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