Initial commit of new farm_map_kml module - provides a KML export action for farmOS geometry fields.

modules/farm/farm_map/farm_map_kml/farm_map_kml.info

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+name = Farm Map KML
+description = Provides KML features for farm maps.
+core = 7.x
+package = farmOS
+dependencies[] = farm_map
+dependencies[] = geophp

modules/farm/farm_map/farm_map_kml/farm_map_kml.module

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+<?php
+
+/**
+ * @file
+ * Farm map KML.
+ */
+
+/**
+ * Implements hook_theme().
+ */
+function farm_map_kml_theme($existing, $type, $theme, $path) {
+  return array(
+    'farm_map_kml' => array(
+      'variables' => array(
+        'content' => NULL,
+        'placemarks' => array(),
+      ),
+      'template' => 'farm_map_kml',
+      'file' => 'farm_map_kml.theme.inc',
+    ),
+    'farm_map_kml_placemark' => array(
+      'variables' => array(
+        'pid' => NULL,
+        'name' => NULL,
+        'description' => NULL,
+        'geometry' => NULL,
+        'kml' => NULL,
+      ),
+      'template' => 'farm_map_kml_placemark',
+      'file' => 'farm_map_kml.theme.inc',
+    ),
+  );
+}
+
+/**
+ * Implements hook_action_info().
+ */
+function farm_map_kml_action_info() {
+  return array(
+    'farm_map_kml_action' => array(
+      'type' => 'entity',
+      'label' => t('KML'),
+      'triggers' => array('any'),
+      'configurable' => FALSE,
+      'aggregate' => TRUE,
+    ),
+  );
+}
+
+/**
+ * Action function for farm_map_kml_action.
+ *
+ * Creates a KML file containing shapes from selected entities.
+ *
+ * @param array $entities
+ *   An array of entities.
+ * @param array $context
+ *   Array with parameters for this action.
+ */
+function farm_map_kml_action(array $entities, $context = array()) {
+
+  // Iterate through the entities to generate placemarks.
+  $placemarks = array();
+  foreach ($entities as $entity) {
+
+    // Get the geometry. If it is empty, skip the entity.
+    if (empty($entity->field_farm_geofield[LANGUAGE_NONE][0]['geom'])) {
+      continue;
+    }
+    $geometry = $entity->field_farm_geofield[LANGUAGE_NONE][0]['geom'];
+
+    // Get the entity id and label.
+    list($id, $rid, $bundle) = entity_extract_ids($context['entity_type'], $entity);
+    $label = entity_label($context['entity_type'], $entity);
+
+    // Create a placemark.
+    $placemark = array(
+      'pid' => $id,
+      'name' => $label,
+      'geometry' => $geometry,
+    );
+
+    // If this is an area entity (taxonomy_term), add the description.
+    if ($context['entity_type'] == 'taxonomy_term' && $entity->vocabulary_machine_name == 'farm_areas') {
+      if (!empty($entity->description)) {
+        $placemark['description'] = $entity->description;
+      }
+    }
+
+    // Add the placemark to the list.
+    $placemarks[] = $placemark;
+  }
+
+  // If there are no placemarks, bail with a warning.
+  if (empty($placemarks)) {
+    drupal_set_message(t('No placemarks were found.'), 'warning');
+    return;
+  }
+
+  // Create KML output.
+  $kml = theme('farm_map_kml', array('placemarks' => $placemarks));
+
+  // Ensure that a directory exists to store the KML file in.
+  $directory = 'public://kml';
+  file_prepare_directory($directory, FILE_CREATE_DIRECTORY);
+
+  // Create the temporary KML file.
+  $filename = 'kml_export-' . date('c') . '.kml';
+  $destination = $directory . '/' . $filename;
+  $file = file_save_data($kml, $destination);
+
+  // Make the file temporary.
+  $file->status = 0;
+  file_save($file);
+
+  // Show a link to the file.
+  $message = 'KML file created: <a href="!path">%filename</a>';
+  $args = array(
+    '!path' => file_create_url($file->uri),
+    '%filename' => $file->filename,
+  );
+  drupal_set_message(t($message, $args));
+}

modules/farm/farm_map/farm_map_kml/farm_map_kml.theme.inc

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+<?php
+
+/**
+ * @file
+ * Farm map theme functions.
+ */
+
+/**
+ * Template preprocessor for farm map KML output.
+ */
+function template_preprocess_farm_map_kml(&$vars) {
+
+  // If content is not set, initialize it as an empty string.
+  if (!isset($vars['content'])) {
+    $vars['content'] = '';
+  }
+
+  // Add placemarks to the content.
+  foreach ($vars['placemarks'] as $placemark) {
+    $vars['content'] .= theme('farm_map_kml_placemark', $placemark);
+  }
+}
+
+/**
+ * Template preprocessor for farm map KML placemark output.
+ */
+function template_preprocess_farm_map_kml_placemark(&$vars) {
+
+  // If KML is not set, initialize it as an empty string.
+  if (!isset($vars['kml'])) {
+    $vars['kml'] = '';
+  }
+
+  // If there is a geometry, convert it to KML and append it.
+  if (!empty($vars['geometry'])) {
+
+    // Load GeoPHP.
+    geophp_load();
+
+    // Create a geometry object.
+    $geometry = geoPHP::load($vars['geometry'], 'wkt');
+
+    // Convert the geometry to KML.
+    $kml = $geometry->out('kml');
+
+    // Append the KML to the output.
+    $vars['kml'] .= $kml . "\n";
+  }
+}

modules/farm/farm_map/farm_map_kml/farm_map_kml.tpl.php

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+<?php print '<?xml version="1.0" encoding="UTF-8"?>'; ?>
+
+<kml xmlns = "http://earth.google.com/kml/2.1">
+  <Document>
+<?php if (!empty($content)) print $content; ?>
+  </Document>
+</kml>

modules/farm/farm_map/farm_map_kml/farm_map_kml_placemark.tpl.php

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+    <Placemark id="<?php print $pid; ?>">
+      <name><?php print $name; ?></name>
+      <?php if (!empty($description)): ?><description><?php print $description; ?></description><?php endif; ?>
+<?php if (!empty($kml)) print $kml; ?>
+    </Placemark>