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+<?php
+
+/**
+ * @file
+ * Example drush command.
+ *
+ * To run this *fun* command, execute `sudo drush --include=./examples mmas`
+ * from within your drush directory.
+ *
+ * See `drush topic docs-commands` for more information about command authoring.
+ *
+ * You can copy this file to any of the following
+ *   1. A .drush folder in your HOME folder.
+ *   2. Anywhere in a folder tree below an active module on your site.
+ *   3. /usr/share/drush/commands (configurable)
+ *   4. In an arbitrary folder specified with the --include option.
+ *   5. Drupal's /drush or /sites/all/drush folders, or in the /drush
+ *        folder in the directory above the Drupal root.
+ */
+
+/**
+ * Implements hook_drush_command().
+ *
+ * In this hook, you specify which commands your
+ * drush module makes available, what it does and
+ * description.
+ *
+ * Notice how this structure closely resembles how
+ * you define menu hooks.
+ *
+ * See `drush topic docs-commands` for a list of recognized keys.
+ */
+function sandwich_drush_command() {
+  $items = array();
+
+  // The 'make-me-a-sandwich' command.
+  $items['make-me-a-sandwich'] = array(
+    'description' => "Makes a delicious sandwich.",
+    'arguments' => array(
+      'filling' => 'The type of the sandwich (turkey, cheese, etc.). Defaults to ascii.',
+    ),
+    'options' => array(
+      'spreads' => array(
+        'description' => 'Comma delimited list of spreads.',
+        'example-value' => 'mayonnaise,mustard',
+      ),
+    ),
+    'examples' => array(
+      'drush mmas turkey --spreads=ketchup,mustard' => 'Make a terrible-tasting sandwich that is lacking in pickles.',
+    ),
+    'aliases' => array('mmas'),
+    // No bootstrap at all.
+    'bootstrap' => DRUSH_BOOTSTRAP_NONE,
+  );
+
+  // The 'sandwiches-served' command.  Informs how many 'mmas' commands
+  // completed.
+  $items['sandwiches-served'] = array(
+    'description' => "Report how many sandwiches we have made.",
+    'examples' => array(
+      'drush sandwiches-served' => 'Show how many sandwiches we have served.',
+    ),
+    'aliases' => array('sws'),
+    // Example output engine data:  command returns a single keyed
+    // data item (e.g. array("served" => 1)) that can either be
+    // printed with a label (e.g. "served: 1"), or output raw with
+    // --pipe (e.g. "1").
+    'engines' => array(
+      'outputformat' => array(
+        'default' => 'key-value',
+        'pipe-format' => 'string',
+        'label' => 'Sandwiches Served',
+        'require-engine-capability' => array('format-single'),
+      ),
+    ),
+    // No bootstrap at all.
+    'bootstrap' => DRUSH_BOOTSTRAP_NONE,
+  );
+
+  // The 'spreads-status' command.  Prints a table about available spreads.
+  $items['spreads-status'] = array(
+    'description' => "Show a table of information about available spreads.",
+    'examples' => array(
+      'drush spreads-status' => 'Show a table of spreads.',
+    ),
+    'aliases' => array('sps'),
+    // Example output engine data:  command returns a deep array
+    // that can either be printed in table format or as a json array.
+    'engines' => array(
+      'outputformat' => array(
+        'default' => 'table',
+        'pipe-format' => 'json',
+        // Commands that return deep arrays will usually use
+        // machine-ids for the column data.  A 'field-labels'
+        // item maps from the machine-id to a human-readable label.
+        'field-labels' => array(
+          'name' => 'Name',
+          'description' => 'Description',
+          'available' => 'Num',
+          'taste' => 'Taste',
+        ),
+        // In table format, the 'column-widths' item is consulted
+        // to determine the default weights for any named column.
+        'column-widths' => array(
+          'name' => 10,
+          'available' => 3,
+        ),
+        'require-engine-capability' => array('format-table'),
+      ),
+    ),
+    // No bootstrap at all.
+    'bootstrap' => DRUSH_BOOTSTRAP_NONE,
+  );
+
+  // Commandfiles may also add topics.  These will appear in
+  // the list of topics when `drush topic` is executed.
+  // To view this topic, run `drush --include=/full/path/to/examples topic`
+  $items['sandwich-exposition'] = array(
+    'description' => 'Ruminations on the true meaning and philosophy of sandwiches.',
+    'hidden' => TRUE,
+    'topic' => TRUE,
+    'bootstrap' => DRUSH_BOOTSTRAP_NONE,
+    'callback' => 'drush_print_file',
+    'callback arguments' => array(dirname(__FILE__) . '/sandwich-topic.txt'),
+  );
+
+  return $items;
+}
+
+/**
+ * Implements hook_drush_help().
+ *
+ * This function is called whenever a drush user calls
+ * 'drush help <name-of-your-command>'. This hook is optional. If a command
+ * does not implement this hook, the command's description is used instead.
+ *
+ * This hook is also used to look up help metadata, such as help
+ * category title and summary.  See the comments below for a description.
+ */
+function sandwich_drush_help($section) {
+  switch ($section) {
+    case 'drush:make-me-a-sandwich':
+      return dt("This command will make you a delicious sandwich, just how you like it.");
+
+    // The 'title' meta item is used to name a group of
+    // commands in `drush help`.  If a title is not defined,
+    // the default is "All commands in ___", with the
+    // specific name of the commandfile (e.g. sandwich).
+    // Command files with less than four commands will
+    // be placed in the "Other commands" section, _unless_
+    // they define a title.  It is therefore preferable
+    // to not define a title unless the file defines a lot
+    // of commands.
+    case 'meta:sandwich:title':
+      return dt("Sandwich commands");
+
+    // The 'summary' meta item is displayed in `drush help --filter`,
+    // and is used to give a general idea what the commands in this
+    // command file do, and what they have in common.
+    case 'meta:sandwich:summary':
+      return dt("Automates your sandwich-making business workflows.");
+  }
+}
+
+/**
+ * Implements drush_hook_COMMAND_validate().
+ *
+ * The validate command should exit with
+ * `return drush_set_error(...)` to stop execution of
+ * the command.  In practice, calling drush_set_error
+ * OR returning FALSE is sufficient.  See drush.api.php
+ * for more details.
+ */
+function drush_sandwich_make_me_a_sandwich_validate() {
+  if (drush_is_windows()) {
+    // $name = drush_get_username();
+    // @todo Implement check for elevated process using w32api
+    // as sudo is not available for Windows
+    // @see http://php.net/manual/en/book.w32api.php
+    // @see http://social.msdn.microsoft.com/Forums/en/clr/thread/0957c58c-b30b-4972-a319-015df11b427d
+  }
+  else {
+    $name = posix_getpwuid(posix_geteuid());
+    if ($name['name'] !== 'root') {
+      return drush_set_error('MAKE_IT_YOUSELF', dt('What? Make your own sandwich.'));
+    }
+  }
+}
+
+/**
+ * Implements drush_hook_COMMAND().
+ *
+ * The command callback is where the action takes place.
+ *
+ * The function name should be same as command name but with dashes turned to
+ * underscores and 'drush_commandfile_' prepended, where 'commandfile' is
+ * taken from the file 'commandfile.drush.inc', which in this case is
+ * 'sandwich'. Note also that a simplification step is also done in instances
+ * where the commandfile name is the same as the beginning of the command name,
+ * "drush_example_example_foo" is simplified to just "drush_example_foo".
+ * To also implement a hook that is called before your command, implement
+ * "drush_hook_pre_example_foo".  For a list of all available hooks for a
+ * given command, run drush in --debug mode.
+ *
+ * If for some reason you do not want your hook function to be named
+ * after your command, you may define a 'callback' item in your command
+ * object that specifies the exact name of the function that should be
+ * called.
+ *
+ * In this function, all of Drupal's API is (usually) available, including
+ * any functions you have added in your own modules/themes.
+ *
+ * @see drush_invoke()
+ * @see drush.api.php
+ */
+function drush_sandwich_make_me_a_sandwich($filling = 'ascii') {
+  $str_spreads = '';
+  // Read options with drush_get_option. Note that the options _must_
+  // be documented in the $items structure for this command in the 'command'
+  // hook. See `drush topic docs-commands` for more information.
+  if ($spreads = drush_get_option('spreads')) {
+    $list = implode(' and ', explode(',', $spreads));
+    $str_spreads = ' with just a dash of ' . $list;
+  }
+  $msg = dt('Okay. Enjoy this !filling sandwich!str_spreads.',
+            array('!filling' => $filling, '!str_spreads' => $str_spreads)
+         );
+  drush_print("\n" . $msg . "\n");
+
+  if (drush_get_context('DRUSH_NOCOLOR')) {
+    $filename = dirname(__FILE__) . '/sandwich-nocolor.txt';
+  }
+  else {
+    $filename = dirname(__FILE__) . '/sandwich.txt';
+  }
+  drush_print(file_get_contents($filename));
+  // Find out how many sandwiches have been served, and set
+  // the cached value to one greater.
+  $served = drush_sandwich_sandwiches_served();
+  drush_cache_set(drush_get_cid('sandwiches-served'), $served + 1);
+}
+
+/**
+ * Implements drush_hook_COMMAND().
+ *
+ * Demonstrates how to return a simple value that is transformed by
+ * the selected formatter to display either with a label (using the
+ * key-value formatter) or as the raw value itself (using the string formatter).
+ */
+function drush_sandwich_sandwiches_served() {
+  $served = 0;
+  $served_object = drush_cache_get(drush_get_cid('sandwiches-served'));
+  if ($served_object) {
+    $served = $served_object->data;
+  }
+  // In the default format, key-value, this return value
+  // will print " Sandwiches Served    :  1".  In the default pipe
+  // format, only the array value ("1") is returned.
+  return $served;
+}
+
+/**
+ * Implements drush_hook_COMMAND().
+ *
+ * This ficticious command shows how a deep array can be constructed
+ * and used as a command return value that can be output by different
+ * output formatters.
+ */
+function drush_sandwich_spreads_status() {
+  return array(
+    'ketchup' => array(
+      'name' => 'Ketchup',
+      'description' => 'Some say its a vegetable, but we know its a sweet spread.',
+      'available' => '7',
+      'taste' => 'sweet',
+    ),
+    'mayonnaise' => array(
+      'name' => 'Mayonnaise',
+      'description' => 'A nice dairy-free spead.',
+      'available' => '12',
+      'taste' => 'creamy',
+    ),
+    'mustard' => array(
+      'name' => 'Mustard',
+      'description' => 'Pardon me, but could you please pass that plastic yellow bottle?',
+      'available' => '8',
+      'taste' => 'tangy',
+    ),
+    'pickles' => array(
+      'name' => 'Pickles',
+      'description' => 'A necessary part of any sandwich that does not taste terrible.',
+      'available' => '63',
+      'taste' => 'tasty',
+    ),
+  );
+}
+
+/**
+ * Command argument complete callback.
+ *
+ * Provides argument values for shell completion.
+ *
+ * @return array
+ *   Array of popular fillings.
+ */
+function sandwich_make_me_a_sandwich_complete() {
+  return array('values' => array('turkey', 'cheese', 'jelly', 'butter'));
+}