supersize: Add Print(idx). Sort subgroups in canned_queries.

tools/binary_size/libsupersize/console.py

 # Copyright 2017 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """An interactive console for looking analyzing .size files."""
 
 import argparse
 import atexit
 import code
 import contextlib
@@ skipping 92 matching lines @@
       ret.symbols = ret.symbols.Sorted()
     return ret
 
   def _PrintFunc(self, obj=None, verbose=False, recursive=False, use_pager=None,
                  to_file=None):
     """Prints out the given Symbol / SymbolGroup / SymbolDiff / SizeInfo.
 
     For convenience, |obj| will be appended to the global "printed" list.
 
     Args:
-      obj: The object to be printed. Defaults to size_infos[-1].
+      obj: The object to be printed. Defaults to size_infos[-1]. Also accepts an
+          index into the |printed| array for showing previous results.
       verbose: Show more detailed output.
       recursive: Print children of nested SymbolGroups.
       use_pager: Pipe output through `less`. Ignored when |obj| is a Symbol.
           default is to automatically pipe when output is long.
       to_file: Rather than print to stdio, write to the given file.
     """
-    if not self._printed_variables or self._printed_variables[-1] != obj:
+    if isinstance(obj, int):
+      obj = self._printed_variables[obj]
+    elif not self._printed_variables or self._printed_variables[-1] != obj:
       self._printed_variables.append(obj)
     obj = obj if obj is not None else self._size_infos[-1]
     lines = describe.GenerateLines(obj, verbose=verbose, recursive=recursive)
     _WriteToStream(lines, use_pager=use_pager, to_file=to_file)
 
   def _ElfPathAndToolPrefixForSymbol(self, symbol, elf_path, tool_prefix):
     size_info = None
     size_path = None
     for size_info, size_path in zip(self._size_infos, self._size_paths):
       if symbol in size_info.raw_symbols:
@@ skipping 220 matching lines @@
                                output_directory=args.output_directory,
                                any_path_within_output_directory=args.inputs[0])
   session = _Session(size_infos, args.inputs, lazy_paths)
 
   if args.query:
     logging.info('Running query from command-line.')
     session.Eval(args.query)
   else:
     logging.info('Entering interactive console.')
     session.GoInteractive()