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      file_contents = content_file.read()
  except IOError:
    if log_exception:
      Log('Unable to read '+filename)
    return ''
  return file_contents

# because reading is ~25x more expensive than getmtime, we will only read & parse if
# the getmtime is more recent than last call for this file. So this dict stores the
# a tuple, the last time read & the resulting parsed return value
CACHED_FILES = {}
def ReadAndParseSettings(filename):
  """Reads given filename and then parses the resulting key-value pairs into a dict."""
  global CACHED_FILES
  (last_read_time, settings) = CACHED_FILES.get(filename, (0, {}))
  if os.path.exists(filename):
    last_modified = os.path.getmtime(filename)
    if last_modified > last_read_time:
      setting_str = ReadFile(filename)
      settings = ParseSettings(setting_str)
      CACHED_FILES[filename] = (last_modified, settings)
    return settings

  # File does not - or at least no longer - exists; so remove the cache
  if filename in CACHED_FILES:
    CACHED_FILES.pop(filename)

  return {}


def BuildSettings(d):
  """Converts a dict to a string of form key1=value1;...;keyn=valuen; keys alpha sorted."""
  kv_pairs = []
  for key in sorted(list(d.keys())):
    kv_pairs.append('%s=%s' % (key, d[key]))
  s = ';'.join(kv_pairs)
  if s:  # add terminating semicolon
    s += ';'
  return s






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      file_contents = content_file.read()
  except IOError:
    if log_exception:
      Log('Unable to read '+filename)
    return ''
  return file_contents

# because reading is ~25x more expensive than getmtime, we will only read & parse if
# the getmtime is more recent than last call for this file. So this dict stores the
# a tuple, the last time read & the resulting parsed return value
CACHED_FILES = {}
def ReadAndParseSettings(filename):
  """Reads given filename and then parses the resulting key-value pairs into a dict."""
  global CACHED_FILES
  (last_read_time, settings) = CACHED_FILES.get(filename, (0, {}))
  if os.path.exists(filename):
    last_modified = os.path.getmtime(filename)
    if last_modified > last_read_time:
      setting_str = ReadFile(filename)
      settings = ParseSettings(setting_str)
      #CACHED_FILES[filename] = (last_modified, settings)  # TODO - uncomment?
    return settings

  # File does not - or at least no longer - exists; so remove the cache
  if filename in CACHED_FILES:
    CACHED_FILES.pop(filename)

  return {}


def BuildSettings(d):
  """Converts a dict to a string of form key1=value1;...;keyn=valuen; keys alpha sorted."""
  kv_pairs = []
  for key in sorted(list(d.keys())):
    kv_pairs.append('%s=%s' % (key, d[key]))
  s = ';'.join(kv_pairs)
  if s:  # add terminating semicolon
    s += ';'
  return s






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