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"""
SoftLayer.CLI.shell.completer
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Click completer for prompt_toolkit
:license: MIT, see LICENSE for more details.
"""
import itertools
import shlex
import click
from prompt_toolkit import completion as completion
class ShellCompleter(completion.Completer):
"""Completer for the shell."""
def __init__(self, click_root):
self.root = click_root
def get_completions(self, document, complete_event):
"""Returns an iterator of completions for the shell."""
return _click_autocomplete(self.root, document.text_before_cursor)
def _click_autocomplete(root, text):
"""Completer generator for click applications."""
try:
parts = shlex.split(text)
except ValueError:
return
location, incomplete = _click_resolve_command(root, parts)
if not text.endswith(' ') and not incomplete and text:
return
if incomplete and not incomplete[0:2].isalnum():
for param in location.params:
if not isinstance(param, click.Option):
continue
for opt in itertools.chain(param.opts, param.secondary_opts):
if opt.startswith(incomplete):
yield completion.Completion(opt, -len(incomplete), display_meta=param.help)
elif isinstance(location, (click.MultiCommand, click.core.Group)):
ctx = click.Context(location)
commands = location.list_commands(ctx)
for command in commands:
if command.startswith(incomplete):
cmd = location.get_command(ctx, command)
yield completion.Completion(command, -len(incomplete), display_meta=cmd.short_help)
def _click_resolve_command(root, parts):
"""Return the click command and the left over text given some vargs."""
location = root
incomplete = ''
for part in parts:
incomplete = part
if not part[0:2].isalnum():
continue
try:
next_location = location.get_command(click.Context(location),
part)
if next_location is not None:
location = next_location
incomplete = ''
except AttributeError:
break
return location, incomplete
|
