XDG Cache and Data and State directories not supported, causing data to be stored in the wrong directories on Linux and Mac.

[kothawoc]

Checklist

• I have searched the issue tracker for open issues that relate to the same feature, before opening a new one.
• This issue only relates to a single feature. I will open new issues for any other features.

Is your feature request related to a problem?

According to the XDG spec, I should be able to use cache and data directories.
https://specifications.freedesktop.org/basedir-spec/latest/index.html

This is also an issue for Macs too, but with their standards at:
https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPFileSystem/Articles/WhereToPutFiles.html

Is it possible to construct a solution with the existing API?

I don't believe so.

Describe the solution you'd like to see.

I think it would be sensible to some additional APIs used for these, rather than the existing myApp.Storage().RootURI().Path(), possibly have a CacheURI, ConfigURI, DataURI and StateURI.
I believe the RootURI could point at the ConfigURI for the current version so as to be 100% compatable. And the RootURI could be deprecated in v3 or when desired if you wish. For other platforms, they can just point at the same place.

[dweymouth]

To add to this, I wonder if the app storage directories should just be created at the root with the appID (~/.config/com.someapp/, ~/.cache/com.someapp/, etc) instead of being nested under a fyne directory. Users who go looking for the config files (linux users often do this) may not find it since they're not expecting it to be under a fyne directory

[andydotxyz]

I'm not sure how this applies to macOS?

[kothawoc]

When discussing the issue on discord, @dweymouth pointed out that the location was an issue on Macs too:

yeah new APIs could use a new location. A cache API would be especially handy to store things in ~/.cache/... and ~/Library/Caches/... (Mac)

The XDG standard places don't apply to Macs, that information can be found at:
https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPFileSystem/Articles/WhereToPutFiles.html

I just mentioned Macs as @dweymouth mentioned them, I can update the issue to reflect the Mac stuff, or remove it?

[andydotxyz]

I just mentioned Macs as @dweymouth mentioned them, I can update the issue to reflect the Mac stuff, or remove it?

Well, the title mentions it but the body does not explain. If the source is a chat elsewhere the relevant info should have be pasted in here for people to follow. I can see from the document that cache applies to both. Not sure about data or state on Mac.

To add to this, I wonder if the app storage directories should just be created at the root with the appID

Just be sure we don't simply change location in an upgrade - would result in a lot of lost data.