From 2084fd66af3e936571a1ddb6c9a8b16503d388a8 Mon Sep 17 00:00:00 2001
From: illvart <illvartv@gmail.com>
Date: Tue, 20 Dec 2022 17:53:54 +0700
Subject: [PATCH] add spoiler, strike and underline

- markdown ||spoiler||
- html <spoiler>spoiler</spoiler>
- html <strike>strike</strike>
- markdown --underline--
---
 telethon/extensions/html.py     | 12 ++++++++++--
 telethon/extensions/markdown.py |  6 ++++--
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/telethon/extensions/html.py b/telethon/extensions/html.py
index a25ed58b..9b9dfb29 100644
--- a/telethon/extensions/html.py
+++ b/telethon/extensions/html.py
@@ -12,7 +12,7 @@ from ..tl.types import (
     MessageEntityBold, MessageEntityItalic, MessageEntityCode,
     MessageEntityPre, MessageEntityEmail, MessageEntityUrl,
     MessageEntityTextUrl, MessageEntityMentionName,
-    MessageEntityUnderline, MessageEntityStrike, MessageEntityBlockquote,
+    MessageEntityUnderline, MessageEntityStrike, MessageEntityBlockquote, MessageEntitySpoiler,
     TypeMessageEntity
 )
 
@@ -51,10 +51,12 @@ class HTMLToTelegramParser(HTMLParser):
             EntityType = MessageEntityItalic
         elif tag == 'u':
             EntityType = MessageEntityUnderline
-        elif tag == 'del' or tag == 's':
+        elif tag in ['del', 's', 'strike']:
             EntityType = MessageEntityStrike
         elif tag == 'blockquote':
             EntityType = MessageEntityBlockquote
+        elif tag == 'spoiler':
+            EntityType = MessageEntitySpoiler
         elif tag == 'code':
             try:
                 # If we're in the middle of a <pre> tag, this <code> tag is
@@ -195,8 +197,14 @@ def unparse(text: str, entities: Iterable[TypeMessageEntity], _offset: int = 0,
             html.append('<u>{}</u>'.format(entity_text))
         elif entity_type == MessageEntityStrike:
             html.append('<del>{}</del>'.format(entity_text))
+        elif entity_type == MessageEntityStrike:
+            html.append('<s>{}</s>'.format(entity_text))
+        elif entity_type == MessageEntityStrike:
+            html.append('<strike>{}</strike>'.format(entity_text))
         elif entity_type == MessageEntityBlockquote:
             html.append('<blockquote>{}</blockquote>'.format(entity_text))
+        elif entity_type == MessageEntitySpoiler:
+            html.append('<spoiler>{}</spoiler>'.format(entity_text))
         elif entity_type == MessageEntityPre:
             if entity.language:
                 html.append(
diff --git a/telethon/extensions/markdown.py b/telethon/extensions/markdown.py
index d52fc347..07e759cc 100644
--- a/telethon/extensions/markdown.py
+++ b/telethon/extensions/markdown.py
@@ -11,7 +11,7 @@ from ..tl import TLObject
 from ..tl.types import (
     MessageEntityBold, MessageEntityItalic, MessageEntityCode,
     MessageEntityPre, MessageEntityTextUrl, MessageEntityMentionName,
-    MessageEntityStrike
+    MessageEntityStrike, MessageEntityUnderline, MessageEntitySpoiler
 )
 
 DEFAULT_DELIMITERS = {
@@ -19,7 +19,9 @@ DEFAULT_DELIMITERS = {
     '__': MessageEntityItalic,
     '~~': MessageEntityStrike,
     '`': MessageEntityCode,
-    '```': MessageEntityPre
+    '```': MessageEntityPre,
+    '--': MessageEntityUnderline,
+    '||': MessageEntitySpoiler
 }
 
 DEFAULT_URL_RE = re.compile(r'\[([^\]]+)\]\(([^)]+)\)')