Add warning when trying to enable AutoDJ with left & right deck

[MetriSomesh]

Added warning message when trying to enable AutoDJ if there's no left & right deck.

[ronso0]

Please stop opening new PRs, instead follow the instructions @daschuer and I gave you and fix the original PR. This is actually trivial given the small change set.
First get familiar with how git works. Not doing that and not reading the hints git gives in the terminal and thereby implicitly` asking for help for every single step is a waste of developer time.

To be continued in #11013

[MetriSomesh]

@ronso0 Sorry about that I will not repeat my mistakes again, I understood the problem and the pre-commit was causing it I don't know how. But at the time of commit normally it ask for password, but while using pre-commit it doesn't ask any password, that's why it is causing errors

[MetriSomesh]

@ronso0 You can check this request for the checks If any error will occur I will restudy the whole github and then I will start contributing to this community

[ronso0]

Pre-commit is still failing since the indentations don't match.
You need to install pre-commit as explained in using Git https://github.com/mixxxdj/mixxx/wiki/Using-Git#set-up-automatic-code-checking
Then pre-commit will be run on the changed files when you git commit (and that will not ask for your password, only git push will)

[MetriSomesh]

@ronso0 I have installed it already. Ok I will fix this completely first then I will try to commit or to push a request thank you very much

[MetriSomesh]

@ronso0 I am sorry to disturb you again but I was looking for this from nearly 4 hours now still cant find a way to fix it

The pre-commit is giving this output:

It doesn't fixing the format just getting closed immediately after this I checked git status as well no changes are show

[ronso0]

You obviously didn't bother to read the command output. Below the red Failed it says
"Python was not found"...

[daschuer]

There is work in progress to make pre-commit on windows more robust. Please

git pull git@github.com:daschuer/mixxx.git pre-commit-python

Unfortunately this will combine the two PRs, but I can clean that up before merge.

[daschuer]

You may also report your experience in the original PR that we get it merged soon:
#11004

[ronso0]

You obviously didn't bother to read the command output. Below the red Failed it says "Python was not found"...

Ok, sorry, didn't know this is a known issue on Windows.
Please proceed as @Holzhaus suggested on Zulip https://mixxx.zulipchat.com/#narrow/stream/247620-development-help/topic/Pre-commit-help/near/306704977
Download the pre-commit patch file, apply it locally, git commit --amend and force-push.
Then this should finally be in a mergeable state.

[MetriSomesh]

@ronso0 I have followed all the steps as you followed

[MetriSomesh]

@daschuer I am sorry, I didn't opened my github because I was searching solution on the error which was given by the pre-commit. I have now seen the PR you mentioned. Now I will install and share my experience on #11004

[ronso0]

Okay, finally LGTM
@daschuer any more comments?

This is a good first step. Later on it would be nice to show a message when assign switches are changed while AutoDJ is running. Though I think this is out o scope here.

[MetriSomesh]

@ronso0 @daschuer Thank you very much for your help. I learned a lot of things while doing my first ever git request successful.

[daschuer]

LGTM, Thank you for your endurance!

Before merge, we need your permission to distribute the code with Mixxx.
Please sign https://docs.google.com/a/mixxx.org/spreadsheet/viewform?formkey=dEpYN2NkVEFnWWQzbkFfM0ZYYUZ5X2c6MQ and comment here when done. Thank you.

[MetriSomesh]

@daschuer Done

[MetriSomesh]

@ronso0 and @daschuer Thank you very much.

What is LGTM anyway ?

[daschuer]

LGTM= Looks good to me