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When running the build or serve commands, you can specify a Bridgetown environment variable: BRIDGETOWN_ENV. The build will then apply this value in any conditional statements in your content. You specify the environment by prepending it to your command:

BRIDGETOWN_ENV=production bridgetown build

Alternatively, you can set the environment value using your computer or server settings…most hosting companies allow environment variables to be specified via a control panel of some kind. Or at the command line, look for a .bashrc or .zshrc file in your home folder and add:

export BRIDGETOWN_ENV="production"

For example, suppose you set this conditional statement in your code:

{% if bridgetown.environment == "production" %}
   {% include disqus.html %}
{% endif %}

When you build your Bridgetown site, the content inside the if statement won’t be rendered unless you also specify a production environment.

The default value for BRIDGETOWN_ENV is development. Thus if you omit BRIDGETOWN_ENV from the build/serve commands, the default value will be BRIDGETOWN_ENV="development". Any content inside {% if bridgetown.environment == "development" %} tags will automatically appear in the build.

Your environment values can be anything you want (not just development or production). Some elements you might want to hide in development environments include Disqus comment forms or Google Analytics. Conversely, you might want to expose an “Edit me in GitHub” button in a development environment but not include it in production environments.

Environment-specific Configurations

In your bridgetown.config.yml config file, as well as the src/_data/site_metadata.yml metadata file, you can add a block of YAML options per environment. For example, given the following metadata:

# src/_data/site_metadata.yml

title: My Website

  title: My (DEV) Website

Your site title would be “My Website” if built with a production environment, and “My (DEV) Website” if built with a development environment. You can specify any number of environment blocks that you wish. For example:

# bridgetown.config.yml

  unpublished: true
  future: true

  unpublished: true

The development environment will build documents that are marked as unpublished as well as having a future date, whereas the staging environment will only build unpublished. And the production environment would exclude both sets.

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