- Add support for reading configuration values from environment variables (see EnvSource).
- Resolve a possible race condition when creating configuration directories.
- A new Configuration.reload method makes it convenient to reload and re-parse all YAML files from the file system.
- A new MappingValues template behaves like Sequence but for mappings with arbitrary keys.
- A new Optional template allows other templates to be null.
- Filename templates now have an option to resolve relative to a specific directory. Also, configuration sources now have a corresponding global option to resolve relative to the base configuration directory instead of the location of the specific configuration file.
- There is a better error message for Sequence templates when the data from the configuration is not a sequence.
- pathlib.PurePath objects can now be converted to Path templates.
- AttrDict now properly supports (over)writing attributes via dot notation.
- Break up the confuse module into a package. (All names should still be importable from confuse.)
- When using None as a template, the result is a value whose default is None. Previously, this was equivalent to leaving the key off entirely, i.e., a template with no default. To get the same effect now, use confuse.REQUIRED in the template.
- float values (like
4.2) can now be used in templates (just like42works as an int template). - The Filename and Path templates now correctly accept default values.
- It's now possible to provide custom PyYAML Loader objects for parsing config files.
- A new
Pathtemplate produces a pathlib Path object. - Drop support for Python 3.4 (following in the footsteps of PyYAML).
- String templates support environment variable expansion.
The first stable release, and the first that beets depends on externally.