supersize: Add "diff" command

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 188 matching lines @@
     cls._readline_initialized = True
     # Without initializing readline, arrow keys don't even work!
     readline.parse_and_bind('tab: complete')
     history_file = os.path.join(os.path.expanduser('~'),
                                 '.binary_size_query_history')
     if os.path.exists(history_file):
       readline.read_history_file(history_file)
     atexit.register(lambda: readline.write_history_file(history_file))
 
   def Eval(self, query):
-    eval_result = eval(query, self._variables)
-    if eval_result:
-      self._PrintFunc(eval_result)
+    exec query in self._variables
 
   def GoInteractive(self):
     _Session._InitReadline()
     code.InteractiveConsole(self._variables).interact(self._CreateBanner())
 
 
 def AddArguments(parser):
   parser.add_argument(
       'inputs', nargs='+',
       help='Input .size files to load. For a single file, it will be mapped to '
            'the variable "size_info". For multiple inputs, the names will be '
            'size_info1, size_info2, etc.')
-  parser.add_argument(
-      '--query', help='Print the result of the given snippet. Example: '
-                      'size_info.symbols.WhereInSection("d")'
-                      '.WhereBiggerThan(100)')
+  parser.add_argument('--query',
+                      help='Execute the given snippet. '
+                           'Example: Print(size_info)')
   parser.add_argument('--tool-prefix', default='',
                       help='Path prefix for objdump. Required only for '
                            'Disassemble().')
   parser.add_argument('--output-directory',
                       help='Path to the root build directory. Used only for '
                            'Disassemble().')
 
 
 def Run(args, parser):
   for path in args.inputs:
     if not path.endswith('.size'):
       parser.error('All inputs must end with ".size"')
 
   size_infos = [archive.LoadAndPostProcessSizeInfo(p) for p in args.inputs]
-  lazy_paths = paths.LazyPaths(args=args, input_file=args.inputs[0])
+  lazy_paths = paths.LazyPaths(tool_prefix=args.tool_prefix,
+                               output_directory=args.output_directory,
+                               any_path_within_output_directory=args.inputs[0])
   session = _Session(size_infos, lazy_paths)
 
   if args.query:
     logging.info('Running query from command-line.')
     session.Eval(args.query)
   else:
     logging.info('Entering interactive console.')
     session.GoInteractive()