✨ 添加 Theme 功能

nonebot_bison/theme/themes/brief/__init__.py

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

nonebot_bison/theme/themes/brief/build.py

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+from typing import TYPE_CHECKING, Literal
+
+from nonebot_plugin_saa import Text, Image, MessageSegmentFactory
+
+from nonebot_bison.utils import pic_merge, is_pics_mergable
+from nonebot_bison.theme import Theme, ThemeRenderUnsupportError
+
+if TYPE_CHECKING:
+    from nonebot_bison.post import Post
+
+
+class BriefTheme(Theme):
+    """简报主题，只发送标题、头图（如果有）、URL（如果有）"""
+
+    name: Literal["brief"] = "brief"
+
+    async def render(self, post: "Post") -> list[MessageSegmentFactory]:
+        if not post.title:
+            raise ThemeRenderUnsupportError("Post has no title")
+        text = f"{post.title}\n\n"
+        text += f"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.append(Image(pics[0]))
+
+        return msgs