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grav-plugin-langswitcher

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Grav LangSwitcher Plugin

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# Grav LangSwitcher Plugin

![LangSwitcher](https://raw.githubusercontent.com/getgrav/grav-plugin-langswitcher/develop/assets/readme_1.png)

`LangSwitcher` is a [Grav](http://github.com/getgrav/grav) plugin that provides native language text links to switch between [Multiple Languages](http://learn.getgrav.org/content/multi-language) in Grav **0.9.30** or greater.

# Installation

Installing the LangSwitcher plugin can be done in one of two ways. Our GPM (Grav Package Manager) installation method enables you to quickly and easily install the plugin with a simple terminal command, while the manual method enables you to do so via a zip file.

## GPM Installation (Preferred)

The simplest way to install this plugin is via the [Grav Package Manager (GPM)](http://learn.getgrav.org/advanced/grav-gpm) through your system's Terminal (also called the command line).  From the root of your Grav install type:

bin/gpm install langswitcher

This will install the LangSwitcher plugin into your `/user/plugins` directory within Grav. Its files can be found under `/your/site/grav/user/plugins/langswitcher`.

## Manual Installation

To install this plugin, just download the zip version of this repository and unzip it under `/your/site/grav/user/plugins`. Then, rename the folder to `langswitcher`. You can find these files either on [GitHub](https://github.com/getgrav/grav-plugin-langswitcher) or via [GetGrav.org](http://getgrav.org/downloads/plugins#extras).

You should now have all the plugin files under

/your/site/grav/user/plugins/langswitcher

# Usage

The `langswitcher` plugin doesn't require any configuration. You do however need to add the included Twig partials template into your own theme somewhere you want the available languages to be displayed.

```twig
{% include 'partials/langswitcher.html.twig' %}
```

Something you might want to do is to override the look and feel of the langswitcher, and with Grav it is super easy.

Copy the template file [langswitcher.html.twig](templates/partials/langswitcher.html.twig) into the `templates` folder of your custom theme:

```
/your/site/grav/user/themes/custom-theme/templates/partials/langswitcher.html.twig
```

You can now edit the override and tweak it however you prefer.

## Usage of the `hreflang` partial

A second template is available for `hreflang` annotations in the header of the page. In order to emit language annotations for the available languages of a page you need to add the corrsponding Twig partial template into the `<head>` section of your page, which can typically be found in `base.html.twig`:

```twkg
{% include 'partials/langswitcher.hreflang.html.twig' %}
```

This will generate something like:

```html
<link rel="alternate" href="http://example.com/en" hreflang="en" />
<link rel="alternate" href="http://example.com/de" hreflang="de" />
<link rel="alternate" href="http://example.com/zh-cn" hreflang="zh-cn" />
```

## Translated URL for an arbitrary page

The `langswitcher.*` Twig variables only describe the page currently being rendered. When you need the translated URL of *another* page — for example while listing pages in a collection across languages — use the `langswitcher_translated_url()` Twig function:

```twig
{# Pass a page object #}
<a href="{{ langswitcher_translated_url(page, 'es') }}">Español</a>

{# ...or a route string #}
<a href="{{ langswitcher_translated_url('/blog/my-post', 'es') }}">Español</a>
```

It returns the public URL of the given page in the requested language, resolving slug and route overrides and the configured content fallback chain the same way the current page's links are built. It returns `null` if the page or route can't be found.

# Updating

As development for the LangSwitcher plugin continues, new versions may become available that add additional features and functionality, improve compatibility with newer Grav releases, and generally provide a better user experience. Updating LangSwitcher is easy, and can be done through Grav's GPM system, as well as manually.

## GPM Update (Preferred)

The simplest way to update this plugin is via the [Grav Package Manager (GPM)](http://learn.getgrav.org/advanced/grav-gpm). You can do this with this by navigating to the root directory of your Grav install using your system's Terminal (also called command line) and typing the following:

bin/gpm update langswitcher

This command will check your Grav install to see if your LangSwitcher plugin is due for an update. If a newer release is found, you will be asked whether or not you wish to update. To continue, type `y` and hit enter. The plugin will automatically update and clear Grav's cache.

> Note: Any changes you have made to any of the files listed under this directory will also be removed and replaced by the new set. Any files located elsewhere (for example a YAML settings file placed in `user/config/plugins`) will remain intact.

## Configuration

Simply copy the `user/plugins/langswitcher/langswitcher.yaml` into `user/config/plugins/langswitcher.yaml` and make your modifications.

```yaml
enabled: true
built_in_css: true
translated_urls: true
untranslated_pages_behavior: none
language_display: long
```

Options are pretty self explanatory.

## Redirecting after switching language

To have Grav redirect to the default page route after switching language, you must add the following configuration to `user/config/system.yaml`

```yaml
pages:
  redirect_default_route: true
```

## Customization

The default format for the displaying of the languages is to use the native language names in a **long** format (e.g. `English`, `Deutsch`, `Français`).  However, you can change the default output to use **short** names (e.g. `EN`, `DE`, `FR`).

This can be configured via the `langswitcher.yaml` configuration file:

```yaml
language_display: long              # long | short are the valid options
```

You can also pass the format in directly via the Twig include:

```twig
{% include 'partials/langswitcher.hreflang.html.twig' with {display_format: 'short'} %}
```

Also you can override the two Twig partials that control the actual display of the **long** and **short** output, by copying the partial int your theme's `templates/partials/` folder and modifying:

```twig
# templates/partials/langswitcher-long.html.twig
{{ native_name(language)|capitalize }}
```

and

```twig
# templates/partials/langswitcher-short.html.twig
{{ language|upper }}
```

grav-plugin-langswitcher

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