wikipedia: fix messages too long

For now it's only used by the Wikipedia plugin but it should probably be
moved elsewhere quickly!

edmond/plugins/tests/test_wikipedia.py

@@ -0,0 +1,14 @@
+import unittest
+
+from ..wikipedia import WikipediaPlugin
+
+
+class TestWikipediaPlugin(unittest.TestCase):
+    def test_limit_text_length(self):
+        text = "lorem ipsum blah blah."
+        result = WikipediaPlugin.limit_text_length(text, max_length=10)
+        self.assertEqual(result, "lorem…")
+        result = WikipediaPlugin.limit_text_length(text, max_length=15)
+        self.assertEqual(result, "lorem ipsum…")
+        result = WikipediaPlugin.limit_text_length(text, max_length=30)
+        self.assertEqual(result, "lorem ipsum blah blah.")

edmond/plugins/wikipedia.py

@@ -1,4 +1,5 @@
 import time
+from typing import cast
 
 try:
     import wikipedia
@@ -8,6 +9,7 @@ except ImportError:
     DEPENDENCIES_FOUND = False
 
 from edmond.plugin import Plugin
+from edmond.plugins.plus import PlusPlugin
 
 
 class WikipediaPlugin(Plugin):
@@ -50,11 +52,9 @@ class WikipediaPlugin(Plugin):
                 self.bot.log_d(f"Wikipedia exception: {exc}")
             retries -= 1
         if page:
-            if plus_plugin := self.bot.get_plugin("plus"):
-                def handler(plus_event):
-                    self.bot.say(plus_event.target, page.url)
-                plus_plugin.add_handler(event.target, handler)
-            self.bot.say(event.target, page.summary)
+            reply = WikipediaPlugin.limit_text_length(page.summary)
+            self.register_url_for_plus(page.url, event.target)
+            self.bot.say(event.target, summary)
 
     def tell_definition(self, event):
         page = None
@@ -76,11 +76,28 @@ class WikipediaPlugin(Plugin):
                 time.sleep(1)
             retries -= 1
         if page:
-            reply = page.summary.split(". ", maxsplit=1)[0]
-            if len(reply) > 200:
-                reply = reply[:196] + " […]"
-            if plus_plugin := self.bot.get_plugin("plus"):
-                def handler(plus_event):
-                    self.bot.say(plus_event.target, page.url)
-                plus_plugin.add_handler(event.target, handler)
+            reply = WikipediaPlugin.limit_text_length(page.summary)
+            self.register_url_for_plus(page.url, event.target)
         self.bot.say(event.target, reply)
+
+    def register_url_for_plus(self, url: str, target: str):
+        if plus_plugin := self.bot.get_plugin("plus"):
+            def handler(plus_event):
+                self.bot.say(plus_event.target, url)
+            cast(PlusPlugin, plus_plugin).add_handler(target, handler)
+
+    @staticmethod
+    def limit_text_length(text, max_length=200):
+        """Limit text size to 200 characters max."""
+        words = text.split(" ")
+        cut_text = ""
+        while words:
+            next_word = words.pop(0)
+            if len(cut_text) + len(next_word) + 1 >= max_length:
+                break
+            cut_text += next_word + " "
+        if len(cut_text) < len(text):
+            cut_text = cut_text[:-1] + "…"
+        else:
+            cut_text = cut_text.rstrip()
+        return cut_text