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from __future__ import annotations
from prompt_toolkit.completion.filesystem import ExecutableCompleter, PathCompleter
from prompt_toolkit.contrib.regular_languages.compiler import compile
from prompt_toolkit.contrib.regular_languages.completion import GrammarCompleter
__all__ = [
"SystemCompleter",
]
class SystemCompleter(GrammarCompleter):
"""
Completer for system commands.
"""
def __init__(self) -> None:
# Compile grammar.
g = compile(
r"""
# First we have an executable.
(?P<executable>[^\s]+)
# Ignore literals in between.
(
\s+
("[^"]*" | '[^']*' | [^'"]+ )
)*
\s+
# Filename as parameters.
(
(?P<filename>[^\s]+) |
"(?P<double_quoted_filename>[^\s]+)" |
'(?P<single_quoted_filename>[^\s]+)'
)
""",
escape_funcs={
"double_quoted_filename": (lambda string: string.replace('"', '\\"')),
"single_quoted_filename": (lambda string: string.replace("'", "\\'")),
},
unescape_funcs={
"double_quoted_filename": (
lambda string: string.replace('\\"', '"')
), # XXX: not entirely correct.
"single_quoted_filename": (lambda string: string.replace("\\'", "'")),
},
)
# Create GrammarCompleter
super().__init__(
g,
{
"executable": ExecutableCompleter(),
"filename": PathCompleter(only_directories=False, expanduser=True),
"double_quoted_filename": PathCompleter(
only_directories=False, expanduser=True
),
"single_quoted_filename": PathCompleter(
only_directories=False, expanduser=True
),
},
)
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