This is the full script solution for Stack Overflow Q14518410, "a google apps script to move or restore google drive's files from the trash"http://stackoverflow.com/questions/14518410/a-google-apps-script-to-move-or-restore-google-drives-files-from-the-trash

Rescue Files.gs

// See http://stackoverflow.com/questions/14518410/a-google-apps-script-to-move-or-restore-google-drives-files-from-the-trash

var addonName = 'Rescue Files';
var rescueFldrName = 'Rescued Files';    // The name of the folder that rescued files should be placed into

/**
 * Adds an addon menu to the active spreadsheet.
 */
function onOpen() {
  var ui = SpreadsheetApp.getUi();
  ui.createMenu(addonName)
      .addItem('Get trashed file list', 'getTrashedFilesUI')
      .addItem('Rescue Listed files', 'rescueListedFilesUI')
      .addSeparator()
      .addItem('Rescue ALL files', 'rescueAllFilesUI')
      .addToUi();
}

/*********************************************************************************************************
 * User Interface functions poll user for input and report results.
 */

function getTrashedFilesUI() {
  var yesNo = Browser.msgBox(addonName,
                             "Replace current sheet with list of trashed files?",
                             Browser.Buttons.YES_NO);
  if ("yes" == yesNo) {
    getTrashedFiles();
  };
}

function rescueListedFilesUI() {
  var yesNo = Browser.msgBox(addonName,
                             "Rescue trashed files listed in this spreadsheet?",
                             Browser.Buttons.YES_NO);
  if ("yes" == yesNo) {
    var count = rescueListedFiles();
    Browser.msgBox("Rescued " + count + " Files");
  };
}

function rescueAllFilesUI() {
  var yesNo = Browser.msgBox(addonName,
                             "Rescue ALL trashed files?",
                             Browser.Buttons.YES_NO);
  if ("yes" == yesNo) {
    var count = rescueAllFiles();
    Browser.msgBox("Rescued " + count + " Files");
  };
}

/*********************************************************************************************************
 * Primary operation functions
 */

/**
 * Get array of files in user's Google Drive trash.
 * From: http://stackoverflow.com/a/14541247/1677912
 * 
 * @returns   {Object[]}   Array of DriveApp file objects
 */
function getTrashedFiles() {
  var trashedSearch = DriveApp.searchFiles('trashed=true');
  var files = [];
  files.push(["ID","File Name","Type","URL"]);
  while (trashedSearch.hasNext()) {
    var file = trashedSearch.next();
    files.push([file.getId(),file.getName(),docTypeToText_(file.getMimeType()),file.getUrl()]);
  }
  var sheet = SpreadsheetApp.getActiveSheet();
  sheet.clear();
  sheet.getRange(1, 1, files.length, files[0].length)
       .setValues(files);
  return files;
}

/**
 * Untrash then move files listed in spreadsheet to rescue folder.
 * From: http://stackoverflow.com/a/14541247/1677912
 * 
 * @returns {Number}   Count of Rescued files.
 */
function rescueListedFiles() {
  var fileList = SpreadsheetApp.getActiveSheet()
                               .getDataRange().getValues()
                               .splice(1);  // Skip header line
  // Find or create target folder
  var rescueFldrIterator = DriveApp.getFoldersByName(rescueFldrName);
  var rescueFldr = rescueFldrIterator.hasNext() ? rescueFldrIterator.next() : DriveApp.createFolder(rescueFldrName);
  
  var count = 0;  
  for (var i=0; i<fileList.length; i++) {
    var fileId = fileList[i][0];
    var file = DriveApp.getFileById(fileId);
    // Untrash the file
    if (rescueFile( file, rescueFldr )) count++;
  }
  return( count );
};

/**
 * Untrash then move all trashed files to rescue folder.
 * From: http://stackoverflow.com/a/14541247/1677912
 * 
 * @returns {Number}   Count of Rescued files.
 */
function rescueAllFiles() {
  // Find or create target folder
  var rescueFldrIterator = DriveApp.getFoldersByName(rescueFldrName);
  var rescueFldr = rescueFldrIterator.hasNext() ? rescueFldrIterator.next() : DriveApp.createFolder(rescueFldrName);
  
  // Get file iterator with all trashed files
  var trashed = DriveApp.searchFiles('trashed=true');
  
  var count = 0;
  while (trashed.hasNext()) {
    var file = trashed.next();
    // Untrash the file
    if (rescueFile( file, rescueFldr )) count++;
  }
  return(count);
};


/*********************************************************************************************************
 * Utility functions
 */

/**
 * Rescue given file from trash, if there.
 *
 * @param {File}    file         DriveApp File object to be rescued
 * @param {Folder}  rescueFldr   DriveApp Folder object to receive rescued file
 *
 * @returns {Boolean}            `true` if file rescued.
 */
function rescueFile( file, rescueFldr ) {
  if (file.isTrashed()) {
    // Untrash the file
    file.setTrashed(false);
    // Unlink any & all folders this file used to appear in
    var oldFolders = file.getParents();
    while (oldFolders.hasNext()) {
      oldFolders.next().removeFile(file);
    }
    // Link the Rescued file to target directory.
    rescueFldr.addFile(file);
    
    Logger.log("Rescued: "+ JSON.stringify(getFileInfo(file)));
    
    return( true );
  }
  else
    // Nothing to do
    return( false );
}

/**
/**
 * Return an object containing relevant information about the given file.
 * See https://developers.google.com/apps-script/class_file.
 * From: https://gist.github.com/mogsdad/4644369
 *
 * @param {Object}  file   File or Folder object to examine.
 *
 * @return {Object}        Interesting file attributes.
 * <pre>{
 *     id: unique id (ID) of the folder or file
 *     name: the name of the File
 *     size: the size of the File
 *     type: The type of the file
 *     created: date that the File was created
 *     description: the description of the File
 *     owner: user id of the owner of the File
 *     otherViewers: list of user ids of viewers of the File, w/o owner
 *     otherEditors: list of user ids of editors of the File, w/o owner
 * }</pre>
 */
function getFileInfo (file) {
  var fileInfo = {
    id: file.getId(),
    name: file.getName(), 
    size: file.getSize(),
    type: (file.getMimeType) ? docTypeToText_(file.getMimeType()) : "folder",  // DriveApp Folders don't have getMimeType() method.
    created: file.getDateCreated(),
    description: file.getDescription(),
    owner: userNames([file.getOwner()],false),
    otherViewers: userNames(file.getViewers(),true),
    otherEditors: userNames(file.getEditors(),true)
    };
  return fileInfo;
}

/**
 * Return string representation of a Document Type.
 *
 * @param {FileType} type Enum as defined in https://developers.google.com/apps-script/class_docslist_filetype.
 * @return {String} String matching the provided type. "UNKNOWN" if type was not known.
 */
function docTypeToText_(type) {
  var typeText = "";
  
  switch (type) {
    case MimeType.GOOGLE_DOCS:
      typeText = "DOCUMENT";
      break;
    case MimeType.GOOGLE_DRAWINGS:
      typeText = "DRAWING";
      break;
    case MimeType.GOOGLE_SLIDES:
      typeText = "SLIDES";
      break;
    case MimeType.GOOGLE_SHEETS:
      typeText = "SPREADSHEET";
      break;
    case MimeType.FOLDER:
      typeText = "FOLDER";
      break;
    case MimeType.GOOGLE_APPS_SCRIPT:
      typeText = "SCRIPT";
      break;
    case MimeType.GOOGLE_FORMS:
      typeText = "FORM";
      break;
    default:
      typeText = type;
      break;
  }
  
  return typeText;
}

/**
 * Return a comma-separated list of user IDs, from an array of Class User.
 *
 * @param {array} users Array of Class User.
 * @param {boolean} skipOwner If true, do not include file owner in results
 *
 * @returns {string} Comma-sparated list of user IDs.
 */
function userNames( users, skipOwner ) {
  var retval = "";
  var startAt = skipOwner ? 1 : 0; // Owner listed first in editors & viewers lists 
  if (users.length <= startAt) {
    retval = "none";
  }
  else {
    for (var i=startAt; i<users.length; i++) {
      if (i > startAt) retval += ", "
      var userId = "";
      try {
        userId = users[i].getEmail()//.getUserLoginId()
      } catch(e)
      {
        // Possible permission problem
        userId = "unknown";
      }
      retval += userId;
    }
  }
  return retval
}

/**
 * Get array of files on user's Google Drive that have been shared with them.
 * From http://stackoverflow.com/a/15947340/1677912
 *
 * @returns   {Array}   Array of file resources
 *                      (see https://developers.google.com/drive/v2/reference/files#resource)
 */
function getSharedWithMe() {
  var optionalArgs = {q:"sharedWithMe=true"};
  var sharedFiles = Drive.Files.list(optionalArgs);
  debugger;  // pause in debugger
  return sharedFiles.items;
}