Adhere to XDG base directory spec

[retnikt]

Currently, on Linux, Dart stores some data in ~/.dart and ~/.dartServer, which is annoying because it clutters up the user's home directory. Please consider following the XDG Base Directory spec by moving these files to appropriate locations specified in the environment variables $XDG_CONFIG_HOME, $XDG_DATA_HOME, and $XDG_CACHE_HOME. (typically, and by default, ~/.config, ~/.local/share, and ~/.cache).

• Dart SDK Version (dart --version) = 2.7.2
• Applies to Linux only

[devoncarew]

I'm not aware of how widely used this XDG directory spec is. Following common pattens would be useful, if these are common patterns; I have not previously heard of this convention.

cc @kevmoo @bwilkerson @jonahwilliams for thoughts

[bwilkerson]

I hadn't heard of it either, but then it's well outside my wheelhouse. Personally I have no preference about where we store cached files.

[kevmoo]

https://maex.me/2019/12/the-power-of-the-xdg-base-directory-specification/ TIL

…

On Sun, Apr 19, 2020, 08:35 Brian Wilkerson ***@***.***> wrote: I hadn't heard of it either, but then it's well outside my wheelhouse. Personally I have no preference about where we store cached files. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#41560 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAEFCWHMJQA6BDHS7NACWLRNMK3NANCNFSM4MLHM7DA> .

[kevmoo]

@devoncarew @bwilkerson – I'm a fan of following conventions and not dirtying up directories.

If at some point, if we want to entertain moving things around I'm not against this. 🤷

[bwilkerson]

I'm not against it either. The first question is how to prioritize this against the other work that needs to be done.

[retnikt]

Here is a partial list of applications that have adopted it:
https://wiki.archlinux.org/index.php/XDG_Base_Directory#Supported

They include:

• git
• KDE
• GTK
• LibreOffice
• NeoVim

To name some of the more notable ones

[hildebro]

Any update on the priority of this issue?

[Jaakkonen]

The .dart folder is hard-coded in https://github.com/dart-lang/sdk/blob/master/pkg/dartdev/lib/src/analytics.dart and .dartServer in https://github.com/dart-lang/sdk/blob/master/pkg/analyzer/lib/file_system/physical_file_system.dart and https://github.com/dart-lang/sdk/blob/master/pkg/analysis_server/benchmark/benchmarks.dart
These foldernames don't appear seem to appear elsewhere in the codebase so making a PR should be doable :)
I think approaching this with following kind of implementation would be good:

• conf_dir = (env["XDG_CONFIG_HOME"] || env["HOME"]+"/.config")+"/dart"
• If conf_dir/CONFFILE exists, use it
• Else check if old file exists and use it
• Else (neither files exist) create default file to conf_dir.

Moving the conf file to the new location automatically is pretty nice too but will annoy some people using dotfile managers when their dotfiles have changed on their own.

For caching files, it's already possible to set pub to use other cache dir than ~/.pub-cache with PUB_CACHE environment variable. Logic here: https://github.com/dart-lang/sdk/blob/master/pkg/nnbd_migration/tool/src/package.dart#L32
I think this should use $XDG_CACHE_HOME/pub as default, $HOME/.cache/pub as 1st fallback (XDG default) and the $HOME/.pub-cache as 2nd fallback.

The XDG spec is being adopted in Flutter here: flutter/flutter#59430
It'd be nice to have it in dart too :)

[Surendrajat]

Any update on this one? Is it being considered?

[jiampong212]

any updates? The XDG convention makes it easier to organize files and not clutter the home directory. I know it may not be the top priority, but it would certainly help if you guys would implement it.