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NoneBot2 plugin for sending text and image messages to receipts-spooler

Project description

nonebot_plugin_receipts

一个面向 NoneBot2 的独立插件,用来把发送给 Bot 的文本和图片消息转成 ESC/POS 原始打印数据,再投递给 receipts-spooler

当前实现面向 OneBot v11 适配器,适合 QQ 机器人消息场景。

功能

  • 提供 ticket小票receipt 指令,三者互为别名
  • 支持命令后直接附带文本和图片
  • 如果命令后没有内容,会继续追问下一条消息
  • 将文本和图片合成为一张热敏小票图,再编码为 ESC/POS 栅格打印命令
  • 通过 receipts-spooler/api/v1/task/push_raw 接口提交打印任务

安装

cd nonebot_plugin_receipts
pip install -e .

然后在你的 NoneBot2 项目中加载插件:

nonebot.load_plugin("nonebot_plugin_receipts")

配置

插件通过 NoneBot 全局配置读取以下环境变量:

变量 默认值 说明
RECEIPTS_SPOOLER_URL http://127.0.0.1:8000 receipts-spooler 服务地址
RECEIPTS_SPOOLER_TOKEN 对应 X-Spooler-Token
RECEIPTS_SPOOLER_TIMEOUT 5.0 调用 spooler 的 HTTP 超时
RECEIPT_IMAGE_FETCH_TIMEOUT 5.0 下载图片消息内容时的 HTTP 超时
RECEIPT_RENDER_MODE raster 渲染模式,可选 raster/hybrid
RECEIPT_PRINTER_WIDTH 576 小票像素宽度,最大 576
RECEIPT_TEMPLATE_PATH 可选,指向渲染模板 JSON 文件
RECEIPT_FONT_PATH 可选,建议配置支持中文的 TTF/OTF 字体
RECEIPT_FONT_SIZE 24 文本字号
RECEIPT_LINE_SPACING 6 文本行距
RECEIPT_SECTION_GAP 6 文本和图片之间的垂直间距
RECEIPT_FEED_LINES 4 打印后走纸行数
RECEIPT_ENABLE_CUT true 是否附加切纸命令

渲染模式

  • raster:把文本和图片一起渲染成整张位图,再输出 ESC/POS 栅格数据,兼容性最好。
  • hybrid:文本走打印机原生字符输出,图片仍走位图,能减少大量文字被渲染成图片。

hybrid 模式下,中文是否正常输出取决于打印机对中英文字符集的支持情况。

渲染模板

如果你想单独调整小票布局,可以配置 RECEIPT_TEMPLATE_PATH 指向一个 JSON 文件。项目根目录里附带了一个示例文件 receipt_template.example.json

支持的模板字段:

字段 默认值 说明
margin 16 左右和顶部内边距
footer_enabled true 是否渲染页脚
footer_text {sender_name}({sender_id}) @ {timestamp} 页脚文字模板
footer_timestamp_format %Y-%m-%d %H:%M:%S 时间格式
footer_timezone_offset_hours 8 页脚时间使用的时区偏移

footer_text 支持这些占位符:

  • {timestamp}
  • {sender_name}
  • {sender_id}

示例:

{
  "margin": 24,
  "footer_enabled": true,
  "footer_text": "{sender_name}({sender_id}) 打印于 {timestamp}",
  "footer_timestamp_format": "%Y/%m/%d %H:%M",
  "footer_timezone_offset_hours": 8
}

使用

直接在命令后附带内容:

/小票 今晚睡大觉

或者:

  1. 发送 /小票
  2. 按提示继续发送一条包含文本、图片或两者混合的消息

插件会把纯文本和图片消息段一起打印,并在提交成功后回复当前队列长度。

注意事项

  • 如果你需要打印中文,最好配置 RECEIPT_FONT_PATH 指向支持中文的字体文件。
  • 图片消息需要 OneBot 事件中带有可访问的 url,或消息段 filebase64://... / http(s)://...
  • 本插件不会直接连接打印机,只负责把任务提交到 receipts-spooler

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