first import

sites/all/modules/i18n/i18n_variable/i18n_variable.install

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+<?php
+
+/**
+ * @file
+ * Installation file for Internationalization (i18n) module.
+ */
+
+/**
+ * Implements hook_install().
+ */
+function i18n_variable_install() {
+  // Set module weight for it to run before most modules, but after variable_realm
+  db_query("UPDATE {system} SET weight = -900 WHERE name = 'i18n_variable' AND type = 'module'");
+  // Update from d6, module changed name
+  if (variable_get('i18n_drupal6_update')) {
+    i18n_variable_update_7000();
+    i18n_variable_update_7001();
+    i18n_variable_update_7002();
+  }
+  // Set some minimum variables to be translated.
+  variable_set('variable_realm_list_language', array('site_name', 'site_slogan'));
+}
+
+/**
+ * Implements hook_install().
+ */
+function i18n_variable_uninstall() {
+  if (drupal_load('module', 'variable_store')) {
+    // Delete all our variables from store.
+    variable_store_delete_all('language', NULL);
+  }
+}
+
+/**
+ * Update multilingual variables variable name
+ */
+function i18n_variable_update_7000() {
+  variable_set('i18n_variable_list', variable_get('i18n_variables', array()));
+  variable_set('i18n_variable_conf', variable_get('i18n_variables', array()));
+  variable_del('i18n_variables');
+}
+
+/**
+ * Move variables from old storage to new table
+ */
+function i18n_variable_update_7001() {
+  drupal_load('module', 'variable_store');
+  foreach (db_select('i18n_variable', 'v')->fields('v')->execute()->fetchAll() as $variable) {
+    variable_store_set('language', $variable->language, $variable->name, unserialize($variable->value));
+  }
+}
+
+/**
+ * Drop i18n_variable table if exists
+ */
+function i18n_variable_update_7002() {
+  if (db_table_exists('i18n_variable')) {
+    db_drop_table('i18n_variable');
+  }
+}
+
+/**
+ * Update list of realm variables.
+ */
+function i18n_variable_update_7003() {
+  drupal_load('module', 'variable_store');
+  $variable_list = variable_get('i18n_variable_conf', array());
+  variable_set('variable_realm_list_language', $variable_list);
+  // Delete old variables from store that are not in the list.
+  $old_variables = array_diff(variable_store_list_all('language'), variable_children($variable_list));
+  foreach ($old_variables as $name) {
+    variable_store_delete_all('language', NULL, $name);
+  }
+}
+
+/**
+ * Delete obsoleted variable realm variables.
+ */
+function i18n_variable_update_7004() {
+  variable_del('i18n_variable_conf');
+  variable_del('i18n_variable_list');
+}
+