✨ 添加 Theme 功能

nonebot_bison/theme/themes/basic/__init__.py

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+from .build import BasicTheme
+
+__theme_meta__ = BasicTheme()

nonebot_bison/theme/themes/basic/build.py

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+from typing import TYPE_CHECKING, Literal
+
+from nonebot_plugin_saa import Text, Image, MessageSegmentFactory
+
+from nonebot_bison.theme import Theme
+from nonebot_bison.utils import pic_merge, is_pics_mergable
+
+if TYPE_CHECKING:
+    from nonebot_bison.post import Post
+
+
+class BasicTheme(Theme):
+    """最基本的主题
+
+    纯文本，应为每个Post必定支持的Theme
+    """
+
+    name: Literal["basic"] = "basic"
+
+    async def render(self, post: "Post") -> list[MessageSegmentFactory]:
+        text = ""
+
+        if post.title:
+            text += f"{post.title}\n\n"
+
+        text += post.content if len(post.content) < 500 else f"{post.content[:500]}..."
+
+        text += f"\n来源: {post.platform.name} {post.nickname or ''}\n"
+
+        if post.url:
+            text += f"详情: {post.url}"
+
+        msgs: list[MessageSegmentFactory] = [Text(text)]
+        if post.images:
+            pics = post.images
+            if is_pics_mergable(pics):
+                pics = await pic_merge(list(pics), post.platform.client)
+            msgs.extend(map(Image, pics))
+
+        return msgs