player: set default cache dir on macOS

[m154k1]

Since shader/icc caches are enabled by default now ~/.config/mpv may contain a lot of cache files on macOS. Most likely, users want to have only configuration files here so change default cache path to macOS specific directory.

[Dudemanguy]

Should probably be after #11918. Instead of modifying that section in mpv.rst. It would probably be better to make a separate FILES ON MACOS part like how there is one for Windows. Also cc @Akemi.

[Akemi]

i totally don't see a reason to use any env variables completely specific to linux and have nothing to do with any specifications of macOS.

we rejected such changes previously. either we do it properly and migrate all paths to macOS conventions, which in return will raise the ire of one group of mac users, or do it completely as linux, which will raise the ire of the other group.

either we don't change anything or do it properly the macOS way. a half assed middle way is imo something we should not desire. personally i always wanted to change everything to the macOS standard ways but was also stopped back in the days.

changing everything also might have the side effect of breaking all existing configs/setups.

[Dudemanguy]

Yeah I dunno about the environment variables and if anyone actually uses them on macOS. I don't think adding at least a cache directory hurts. I don't think anybody wants cache in their config (and it wasn't there before).

[m154k1]

@Akemi Hmm. If we choose to fully switch to macOS conventions, how the paths should look like? Maybe something like this:
~~home = ~/Library/Application Support/io.mpv/config
~~cache = ~/Library/Caches/io.mpv
~~state = ~/Library/Application Support/io.mpv/state

Or just implement only cache dir for now like @Dudemanguy suggested?

[m154k1]

I've removed env variables (except config one which was there before) and set ~~cache to ~/Library/Caches/io.mpv. Probably should be fine for now. If it's ok I'll update doc after #11918.

[m154k1]

@Akemi @Dudemanguy I've updated the doc. Please, let me know if it's ok to go with only cache dir change. This shouldn't harm users and allow us to implement other macOS-specific dirs in future.

[m154k1]

@Dudemanguy updated, thank you :)

[Dudemanguy]

LGTM, @Akemi is this sensible to you?

[Akemi]

@Akemi Hmm. If we choose to fully switch to macOS conventions, how the paths should look like? Maybe something like this:
~~home = ~/Library/Application Support/io.mpv/config
~~cache = ~/Library/Caches/io.mpv
~~state = ~/Library/Application Support/io.mpv/state

if we ever do this this seems okay.

LGTM, @Akemi is this sensible to you?

yes this is very reasonable. the cache files shouldn't be in the config dir at all.

just mentioning it, i don't have a working mac right now and can't test anything. so this would need merging without testing from my side.

[Dudemanguy]

@m154k1: Thanks for taking care of this!