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"""allow bash-completion for argparse with argcomplete if installed
needs argcomplete>=0.5.6 for python 3.2/3.3 (older versions fail
to find the magic string, so _ARGCOMPLETE env. var is never set, and
this does not need special code.
Function try_argcomplete(parser) should be called directly before
the call to ArgumentParser.parse_args().
The filescompleter is what you normally would use on the positional
arguments specification, in order to get "dirname/" after "dirn<TAB>"
instead of the default "dirname ":
optparser.add_argument(Config._file_or_dir, nargs='*'
).completer=filescompleter
Other, application specific, completers should go in the file
doing the add_argument calls as they need to be specified as .completer
attributes as well. (If argcomplete is not installed, the function the
attribute points to will not be used).
SPEEDUP
=======
The generic argcomplete script for bash-completion
(/etc/bash_completion.d/python-argcomplete.sh )
uses a python program to determine startup script generated by pip.
You can speed up completion somewhat by changing this script to include
# PYTHON_ARGCOMPLETE_OK
so the the python-argcomplete-check-easy-install-script does not
need to be called to find the entry point of the code and see if that is
marked with PYTHON_ARGCOMPLETE_OK
INSTALL/DEBUGGING
=================
To include this support in another application that has setup.py generated
scripts:
- add the line:
# PYTHON_ARGCOMPLETE_OK
near the top of the main python entry point
- include in the file calling parse_args():
from _argcomplete import try_argcomplete, filescompleter
, call try_argcomplete just before parse_args(), and optionally add
filescompleter to the positional arguments' add_argument()
If things do not work right away:
- switch on argcomplete debugging with (also helpful when doing custom
completers):
export _ARC_DEBUG=1
- run:
python-argcomplete-check-easy-install-script $(which appname)
echo $?
will echo 0 if the magic line has been found, 1 if not
- sometimes it helps to find early on errors using:
_ARGCOMPLETE=1 _ARC_DEBUG=1 appname
which should throw a KeyError: 'COMPLINE' (which is properly set by the
global argcomplete script).
"""
import os
import sys
from glob import glob
from typing import Optional
class FastFilesCompleter:
"Fast file completer class"
def __init__(self, directories=True):
self.directories = directories
def __call__(self, prefix, **kwargs):
"""only called on non option completions"""
if os.path.sep in prefix[1:]:
prefix_dir = len(os.path.dirname(prefix) + os.path.sep)
else:
prefix_dir = 0
completion = []
globbed = []
if "*" not in prefix and "?" not in prefix:
# we are on unix, otherwise no bash
if not prefix or prefix[-1] == os.path.sep:
globbed.extend(glob(prefix + ".*"))
prefix += "*"
globbed.extend(glob(prefix))
for x in sorted(globbed):
if os.path.isdir(x):
x += "/"
# append stripping the prefix (like bash, not like compgen)
completion.append(x[prefix_dir:])
return completion
if os.environ.get("_ARGCOMPLETE"):
try:
import argcomplete.completers
except ImportError:
sys.exit(-1)
filescompleter = FastFilesCompleter() # type: Optional[FastFilesCompleter]
def try_argcomplete(parser):
argcomplete.autocomplete(parser, always_complete_options=False)
else:
def try_argcomplete(parser):
pass
filescompleter = None
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