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#!/usr/bin/env python3
import os
import sys
from pathlib import Path
def register_readline():
import atexit
try:
import readline
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 = ""
if "XDG_CACHE_HOME" in os.environ:
history = Path(os.environ["XDG_CACHE_HOME"]) / "python" / "history"
history.parent.mkdir(parents=True, exist_ok=True)
else:
history = os.path.join(os.path.expanduser('~'),
'.python_history')
try:
readline.read_history_file(history)
except OSError:
pass
def write_history():
try:
readline.write_history_file(history)
except OSError:
# bpo-19891, bpo-41193: Home directory does not exist
# or is not writable, or the filesystem is read-only.
pass
atexit.register(write_history)
sys.__interactivehook__ = register_readline
sys.ps1 = "> "
sys.ps2 = ". "
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