init: move editor from spack/__init__.py to spack.util.editor

lib/spack/spack/__init__.py

@@ -207,25 +207,6 @@
 from spack.util.executable import *
 __all__ += spack.util.executable.__all__
 
-
-# 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
-
 from spack.package import \
     install_dependency_symlinks, flatten_dependencies, \
     DependencyConflictError, InstallError, ExternalPackageError

lib/spack/spack/cmd/edit.py

@@ -31,6 +31,7 @@
 import spack.paths
 from spack.spec import Spec
 from spack.repository import Repo
+from spack.util.editor import editor
 
 description = "open package files in $EDITOR"
 section = "packaging"
@@ -64,7 +65,7 @@ def edit_package(name, repo_path, namespace):
         tty.die("No package for '{0}' was found.".format(spec.name),
                 "  Use `spack create` to create a new package")
 
-    spack.editor(path)
+    editor(path)
 
 
 def setup_parser(subparser):
@@ -137,9 +138,9 @@ def edit(parser, args):
                                                                         path))
                 path = files[0]  # already confirmed only one entry in files
 
-        spack.editor(path)
+        editor(path)
     elif name:
         edit_package(name, args.repo, args.namespace)
     else:
         # By default open the directory where packages live
-        spack.editor(path)
+        editor(path)

lib/spack/spack/util/editor.py

@@ -0,0 +1,54 @@
+##############################################################################
+# Copyright (c) 2013-2018, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://github.com/spack/spack
+# Please also see the NOTICE and LICENSE files for our notice and the LGPL.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License (as
+# published by the Free Software Foundation) version 2.1, February 1999.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
+# conditions of the GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+"""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