Render Kroki diagrams in Quarto documents (HTML and PDF).

This uses the Kroki HTTP API via curl, doing a POST request.

quarto add fermarsan/quarto-kroki

This will install the extension under the _extensions subdirectory.

Here is how you add the filter to a page (it can also be added to a _quarto.yml project file with the same syntax):

---
title: "My Document"
filters:
  - quarto-kroki
---

And then add the following markdown in your quarto file:

```kroki-<diagram_kind>
    diagram code
```

for instance:

```kroki-graphviz
digraph G { 
  Hello -> World 
}
```

or

```kroki-ditaa
+---------+    +---------+
|  Hello  |--->|  World  |
+---------+    +---------+
```

Make sure you have curl is installed and available in your PATH.

There are two source code minimal examples:

• test.qmd "HTML"

• test_pdf.qmd "pdf"

If the pdf output format is enabled, you can insert Kroki diagrams via inkscape:

---
title: "My Document"
filters:
  - quarto-kroki
format: pdf
---

In that case make sure you have inkscape installed and available in your PATH.

For PDF output the cross reference name will be the name of the resultant images, for instance, this example:

```{.kroki-ditaa #fig:hello-world} 
+---------+    +---------+
|  Hello  |--->|  World  |
+---------+    +---------+
```

will create the files:

assets/
├── hello-world.svg
└── hello-world.pdf