69 lines
2.5 KiB
Python
69 lines
2.5 KiB
Python
# Improve interactive prompts by configuring readline. This is done by
|
|
# registering a custom hook as sys.__interactivehook__.
|
|
#
|
|
# If the readline module can be imported, the hook will:
|
|
# 1. Set the Tab key as completion key.
|
|
# 2. Initialize readline (e.g. from .inputrc).
|
|
# 3. Register a history file, using:
|
|
# - $XDG_DATA_HOME/python/history if XDG_DATA_HOME iset
|
|
# - .python_history otherwise.
|
|
def configure_readline():
|
|
import atexit
|
|
import os
|
|
|
|
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')
|
|
if 'XDG_DATA_HOME' in os.environ:
|
|
history = os.path.join(os.environ['XDG_DATA_HOME'], 'python', 'history')
|
|
|
|
try:
|
|
readline.read_history_file(history)
|
|
except OSError:
|
|
pass
|
|
|
|
def write_history():
|
|
try:
|
|
history_dir = os.path.dirname(history)
|
|
if not os.path.isdir(history_dir):
|
|
os.makedirs(history_dir)
|
|
|
|
readline.write_history_file(history)
|
|
except (FileNotFoundError, PermissionError, OSError):
|
|
# history file does not exist or is not writable
|
|
# https://bugs.python.org/issue19891
|
|
pass
|
|
|
|
atexit.register(write_history)
|
|
|
|
import sys
|
|
sys.__interactivehook__ = configure_readline
|
|
del sys, configure_readline # we don't want any of this in globals()
|