Settings tab: add v3f type

Add the v3f type, currently is just a nice placeholder for string.
Currently undocumented, on wish of @PilzAdam, to support future changes.

builtin/mainmenu/tab_settings.lua

@@ -112,7 +112,7 @@ local function parse_setting_line(settings, line, read_all, base_level, allow_se
 	end
 
 	if setting_type == "string" or setting_type == "noise_params"
-			or setting_type == "key" then
+			or setting_type == "key" or setting_type == "v3f" then
 		local default = remaining_line:match("^(.*)$")
 
 		if not default then
@@ -381,6 +381,9 @@ local function create_change_setting_formspec(dialogdata)
 		formspec = formspec .. ",,"
 				.. "," .. fgettext("Format: <offset>, <scale>, (<spreadX>, <spreadY>, <spreadZ>), <seed>, <octaves>, <persistence>") .. ","
 				.. "," .. fgettext("Optionally the lacunarity can be appended with a leading comma.") .. ","
+	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
@@ -424,7 +427,7 @@ local function create_change_setting_formspec(dialogdata)
 				.. "button[8,3.75;2,1;btn_browser_path;" .. fgettext("Browse") .. "]"
 
 	else
-		-- TODO: fancy input for float, int, flags, noise_params
+		-- TODO: fancy input for float, int, flags, noise_params, v3f
 		local width = 10
 		local text = get_current_value(setting)
 		if dialogdata.error_message then

builtin/settingtypes.txt

@@ -941,15 +941,11 @@ mgfractal_spflags (Mapgen fractal flags) flags nojulia julia,nojulia
 mgfractal_m_iterations (Mapgen fractal mandelbrot iterations) int 9
 
 #    Mandelbrot set: Approximate (X,Y,Z) scales in nodes.
-#    Format is 3 numbers separated by commas and inside brackets.
-mgfractal_m_scale (Mapgen fractal mandelbrot scale) string (1024.0, 256.0, 1024.0)
-#    Type 'string' is currently used for a v3f.
+mgfractal_m_scale (Mapgen fractal mandelbrot scale) v3f (1024.0, 256.0, 1024.0)
 
 #    Mandelbrot set: (X,Y,Z) offsets from world centre.
-#    Format is 3 numbers separated by commas and inside brackets.
 #    Range roughly -2 to 2, multiply by m_scale for offsets in nodes.
-mgfractal_m_offset (Mapgen fractal mandelbrot offset) string (1.75, 0.0, 0.0)
-#    Type 'string' is currently used for a v3f.
+mgfractal_m_offset (Mapgen fractal mandelbrot offset) v3f (1.75, 0.0, 0.0)
 
 #    Mandelbrot set: W co-ordinate of the generated 3D slice of the 4D shape.
 #    Range roughly -2 to 2.
@@ -960,15 +956,11 @@ mgfractal_m_slice_w (Mapgen fractal mandelbrot slice w) float 0.0
 mgfractal_j_iterations (Mapgen fractal julia iterations) int 9
 
 #    Julia set: Approximate (X,Y,Z) scales in nodes.
-#    Format is 3 numbers separated by commas and inside brackets.
-mgfractal_j_scale (Mapgen fractal julia scale) string (2048.0, 512.0, 2048.0)
-#    Type 'string' is currently used for a v3f.
+mgfractal_j_scale (Mapgen fractal julia scale) v3f (2048.0, 512.0, 2048.0)
 
 #    Julia set: (X,Y,Z) offsets from world centre.
-#    Format is 3 numbers separated by commas and inside brackets.
 #    Range roughly -2 to 2, multiply by j_scale for offsets in nodes.
-mgfractal_j_offset (Mapgen fractal julia offset) string (0.0, 1.0, 0.0)
-#    Type 'string' is currently used for a v3f.
+mgfractal_j_offset (Mapgen fractal julia offset) v3f (0.0, 1.0, 0.0)
 
 #    Julia set: W co-ordinate of the generated 3D slice of the 4D shape.
 #    Range roughly -2 to 2.