opencode-mermaid-renderer

Render mermaid diagrams as beautiful ASCII art directly in OpenCode.

Powered by beautiful-mermaid from Craft.

Usage

Add the plugin to your .opencode/opencode.jsonc:

{
  "plugin": ["opencode-mermaid-renderer@0.0.1"]
}

Example

When the AI generates a mermaid diagram:

```mermaid
graph TD
  A[Start] --> B{Decision}
  B -->|Yes| C[Process]
  B -->|No| D[End]
```

The plugin automatically renders it as ASCII art:

┌──────────┐            
│          │            
│  Start   │            
│          │            
└─────┬────┘            
      │                 
      │                 
      │                 
      │                 
      ▼                 
┌──────────┐            
│          │            
│ Decision ├──No────┐   
│          │        │   
└─────┬────┘        │   
      │             │   
      │             │   
     Yes            │   
      │             │   
      ▼             ▼   
┌──────────┐     ┌─────┐
│          │     │     │
│ Process  │     │ End │
│          │     │     │
└──────────┘     └─────┘

Supported Diagram Types

• Flowcharts - graph TD, graph LR, graph BT, graph RL
• State diagrams - stateDiagram-v2
• Sequence diagrams - sequenceDiagram
• Class diagrams - classDiagram
• ER diagrams - erDiagram

Error Handling

If a mermaid diagram fails to render (invalid syntax, unsupported features), the plugin keeps the original code block and adds an HTML comment with the error:

```mermaid
invalid syntax here

## Requirements

- OpenCode >= 1.0.137

## License

MIT

## Credits

- [beautiful-mermaid](https://github.com/lukilabs/beautiful-mermaid) by Craft/Lukilabs
- Inspired by [@franlol/opencode-md-table-formatter](https://github.com/franlol/opencode-md-table-formatter)