Implemnt _options_factory for OptionsSetting to have dynamic options

modules/shorturl.py

@@ -6,10 +6,6 @@ from src import ModuleManager, utils
 
 URL_BITLYSHORTEN = "https://api-ssl.bitly.com/v3/shorten"
 
-@utils.export("serverset", utils.Setting("url-shortener",
-    "Set URL shortener service", example="bitly"))
-@utils.export("botset", utils.Setting("url-shortener",
-    "Set URL shortener service", example="bitly"))
 class Module(ModuleManager.BaseModule):
     def on_load(self):
         self.exports.add("shorturl", self._shorturl)
@@ -17,6 +13,16 @@ class Module(ModuleManager.BaseModule):
 
         self.exports.add("shorturl-s-bitly", self._bitly)
 
+        setting = utils.OptionsSetting("url-shortener",
+            "Set URL shortener service",
+            options_factory=self._shorturl_options_factory)
+        self.exports.add("serverset", setting)
+        self.exports.add("botset", setting)
+
+    def _shorturl_options_factory(self):
+        shorteners = self.exports.find("shorturl-s-")
+        return [s.replace("shorturl-s-", "", 1) for s in shorteners]
+
     def _get_shortener(self, name):
         return self.exports.get_one("shorturl-s-%s" % name, None)
     def _call_shortener(self, shortener_name, url):

src/Exports.py

@@ -26,8 +26,10 @@ class Exports(object):
             self._context_exports[context][setting].append(value)
 
     def _get_keys(self):
-        return set(list(self._exports.keys())
-            +list(self._context_exports.keys()))
+        keys = list(self._exports.keys())
+        for context in self._context_exports.keys():
+            keys += list(self._context_exports[context].keys())
+        return list(set(keys))
 
     def get_all(self, setting: str) -> typing.List[typing.Any]:
         return self._exports.get(setting, []) + sum([
@@ -38,13 +40,12 @@ class Exports(object):
         values = self.get_all(setting)
         return values[0] if values else default
 
-    def find_one(self, setting_prefix: str, default: typing.Any=None
-            ) -> typing.Optional[typing.Any]:
-        keys = self._get_keys()
-        for key in keys:
+    def find(self, setting_prefix: str) -> typing.List[typing.Any]:
+        found = []
+        for key in self._get_keys():
             if key.startswith(setting_prefix):
-                return key
-        return default
+                found.append(key)
+        return found
 
     def purge_context(self, context: str):
         if context in self._context_exports:
@@ -62,3 +63,5 @@ class ExportsContext(object):
     def get_one(self, setting: str, default: typing.Any=None
             ) -> typing.Optional[typing.Any]:
         return self._parent.get_one(setting, default)
+    def find(self, setting_prefix: str) -> typing.List[typing.Any]:
+        return self._parent.find(setting_prefix)

src/utils/__init__.py

@@ -230,7 +230,7 @@ def is_main_thread() -> bool:
     return threading.current_thread() is threading.main_thread()
 
 class Setting(object):
-    example: str = None
+    example: typing.Optional[str] = None
     def __init__(self, name: str, help: str=None, example: str=None):
         self.name = name
         self.help = help
@@ -269,17 +269,26 @@ class IntSetting(Setting):
 
 class OptionsSetting(Setting):
     def __init__(self, name: str, options: typing.List[str], help: str=None,
-            example: str=None):
+            example: str=None,
+            options_factory: typing.Callable[[], typing.List[str]]=None):
         self._options = options
+        self._options_factory = options_factory
         Setting.__init__(self, name, help, example)
 
+    def _get_options(self):
+        if not self._options_factory == None:
+            return self._options_factory()
+        else:
+            return self._options
+
     def parse(self, value: str) -> typing.Any:
         value_lower = value.lower()
-        for option in self._options:
+        for option in self._get_options():
             if option.lower() == value_lower:
                 return option
         return None
 
     def _format_example(self):
-        options = ["'%s'" % option for option in self._options]
-        return "Options: %s" % ", ".join(options)
+        options = self._get_options()
+        options_str = ["'%s'" % option for option in options]
+        return "Options: %s" % ", ".join(options_str)