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100 lines
3.3 KiB
100 lines
3.3 KiB
---
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date: "2018-11-23:00:00+02:00"
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title: "External renderers"
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slug: "external-renderers"
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weight: 40
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toc: false
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draft: false
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menu:
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sidebar:
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parent: "advanced"
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name: "External renderers"
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weight: 40
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identifier: "external-renderers"
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---
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# Custom files rendering configuration
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**Table of Contents**
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{{< toc >}}
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Gitea supports custom file renderings (i.e., Jupyter notebooks, asciidoc, etc.) through external binaries,
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it is just a matter of:
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- installing external binaries
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- add some configuration to your `app.ini` file
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- restart your Gitea instance
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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.
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## Installing external binaries
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In order to get file rendering through external binaries, their associated packages must be installed.
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If you're using a Docker image, your `Dockerfile` should contain something along this lines:
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```docker
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FROM gitea/gitea:{{< version >}}
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[...]
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COPY custom/app.ini /data/gitea/conf/app.ini
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[...]
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RUN apk --no-cache add asciidoctor freetype freetype-dev gcc g++ libpng libffi-dev py-pip python3-dev py3-pip py3-pyzmq
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# install any other package you need for your external renderers
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RUN pip3 install --upgrade pip
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RUN pip3 install -U setuptools
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RUN pip3 install jupyter docutils
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# add above any other python package you may need to install
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```
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## `app.ini` file configuration
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add one `[markup.XXXXX]` section per external renderer on your custom `app.ini`:
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```ini
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[markup.asciidoc]
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ENABLED = true
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FILE_EXTENSIONS = .adoc,.asciidoc
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RENDER_COMMAND = "asciidoctor -s -a showtitle --out-file=- -"
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; Input is not a standard input but a file
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IS_INPUT_FILE = false
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[markup.jupyter]
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ENABLED = true
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FILE_EXTENSIONS = .ipynb
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RENDER_COMMAND = "jupyter nbconvert --stdout --to html --template basic "
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IS_INPUT_FILE = true
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[markup.restructuredtext]
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ENABLED = true
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FILE_EXTENSIONS = .rst
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RENDER_COMMAND = rst2html.py
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IS_INPUT_FILE = false
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```
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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 sanitizier. The example below will support [KaTeX](https://katex.org/) output from [`pandoc`](https://pandoc.org/).
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```ini
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[markup.sanitizer.TeX]
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; Pandoc renders TeX segments as <span>s with the "math" class, optionally
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; with "inline" or "display" classes depending on context.
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ELEMENT = span
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ALLOW_ATTR = class
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REGEXP = ^\s*((math(\s+|$)|inline(\s+|$)|display(\s+|$)))+
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[markup.markdown]
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ENABLED = true
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FILE_EXTENSIONS = .md,.markdown
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RENDER_COMMAND = pandoc -f markdown -t html --katex
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```
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You must define `ELEMENT`, `ALLOW_ATTR`, and `REGEXP` in each section.
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To define multiple entries, add a unique alphanumeric suffix (e.g., `[markup.sanitizer.1]` and `[markup.sanitizer.something]`).
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Once your configuration changes have been made, restart Gitea to have changes take effect.
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**Note**: Prior to Gitea 1.12 there was a single `markup.sanitiser` section with keys that were redefined for multiple rules, however,
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there were significant problems with this method of configuration necessitating configuration through multiple sections.
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