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The Dart language site (dart.dev)

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The https://dart.dev site, built with Jekyll and hosted on Firebase.

We welcome contributions, and we're first-timer friendly!

Getting started

Start by looking for an issue that catches your interest, or create an issue with your proposed change. Ask for the issue to be assigned to you.

To update this site, fork the repo, make your changes, and generate a pull request. For simple changes (such as to CSS and text), you probably don't need to build this site. Often you can make changes using the GitHub UI.

NOTE: If you clone this repo locally, see the instructions below on cloning with its submodule.

If your change involves code samples, adds/removes pages, or affects navigation, you'll need to build and test your work before submitting.

If you want or need to build, follow the steps below.

Help us improve these instructions! If you have any problems getting set up to build or performing the actual build, please edit this README or file an issue (or both).

Before you build this site

1. Get the prerequisites

Install the following tools if you don't have them already.

  • bash, the Bourne shell. These instructions assume you're using bash; setup might not work if you use another shell.

  • nvm, the Node Version Manager.

    NOTE: To make nvm immediately available in your current shell, run source <PATH_TO_INSTALLATION>. For example:

    $ source ~/.nvm/nvm.sh
  • rvm, the Ruby Version Manager.

    NOTE: To make rvm immediately available in your current shell, run source <PATH_TO_INSTALLATION>. For example:

    $ source ~/.rvm/bin/rvm
  • Dart

  • GNU diffutils version 3.6 or later.

    NOTE: diff v3.6+ is required to ensure that in-page code diffs are consistently refreshed across macOS and Linux. To upgrade diffutils on macOS run:

    $ brew install diffutils

IMPORTANT: Follow the installation instructions for each of the tools carefully. In particular, configure your shell/environment so that the tools are available in every terminal/command window you create.

2. Clone this repo and its submodule

NOTE: This repo has a git submodule, which affects how you clone it.

To clone this repo (site-www), follow the instructions given in the GitHub help on Cloning a repository, and choose one of the following submodule-cloning techniques:

  • Clone this repo and its submodule at the same, use the --recurse-submodules option:

    $ git clone --recurse-submodules https://github.com/dart-lang/site-www.git

    OR

  • If you've already cloned this repo without its submodule, then run this command from the repo root:

    $ git submodule update --init --remote

IMPORTANT: Whenever you update your repo, update the submodule as well:
git pull; git submodule update --init --remote

3. Run installation scripts

NOTE: It is safe to (re-)run all of the commands and scripts given below even if you already have the required packages installed.

Open a bash terminal/command window and execute the following commands:

  1. After you have cloned this repo, change to the root of this repo:

    $ cd <PATH_TO_REPO>
  2. Run the env-set.sh script to initialize environment variables, and to install/use required Node & Ruby version:

    $ source ./tool/env-set.sh
  3. Run before-install.sh to install the core set of required tools:

    $ ./tool/before-install.sh
  4. Run install.sh to install everything else needed to build this site:

    $ ./tool/install.sh

You may need to run gem install bundler to upgrade it to the latest version if you get errors such as require: cannot load such file later. Another command that seems to be useful when the usual installation process doesn't work is bundle install --force.

IMPORTANT:

  • Any time you create a new terminal/command window to work on this repo, repeat steps 1 and 2 above.

Building this site

Once everything is installed, you need to do a full site build at least once:

$ jekyll build # full site build

The generated site is placed in the _site folder. To serve this folder use:

$ npx superstatic --port 4000

Or, if you aren't testing redirects, use this command (which has the bonus of autorefreshing your browser after edits):

$ jekyll serve --livereload

To view the generated site open localhost:4000.

You can build, serve, and have a watcher for changes by running the following command:

$ ./tool/serve.sh

Pre-push checks

If you've made changes to this site's documentation and committed locally, then run the following command before pushing your work:

$ ./tool/pre-push.sh

If the script reports errors or warnings, then address the issues and rerun the script. Otherwise, you can push your changes.

Site checks

Checking example code

If you've made changes to the example code run the following commands:

$ ./tool/dartformat.sh
$ ./tool/refresh-code-excerpts.sh
$ ./tool/analyze-and-test-examples.sh --quick

If the last command reports failed tests and you'd like to know which test failed, then rerun the command without the -q flag.

Checking the site's HTML

  1. Build the site and launch the server:

    $ jekyll build && npx superstatic --port 4000
  2. Next, to check for broken links, run this from the top of the repo:

    $ ./tool/shared/check-links.sh

    To also check external URLs (which is much slower), run the linkcheck command with the --external (or -e, for short) option.

    With this tool you can check any URL by simply specifying it as a parameter:

    $ dart pub global activate linkcheck
    $ linkcheck https://dart.dev

    To check for valid HTML, good images, and broken links (though not as well as linkcheck.dart), run this from the top of the repo: NOTE: As of April 16, 2019, this doesn't work. See issue #1461.

    $ ./deploy/html_proof.rb

    To find old links (from the site version before this one) that are broken, use these commands:

    $ ./tool/serve.sh &
    $ linkcheck -i deploy/urls/old_site_urls.txt

Staging the site

  1. Save your changes. For example, from the top directory:

    $ git commit src
    
  2. Create a pull request by pushing your branch to GitHub.

    $ git push origin <branchname>
  3. Navigate to the Firebase console, console.firebase.google.com.

  4. If you don't already have a project to stage to, create it:

    1. Select Create New Project.
    2. Enter a project name in the dialog, such as staging-1.
    3. Click Create Project. This takes you to the page for your new project.

    Note: To keep the number of projects under control, we reuse them. Our naming convention is <first initial><last initial>-dart-dev-<number>. For example, sz-dart-dev-1 and kw-dart-dev-1.

  5. Build the docs, to get the latest changes:

    $ jekyll build
  6. Return to the Firebase console, and get the name of your project (e.g. sz-dart-dev-2), which the following step calls FB-NAME.

  7. Deploy the docs, substituting the name of your project for FB-NAME:

    $ ./tool/shared/deploy.sh --local FB-NAME

    You can now navigate to the staged version at https://<your-instance>.firebaseapp.com -— for example, https://sz-dart-dev-2.firebaseapp.com.

  8. Navigate to the PR on GitHub and update it with the location of the staged version, the names of your reviewers, and so on.

Troubleshooting the build

See the Troubleshooting wiki page.

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