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from __future__ import annotations import os from os.path import exists from os.path import join from os.path import splitext from subprocess import check_call from typing import Dict from typing import List from typing import Mapping from typing import Optional from .compat import is_posix from .exc import CommandError def open_in_editor( filename: str, environ: Optional[Dict[str, str]] = None ) -> None: """ Opens the given file in a text editor. If the environment variable ``EDITOR`` is set, this is taken as preference. Otherwise, a list of commonly installed editors is tried. If no editor matches, an :py:exc:`OSError` is raised. :param filename: The filename to open. Will be passed verbatim to the editor command. :param environ: An optional drop-in replacement for ``os.environ``. Used mainly for testing. """ env = os.environ if environ is None else environ try: editor = _find_editor(env) check_call([editor, filename]) except Exception as exc: raise CommandError("Error executing editor (%s)" % (exc,)) from exc def _find_editor(environ: Mapping[str, str]) -> str: candidates = _default_editors() for i, var in enumerate(("EDITOR", "VISUAL")): if var in environ: user_choice = environ[var] if exists(user_choice): return user_choice if os.sep not in user_choice: candidates.insert(i, user_choice) for candidate in candidates: path = _find_executable(candidate, environ) if path is not None: return path raise OSError( "No suitable editor found. Please set the " '"EDITOR" or "VISUAL" environment variables' ) def _find_executable( candidate: str, environ: Mapping[str, str] ) -> Optional[str]: # Assuming this is on the PATH, we need to determine it's absolute # location. Otherwise, ``check_call`` will fail if not is_posix and splitext(candidate)[1] != ".exe": candidate += ".exe" for path in environ.get("PATH", "").split(os.pathsep): value = join(path, candidate) if exists(value): return value return None def _default_editors() -> List[str]: # Look for an editor. Prefer the user's choice by env-var, fall back to # most commonly installed editor (nano/vim) if is_posix: return ["sensible-editor", "editor", "nano", "vim", "code"] else: return ["code.exe", "notepad++.exe", "notepad.exe"]
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