caretaker: add plugin

README.md

@@ -53,6 +53,6 @@ Missing features
 - [ ] Simple word mappings for fun
 - ~~[ ] Lyrics~~
 - [ ] Phonétique
-- [ ] Greet other people joining
-- [ ] Mourn other people parting
+- [x] Greet other people joining
+- [x] Mourn other people parting
 - [ ] unknown questions

config.json.example

@@ -14,6 +14,14 @@
       "beers": ["Paix-Dieu"],
       "opening_text": "/me cracks open a {beer} for {target}"
     },
+    "caretaker": {
+      "warm_welcome": ["Hi {target}!"],
+      "cold_welcome": ["Oh no..."],
+      "nice_farewell": [":("],
+      "bad_farewell": ["Good riddance."],
+      "welcome_rate": 10,
+      "farewell_rate": 10
+    },
     "common": {
       "command_suffix": "please",
       "handling_conditions": {

edmond/plugins/caretaker.py

@@ -0,0 +1,49 @@
+import random
+
+from edmond.plugin import Plugin
+from edmond.plugins.mood import Mood
+from edmond.utils import proc
+
+
+class CaretakerPlugin(Plugin):
+    """Say hello and farewall on people joining/parting."""
+
+    REQUIRED_CONFIGS = [
+        "warm_welcome", "cold_welcome", "nice_farewell", "bad_farewell",
+        "welcome_rate", "farewell_rate"
+    ]
+
+    def __init__(self, bot):
+        super().__init__(bot)
+        self.mood_plugin = None
+
+    def on_welcome(self, event):
+        self.mood_plugin = self.bot.get_plugin("mood")
+
+    def on_join(self, event):
+        if event.source.nick == self.bot.nick:
+            return
+        if not proc(self.config["welcome_rate"]):
+            return
+        welcome_type = "warm_welcome"
+        if self.mood_plugin:
+            if self.get_runtime_value("mood", ns="mood") == Mood.PISSED:
+                welcome_type = "cold_welcome"
+        welcome = random.choice(self.config[welcome_type])
+        if "{target}" in welcome:
+            welcome = welcome.format(target=event.source.nick)
+        self.bot.say(event.target, welcome)
+
+    def on_part(self, event):
+        if event.source.nick == self.bot.nick:
+            return
+        if not proc(self.config["farewell_rate"]):
+            return
+        farewell_type = "nice_farewell"
+        if self.mood_plugin:
+            if self.get_runtime_value("mood", ns="mood") == Mood.PISSED:
+                farewell_type = "bad_farewell"
+        farewell = random.choice(self.config[farewell_type])
+        if "{target}" in farewell:
+            farewell = farewell.format(target=event.source.nick)
+        self.bot.say(event.target, farewell)