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# Copyright 2013-2018 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)
"""Module for finding the user's preferred text editor.
Defines one variable: ``editor``, which is a
``spack.util.executable.Executable`` object that can be called to invoke
the editor.
If no ``editor`` is found, an ``EnvironmentError`` is raised when
``editor`` is invoked.
"""
import os
from spack.util.executable import Executable, which
# Set up the user's editor
# $EDITOR environment variable has the highest precedence
editor = os.environ.get('EDITOR')
# if editor is not set, use some sensible defaults
if editor is not None:
editor = Executable(editor)
else:
editor = which('vim', 'vi', 'emacs', 'nano')
# If there is no editor, only raise an error if we actually try to use it.
if not editor:
def editor_not_found(*args, **kwargs):
raise EnvironmentError(
'No text editor found! Please set the EDITOR environment variable '
'to your preferred text editor.')
editor = editor_not_found
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