Quieter deprecation warnings, at least for `beet completion`

[45054]

https://bbs.archlinux.org/viewtopic.php?id=195893

The warning should only be displayed when beets itself is started. As of now with every start of bash the warning message is shown without any hint where it originates from.

[sampsyo]

That's very strange—we actually already do this:

The warning should only be displayed when beets itself is started.

The message is printed when beets starts. It must be the case, somehow, that beets was starting every time bash started. Do you have any clues as to why that would be the case?

[45054]

Apparently, this problem only occures, when the bash-completion package is installed. Maybe it is an Arch bug, as the feature was introduced via this commit: https://projects.archlinux.org/svntogit/community.git/commit/trunk?h=packages/beets&id=c0da9b9e41da2424948173d485621175d0ef4083

[sampsyo]

Ah, I see—yes, that's running beet completion every time the shell starts up. That's fine, I suppose, but it's not something I expected. Aside from perhaps leaking some output to the console like this, it also can take some time since spinning up the Python interpreter can be slow.

Instead of (or in addition to) asking the packagers not to install the completion script by default, we could make the beet completion command very quiet by default so that warnings are never printed. Or we could just turn off this warning by default—it's not particularly critical that people migrate!

[dimsuz]

I wanted to open an issue, but it seems that my problem belongs here too.
I too come from Arch Linux where beet completion is starting on each shell login.
But in my case beet's blb file is stored on an external drive which is not always mounted.

So after recent upgrade to version 1.3.11 I started seeing this:

error: database file /var/run/media/dima/Home/dima/data/musiclibrary.blb could not be opened

I guess in this case beets should simply not even try to open this file, or accept failure.

[dimsuz]

Hmm, actually it is a bit worse: without this file in sight I cannot even run diagnostic commands like
beet --version or beet --help

It throws this error and immediately quits.

Should I create a separate issue?

[sampsyo]

OK, that's another argument for quieter output in commands that might be run at shell startup. (I'd still recommend that people dump the beet completion output to a file and source it, though, since regenerating it each time could be slow.)

And yes, please do open another issue—it does seem like a good idea to let commands like version and help work without opening the database. I'm not yet sure how we'll actually accomplish that, but it does seem like a good goal. 😃

[dimsuz]

Yeah, 'eval'-ing beet completion on shell start up seems like a bad idea. I think this is questionable decision made by whoever created an AUR (=unofficial) beets package for Arch Linux.

As for the second thing, created an issue #1415.
Unforutnately I can't create a PR or assist otherwise, because I don't know Python (atm)

[alucryd]

Apologies for the noise, I got a complaint from someone who thought adding one line to his .bashrc was too much of a hassle :P Adding that one line in /etc/bash_completion.d seemed like the only way to have bash completion enabled by default while taking enabled plugins into account, I went with it since I didn't experience issues, but obviously there are some. Just reverted that change in our repos, sometimes laziness is just not right ;)

[brunal]

@alucryd another solution is sourcing "beet completion" upon a request for completion. I had that at some point but not anymore. This seems to work:

_load_beet_completion() { eval "$(beet completion)"; }
complete -F _load_beet_completion beet

So the first time the user enters "beet " the completion will be produced and replace _load_beet_completion as the complete function.

@sampsyo
Maybe that in this case the warning shouldn't be displayed. This would simply be setting the warning behaviour in the completion function. I'll take care of it.

[brunal]

Well actually I'm not sure I can take care of it: warnings/not critical logs should be silenced when we want to print completion → in beets.ui.commands.print_completion(). However this is triggered way after we read the config, open the library & co.! I don't really see an easy way to solve that.