Allow setting "application/run/disable_stdout" at runtime

[CsloudX]

Describe the project you are working on

NoGame-APP

Describe the problem or limitation you are having in your project

I'm create a console server app, and client can connect.
in my project, I have many code for debug use prints function.
when i export project, i don't want console print this info, so i set disable_std_out in ProjectSettings.
but for some info, like client connect server, client request info etc, i want print this info.

Describe the feature / enhancement and how it helps to overcome the problem or limitation

For now, the application/run/disable_stdout can't take effect on runtime:

Maybe can implement a method for this:

static func prints_smart(text, always:=false):
	if OS.has_feature("editor") or always:
		prints(text)

but there was 2 problems:

1. in my project, there was so much prints codes need update.
2. need to implement much methods like print_debug, printerr etc.
3. some info can't take effect like:
   

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

My code like this:

var disable_stdout = false

func _ready():
	if if OS.has_feature("editor"):
		disable_stdout = false
	else:
		disable_stdout = true
	ProjectSettings.set_setting("application/run/disable_stdout",disable_stdout)
	
	prints("App Start")

func print_always(text):
	if disable_stdout:
		ProjectSettings.set_setting("application/run/disable_stdout",false)
		prints(text)
		ProjectSettings.set_setting("application/run/disable_stdout",true)
	else:
		prints(text)
	

func _on_client_connect():
	print_always("client connect")

func _on_client_req_info(info):
	print_always("client req info:%s"%info)
	req_info(info)


func req_info(info):
	prints(info.id)
	prints(info.name)
	prints(info.many_info)


func quit():
	prints("quit")

If this enhancement will not be used often, can it be worked around with a few lines of script?

In the Editor, it should prints:

>App Start
>client connect
>client req info: aaa
>info.id = 564564563165
>info.name = "asfafdasdfasf"
>info.many_info = asdfasfasdf
sadfdsaf
saf
as
f
safd
>quit

For exported app, it should prints:

>App Start
>client connect
>client req info: aaa

Other a simple example:

func _ready():
	test(true)
	test(false)
	test(true)
	test(false)

func test(disable:bool):
	ProjectSettings.set_setting("application/run/disable_stdout",disable)
	if disable:
		prints("Disable, This line can't print")
	else:
		prints("Enable, This line should print")

I wish output was:

>Enable, This line should print
>Enable, This line should print

Is there a reason why this should be core and not an add-on in the asset library?

No, it should be core

[AThousandShips]

This could be done by adding a companion to Engine.print_error_messages

[AThousandShips]

Writing up some code for just that, with a property called print_to_stdout, with associated set/get, just like print_error_messages, will open a PR if it works out neatly

[KoBeWi]

You don't need to change this setting at runtime, you can add a setting override instead, to specify when it should take effect.