send-md-as (v0.4.1)
Render Markdown as a polished image (JPEG / PNG / WebP / PDF) and send it via openclaw message send --media.
将 Markdown 渲染为精美图片，通过 openclaw message send --media 发送。
适用于不原生支持 Markdown 的聊天渠道（如微信/WeChat）。
Manual trigger only / 完全手动触发 — Only use when user explicitly asks to render. Do not auto-detect. / 用户主动要求渲染时使用，不自动判断。
Default behavior / 默认行为 — No cropping, no page split. Output complete single image. Only use --pages when user explicitly requests pagination. PDF naturally paginated via Playwright PDF API. / 不裁剪不分页，输出完整单张图片。仅在用户明确要求分页时使用 --pages。输出 PDF 时自然分页（Playwright PDF API）。
Usage / 使用方式
# Basic render / 基础渲染
bash render.sh input.md output.jpg
# With theme / 指定主题
bash render.sh --theme dark input.md output.jpg
# With page split / 自动分页（仅当用户明确要求时使用）
bash render.sh --pages a5 input.md output.jpg
# Output format / 输出格式
bash render.sh --format pdf input.md output.pdf
bash render.sh --format png input.md output.png
# Combined / 组合使用
bash render.sh --theme nord --pages a4 --format png input.md output.png
# Send via channel / 通过渠道发送
openclaw message send --channel <channel> --target "<id>" --media output.jpg
Hard Rules / 硬性规则
- Never crop or paginate without explicit user request / 禁止自作主张裁剪/分页。默认输出完整内容，不丢任何部分。只有用户明确要求分页时才用
--pages。 - Prefer PDF for long content / 内容较长时优先选 PDF（PDF 自然分页，图片会超长）。
Options / 选项
| Option 选项 | Values 值 | Default 默认 | Description 说明 |
|---|---|---|---|
--theme |
light, dark, sepia, nord |
light |
Color theme 色彩主题 |
--pages |
none, a4, a5 |
none |
Page split mode 分页模式（图片模式有效） |
--format |
jpg, png, webp, pdf |
jpg |
Output format 输出格式 |
Setup / 安装
bash /path/to/skills/send-md-as/setup.sh
Dependencies / 依赖
| Item 组件 | Required 必需 | Notes 说明 |
|---|---|---|
| python3 | Yes 是 | Runtime 运行时 |
| playwright | Yes 是 | 渲染引擎（截图 / PDF） |
| python3-pillow | Yes 是 | Page split 分页处理 |
| python3-mistune | Yes 是 | Markdown parser Markdown 解析器 |
| nh3 | Yes 是 | HTML sanitization HTML 消毒 |
| python3-pygments | No 否 | Syntax highlighting 语法高亮 |
| katex (npm) | No 否 | LaTeX offline rendering LaTeX 离线渲染 |
| mermaid-cli (npm) | No 否 | Diagram rendering 图表渲染 |
Features / 功能
- Headings (h1–h3), bold, italic, inline code / 标题、加粗、斜体、行内代码
- Code blocks — line numbers, Monokai/nord syntax highlighting (Pygments), auto word-wrap / 代码块—行号、Monokai/nord 高亮、自动换行
- LaTeX — inline
$...$and display$$...$$(KaTeX CLI, offline) / LaTeX 公式—KaTeX CLI 离线渲染 - Mermaid diagrams (rendered as SVG) with styled fallback placeholder / Mermaid 图表—SVG 渲染，失败时优雅降级
- Unordered/ordered lists, blockquotes, horizontal rules, links, tables / 列表、引用、分割线、链接、表格
- Task lists / GitHub 风格任务列表 (
- [ ]/- [x]) - 4 color themes: light, dark, sepia, nord / 4 种色彩主题
- Smart page splitting: none, A4, A5 (blank-row + heading-aware breakpoints) / 智能分页
- Multi-format output: JPEG, PNG, WebP, PDF (native Playwright PDF API) / 多格式输出
- Zero CDN at render time: fully offline once deps are installed / 渲染阶段零 CDN 依赖（安装时需网络下载依赖）
Troubleshooting / 故障排除
| Problem 问题 | Solution 解决方案 |
|---|---|
| Chromium launch fails (WSL2/Docker) | render.sh auto-retries with compatibility fallback. If still fails, check Chromium is installed: python3 -m playwright install chromium |
| Playwright download slow (China) | Set mirror: export PLAYWRIGHT_DOWNLOAD_HOST=https://npmmirror.com/mirrors/playwright playwright install chromium |
command not found after install |
Run: export PATH="$HOME/.local/bin:$PATH" and add to ~/.bashrc or ~/.zshrc |
| LaTeX shows as raw text | Install KaTeX: npm install --prefix ./vendor katex |
| Mermaid shows as code block | Install mermaid-cli: npm install --prefix ./vendor @mermaid-js/mermaid-cli |
| Code blocks have no colors | Install Pygments: python3 -m pip install --user pygments |
Architecture / 架构
Markdown → preprocess task lists
→ mistune → HTML
LaTeX → extracted → §placeholder§ → KaTeX CLI (npm) → restored
Mermaid → mmdc → SVG → embedded; fallback → styled placeholder
→ Playwright Chromium screenshot → JPEG / PNG / WebP
→ Playwright page.pdf() → PDF (native pagination)
→ Pillow page split → multiple images (JPEG/PNG/WebP only)