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zeripath 27c6b8fc07 Add documentation to add Mermaid.js to Gitea (#9872) 
* Add documentation to add mermaid to Gitea

* Update documentation

Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>
2020-01-20 11:14:03 -05:00

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---
date: "2017-04-15T14:56:00+02:00"
title: "Customizing Gitea"
slug: "customizing-gitea"
weight: 9
toc: false
draft: false
menu:
sidebar:
parent: "advanced"
name: "Customizing Gitea"
identifier: "customizing-gitea"
weight: 9
---
# Customizing Gitea
Customizing Gitea is typically done using the `CustomPath` folder - by default this is
the `custom` folder from the running directory, but may be different if your build has
set this differently. This is the central place to override configuration settings,
templates, etc. You can check the `CustomPath` using `gitea help`. You can override
the `CustomPath` by setting either the `GITEA_CUSTOM` environment variable or by
using the `--custom-path` option on the `gitea` binary. (The option will override the
environment variable.)
If Gitea is deployed from binary, all default paths will be relative to the Gitea
binary. If installed from a distribution, these paths will likely be modified to
the Linux Filesystem Standard. Gitea will attempt to create required folders, including
`custom/`. Distributions may provide a symlink for `custom` using `/etc/gitea/`.
Application settings can be found in file `CustomConf` which is by default,
`CustomPath/conf/app.ini` but may be different if your build has set this differently.
Again `gitea help` will allow you review this variable and you can override it using the
`--config` option on the `gitea` binary.
- [Quick Cheat Sheet](https://docs.gitea.io/en-us/config-cheat-sheet/)
- [Complete List](https://github.com/go-gitea/gitea/blob/master/custom/conf/app.ini.sample)
If the `CustomPath` folder can't be found despite checking `gitea help`, check the `GITEA_CUSTOM`
environment variable; this can be used to override the default path to something else.
`GITEA_CUSTOM` might, for example, be set by an init script.
- [List of Environment Variables](https://docs.gitea.io/en-us/specific-variables/)
**Note:** Gitea must perform a full restart to see configuration changes.
## Serving custom public files
To make Gitea serve custom public files (like pages and images), use the folder
`custom/public/` as the webroot. Symbolic links will be followed.
For example, a file `image.png` stored in `custom/public/`, can be accessed with
the url `http://gitea.domain.tld/image.png`.
## Changing the default avatar
Place the png image at the following path: `custom/public/img/avatar_default.png`
## Customizing Gitea pages
The `custom/templates` folder allows changing every single page of Gitea. Templates
to override can be found in the [`templates`](https://github.com/go-gitea/gitea/tree/master/templates) directory of Gitea source (Note: the example link is from `master` branch. Make sure to copy templates from same release you are using). Override by
making a copy of the file under `custom/templates` using a full path structure
matching source.
Any statement contained inside `{{` and `}}` are Gitea's template syntax and
shouldn't be touched without fully understanding these components.
### Customizing startpage / homepage
Copy [`home.tmpl`](https://github.com/go-gitea/gitea/blob/master/templates/home.tmpl) for your version of Gitea from `templates` to `custom/templates`.
Edit as you wish.
Dont forget to restart your gitea to apply the changes.
### Adding links and tabs
If all you want is to add extra links to the top navigation bar or footer, or extra tabs to the repository view, you can put them in `extra_links.tmpl` (links added to the navbar), `extra_links_footer.tmpl` (links added to the left side of footer), and `extra_tabs.tmpl` inside your `custom/templates/custom/` directory.
For instance, let's say you are in Germany and must add the famously legally-required "Impressum"/about page, listing who is responsible for the site's content:
just place it under your "custom/public/" directory (for instance `custom/public/impressum.html`) and put a link to it in either `custom/templates/custom/extra_links.tmpl` or `custom/templates/custom/extra_links_footer.tmpl`.
To match the current style, the link should have the class name "item", and you can use `{{AppSubUrl}}` to get the base URL:
`<a class="item" href="{{AppSubUrl}}/impressum.html">Impressum</a>`
For more information, see [Adding Legal Pages](https://docs.gitea.io/en-us/adding-legal-pages).
You can add new tabs in the same way, putting them in `extra_tabs.tmpl`.
The exact HTML needed to match the style of other tabs is in the file
`templates/repo/header.tmpl`
([source in GitHub](https://github.com/go-gitea/gitea/blob/master/templates/repo/header.tmpl))
### Other additions to the page
Apart from `extra_links.tmpl` and `extra_tabs.tmpl`, there are other useful templates you can put in your `custom/templates/custom/` directory:
- `header.tmpl`, just before the end of the `<head>` tag where you can add custom CSS files for instance.
- `body_outer_pre.tmpl`, right after the start of `<body>`.
- `body_inner_pre.tmpl`, before the top navigation bar, but already inside the main container `<div class="full height">`.
- `body_inner_post.tmpl`, before the end of the main container.
- `body_outer_post.tmpl`, before the bottom `<footer>` element.
- `footer.tmpl`, right before the end of the `<body>` tag, a good place for additional Javascript.
#### Example: Mermaid.js
If you would like to add [mermaid.js](https://mermaid-js.github.io/) support to Gitea's markdown you simply add:
```html
{{if .RequireHighlightJS}}
<script src="https://unpkg.com/mermaid@8.4.5/dist/mermaid.min.js"></script>
<!-- or wherever you have placed it -->
<script>mermaid.init(".language-mermaid")</script>
{{end}}
```
to `custom/footer.tmpl`. You then can add blocks
like below to your markdown:
```mermaid
stateDiagram
[*] --> Active
state Active {
[*] --> NumLockOff
NumLockOff --> NumLockOn : EvNumLockPressed
NumLockOn --> NumLockOff : EvNumLockPressed
--
[*] --> CapsLockOff
CapsLockOff --> CapsLockOn : EvCapsLockPressed
CapsLockOn --> CapsLockOff : EvCapsLockPressed
--
[*] --> ScrollLockOff
ScrollLockOff --> ScrollLockOn : EvCapsLockPressed
ScrollLockOn --> ScrollLockOff : EvCapsLockPressed
}
```
If you want to use Mermaid.js outside of markdown, e.g. in other templates or HTML files,
you would need to remove `{{if .RequireHighlightJS}}` and `{{end}}`.
Mermaid will detect and use tags with `class="language-mermaid"`.
## Customizing Gitea mails
The `custom/templates/mail` folder allows changing the body of every mail of Gitea.
Templates to override can be found in the
[`templates/mail`](https://github.com/go-gitea/gitea/tree/master/templates/mail)
directory of Gitea source.
Override by making a copy of the file under `custom/templates/mail` using a
full path structure matching source.
Any statement contained inside `{{` and `}}` are Gitea's template
syntax and shouldn't be touched without fully understanding these components.
## Adding Analytics to Gitea
Google Analytics, Matomo (previously Piwik), and other analytics services can be added to Gitea. To add the tracking code, refer to the `Other additions to the page` section of this document, and add the JavaScript to the `custom/templates/custom/header.tmpl` file.
## Customizing gitignores, labels, licenses, locales, and readmes.
Place custom files in corresponding sub-folder under `custom/options`.
**NOTE:** The files should not have a file extension, e.g. `Labels` rather than `Labels.txt`
### gitignores
To add custom .gitignore, add a file with existing [.gitignore rules](https://git-scm.com/docs/gitignore) in it to `custom/options/gitignore`
### Labels
To add a custom label set, add a file that follows the [label format](https://github.com/go-gitea/gitea/blob/master/options/label/Default) to `custom/options/label`
`#hex-color label name ; label description`
### Licenses
To add a custom license, add a file with the license text to `custom/options/license`
### Locales
Locales are managed via our [crowdin](https://crowdin.com/project/gitea).
You can override a locale by placing an altered locale file in `custom/options/locale`.
Gitea's default locale files can be found in the [`options/locale`](https://github.com/go-gitea/gitea/tree/master/options/locale) source folder and these should be used as examples for your changes.
To add a completely new locale, as well as placing the file in the above location, you will need to add the new lang and name to the `[i18n]` section in your `app.ini`. Keep in mind that Gitea will use those settings as **overrides**, so if you want to keep the other languages as well you will need to copy/paste the default values and add your own to them.
```
[i18n]
LANGS = en-US,foo-BAR
NAMES = English,FooBar
```
Locales may change between versions, so keeping track of your customized locales is highly encouraged.
### Readmes
To add a custom Readme, add a markdown formatted file (without an `.md` extension) to `custom/options/readme`
### Reactions
To change reaction emoji's you can set allowed reactions at app.ini
```
[ui]
REACTIONS = +1, -1, laugh, confused, heart, hooray, eyes
```
A full list of supported emoji's is at [emoji list](https://gitea.com/gitea/gitea.com/issues/8)
## Customizing the look of Gitea
As of version 1.6.0 Gitea has built-in themes. The two built-in themes are, the default theme `gitea`, and a dark theme `arc-green`. To change the look of your Gitea install change the value of `DEFAULT_THEME` in the [ui](https://docs.gitea.io/en-us/config-cheat-sheet/#ui-ui) section of `app.ini` to another one of the available options.
As of version 1.8.0 Gitea also has per-user themes. The list of themes a user can choose from can be configured with the `THEMES` value in the [ui](https://docs.gitea.io/en-us/config-cheat-sheet/#ui-ui) section of `app.ini` (defaults to `gitea` and `arc-green`, light and dark respectively)
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