Initial Contribution
diff --git a/editor.py b/editor.py
new file mode 100644
index 0000000..4f22257
--- /dev/null
+++ b/editor.py
@@ -0,0 +1,85 @@
+#
+# Copyright (C) 2008 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import os
+import sys
+import subprocess
+import tempfile
+
+from error import EditorError
+
+class Editor(object):
+ """Manages the user's preferred text editor."""
+
+ _editor = None
+ globalConfig = None
+
+ @classmethod
+ def _GetEditor(cls):
+ if cls._editor is None:
+ cls._editor = cls._SelectEditor()
+ return cls._editor
+
+ @classmethod
+ def _SelectEditor(cls):
+ e = os.getenv('GIT_EDITOR')
+ if e:
+ return e
+
+ e = cls.globalConfig.GetString('core.editor')
+ if e:
+ return e
+
+ e = os.getenv('VISUAL')
+ if e:
+ return e
+
+ e = os.getenv('EDITOR')
+ if e:
+ return e
+
+ if os.getenv('TERM') == 'dumb':
+ print >>sys.stderr,\
+"""No editor specified in GIT_EDITOR, core.editor, VISUAL or EDITOR.
+Tried to fall back to vi but terminal is dumb. Please configure at
+least one of these before using this command."""
+ sys.exit(1)
+
+ return 'vi'
+
+ @classmethod
+ def EditString(cls, data):
+ """Opens an editor to edit the given content.
+
+ Args:
+ data : the text to edit
+
+ Returns:
+ new value of edited text; None if editing did not succeed
+ """
+ editor = cls._GetEditor()
+ fd, path = tempfile.mkstemp()
+ try:
+ os.write(fd, data)
+ os.close(fd)
+ fd = None
+
+ if subprocess.Popen([editor, path]).wait() != 0:
+ raise EditorError()
+ return open(path).read()
+ finally:
+ if fd:
+ os.close(fd)
+ os.remove(path)