the Free Software Foundation, Inc.,
 --51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
+local function get_bool_default(name, default)
+	local val = core.settings:get_bool(name)
+	if val == nil then
+		return default
+	end
+	return val
+end
+
 local profiler_path = core.get_builtin_path()..DIR_DELIM.."profiler"..DIR_DELIM
 local profiler = {}
 local sampler = assert(loadfile(profiler_path .. "sampling.lua"))(profiler)
-local instrumentation  = assert(loadfile(profiler_path .. "instrumentation.lua"))(profiler, sampler)
+local instrumentation  = assert(loadfile(profiler_path .. "instrumentation.lua"))(profiler, sampler, get_bool_default)
 local reporter = dofile(profiler_path .. "reporter.lua")
 profiler.instrument = instrumentation.instrument
 
@@ -27,7 +35,7 @@ profiler.instrument = instrumentation.instrument
 -- Is called later, after `core.register_chatcommand` was set up.
 --
 function profiler.init_chatcommand()
-	local instrument_profiler = core.setting_getbool("instrument.profiler") or false
+	local instrument_profiler = get_bool_default("instrument.profiler", false)
 	if instrument_profiler then
 		instrumentation.init_chatcommand()
 	end

builtin/profiler/instrumentation.lua

@@ -17,8 +17,9 @@
 
 local format, pairs, type = string.format, pairs, type
 local core, get_current_modname = core, core.get_current_modname
-local profiler, sampler = ...
-local instrument_builtin = core.setting_getbool("instrument.builtin") or false
+local profiler, sampler, get_bool_default = ...
+
+local instrument_builtin = get_bool_default("instrument.builtin", false)
 
 local register_functions = {
 	register_globalstep = 0,
@@ -137,7 +138,7 @@ local function instrument_register(func, func_name)
 end
 
 local function init_chatcommand()
-	if core.setting_getbool("instrument.chatcommand") or true then
+	if get_bool_default("instrument.chatcommand", true) then
 		local orig_register_chatcommand = core.register_chatcommand
 		core.register_chatcommand = function(cmd, def)
 			def.func = instrument {
@@ -153,8 +154,7 @@ end
 -- Start instrumenting selected functions
 --
 local function init()
-	local is_set = core.setting_getbool
-	if is_set("instrument.entity") or true then
+	if get_bool_default("instrument.entity", true) then
 		-- Explicitly declare entity api-methods.
 		-- Simple iteration would ignore lookup via __index.
 		local entity_instrumentation = {
@@ -180,7 +180,7 @@ local function init()
 		end
 	end
 
-	if is_set("instrument.abm") or true then
+	if get_bool_default("instrument.abm", true) then
 		-- Wrap register_abm() to automatically instrument abms.
 		local orig_register_abm = core.register_abm
 		core.register_abm = function(spec)
@@ -193,7 +193,7 @@ local function init()
 		end
 	end
 
-	if is_set("instrument.lbm") or true then
+	if get_bool_default("instrument.lbm", true) then
 		-- Wrap register_lbm() to automatically instrument lbms.
 		local orig_register_lbm = core.register_lbm
 		core.register_lbm = function(spec)
@@ -206,13 +206,13 @@ local function init()
 		end
 	end
 
-	if is_set("instrument.global_callback") or true then
+	if get_bool_default("instrument.global_callback", true) then
 		for func_name, _ in pairs(register_functions) do
 			core[func_name] = instrument_register(core[func_name], func_name)
 		end
 	end
 
-	if is_set("instrument.profiler") or false then
+	if get_bool_default("instrument.profiler", false) then
 		-- Measure overhead of instrumentation, but keep it down for functions
 		-- So keep the `return` for better optimization.
 		profiler.empty_instrument = instrument {

builtin/profiler/reporter.lua

@@ -18,7 +18,7 @@
 local DIR_DELIM, LINE_DELIM = DIR_DELIM, "\n"
 local table, unpack, string, pairs, io, os = table, unpack, string, pairs, io, os
 local rep, sprintf, tonumber = string.rep, string.format, tonumber
-local core, setting_get = core, core.setting_get
+local core, settings = core, core.settings
 local reporter = {}
 
 ---
@@ -229,7 +229,7 @@ end
 
 local worldpath = core.get_worldpath()
 local function get_save_path(format, filter)
-	local report_path = setting_get("profiler.report_path") or ""
+	local report_path = settings:get("profiler.report_path") or ""
 	if report_path ~= "" then
 		core.mkdir(sprintf("%s%s%s", worldpath, DIR_DELIM, report_path))
 	end
@@ -249,7 +249,7 @@ end
 --
 function reporter.save(profile, format, filter)
 	if not format or format == "" then
-		format = setting_get("profiler.default_report_format") or "txt"
+		format = settings:get("profiler.default_report_format") or "txt"
 	end
 	if filter == "" then
 		filter = nil

builtin/profiler/sampling.lua

@@ -185,7 +185,7 @@ end
 function sampler.init()
 	sampler.reset()
 
-	if core.setting_getbool("instrument.profiler") then
+	if core.settings:get_bool("instrument.profiler") then
 		core.register_globalstep(function()
 			if logged_time == 0 then
 				return