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docs: template variables (#26547) 

Explanation for using gitea's variables in `.tmpl` files.

Thanks to @wxiaoguang for advising me on
[discord](https://discord.com/channels/322538954119184384/561007778139734027/1141217820441587722).
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docs/content/administration/customizing-gitea.en-us.md
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@ -126,7 +126,17 @@ Apart from `extra_links.tmpl` and `extra_tabs.tmpl`, there are other useful temp
- `body_outer_post.tmpl`, before the bottom `<footer>` element. - `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. - `footer.tmpl`, right before the end of the `<body>` tag, a good place for additional JavaScript.
#### Example: PlantUML ### Using Gitea variables
It's possible to use various Gitea variables in your custom templates.
First, _temporarily_ enable development mode: in your `app.ini` change from `RUN_MODE = prod` to `RUN_MODE = dev`. Then add `{{ $ | DumpVar }}` to any of your templates, restart Gitea and refresh that page; that will dump all available variables.
Find the data that you need, and use the corresponding variable; for example, if you need the name of the repository then you'd use `{{.Repository.Name}}`.
If you need to transform that data somehow, and aren't familiar with Go, an easy workaround is to add the data to the DOM and add a small JavaScript script block to manipulate the data.
### Example: PlantUML
You can add [PlantUML](https://plantuml.com/) support to Gitea's markdown by using a PlantUML server. You can add [PlantUML](https://plantuml.com/) support to Gitea's markdown by using a PlantUML server.
The data is encoded and sent to the PlantUML server which generates the picture. There is an online The data is encoded and sent to the PlantUML server which generates the picture. There is an online
@ -162,7 +172,7 @@ Alice <-- Bob: Another authentication Response
The script will detect tags with `class="language-plantuml"`, but you can change this by providing a second argument to `parsePlantumlCodeBlocks`. The script will detect tags with `class="language-plantuml"`, but you can change this by providing a second argument to `parsePlantumlCodeBlocks`.
#### Example: STL Preview ### Example: STL Preview
You can display STL file directly in Gitea by adding: You can display STL file directly in Gitea by adding: