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Merge pull request #1760 from dalance/i18n
Add i18n support
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‎.github/workflows/rbe.yml‎

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name: CI
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on: [push, pull_request]
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env:
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# Update the language picker in index.hbs to link new languages.
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LANGUAGES:
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jobs:
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test:
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name: Run tests
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@master
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- uses: actions/checkout@v4
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with:
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# We need the full history below.
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fetch-depth: 0
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- name: Update rustup
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run: rustup self update
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curl -sSL https://github.com/rust-lang/mdBook/releases/download/v0.4.15/mdbook-v0.4.15-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
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echo "$(pwd)/bin" >> ${GITHUB_PATH}
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- name: Install mdbook-i18n-helpers
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run: |
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cargo install mdbook-i18n-helpers --locked --version 0.3.0
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- name: Report versions
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run: |
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rustup --version
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https://raw.githubusercontent.com/rust-lang/rust/master/src/tools/linkchecker/linkcheck.sh
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sh linkcheck.sh --all rust-by-example
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- name: Build all translations
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run: |
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for po_lang in ${{ env.LANGUAGES }}; do
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POT_CREATION_DATE=$(grep --max-count 1 '^"POT-Creation-Date:' po/$po_lang.po | sed -E 's/".*: (.*)\\n"/\1/')
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if [[ $POT_CREATION_DATE == "" ]]; then
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POT_CREATION_DATE=now
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fi
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echo "::group::Building $po_lang translation as of $POT_CREATION_DATE"
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rm -r src/
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git restore --source "$(git rev-list -n 1 --before "$POT_CREATION_DATE" @)" src/
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# Set language and adjust site URL. Clear the redirects
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# since they are in sync with the source files, not the
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# translation.
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MDBOOK_BOOK__LANGUAGE=$po_lang \
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MDBOOK_OUTPUT__HTML__SITE_URL=/rust-by-example/$po_lang/ \
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MDBOOK_OUTPUT__HTML__REDIRECT='{}' \
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mdbook build -d book/$po_lang
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echo "::endgroup::"
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done
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- name: Upload Artifact
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uses: actions/upload-artifact@v3
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with:

‎.gitignore‎

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book
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po/messages.pot
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# Auto-generated files from macOS
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.DS_Store
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.DS_Store

‎README.md‎

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To be able to run the examples, you must be connected to the internet; you can
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read all content offline, however!
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The following warnings can be ignored safely.
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```
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[WARN] (mdbook::preprocess::cmd): The command wasn't found, is the "gettext" preprocessor installed?
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[WARN] (mdbook::preprocess::cmd): Command: mdbook-gettext
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```
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### Using translated version
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If there is a translated resource in `po/` directory, it can be specified through `MDBOOK_BOOK__LANGUAGE` like below:
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```bash
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git clone https://github.com/rust-lang/rust-by-example
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cd rust-by-example
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cargo install mdbook
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MDBOOK_BOOK__LANGUAGE=ja mdbook build
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MDBOOK_BOOK__LANGUAGE=ja mdbook serve
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```
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## Contributing
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Please see the [CONTRIBUTING.md] file for more details.
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[CONTRIBUTING.md]: https://github.com/rust-lang/rust-by-example/blob/master/CONTRIBUTING.md
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## Translating
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Please see the [TRANSLATING.md] file for more details.
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[TRANSLATING.md]: https://github.com/rust-lang/rust-by-example/blob/master/TRANSLATING.md
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## Translations to other languages
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* [Bulgarian](https://github.com/kberov/rust-by-example-bg)

‎TRANSLATING.md‎

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# Rust by Example translation guidelines
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Please see the [CONTRIBUTING.md] file for general contribution guidelines.
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This file describes about the translation workflow.
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[CONTRIBUTING.md]: https://github.com/rust-lang/rust-by-example/blob/master/CONTRIBUTING.md
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## Translation workflow
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### Preparation
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RBE uses [mdbook-i18n-helpers](https://github.com/google/mdbook-i18n-helpers) as a translation framework.
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The following tools are required.
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* GNU gettext utilities ( `msgmerge` and `msgcat` )
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* mdbook-i18n-helpers ( `cargo install mdbook-i18n-helpers` )
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### Creating and Updating Translations
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Please see the [mdbook-i18n-helpers USAGE](https://github.com/google/mdbook-i18n-helpers/blob/main/i18n-helpers/USAGE.md) file for the detailed usage of mdbook-i18n-helpers.
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The summarized command list is below:
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#### Generating a message template
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The generated message templete `po/messages.pot` is required to create or update translations.
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```bash
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MDBOOK_OUTPUT='{"xgettext": {"pot-file": "messages.pot"}}' \
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mdbook build -d po
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```
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#### Creating a new translation resource
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`xx` is [ISO 639](https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes) language code.
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```bash
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msginit -i po/messages.pot -l xx -o po/xx.po
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```
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#### Updating the exising translation resource
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```bash
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msgmerge --update po/xx.po po/messages.pot
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```
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### Editing translation resources
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After generating a translation resource `po/xx.po`, you can write translation messages in `msgstr` entry of `po/xx.po`.
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To build a translated book, the following command can be used.
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```bash
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MDBOOK_BOOK__LANGUAGE=xx mdbook build
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MDBOOK_BOOK__LANGUAGE=xx mdbook serve
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```
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### Add a language entry
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Please add a language entry in `.github/workflows/rbe.yml` and `theme/index.hbs` like below:
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* `rbe.yml`
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```yml
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env:
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# Update the language picker in index.hbs to link new languages.
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LANGUAGES: xx yy zz
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```
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* `index.hbs`
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```html
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<ul id="language-list" class="theme-popup" aria-label="Languages" role="menu">
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<li role="none"><button role="menuitem" class="theme">
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<a id="en">English</a>
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</button></li>
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<li role="none"><button role="menuitem" class="theme">
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<a id="xx">XX language</a>
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</button></li>
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<li role="none"><button role="menuitem" class="theme">
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<a id="yy">YY language</a>
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</button></li>
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<li role="none"><button role="menuitem" class="theme">
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<a id="zz">ZZ language</a>
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</button></li>
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</ul>
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```

‎book.toml‎

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[output.html]
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git-repository-url = "https://github.com/rust-lang/rust-by-example"
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additional-css = [
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"theme/css/language-picker.css",
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]
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[rust]
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edition = "2021"
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[build]
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extra-watch-dirs = ["po"]
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[preprocessor.gettext]
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after = ["links"]

‎theme/css/language-picker.css‎

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#language-list {
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left: auto;
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right: 10px;
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}
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[dir="rtl"] #language-list {
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left: 10px;
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right: auto;
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}
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#language-list a {
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color: inherit;
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}

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