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Kotlin website

Official project Qodana Code Quality Check

This repository is the source for https://kotlinlang.org.

Website structure

Content

Website page Source files
Main page templates/pages/index.html
Kotlin docs docs/topics
Community pages/community
Education templates/pages/education

Note that source files for the server-side landing page and Kotlin Multiplatform Mobile landing page are not publicly available.

Sources in different repositories

Source files for coroutines and lincheck docs, and the language specification are stored in separate repositories:

Website page GitHub repository
Coroutines docs kotlinx.coroutines
Lincheck docs kotlinx.lincheck
Language specification kotlin-spec

Auto-generated content

API reference documentation is generated based on comments in the Kotlin code. Learn more about documenting the Kotlin code.

The Kotlin grammar reference is generated by the Kotlin grammar generator from the Kotlin grammar definition.

Configuration files

Configuration File
Navigation and structure kr.tree for docs and _nav.yml for other pages
Variables, such as release version v.list for docs and releases.yml for other pages
Community events on the map events.xml
Video list (outdated) videos.yml

Templates

The Kotlin website uses Jinja2 templates from the templates directory. Note that all Markdown files, except for docs, are processed as Jinja templates before HTML conversion. This allows using all Jinja benefits for Markdown (for example, building URLs with the url_for function).

Contribution

You can contribute to the Kotlin website by sending us a pull request. You can also create a YouTrack issue to discuss your suggestion with the Kotlin team.

For the Kotlin documentation, follow these guidelines on style and formatting.

For other pages, follow the complete syntax reference at the kramdown site. You can also include metadata fields. Learn more about it in the Jekyll docs.

Kotlin User Group

To add a Kotlin User Group (KUG), proceed the following way:

  1. Open the configuration file user-groups.yml.

  2. Find a suitable section among existing ones.

  3. Add into the selected section a new group with the following keys:

    • name, the name of the group.
    • country, the name of the country where the group is located. In the case of a virtual group, please use "International" for that.
    • url, the link to the group's web page.
    • isVirtual, set this key with true value if the group is online only.
    • position, the geo-position of the group, defined by pair of keys: lat and lng. It better to run scripts/user_group.

  4. If the group is not virtual, you also need to specify a group's position. You can do it manually adding position key with the lat and lng values, as next:

    position:
  lat: 1.1111111
  lng: 1.1111111

    or, to run the geo script (scripts/user_groups_geolocator.py) that will do it for you. You need to obtain GOOGLE_API_KEY and then run the following script:

    $ GOOGLE_API_KEY="..." python scripts/universities_geolocator.py

    You can find more details about GOOGLE_API_KEY param in this article by Google. The manual way sometimes is better, because it allows you to specify the position more precisely.

You can see the structure and types of the expected configuration in the JSON schema. Once you publish a pull request, the changes will be validated by GitHub Actions Workflow to prevent misconfiguration.

Community Events

To add an event to the Community Events, do the following:

  1. Fill the event info in the events.yml with the next:
    • lang, two-letter code considering ISO 639-1 format.
    • startDate, in the format 'yyyy-mm-dd'.
    • endDate, in the format 'yyyy-mm-dd'. For the on day event fill the same date as in the startDate.
    • location, in the form of 'City, Country'. You can omit it for an online event.
    • online, set this key with true value in case of online event.
    • speaker, the speaker's name.
    • title, event's title.
    • subject, a title of a talk.
    • url, link to the event web page. You can see the structure and types of the expected configuration in the JSON schema.
  2. Publish the changes creating a pull request. The changes will be validated by GitHub Actions Workflow to prevent misconfiguration.

Local deployment

Currently, there is no way to deploy the Kotlin website locally. This ticket tracks the effort of adding support for local testing: KT-47049.

You can contribute to the Kotlin website by sending us a pull request.

Feedback and issues

You can:

Pages on Next.js

You can find all pages in the pages directory.

Projects structure

  • Components. The building blocks.
  • Blocks. Blocks are groups of components joined together to form a relatively complex, distinct section of an interface.
  • Pages. Each page is associated with a route based on its file name.

Images in Next.js

Notice that using next/image is not possible because Next.js does not support importing images to HTML files (SSG). Use Img and Svg components from "next-optimized-images" instead.

Tests

We use Playwright for writing e2e and Screenshot tests. See https://playwright.dev/ for more details.

Prerequirements

To run tests locally:

  1. Install supported browsers:

    npx playwright install

  2. Start Dev Server.

Run Tests

  • yarn test to run all tests in headless mode locally.
  • yarn test:e2e to run e2e tests.
  • yarn test:e2e:headed to run e2e tests in headed mode.
  • yarn test:e2e:debug to run e2e tests in headed mode with debug.
  • yarn test:e2e:new to generate the test for the user interactions.
  • yarn ci:e2e to run e2e test in CI environments.

Write Tests

To write e2e test, create spec file /test/e2e/*your-page*.spec.js.

API references tests

Some tests focus on protecting the HTML markup of API references from being corrupted by the KTL components in the Dokka template's extension. To run these tests locally, follow the next steps:

  1. Create the libs folder in the project.
  2. Open the last successful build of each API reference on TeamCity.
  3. Download the artifacts of these builds and place them in the libs folder by their name, for example, kotlinx.coroutines.
  4. Up containers ./scripts/dokka/up.sh.
  5. Run test inside container ./scripts/dokka/run.sh or on the host with one of the scripts below.

To run visual testing, apply one of the next scripts:

  • yarn test:visual to compare pages with base screenshots. Base screenshots are in test/visual.
  • yarn test:visual:headed to run visual test in headed mode.
  • yarn test:visual:update to update all screenshots, for example, when the page has been changed.
  • yarn ci:visual to run visual test in CI environments.