def enablerlcompleter():
"""Enable default readline configuration on interactive prompts, by
registering a sys.__interactivehook__.
If the readline module can be imported, the hook will set the Tab key
as completion key and register ~/.python_history as history file.
This can be overriden in the sitecustomize or usercustomize module,
or in a PYTHONSTARTUP file.
"""
def register_readline():
import atexit
try:
import readline
import rlcompleter
except ImportError:
return
# Reading the initialization (config) file may not be enough to set a
# completion key, so we set one first and then read the file.
readline_doc = getattr(readline, '__doc__', '')
if readline_doc is not None and 'libedit' in readline_doc:
readline.parse_and_bind('bind ^I rl_complete')
else:
readline.parse_and_bind('tab: complete')
try:
readline.read_init_file()
except OSError:
# An OSError here could have many causes, but the most likely one
# is that there's no .inputrc file (or .editrc file in the case of
# Mac OS X + libedit) in the expected location. In that case, we
# want to ignore the exception.
pass
if readline.get_current_history_length() == 0:
# If no history was loaded, default to .python_history.
# The guard is necessary to avoid doubling history size at
# each interpreter exit when readline was already configured
# through a PYTHONSTARTUP hook, see:
# http://bugs.python.org/issue5845#msg198636
history = os.path.join(os.path.expanduser('~'),
'.python_history')
try:
readline.read_history_file(history)
except IOError:
pass
atexit.register(readline.write_history_file, history)
sys.__interactivehook__ = register_readline
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