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<h1 class="container h-card"><a href="http://agaric.com/" id="logo" rel="home" title="Agaric home"><img alt="Agaric home" class="u-logo" height="80" src="http://agaric.com/sites/all/themes/agaric_bootstrap/logo.png" width="80" /></a> <a class="p-name u-url" href="http://agaric.com/" rel="home me" title="Home">Agaric</a> <small>We build online.</small></h1>

/**
 * Implements hook_preprocess_node().
 */
function agaric_bootstrap_preprocess_node(&amp;$variables) {
  if ($variables['type'] == 'blog') {
    $variables['classes_array'][] = 'h-entry';
    if (!isset($variables['title_attributes']['class'])) {
      $variables['title_attributes_array']['class'] = array();
    }
    $variables['title_attributes_array']['class'][] = 'p-name';
    $datetime = format_date($variables['node']-&gt;created, 'custom', 'Y-m-d h:i:s');
    $formatted_date = '<time class="dt-published" datetime="' . $datetime . '">' . $variables['date'] . '</time>';
    $variables['submitted'] = t('Submitted by !username on !datetime', array('!username' =&gt; $variables['name'], '!datetime' =&gt; $formatted_date));
  }
}

<article about="/blogs/marking-drupals-blog-posts-indieweb" class="node node-blog h-entry clearfix" id="node-262" typeof="sioc:Post sioct:BlogPost">

<h1 class="p-name"><a class="u-url" href="http://agaric.com/blogs/marking-drupals-blog-posts-indieweb" rel="bookmark" title="Marking up Drupal's blog posts for the IndieWeb">Marking up Drupal's blog posts for the IndieWeb</a></h1>

<span content="2015-05-04T11:58:16-04:00" datatype="xsd:dateTime" property="dc:date dc:created" rel="sioc:has_creator">Submitted by <a about="/people/benjamin-melan%C3%A7on" class="p-author h-card username" datatype="" href="http://agaric.com/people/benjamin-melan%C3%A7on" property="foaf:name" rel="author" title="View user profile." typeof="sioc:UserAccount" xml:lang="">Benjamin Melançon</a> on <time class="dt-published" datetime="2015-05-04 11:58:16">Mon, 05/04/2015 - 11:58</time></span>
<div class="e-content">…</div>
</article>

source:
  plugin: embedded_data
  data_rows:
    - unique_id: 1
      node_title: 'Date example 1'
      node_creation_date: 'January 1, 2019 19:15:30'
      src_date: '2019/12/1'
      src_date_end: '2019/12/31'
      src_datetime: '2019/12/24 19:15:30'
destination:
  plugin: 'entity:node'
  default_bundle: ud_date
created:
  plugin: format_date
  source: node_creation_date
  from_format: 'F j, Y H:i:s'
  to_format: 'U'
  from_timezone: 'UTC'
  to_timezone: 'UTC'
field_ud_date/value:
  plugin: format_date
  source: src_date
  from_format: 'Y/m/j'
  to_format: 'Y-m-d'
field_ud_date_range/value: '@field_ud_date/value'
field_ud_date_range/end_value:
  plugin: format_date
  source: src_date_end
  from_format: 'Y/m/j'
  to_format: 'Y-m-d'
field_ud_datetime/value:
  plugin: format_date
  source: src_datetime
  from_format: 'Y/m/j H:i:s'
  to_format: 'Y-m-d\TH:i:s'
  from_timezone: 'America/Managua'
  to_timezone: 'UTC'
/**
 * Implements hook_form_alter().
 */
function nicaragua_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {
  if ($form_id == 'node_article_form' || $form_id == 'node_article_edit_form') {
    $form['field_image']['#states'] = [
      'visible' => [
        ':input[name="field_image_or_video"]' => ['value' => 'Image'],
      ],
    ];

    $form['field_video']['#states'] = [
      'visible' => [
        ':input[name="field_image_or_video"]' => ['value' => 'Video'],
      ],
    ];
  }
}

  $form['field_dependent']['#states'] = [
    'visible' => [
      ':input[name="field_controller[value]"]' => ['checked' => TRUE],
    ],
  ];
$form[TARGET_FIELD_NAME]['#states'] = [
  TARGET_FIELD_STATE => [
    CONTROLLING_FIELD_SELECTOR => ['value' => CONTROLLING_FIELD_STATE],
  ],
];

/**
 * Implements hook_field_widget_single_element_WIDGET_TYPE_form_alter().
 */
function nicaragua_field_widget_single_element_paragraphs_form_alter(&$element, \Drupal\Core\Form\FormStateInterface $form_state, $context) {
  /** @var \Drupal\field\Entity\FieldConfig $field_definition */
  $field_definition = $context['items']->getFieldDefinition();
  $paragraph_entity_reference_field_name = $field_definition->getName();

  if ($paragraph_entity_reference_field_name == 'field_sections') {
    /** @see \Drupal\paragraphs\Plugin\Field\FieldWidget\ParagraphsWidget::formElement() */
    $widget_state = \Drupal\Core\Field\WidgetBase::getWidgetState($element['#field_parents'], $paragraph_entity_reference_field_name, $form_state);

    /** @var \Drupal\paragraphs\Entity\Paragraph $paragraph */
    $paragraph_instance = $widget_state['paragraphs'][$element['#delta']]['entity'];
    $paragraph_type = $paragraph_instance->bundle();

    // Determine which paragraph type is being embedded.
    if ($paragraph_type == 'embedded_image_or_video') {
      $controlling_field_name = 'field_image_or_video';
      $selector = sprintf('select[name="%s[%d][subform][%s]"]', $paragraph_entity_reference_field_name, $element['#delta'], $controlling_field_name);

      // Dependent fields.
      $element['subform']['field_image']['#states'] = [
        'visible' => [
          $selector => ['value' => 'Image'],
       ],
      ];

      $element['subform']['field_video']['#states'] = [
        'visible' => [
          $selector => ['value' => 'Video'],
        ],
      ];
    }
  }
}

$field_definition = $context['items']->getFieldDefinition();
$paragraph_entity_reference_field_name = $field_definition->getName();

$field_definition->getName(); // Returns the field_name property. Example: 'field_sections'.
$field_definition->getType(); // Returns the field_type property. Example: 'entity_reference_revisions'.
$field_definition->getTargetEntityTypeId(); // Returns the entity_type property. Example: 'node'.
$field_definition->getTargetBundle(); // Returns the bundle property. Example: 'campaign'.

$widget_state = \Drupal\Core\Field\WidgetBase::getWidgetState($element['#field_parents'], $paragraph_entity_reference_field_name, $form_state);
$paragraph_instance = $widget_state['paragraphs'][$element['#delta']]['entity'];
$paragraph_type = $paragraph_instance->bundle();

$element['subform'][DEPENDENT_FIELD_NAME]['#states'] = [
  DEPENDENT_FIELD_STATE => [
    CONTROLLING_FIELD_SELECTOR => ['value' => CONTROLLING_FIELD_VALUE],
  ],
];

<select data-drupal-selector="edit-field-sections-0-subform-field-image-or-video"
  id="edit-field-sections-0-subform-field-image-or-video--vtQ4eJfmH7k"
  name="field_sections[0][subform][field_image_or_video]"
  class="form-select required"
  required="required"
  aria-required="true">
    <option value="Image" selected="selected">Image</option>
    <option value="Video">Video

$selector = sprintf('select[name="%s[%d][subform][%s]"]', $paragraph_field_name, $element['#delta'], $controlling_field_name);

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What are Agaric's initiatives, you ask?

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PHP date format characters

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Date range migration

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Things to consider

What is the Commons?

The Tech Industry's Role in the Commons Transition

Lead By Example, But Towards Systemic Change

Use and Demand Renewable Energy

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Divest, Invest for the Transition

Unionize to Build Counter Power

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Content style guide

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The Drutopia Initiative

Core values of the Drutopia initiative:

Drutopia encourages:

Strategy - Shared Configuration Management

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Contribute to the Drutopia Initiative

Cooperative Webhosting

The basics: conditional fields in node forms

Conditional fields in Drupal paragraphs

Warning: Javascript behavior does not affect user input

Just one more thing...