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----
-date: "2018-11-23:00:00+02:00"
-title: "External renderers"
-slug: "external-renderers"
-weight: 40
-toc: false
-draft: false
-menu:
-  sidebar:
-    parent: "advanced"
-    name: "External renderers"
-    weight: 40
-    identifier: "external-renderers"
----
-
-# Custom files rendering configuration
-
-**Table of Contents**
-
-{{< toc >}}
-
-Gitea supports custom file renderings (i.e., Jupyter notebooks, asciidoc, etc.) through external binaries,
-it is just a matter of:
-
-- installing external binaries
-- add some configuration to your `app.ini` file
-- restart your Gitea instance
-
-This supports rendering of whole files. If you want to render code blocks in markdown you would need to do something with javascript. See some examples on the [Customizing Gitea](../customizing-gitea) page.
-
-## Installing external binaries
-
-In order to get file rendering through external binaries, their associated packages must be installed.
-If you're using a Docker image, your `Dockerfile` should contain something along this lines:
-
-```docker
-FROM gitea/gitea:{{< version >}}
-[...]
-
-COPY custom/app.ini /data/gitea/conf/app.ini
-[...]
-
-RUN apk --no-cache add asciidoctor freetype freetype-dev gcc g++ libpng libffi-dev py-pip python3-dev py3-pip py3-pyzmq
-# install any other package you need for your external renderers
-
-RUN pip3 install --upgrade pip
-RUN pip3 install -U setuptools
-RUN pip3 install jupyter docutils
-# add above any other python package you may need to install
-```
-
-## `app.ini` file configuration
-
-add one `[markup.XXXXX]` section per external renderer on your custom `app.ini`:
-
-```ini
-[markup.asciidoc]
-ENABLED = true
-FILE_EXTENSIONS = .adoc,.asciidoc
-RENDER_COMMAND = "asciidoctor -s -a showtitle --out-file=- -"
-; Input is not a standard input but a file
-IS_INPUT_FILE = false
-
-[markup.jupyter]
-ENABLED = true
-FILE_EXTENSIONS = .ipynb
-RENDER_COMMAND = "jupyter nbconvert --stdin --stdout --to html --template basic"
-IS_INPUT_FILE = false
-
-[markup.restructuredtext]
-ENABLED = true
-FILE_EXTENSIONS = .rst
-RENDER_COMMAND = "timeout 30s pandoc +RTS -M512M -RTS -f rst"
-IS_INPUT_FILE = false
-```
-
-If your external markup relies on additional classes and attributes on the generated HTML elements, you might need to enable custom sanitizer policies. Gitea uses the [`bluemonday`](https://godoc.org/github.com/microcosm-cc/bluemonday) package as our HTML sanitizer. The example below could be used to support server-side [KaTeX](https://katex.org/) rendering output from [`pandoc`](https://pandoc.org/).
-
-```ini
-[markup.sanitizer.TeX]
-; Pandoc renders TeX segments as <span>s with the "math" class, optionally
-; with "inline" or "display" classes depending on context.
-; - note this is different from the built-in math support in our markdown parser which uses <code>
-ELEMENT = span
-ALLOW_ATTR = class
-REGEXP = ^\s*((math(\s+|$)|inline(\s+|$)|display(\s+|$)))+
-
-[markup.markdown]
-ENABLED         = true
-FILE_EXTENSIONS = .md,.markdown
-RENDER_COMMAND  = pandoc -f markdown -t html --katex
-```
-
-You must define `ELEMENT` and `ALLOW_ATTR` in each section.
-
-To define multiple entries, add a unique alphanumeric suffix (e.g., `[markup.sanitizer.1]` and `[markup.sanitizer.something]`).
-
-To apply a sanitisation rules only for a specify external renderer they must use the renderer name, e.g. `[markup.sanitizer.asciidoc.rule-1]`, `[markup.sanitizer.<renderer>.rule-1]`.
-
-**Note**: If the rule is defined above the renderer ini section or the name does not match a renderer it is applied to every renderer.
-
-Once your configuration changes have been made, restart Gitea to have changes take effect.
-
-**Note**: Prior to Gitea 1.12 there was a single `markup.sanitiser` section with keys that were redefined for multiple rules, however,
-there were significant problems with this method of configuration necessitating configuration through multiple sections.
-
-### Example: HTML
-
-Render HTML files directly:
-
-```ini
-[markup.html]
-ENABLED         = true
-FILE_EXTENSIONS = .html,.htm
-RENDER_COMMAND  = cat
-; Input is not a standard input but a file
-IS_INPUT_FILE   = true
-
-[markup.sanitizer.html.1]
-ELEMENT = div
-ALLOW_ATTR = class
-
-[markup.sanitizer.html.2]
-ELEMENT = a
-ALLOW_ATTR = class
-```
-
-### Example: Office DOCX
-
-Display Office DOCX files with [`pandoc`](https://pandoc.org/):
-
-```ini
-[markup.docx]
-ENABLED = true
-FILE_EXTENSIONS = .docx
-RENDER_COMMAND = "pandoc --from docx --to html --self-contained --template /path/to/basic.html"
-
-[markup.sanitizer.docx.img]
-ALLOW_DATA_URI_IMAGES = true
-```
-
-The template file has the following content:
-
-```
-$body$
-```
-
-### Example: Jupyter Notebook
-
-Display Jupyter Notebook files with [`nbconvert`](https://github.com/jupyter/nbconvert):
-
-```ini
-[markup.jupyter]
-ENABLED = true
-FILE_EXTENSIONS = .ipynb
-RENDER_COMMAND = "jupyter-nbconvert --stdin --stdout --to html --template basic"
-
-[markup.sanitizer.jupyter.img]
-ALLOW_DATA_URI_IMAGES = true
-```
-
-## Customizing CSS
-
-The external renderer is specified in the .ini in the format `[markup.XXXXX]` and the HTML supplied by your external renderer will be wrapped in a `<div>` with classes `markup` and `XXXXX`. The `markup` class provides out of the box styling (as does `markdown` if `XXXXX` is `markdown`). Otherwise you can use these classes to specifically target the contents of your rendered HTML.
-
-And so you could write some CSS:
-
-```css
-.markup.XXXXX html {
-  font-size: 100%;
-  overflow-y: scroll;
-  -webkit-text-size-adjust: 100%;
-  -ms-text-size-adjust: 100%;
-}
-
-.markup.XXXXX body {
-  color: #444;
-  font-family: Georgia, Palatino, 'Palatino Linotype', Times, 'Times New Roman', serif;
-  font-size: 12px;
-  line-height: 1.7;
-  padding: 1em;
-  margin: auto;
-  max-width: 42em;
-  background: #fefefe;
-}
-
-.markup.XXXXX p {
-  color: orangered;
-}
-```
-
-Add your stylesheet to your custom directory e.g `custom/public/css/my-style-XXXXX.css` and import it using a custom header file `custom/templates/custom/header.tmpl`:
-
-```html
-<link rel="stylesheet" href="{{AppSubUrl}}/assets/css/my-style-XXXXX.css" />
-```