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.venv2/Lib/site-packages/alembic/util/editor.py

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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"]