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#
# 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 re
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
if cls.globalConfig:
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()
if editor == ':':
return data
fd, path = tempfile.mkstemp()
try:
os.write(fd, data)
os.close(fd)
fd = None
if re.compile("^.*[$ \t'].*$").match(editor):
args = [editor + ' "$@"', 'sh']
shell = True
else:
args = [editor]
shell = False
args.append(path)
try:
rc = subprocess.Popen(args, shell=shell).wait()
except OSError, e:
raise EditorError('editor failed, %s: %s %s'
% (str(e), editor, path))
if rc != 0:
raise EditorError('editor failed with exit status %d: %s %s'
% (rc, editor, path))
fd2 = open(path)
try:
return fd2.read()
finally:
fd2.close()
finally:
if fd:
os.close(fd)
os.remove(path)
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