Demonstration of using the proposed astropy custom config stuff

dkist/_dkist_init.py

@@ -45,10 +45,12 @@
         if os.path.isfile(config_template):
             try:
                 update_default_config(
-                    __package__, config_dir, version=__version__)
+                    __package__, config_dir, version=__version__,
+                    rootname='dkist')
             except TypeError as orig_error:
                 try:
-                    update_default_config(__package__, config_dir)
+                    update_default_config(__package__, config_dir,
+                                          rootname='dkist')
                 except ConfigurationDefaultMissingError as e:
                     wmsg = (e.args[0] +
                             " Cannot install default profile. If you are "

dkist/config/__init__.py

@@ -0,0 +1,9 @@
+import astropy.config as astropyconfig
+
+
+class ConfigNamespace(astropyconfig.ConfigNamespace):
+    rootname = 'dkist'
+
+
+class ConfigItem(astropyconfig.ConfigItem):
+    rootname = 'dkist'

dkist/dkist.cfg

@@ -0,0 +1,3 @@
+[io]
+## Name of Preferred fits module
+# preferred_fits_library = 'astropy'

dkist/io/__init__.py

@@ -1,3 +1,20 @@
 from .fits import BaseFITSLoader, AstropyFITSLoader
 from .reference_collections import (BaseFITSArrayContainer, DaskFITSArrayContainer,
                                     NumpyFITSArrayContainer)
+__all__ = ['BaseFITSLoader', 'AstropyFITSLoader', 'BaseFITSArrayContainer',
+           'NumpyFITSArrayContainer', 'DaskFITSArrayContainer', 'conf']
+
+
+import dkist.config as _config
+
+
+class Conf(_config.ConfigNamespace):
+    """
+    Configuration Parameters for the IO Package.
+    """
+
+    preferred_fits_library = _config.ConfigItem('astropy',
+                                                "Name of the preferred FITS module.")
+
+
+conf = Conf()