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import os
from typing import Callable, Iterable, List, Optional
from prompt_toolkit.completion import CompleteEvent, Completer, Completion
from prompt_toolkit.document import Document
__all__ = [
"PathCompleter",
"ExecutableCompleter",
]
class PathCompleter(Completer):
"""
Complete for Path variables.
:param get_paths: Callable which returns a list of directories to look into
when the user enters a relative path.
:param file_filter: Callable which takes a filename and returns whether
this file should show up in the completion. ``None``
when no filtering has to be done.
:param min_input_len: Don't do autocompletion when the input string is shorter.
"""
def __init__(
self,
only_directories: bool = False,
get_paths: Optional[Callable[[], List[str]]] = None,
file_filter: Optional[Callable[[str], bool]] = None,
min_input_len: int = 0,
expanduser: bool = False,
) -> None:
self.only_directories = only_directories
self.get_paths = get_paths or (lambda: ["."])
self.file_filter = file_filter or (lambda _: True)
self.min_input_len = min_input_len
self.expanduser = expanduser
def get_completions(
self, document: Document, complete_event: CompleteEvent
) -> Iterable[Completion]:
text = document.text_before_cursor
# Complete only when we have at least the minimal input length,
# otherwise, we can too many results and autocompletion will become too
# heavy.
if len(text) < self.min_input_len:
return
try:
# Do tilde expansion.
if self.expanduser:
text = os.path.expanduser(text)
# Directories where to look.
dirname = os.path.dirname(text)
if dirname:
directories = [
os.path.dirname(os.path.join(p, text)) for p in self.get_paths()
]
else:
directories = self.get_paths()
# Start of current file.
prefix = os.path.basename(text)
# Get all filenames.
filenames = []
for directory in directories:
# Look for matches in this directory.
if os.path.isdir(directory):
for filename in os.listdir(directory):
if filename.startswith(prefix):
filenames.append((directory, filename))
# Sort
filenames = sorted(filenames, key=lambda k: k[1])
# Yield them.
for directory, filename in filenames:
completion = filename[len(prefix) :]
full_name = os.path.join(directory, filename)
if os.path.isdir(full_name):
# For directories, add a slash to the filename.
# (We don't add them to the `completion`. Users can type it
# to trigger the autocompletion themselves.)
filename += "/"
elif self.only_directories:
continue
if not self.file_filter(full_name):
continue
yield Completion(
text=completion,
start_position=0,
display=filename,
)
except OSError:
pass
class ExecutableCompleter(PathCompleter):
"""
Complete only executable files in the current path.
"""
def __init__(self) -> None:
super().__init__(
only_directories=False,
min_input_len=1,
get_paths=lambda: os.environ.get("PATH", "").split(os.pathsep),
file_filter=lambda name: os.access(name, os.X_OK),
expanduser=True,
),
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