Happi

===================

Bugfixes
--------
- Do not raise an exception on single malformed entries uncovered during
a search. Treat these as missing entries. This was causing an issue
where queries like ``all_devices`` would fail outright.
- Fix issue where ``device_cls`` string would leak through and raise a
bad/confusing exception during ``create_device``

Maintenance
-----------
- Reduce missing backends log messages from ``warning`` to ``debug``.
- Fix docs failing to build and related issues.
- Add ``requirements.txt`` file to ``MANIFEST.in``.

* LCLS-specific containers are moved out of happi, and into [pcdsdevices](https://github.com/pcdshub/pcdsdevices/tree/master/pcdsdevices/happi)
* `OphydItem` is now the preferred "basic" `ophyd.Device` container, with the intention of fully deprecating `Device` to avoid naming confusion
* Minor internal fixes

* Refactor search methods, supporting mongo and JSON backends
- `search` - search by key/value pairs as kwargs
- `search_range` - search for a range of values in a specific key
- `search_regex` - search for key/value pairs as kwargs, with values being regular expressions
- Adds `SearchResult` container, allowing for access of metadata or device instantiation
* `Client['item']` supported
* `happi.Device` is now marked as deprecated
- Migrate to `happi.OphydItem`
* Documentation building fixed and made more accurate
* Internal refactoring
- Reduce usage of metaclasses
- pymongo/mongomock are truly optional test dependencies now
- Added pre-commit configuration for developer quality-of-life
- `HappiItem`s are now `copy.copy()`-able
- Backends supply generators and not lists
* Fixed many oustanding issues with the JSON backend

Enhancements
- Add an add command for cli, e.g. happi add to start an interactive device adder
- Add an edit command for cli, e.g. happi edit im3l0 location=750 prefix=IM3L0:PPM
- Change search command syntax to be simpler (more like edit)
- Add a load command for cli, e.g. happi load im3l0 im1l1 -> IPython session
plus other changes made in dev to "get it working"
- Add two new Happi-aware Qt widgets: HappiDeviceListView & HappiDeviceTreeView


Bug Fixes
- Initialize database if it does not yet exists
- Fix broken tests

Enhancements

* Command line script allow users to search and add devices 84
* Base `Container` object now available with minimum amount of `EntryInfo` 92
* Allow Happi to load more devices from LCLS questionnaire 94
* New function `list_choices` added to `happi.Client` to allow user to know what beamlines, prefixes, names, etc. will return results.
* Threaded `load_devices` with option to specify a callback when devices are ready 67

Bug Fixes

* The test suite now passes without the `mongomock` backend (89)
* Ensure our file handles are properly closed in the JSON backend by using context managers (87)