[SOLVED] I can't figure out what "from" does after a call command

[Chekhov]

So I'm going through some old code I've written and at some point I changed a simple call into a call that includes a from.

I have no idea what this does or why I did that.

The page about "call" seems to have no documentation about it: https://www.renpy.org/doc/html/label.html

Code: Select all

        call happyday from _happyday

Anyone know what this does, or what problem it solves?

[Imperf3kt]

Its not something you did, that is something Ren'Py does automatically.
I'm not entirely sure what its purpose is, but I think it has something to do with the call stack.

[Chekhov]

Thank you Imperf3kt, you just saved me days of worrying about it.

[rames44]

As I understand it, Ren’py makes use of labels as part of its save/load logic in order to help handle situations when a save is made with one script and then loaded using an edited script. Essentially, depending on the nature of the changes, Ren’py will roll back until it’s happy it’s back in sync. The “call from” essentially provides Ren’py with a label associated with the “call” statement to help that process, so that it can “back itself out” of the call if required and know where it is. Bad description, perhaps, but that’s more or less what those are in there for.

When you create a distribution, by default Ren’py will add the “from” clauses to your code automatically. (There’s an option for this on the build screen, if you look for it.) You can disable this option if you want, but it’s not a good idea...

[Chekhov]

That is a pretty good explanation Rames, thanks.