Automatically format example text for OptionsSetting (showing options)

modules/channel_op.py

@@ -20,8 +20,7 @@ class InvalidTimeoutException(Exception):
     "Set ban format ($n = nick, $u = username, $h = hostname)",
     example="*!$u@$h"))
 @utils.export("serverset", utils.OptionsSetting("mute-method",
-    ["qmode", "insp", "unreal"], "Set this server's method of muting users",
-    example="qmode"))
+    ["qmode", "insp", "unreal"], "Set this server's method of muting users"))
 class Module(ModuleManager.BaseModule):
     _name = "ChanOp"
 

modules/config.py

@@ -84,7 +84,7 @@ class Module(ModuleManager.BaseModule):
             if setting_info:
                 value = target.get_setting(require_setting, None)
                 if value == None:
-                    example = setting_info.exaple or "<value>"
+                    example = setting_info.get_example() or "<value>"
                     return "Please set %s, e.g.: %sconfig %s %s %s" % (
                         require_setting, event["command_prefix"], context[0],
                         require_setting, example)
@@ -180,9 +180,9 @@ class Module(ModuleManager.BaseModule):
             try:
                 result = self._config(export_settings, target, setting, value)
             except ConfigInvalidValue:
-                example = export_settings[setting].example
+                example = export_settings[setting].get_example()
                 if not example == None:
-                    raise utils.EventError("Invalid value. Example: %s" %
+                    raise utils.EventError("Invalid value. %s" %
                         example)
                 else:
                     raise utils.EventError("Invalid value")

modules/permissions/__init__.py

@@ -10,8 +10,8 @@ REQUIRES_IDENTIFY_INTERNAL = ("You need to be identified to use that command "
  "(/msg %s register | /msg %s identify)")
 
 @utils.export("serverset", utils.OptionsSetting("identity-mechanism",
-    ["internal", "ircv3-account"], "Set the identity mechanism for this server",
-    example="ircv3-account"))
+    ["internal", "ircv3-account"],
+    "Set the identity mechanism for this server"))
 class Module(ModuleManager.BaseModule):
     @utils.hook("new.user")
     def new_user(self, event):

src/utils/__init__.py

@@ -230,13 +230,23 @@ def is_main_thread() -> bool:
     return threading.current_thread() is threading.main_thread()
 
 class Setting(object):
+    example: str = None
     def __init__(self, name: str, help: str=None, example: str=None):
         self.name = name
         self.help = help
+        if not example == None:
             self.example = example
     def parse(self, value: str) -> typing.Any:
         return value
 
+    def get_example(self):
+        if not self.example == None:
+            return "Example: %s" % self.example
+        else:
+            return self._format_example()
+    def _format_example(self):
+        return None
+
 SETTING_TRUE = ["true", "yes", "on", "y"]
 SETTING_FALSE = ["false", "no", "off", "n"]
 class BoolSetting(Setting):
@@ -269,3 +279,7 @@ class OptionsSetting(Setting):
             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)