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lua/includes/modules/cvars.lua

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+--[[
+| This file was obtained through the combined efforts
+| of Madbluntz & Plymouth Antiquarian Society.
+|
+| Credits: lifestorm, Gregory Wayne Rossel JR.,
+| 	Maloy, DrPepper10 @ RIP, Atle!
+|
+| Visit for more: https://plymouth.thetwilightzone.ru/
+--]]
+
+
+local table				= table
+local type				= type
+local istable 			= istable
+local isstring			= isstring
+local assert			= assert
+local format			= string.format
+local GetConVar			= GetConVar
+
+--[[---------------------------------------------------------
+	Name: cvar
+	Desc: Callbacks when cvars change
+-----------------------------------------------------------]]
+module( "cvars" )
+
+local ConVars = {}
+
+--[[---------------------------------------------------------
+	Name: GetConVarCallbacks
+	Desc: Returns a table of the given ConVars callbacks
+-----------------------------------------------------------]]
+function GetConVarCallbacks( name, createIfNotFound )
+
+	local tab = ConVars[ name ]
+	if ( createIfNotFound and !tab ) then
+		tab = {}
+		ConVars[ name ] = tab
+	end
+
+	return tab
+
+end
+
+--[[---------------------------------------------------------
+	Name: OnConVarChanged
+	Desc: Called by the engine
+-----------------------------------------------------------]]
+function OnConVarChanged( name, old, new )
+
+	local tab = GetConVarCallbacks( name )
+	if ( !tab ) then return end
+
+	for i = 1, #tab do
+		local callback = tab[ i ]
+		if ( istable( callback ) ) then
+			callback[ 1 ]( name, old, new )
+		else
+			callback( name, old, new )
+		end
+	end
+
+end
+
+--[[---------------------------------------------------------
+	Name: AddChangeCallback
+	Desc: Adds a callback to be called when convar changes
+-----------------------------------------------------------]]
+function AddChangeCallback( name, func, identifier )
+
+	if ( identifier ) then
+		assert( isstring( identifier ), format( "bad argument #%i (string expected, got %s)", 3, type( identifier ) ) )
+	end
+
+	local tab = GetConVarCallbacks( name, true )
+
+	if ( !identifier ) then
+		table.insert( tab, func )
+		return
+	end
+
+	for i = 1, #tab do
+		local callback = tab[ i ]
+		if ( istable( callback ) and callback[ 2 ] == identifier ) then
+			callback[ 1 ] = func
+			return
+		end
+	end
+
+	table.insert( tab, { func, identifier } )
+
+end
+
+--[[---------------------------------------------------------
+	Name: RemoveChangeCallback
+	Desc: Removes callback with identifier
+-----------------------------------------------------------]]
+function RemoveChangeCallback( name, identifier )
+
+	if ( identifier ) then
+		assert( isstring( identifier ), format( "bad argument #%i (string expected, got %s)", 2, type( identifier ) ) )
+	end
+
+	local tab = GetConVarCallbacks( name, true )
+	for i = 1, #tab do
+		local callback = tab[ i ]
+		if ( istable( callback ) and callback[ 2 ] == identifier ) then
+			table.remove( tab, i )
+			break
+		end
+	end
+
+end
+
+--[[---------------------------------------------------------
+	Name: String
+	Desc: Retrieves console variable as a string
+-----------------------------------------------------------]]
+function String( name, default )
+
+	local convar = GetConVar( name )
+	if ( convar ~= nil ) then
+		return convar:GetString()
+	end
+
+	return default
+
+end
+
+--[[---------------------------------------------------------
+	Name: Number
+	Desc: Retrieves console variable as a number
+-----------------------------------------------------------]]
+function Number( name, default )
+
+	local convar = GetConVar( name )
+	if ( convar ~= nil ) then
+		return convar:GetFloat()
+	end
+
+	return default
+
+end
+
+--[[---------------------------------------------------------
+	Name: Bool
+	Desc: Retrieves console variable as a boolean
+-----------------------------------------------------------]]
+function Bool( name, default )
+
+	local convar = GetConVar( name )
+	if ( convar ~= nil ) then
+		return convar:GetBool()
+	end
+
+	return default
+
+end