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https://github.com/abhinav/goldmark-mermaid
Mermaid diagram support for Goldmark Markdown parser.
https://github.com/abhinav/goldmark-mermaid
golang markdown mermaidjs
Last synced: about 9 hours ago
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Mermaid diagram support for Goldmark Markdown parser.
- Host: GitHub
- URL: https://github.com/abhinav/goldmark-mermaid
- Owner: abhinav
- License: bsd-3-clause
- Created: 2021-04-12T19:50:39.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2024-09-11T16:58:50.000Z (22 days ago)
- Last Synced: 2024-09-12T02:32:19.810Z (22 days ago)
- Topics: golang, markdown, mermaidjs
- Language: Go
- Homepage: https://abhinav.github.io/goldmark-mermaid/
- Size: 855 KB
- Stars: 41
- Watchers: 4
- Forks: 4
- Open Issues: 4
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
README
# goldmark-mermaid
- [Introduction](#introduction)
- [Installation](#installation)
- [Usage](#usage)
- [Rendering](#rendering)
- [Rendering modes](#rendering-methods)
- [Server-side rendering](#server-side-rendering)
- [License](#license)
## Introduction
[](https://pkg.go.dev/go.abhg.dev/goldmark/mermaid)
[](https://github.com/abhinav/goldmark-mermaid/actions/workflows/ci.yml)
[](https://codecov.io/gh/abhinav/goldmark-mermaid)
goldmark-mermaid is an extension for the [goldmark](http://github.com/yuin/goldmark) Markdown parser that adds
support for [Mermaid](https://mermaid-js.github.io/mermaid/) diagrams.
**Demo**:
A web-based demonstration of the extension is available at
https://abhinav.github.io/goldmark-mermaid/demo/.
### Features
- Pluggable components
- Supports client-side rendering by injecting JavaScript
- Supports server-side rendering with the MermaidJS CLI or with your browser
## Installation
Install the latest version of the library with Go modules.
```bash
go get go.abhg.dev/goldmark/mermaid@latest
```
## Usage
To use goldmark-mermaid, import the `mermaid` package.
```go
import "go.abhg.dev/goldmark/mermaid"
```
Then include the `mermaid.Extender` in the list of extensions you build your
[`goldmark.Markdown`](https://pkg.go.dev/github.com/yuin/goldmark#Markdown) with.
```go
goldmark.New(
goldmark.WithExtensions(
// ...
&mermaid.Extender{},
),
// ...
).Convert(src, out)
```
The package supports Mermaid diagrams inside fenced code blocks with the language `mermaid`. For example,
```mermaid
graph TD;
A-->B;
A-->C;
B-->D;
C-->D;
```
When you render the Markdown as HTML, these will be rendered into diagrams.
You can also render diagrams server-side if you have a Chromium-like browser
installed. See [Rendering with CDP](#render-cdp) for details.
## Rendering
### Rendering methods
goldmark-mermaid supports two rendering modes:
- **Client-side**:
Diagrams are rendered in-browser by injecting MermaidJS
into the generated HTML.
- **Server-side**:
Diagrams are rendered at the time the HTML is generated.
The browser receives only the final SVGs.
You can pick between these by setting the `RenderMode` field.
```go
goldmark.New(
goldmark.WithExtensions(
&mermaid.Extender{
RenderMode: mermaid.RenderModeServer, // or RenderModeClient
},
),
// ...
).Convert(src, out)
```
A third automatic mode is provided as a convenience.
It automatically picks between client-side and server-side rendering
based on other configurations and system functionality.
This mode is the default.
### Server-side rendering
goldmark-mermaid offers two options for server-side rendering:
- **CLI-based rendering**
invokes the MermaidJS CLI (`mmdc`) on your system to render diagrams
- **CDP-based rendering**
uses Chrome DevTools Protocol to drive a headless browser on your system,
and uses it to render diagrams
#### Rendering with the MermaidJS CLI
If server-side rendering is chosen, by default, the CLI-based renderer is used.
You can request it explicitly
by supplying a `CLICompiler` to `mermaid.Extender` or `mermaid.ServerRenderer`.
```go
&mermaid.Extender{
Compiler: &mermaid.CLICompiler{
Theme: "neutral",
},
}
```
By default, the `CLICompiler` will search for `mmdc` on your `$PATH`.
Specify an alternative path with the `CLI` field:
```go
&mermaid.CLICompiler{
CLI: mermaid.MMDC(pathToMMDC),
}
```
#### Rendering with Chrome DevTools Protocol
If you have a Chromium-like browser installed on your system
goldmark-mermaid can spin up a long-running headless process of it,
and use that to render MermaidJS diagrams.
To use this, first download a minified copy of the MermaidJS source code.
You can get it from https://cdn.jsdelivr.net/npm/mermaid@latest/dist/mermaid.min.js.
Embed this into your program with `go:embed`.
```go
import _ "embed" // needed for go:embed
//go:embed mermaid.min.js
var mermaidJSSource string
```
Next, import `go.abhg.dev/goldmark/mermaid/mermaidcdp`,
and set up a `mermaidcdp.Compiler`.
```go
compiler, err := mermaidcdp.New(&mermaidcdp.Config{
JSSource: mermaidJSSource,
})
if err != nil {
panic(err)
}
defer compiler.Close() // Don't forget this!
```
Plug this compiler into the `mermaid.Extender` that
you install into your Goldmark Markdown object,
and use the Markdown object like usual.
```go
md := goldmark.New(
goldmark.WithExtensions(
// ...
&mermaid.Extender{
Compiler: compiler,
},
),
// ...
)
md.Convert(...)
```
## License
This software is made available under the BSD3 license.