Improvements/fixes for noise parameter input in advanced settings

Formspec input for each individual noise parameter and flag.
Allow noise flags to be set in advanced settings, previously only settable
in minetest.conf.

Standardise 'group format' for noise parameters set in minetest.conf, as
only these support noise flags. However the older 'single line' format is
still accepted to support existing minetest.conf files.
Therefore auto-generate minetest.conf.example with noise parameters in
'group format'.

Setting 'type' in settingtypes.txt is now either 'noise_params_2D' or
'noise_params_3D', the dimension number is displayed in the advanced
settings edit page.

builtin/mainmenu/dlg_settings_advanced.lua

@@ -25,6 +25,10 @@ local CHAR_CLASSES = {
 	FLAGS = "[%w_%-%.,]",
 }
 
+local function flags_to_table(flags)
+	return flags:gsub("%s+", ""):split(",", true) -- Remove all spaces and split
+end
+
 -- returns error message, or nil
 local function parse_setting_line(settings, line, read_all, base_level, allow_secure)
 	-- comment
@@ -111,7 +115,7 @@ local function parse_setting_line(settings, line, read_all, base_level, allow_se
 		return
 	end
 
-	if setting_type == "string" or setting_type == "noise_params"
+	if setting_type == "string"
 			or setting_type == "key" or setting_type == "v3f" then
 		local default = remaining_line:match("^(.*)$")
 
@@ -133,6 +137,60 @@ local function parse_setting_line(settings, line, read_all, base_level, allow_se
 		return
 	end
 
+	if setting_type == "noise_params_2d"
+			or setting_type == "noise_params_3d" then
+		local default = remaining_line:match("^(.*)$")
+
+		if not default then
+			return "Invalid string setting"
+		end
+
+		local values = {}
+		local ti = 1
+		local index = 1
+		for line in default:gmatch("[+-]?[%d.-e]+") do -- All numeric characters
+			index = default:find("[+-]?[%d.-e]+", index) + line:len()
+			table.insert(values, line)
+			ti = ti + 1
+			if ti > 9 then
+				break
+			end
+		end
+		index = default:find("[^, ]", index)
+		local flags = ""
+		if index then
+			flags = default:sub(index)
+			default = default:sub(1, index - 3) -- Make sure no flags in single-line format
+		end
+		table.insert(values, flags)
+
+		table.insert(settings, {
+			name = name,
+			readable_name = readable_name,
+			type = setting_type,
+			default = default,
+			default_table = {
+				offset = values[1],
+				scale = values[2],
+				spread = {
+					x = values[3],
+					y = values[4],
+					z = values[5]
+				},
+				seed = values[6],
+				octaves = values[7],
+				persistence = values[8],
+				lacunarity = values[9],
+				flags = values[10]
+			},
+			values = values,
+			comment = current_comment,
+			noise_params = true,
+			flags = flags_to_table("defaults,eased,absvalue")
+		})
+		return
+	end
+
 	if setting_type == "bool" then
 		if remaining_line ~= "false" and remaining_line ~= "true" then
 			return "Invalid boolean setting"
@@ -236,7 +294,7 @@ local function parse_setting_line(settings, line, read_all, base_level, allow_se
 			readable_name = readable_name,
 			type = "flags",
 			default = default,
-			possible = possible,
+			possible = flags_to_table(possible),
 			comment = current_comment,
 		})
 		return
@@ -430,11 +488,61 @@ local function get_current_value(setting)
 	return value
 end
 
+local function get_current_np_group(setting)
+	local value = core.settings:get_np_group(setting.name)
+	local t = {}
+	if value == nil then
+		t = setting.values
+	else
+		table.insert(t, value.offset)
+		table.insert(t, value.scale)
+		table.insert(t, value.spread.x)
+		table.insert(t, value.spread.y)
+		table.insert(t, value.spread.z)
+		table.insert(t, value.seed)
+		table.insert(t, value.octaves)
+		table.insert(t, value.persistence)
+		table.insert(t, value.lacunarity)
+		table.insert(t, value.flags)
+	end
+	return t
+end
+
+local function get_current_np_group_as_string(setting)
+	local value = core.settings:get_np_group(setting.name)
+	local t
+	if value == nil then
+		t = setting.default
+	else
+		t = value.offset .. ", " ..
+			value.scale .. ", (" ..
+			value.spread.x .. ", " ..
+			value.spread.y .. ", " ..
+			value.spread.z .. "), " ..
+			value.seed .. ", " ..
+			value.octaves .. ", " ..
+			value.persistence .. ", " ..
+			value.lacunarity .. ", " ..
+			value.flags
+	end
+	return t
+end
+
+local checkboxes = {} -- handle checkboxes events
+
 local function create_change_setting_formspec(dialogdata)
 	local setting = settings[selected_setting]
-	local formspec = "size[10,5.2,true]" ..
-			"button[5,4.5;2,1;btn_done;" .. fgettext("Save") .. "]" ..
-			"button[3,4.5;2,1;btn_cancel;" .. fgettext("Cancel") .. "]" ..
+	local height = 5.2
+	if setting.type == "noise_params_2d" or setting.type == "noise_params_3d" then
+		-- Three flags, checkboxes on 2 columns, with a vertical space of 1/2 unit
+		height = 8.7
+	elseif setting.type == "flags" then
+		-- Checkboxes on 2 columns, with a vertical space of 1/2 unit
+		height = 5.2 + math.ceil(#setting.possible / 2) / 2
+	end
+	local formspec = "size[10," .. height .. ",true]" ..
+			"button[5," .. height - 0.7 .. ";2,1;btn_done;" .. fgettext("Save") .. "]" ..
+			"button[3," .. height - 0.7 .. ";2,1;btn_cancel;" .. fgettext("Cancel") .. "]" ..
 			"tablecolumns[color;text]" ..
 			"tableoptions[background=#00000000;highlight=#00000000;border=false]" ..
 			"table[0,0;10,3;info;"
@@ -459,21 +567,6 @@ local function create_change_setting_formspec(dialogdata)
 		formspec = formspec .. "," .. core.formspec_escape(comment_line) .. ","
 	end
 
-	if setting.type == "flags" then
-		formspec = formspec .. ",,"
-				.. "," .. fgettext("Please enter a comma seperated list of flags.") .. ","
-				.. "," .. fgettext("Possible values are: ")
-				.. core.formspec_escape(setting.possible:gsub(",", ", ")) .. ","
-	elseif setting.type == "noise_params" then
-		formspec = formspec .. ",,"
-				.. "," .. fgettext("Format:") .. ","
-				.. "," .. fgettext("<offset>, <scale>, (<spreadX>, <spreadY>, <spreadZ>),") .. ","
-				.. "," .. fgettext("<seed>, <octaves>, <persistence>, <lacunarity>") .. ","
-	elseif setting.type == "v3f" then
-		formspec = formspec .. ",,"
-				.. "," .. fgettext_ne("Format is 3 numbers separated by commas and inside brackets.") .. ","
-	end
-
 	formspec = formspec:sub(1, -2) -- remove trailing comma
 
 	formspec = formspec .. ";1]"
@@ -514,8 +607,91 @@ local function create_change_setting_formspec(dialogdata)
 				.. core.formspec_escape(current_value) .. "]"
 				.. "button[8,3.75;2,1;btn_browser_" .. setting.type .. ";" .. fgettext("Browse") .. "]"
 
+	elseif setting.type == "noise_params_2d" or setting.type == "noise_params_3d" then
+		local t = get_current_np_group(setting)
+		local dimension = 3
+		if setting.type == "noise_params_2d" then
+			dimension = 2
+		end
+
+		formspec = formspec
+				.. "label[0,2.5;(" .. dimension .. "D Noise)]"
+				.. "field[0.5,4;3.3,1;te_offset;Offset;" -- Offset
+				.. core.formspec_escape(t[1] or "") .. "]"
+				.. "field[3.8,4;3.3,1;te_scale;Scale;" -- Scale
+				.. core.formspec_escape(t[2] or "") .. "]"
+				.. "field[7.1,4;3.3,1;te_seed;Seed;" -- Seed
+				.. core.formspec_escape(t[6] or "") .. "]"
+				.. "label[0.5,4.7;Spread]" -- Spread
+				.. "field[2.0,5;2.8,1;te_spreadx;X;"
+				.. core.formspec_escape(t[3] or "") .. "]"
+				.. "field[4.8,5;2.8,1;te_spready;Y;"
+				.. core.formspec_escape(t[4] or "") .. "]"
+				.. "field[7.6,5;2.8,1;te_spreadz;Z;"
+				.. core.formspec_escape(t[5] or "") .. "]"
+				.. "field[0.5,6;3.3,1;te_octaves;Octaves;" -- Octaves
+				.. core.formspec_escape(t[7] or "") .. "]"
+				.. "field[3.8,6;3.3,1;te_persist;Persistance;" -- Persistance
+				.. core.formspec_escape(t[8] or "") .. "]"
+				.. "field[7.1,6;3.3,1;te_lacun;Lacunarity;" -- Lacunarity
+				.. core.formspec_escape(t[9] or "") .. "]"
+
+		local enabled_flags = flags_to_table(t[10])
+		local flags = {}
+		for _, name in ipairs(enabled_flags) do
+			-- Index by name, to avoid iterating over all enabled_flags for every possible flag.
+			flags[name] = true
+		end
+		-- Flags
+		formspec = formspec
+				.. "checkbox[0.5,6.5;cb_defaults;defaults;" -- defaults
+				.. tostring(flags["defaults"] == true) .. "]" -- to get false if nil
+				.. "checkbox[5,6.5;cb_eased;eased;" -- eased
+				.. tostring(flags["eased"] == true) .. "]"
+				.. "checkbox[5,7.0;cb_absvalue;absvalue;" -- absvalue
+				.. tostring(flags["absvalue"] == true) .. "]"
+
+	elseif setting.type == "v3f" then
+		local val = get_current_value(setting)
+		local v3f = {}
+		for line in val:gmatch("[+-]?[%d.-e]+") do -- All numeric characters
+			table.insert(v3f, line)
+		end
+
+		formspec = formspec
+				.. "field[0.5,4;3.3,1;te_x;X;" -- X
+				.. core.formspec_escape(v3f[1] or "") .. "]"
+				.. "field[3.8,4;3.3,1;te_y;Y;" -- Y
+				.. core.formspec_escape(v3f[2] or "") .. "]"
+				.. "field[7.1,4;3.3,1;te_z;Z;" -- Z
+				.. core.formspec_escape(v3f[3] or "") .. "]"
+
+	elseif setting.type == "flags" then
+		local enabled_flags = flags_to_table(get_current_value(setting))
+		local flags = {}
+		for _, name in ipairs(enabled_flags) do
+			-- Index by name, to avoid iterating over all enabled_flags for every possible flag.
+			flags[name] = true
+		end
+		local flags_count = #setting.possible
+		for i, name in ipairs(setting.possible) do
+			local x = 0.5
+			local y = 3.5 + i / 2
+			if i - 1 >= flags_count / 2 then -- 2nd column
+				x = 5
+				y = y - flags_count / 4
+			end
+			local checkbox_name = "cb_" .. name
+			local is_enabled = flags[name] == true -- to get false if nil
+			checkboxes[checkbox_name] = is_enabled
+			formspec = formspec .. "checkbox["
+					.. x .. "," .. y
+					.. ";" .. checkbox_name .. ";"
+					.. name .. ";" .. tostring(is_enabled) .. "]"
+		end
+
 	else
-		-- TODO: fancy input for float, int, flags, noise_params, v3f
+		-- TODO: fancy input for float, int
 		local width = 10
 		local text = get_current_value(setting)
 		if dialogdata.error_message then
@@ -535,8 +711,8 @@ local function create_change_setting_formspec(dialogdata)
 end
 
 local function handle_change_setting_buttons(this, fields)
+	local setting = settings[selected_setting]
 	if fields["btn_done"] or fields["key_enter"] then
-		local setting = settings[selected_setting]
 		if setting.type == "bool" then
 			local new_value = fields["dd_setting_value"]
 			-- Note: new_value is the actual (translated) value shown in the dropdown
@@ -579,17 +755,49 @@ local function handle_change_setting_buttons(this, fields)
 			core.settings:set(setting.name, new_value)
 
 		elseif setting.type == "flags" then
-			local new_value = fields["te_setting_value"]
-			for _,value in ipairs(new_value:split(",", true)) do
-				value = value:trim()
-				local possible = "," .. setting.possible .. ","
-				if not possible:find("," .. value .. ",", 0, true) then
-					this.data.error_message = fgettext_ne("\"$1\" is not a valid flag.", value)
-					this.data.entered_text = fields["te_setting_value"]
-					core.update_formspec(this:get_formspec())
-					return true
+			local values = {}
+			for _, name in ipairs(setting.possible) do
+				if checkboxes["cb_" .. name] then
+					table.insert(values, name)
+				end
+			end
+
+			checkboxes = {}
+
+			local new_value = table.concat(values, ", ")
+			core.settings:set(setting.name, new_value)
+
+		elseif setting.type == "noise_params_2d" or setting.type == "noise_params_3d" then
+			local np_flags = {}
+			for _, name in ipairs(setting.flags) do
+				if checkboxes["cb_" .. name] then
+					table.insert(np_flags, name)
 				end
 			end
+
+			checkboxes = {}
+
+			local new_value = {
+				offset = fields["te_offset"],
+				scale = fields["te_scale"],
+				spread = {
+					x = fields["te_spreadx"],
+					y = fields["te_spready"],
+					z = fields["te_spreadz"]
+				},
+				seed = fields["te_seed"],
+				octaves = fields["te_octaves"],
+				persistence = fields["te_persist"],
+				lacunarity = fields["te_lacun"],
+				flags = table.concat(np_flags, ", ")
+			}
+			core.settings:set_np_group(setting.name, new_value)
+
+		elseif setting.type == "v3f" then
+			local new_value = "("
+					.. fields["te_x"] .. ", "
+					.. fields["te_y"] .. ", "
+					.. fields["te_z"] .. ")"
 			core.settings:set(setting.name, new_value)
 
 		else
@@ -621,6 +829,16 @@ local function handle_change_setting_buttons(this, fields)
 		core.update_formspec(this:get_formspec())
 	end
 
+	if setting.type == "flags"
+			or setting.type == "noise_params_2d"
+			or setting.type == "noise_params_3d" then
+		for name, value in pairs(fields) do
+			if name:sub(1, 3) == "cb_" then
+				checkboxes[name] = value == "true"
+			end
+		end
+	end
+
 	return false
 end
 
@@ -659,6 +877,10 @@ local function create_settings_formspec(tabview, name, tabdata)
 		elseif entry.type == "key" then
 			-- ignore key settings, since we have a special dialog for them
 
+		elseif entry.type == "noise_params_2d" or entry.type == "noise_params_3d" then
+			formspec = formspec .. "," .. (current_level + 1) .. "," .. core.formspec_escape(name) .. ","
+					.. core.formspec_escape(get_current_np_group_as_string(entry)) .. ","
+
 		else
 			formspec = formspec .. "," .. (current_level + 1) .. "," .. core.formspec_escape(name) .. ","
 					.. core.formspec_escape(get_current_value(entry)) .. ","
@@ -743,7 +965,12 @@ local function handle_settings_buttons(this, fields, tabname, tabdata)
 	if fields["btn_restore"] then
 		local setting = settings[selected_setting]
 		if setting and setting.type ~= "category" then
-			core.settings:set(setting.name, setting.default)
+			if setting.type == "noise_params_2d"
+					or setting.type == "noise_params_3d" then
+				core.settings:set_np_group(setting.name, setting.default_table)
+			else
+				core.settings:set(setting.name, setting.default)
+			end
 			core.settings:write()
 			core.update_formspec(this:get_formspec())
 		end