mirror of
https://gerrit.googlesource.com/git-repo
synced 2024-12-23 07:16:21 +00:00
85 lines
1.9 KiB
Python
85 lines
1.9 KiB
Python
|
#
|
||
|
|
# 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 select
|
||
|
|
import sys
|
||
|
|
|
||
|
|
active = False
|
||
|
|
|
||
|
|
def RunPager(globalConfig):
|
||
|
|
global active
|
||
|
|
|
||
|
|
if not os.isatty(0):
|
||
|
|
return
|
||
|
|
pager = _SelectPager(globalConfig)
|
||
|
|
if pager == '' or pager == 'cat':
|
||
|
|
return
|
||
|
|
|
||
|
|
# This process turns into the pager; a child it forks will
|
||
|
|
# do the real processing and output back to the pager. This
|
||
|
|
# is necessary to keep the pager in control of the tty.
|
||
|
|
#
|
||
|
|
try:
|
||
|
|
r, w = os.pipe()
|
||
|
|
pid = os.fork()
|
||
|
|
if not pid:
|
||
|
|
os.dup2(w, 1)
|
||
|
|
os.dup2(w, 2)
|
||
|
|
os.close(r)
|
||
|
|
os.close(w)
|
||
|
|
active = True
|
||
|
|
return
|
||
|
|
|
||
|
|
os.dup2(r, 0)
|
||
|
|
os.close(r)
|
||
|
|
os.close(w)
|
||
|
|
|
||
|
|
_BecomePager(pager)
|
||
|
|
except Exception:
|
||
|
|
print >>sys.stderr, "fatal: cannot start pager '%s'" % pager
|
||
|
|
os.exit(255)
|
||
|
|
|
||
|
|
def _SelectPager(globalConfig):
|
||
|
|
try:
|
||
|
|
return os.environ['GIT_PAGER']
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
pager = globalConfig.GetString('core.pager')
|
||
|
|
if pager:
|
||
|
|
return pager
|
||
|
|
|
||
|
|
try:
|
||
|
|
return os.environ['PAGER']
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
return 'less'
|
||
|
|
|
||
|
|
def _BecomePager(pager):
|
||
|
|
# Delaying execution of the pager until we have output
|
||
|
|
# ready works around a long-standing bug in popularly
|
||
|
|
# available versions of 'less', a better 'more'.
|
||
|
|
#
|
||
|
|
a, b, c = select.select([0], [], [0])
|
||
|
|
|
||
|
|
os.environ['LESS'] = 'FRSX'
|
||
|
|
|
||
|
|
try:
|
||
|
|
os.execvp(pager, [pager])
|
||
|
|
except OSError, e:
|
||
|
|
os.execv('/bin/sh', ['sh', '-c', pager])
|