Add some fallback emoji support without the emoji package

ntfy/emoji.py

@@ -1,19 +1,40 @@
+from types import SimpleNamespace
 from typing import List, Tuple
 
 from mautrix.util.logging import TraceLogger
 
 try:
     import emoji
-    WHITE_CHECK_MARK = emoji.emojize(":white_check_mark:")
 except ImportError:
-    emoji = None
-    WHITE_CHECK_MARK = "✅"
+    # basic list of supported emoji, based on https://docs.ntfy.sh/publish/#tags-emojis
+    emoji_dict = {
+        "+1": "👍",
+        "-1": "👎️",
+        "facepalm": "🤦",
+        "partying_face": "🥳",
+        "warning": "⚠️",
+        "no_entry": "⛔",
+        "tada": "🎉",
+        "rotating_light": "🚨",
+        "no_entry_sign": "🚫",
+        "heavy_check_mark": "✔️",
+        "triangular_flag_on_post": "🚩",
+        "cd": "💿",
+        "loudspeaker": "📢",
+        "skull": "💀",
+        "computer": "💻",
+        "white_check_mark": "✅",
+    }
+    emoji = SimpleNamespace()
+    emoji.emojize = lambda e: emoji_dict.get(e[1:-1], e)
+    emoji.is_emoji = lambda e: e in emoji_dict.values()
+
+WHITE_CHECK_MARK = emoji.emojize(":white_check_mark:")
 
 
 def parse_tags(log: TraceLogger, tags: List[str]) -> Tuple[List[str], List[str]]:
     if emoji is None:
-        log.warn("Please install the `emoji` package for emoji support")
-        return ([], tags)
+        log.warn("Please install the `emoji` package for full emoji support")
     emojis = []
     non_emoji_tags = []