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This commit is contained in:
noneflow[bot]
2025-08-07 10:13:49 +00:00
parent ec965fc705
commit 2b9f8c15f2
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---
sidebar_position: 6
description: 快捷方式
---
# 快捷方式声明
针对 `Alconna` 编写对于入门开发者来说较为复杂的问题,本插件提供了一些快捷方式来简化开发者的工作。
## 装饰器构造器
本插件提供了一个 `funcommand` 装饰器, 其用于将一个接受任意参数, 返回 `str``Message``MessageSegment` 的函数转换为命令响应器:
```python
from nonebot_plugin_alconna import funcommand
@funcommand()
async def echo(msg: str):
return msg
```
其等同于:
```python
from arclet.alconna import Alconna, Args
from nonebot_plugin_alconna import on_alconna, AlconnaMatch, Match
echo = on_alconna(Alconna("echo", Args["msg", str]))
@echo.handle()
async def echo_exit(msg: Match[str] = AlconnaMatch("msg")):
await echo.finish(msg.result)
```
相比于 `on_alconna` `funcommand` 增加了三个参数 `name`, `prefixes``description`
## 类 Koishi 构造器
本插件提供了一个 `Command` 构造器,其基于 `arclet.alconna.tools` 中的 `AlconnaString` 以类似 `Koishi` 中[注册命令](https://koishi.chat/zh-CN/guide/basic/command.html)的方式来构建一个 **AlconnaMatcher**
```python
from nonebot_plugin_alconna import Command, Arparma
book = (
Command("book", "测试")
.option("writer", "-w <id:int>")
.option("writer", "--anonymous", {"id": 0})
.usage("book [-w <id:int> | --anonymous]")
.shortcut("测试", {"args": ["--anonymous"]})
.build()
)
@book.handle()
async def _(arp: Arparma):
await book.send(str(arp.options))
```
甚至,你可以设置 `action` 来设定响应行为:
```python
book = (
Command("book", "测试")
.option("writer", "-w <id:int>")
.option("writer", "--anonymous", {"id": 0})
.usage("book [-w <id:int> | --anonymous]")
.shortcut("测试", {"args": ["--anonymous"]})
.action(lambda options: str(options)) # 会自动通过 bot.send 发送
.build()
)
```
### 参数类型
`Command` 的参数类型也如 `koishi` 一样,**必选参数** 用尖括号包裹,**可选参数** 用方括号包裹:
- `foo` 表示参数 `foo`, 类型为 Any
- `foo:int` 表示参数 `foo`, 类型为 int
- `foo:int=1` 表示参数 `foo`, 类型为 int, 默认值为 1
- `...foo` 表示[泛匹配参数](command.md#allparam)
- `foo:str+`, `foo:str*` 表示[变长参数](command.md#multivar-与-keywordvar) `foo`, 类型为 str
- `foo:+str`, `foo:text` 表示参数 `foo`, 类型为 str, 并且将包含空格 (即将变长参数的结果用空格合并)
特别的,针对类型部分,本插件拓展了如下内容:
- `foo:At`, `foo:Image`, ... 表示类型为[通用消息段](./uniseg/segment.md)
- `foo:select(Image).first` 表示获取子元素类型
- `foo:Dot(Image, 'url')` 表示类型为 `Image`,并且只获取 `url` 属性
### 从文件加载
`Command` 支持读取 `json``yaml` 文件来加载命令:
```yml title="book.yml"
command: book
help: 测试
options:
- name: writer
opt: "-w <id:int>"
- name: writer
opt: "--anonymous"
default:
id: 1
usage: book [-w <id:int> | --anonymous]
shortcuts:
- key: 测试
args: ["--anonymous"]
actions:
- params: ["options"]
code: |
return str(options)
```
```python title="加载"
from nonebot_plugin_alconna import command_from_yaml
book = command_from_yaml("book.yml")
```