Prettify function tostring (#2870)

* Prettify function tostring

* E2Descriptions

* Change definition style

* Change

* Add function to table print

lua/entities/gmod_wire_expression2/core/e2lib.lua

@@ -77,6 +77,10 @@ end
 local Function = {}
 Function.__index = Function
 
+function Function:__tostring()
+	return "function(" .. self.arg_sig .. ")" .. ((self.ret and (": " .. self.ret)) or "")
+end
+
 function Function.new(args, ret, fn)
 	return setmetatable({ arg_sig = args, ret = ret, fn = fn }, Function)
 end

lua/entities/gmod_wire_expression2/core/functions.lua

@@ -44,4 +44,10 @@ __e2setcost(1)
 
 e2function string function:getReturnType()
 	return this.ret or ""
-end
+end
+
+e2function string toString(function func)
+	return tostring(func)
+end
+
+e2function string function:toString() = e2function string toString(function func)

lua/entities/gmod_wire_expression2/core/table.lua

@@ -173,6 +173,7 @@ local tostring_typeid = {
 	xm2 = 	tostrings.table,
 	a = 	tostrings.Vector,
 	xv4 = 	tostrings.Vector4,
+	f =		tostring
 }
 
 local function checkAbort( ret, cost, abortafter )

lua/wire/client/e2descriptions.lua

@@ -1762,3 +1762,8 @@ E2Helper.Descriptions["takeDamage(e:ne)"] = "Applies an amount of damage to the
 E2Helper.Descriptions["takeDamage(e:nee)"] = "Applies an amount of damage to the player with given attacker and inflictor. Requires wire_expression2_damage_enabled to be set to 1."
 
 E2Helper.Descriptions["blastDamage(vnn)"] = "Creates blast damage at the position provided with specified radius and damage amount. Requires wire_expression2_damage_enabled to be set to 1."
+
+-- Functions
+
+E2Helper.Descriptions["getParameterTypes(f:)"] = "Returns an array of the parameter typeids of the function"
+E2Helper.Descriptions["getReturnType(f:)"] = "Returns the return typeid of the function"