Updated the keyvalue REPL utility module

fish2000 · fish2000 · commit 7afb616cf5ce · 2019-06-18T11:21:40.000-04:00
... which it now properly uses both the new “appdirectories” thing,
    and also employs the `replutilities.NoDefault` singleton object
    to differentiate between calling “get('key', default=None)” and
    just doing “get('key')” – the latter of which will raise when
    'key' is AWOL instead of returning `None`.
diff --git a/.script-bin/keyvalue.py b/.script-bin/keyvalue.py
@@ -7,7 +7,7 @@
 
 import appdirectories as appdirs
 from replutilities import attr, isstring, isbytes
-from replutilities import Exporter
+from replutilities import Exporter, NoDefault
 
 exporter = Exporter()
 export = exporter.decorator()
@@ -53,21 +53,22 @@ class ReplEnvDirs(appdirs.AppDirs):
     
     def __init__(self):
         """ Initialize with a fixed “appname” parameter `replenv` """
-        super(ReplEnvDirs, self).__init__(appname='replenv')
-        self.mode = 'linux' # use Linux directory layout
+        # use Linux directory layout:
+        super(ReplEnvDirs, self).__init__(appname='replenv',
+                                          system='linux')
     
     @property
     def mode(self):
         """ The “appdirs.system” global module variable controls the
             operation of the properties of all `appdirs.AppDirs` instances.
         """
-        return appdirs.system
+        return self.system
     
     @mode.setter
     def mode(self, value):
         if value not in ('darwin', 'linux'):
             raise ValueError("invalid mode: %s" % value)
-        appdirs.system = value
+        self.system = value
     
     @property
     def site_config(self):
@@ -124,14 +125,14 @@ def count():
     return len(zfunc)
 
 @export
-def get(key, default_value=None):
+def get(key, default=NoDefault):
     """ Return a value from the ReplEnv user-config key-value store. """
-    if not key:
-        return default_value
+    if default is NoDefault:
+        return zfunc[key]
     try:
         return zfunc[key]
     except KeyError:
-        return default_value
+        return default
 
 @export
 def set(key, value):
