abstract data interface

[gideonite]

Abstract the interface for data storage from anything mongodb specific,
thereby allowing for developers to more easily incorporate other
backends such as file storage and tinydb.

Basic implementation for file storage with corresponding unit tests.

For more on this change see #17.

[coveralls]

Coverage increased (+3.05%) to 74.05% when pulling 5ecdcf4 on gideonite:develop into 45e9b73 on chovanecm:develop.

[chovanecm]

Nice! Could you please enable "allow edits from maintainers" for this branch so that I can push add minor changes before merging? (I want to add / restyle docstrings and fix some of the code style warnings reported by https://travis-ci.org/chovanecm/sacredboard/jobs/239662238 in the new code.)
Alternatively, you can do it :-) And I think it's acceptable to ignore warnings for the test files.

[chovanecm]

Please include the mu variable too in order for commands like sacredboard -mu mongodb://user:pwd@host/admin?authMechanism=SCRAM-SHA-1 sacred to work.

[gideonite]

I'd be more than happy to but I don't know how to run the linter tool.

I'm pretty sure allow edits from maintainers is already on:

[coveralls]

Coverage increased (+3.05%) to 74.05% when pulling ecc2caa on gideonite:develop into 45e9b73 on chovanecm:develop.

[chovanecm]

If you still have troubles running tox (e.g. tox -e flake8), the commands for running it are defined in tox.ini.
So, for instance, flake8 sacredboard --max-complexity 10 --exclude tests checks the code style and pydocstyle sacredboard --ignore D207,D212,D301,D203 the Python code documentation. This is known to work on Windows.
Tox, unfortunately, doesn't run the second command if the first one fails, so it doesn't say anything about your documentation style if there is a problem with code style. I have to resolve it somehow, perhaps I will have to add a Makefile, but it won't work for most users on Windows either.

Also make sure to have both flake8 and pydocstyle installed (I just noticed I forgot to add them in dev-requirements.txt, so if you download the current version and run pip install -r dev-requirements.txt, it should install automatically, or simply run pip install flake8 pydocstyle).

[gideonite]

Whoops, I guess I should have pulled before I pushed. Should I pull and resolve the changes or leave that to you? The only changes I made to mongodb in this last commit relate to removing whitespace and shortening doc strings as recommended by flake8.

[chovanecm]

Conflict fixed. I have also fixed some errors and added reading of the info.json file.

Furthermore, I changed the way how the code style check for Python works.
Now, tox -e flake8 checks the code style whereas tox -e pydocstyle is responsible for code documentation checks. The reason for it is that when flake8 found errors, pydocstyle did not run at all.

[coveralls]

Coverage increased (+3.5%) to 74.513% when pulling c8f3c88 on gideonite:develop into 53ffcb4 on chovanecm:develop.

[chovanecm]

Now I'd like to ask you to consult the code documentation with tox -e pydocstyle (of course, only files that are relevant to your part).

Do you plan to add support for filtering, sorting etc? It's quite a lot of work. Otherwise, I'm thinking about extending the Web API to tell the frontend to hide the filtering and similar controls in order not to confuse the users.
Also, some error handling (file not found) etc would be nice. But for that, I have to modify the Web API.

[coveralls]

Coverage increased (+3.5%) to 74.513% when pulling ec56339 on gideonite:develop into 53ffcb4 on chovanecm:develop.

[coveralls]

Coverage increased (+3.3%) to 74.313% when pulling 804b563 on gideonite:develop into 53ffcb4 on chovanecm:develop.

[chovanecm]

"Why is m or mu compared to (None, None)?" - It's not exactly clear, I know. The reason is that the mu parameter defaults to (None, None) and when the parameter is not present on the command line, it is set to that value. So after you added "if m or mu", it was actually always evaluated as True even thought Sacredboard was run with -F.
I have to refactor the bootstrap. It's getting a little bit messy.

[gideonite]

Oh ok, sorry about that. I should have tested it more thoroughly.

Any other things that this PR is blocked on?

[chovanecm]

Not from your side. As soon as I have some time (hopefully already later this week), I'll disable all the sorting and filtering controls for backends that don't support it and I'll merge the PR.