maxiee / remark-mermaid

A remark plugin for Markdown that replaces mermaid graphs with rendered SVGs.

remark-mermaid

Replaces mermaid graphs with rendered SVGs.

You might also like remark-graphviz.

Installation

$ npm install remark-mermaid

Usage

Graphs defined using mermaid can be referenced using a mermaid: title which will generate an SVG image.

[Link to a Graph](test/fixtures/assets/example.mmd "mermaid:")
![Embed image of graph](test/fixtures/assets/example.mdd "mermaid:")

Alternatively, graphs can be generated inline, by using mermaid as the language identifier for a fenced code block.

```mermaid
graph LR
    Start --> Stop
```

See this project's fixtures for more examples.

Example

Given a file, example.md, which contains the following Markdown:

# mermaid code block

```mermaid
graph LR
    Start --> Stop
```

Using remark like follows:

var vfile = require('to-vfile');
var remark = require('remark');
var mermaid = require('remark-mermaid');

var example = vfile.readSync('example.md');

remark()
  .use(mermaid)
  .process(example, function (err, file) {
    if (err) throw err;
    console.log(String(file));
  });

Will result in an SVG being written relative to example.md, and the Markdown being transformed to:

# mermaid code block

![](./6b03e143dc2a47a93496133d692c44d5ec012b57.svg "`mermaid` image")

To change where the SVG's are written, set data.destinationDir on the vFile:

var vfile = require('to-vfile');
var remark = require('remark');
var mermaid = require('remark-mermaid');

var example = vfile.readSync('example.md');
example.data = {
  destinationDir: '~/absolute/path/to/output'
};

remark()
  .use(mermaid)
  .process(example, function (err, file) {
    if (err) throw err;
    vfile.writeSync({ path: example.destinationFilePath });
  });

This allows you process files from one directory, and save the results to another.