mirror of
https://gerrit.googlesource.com/git-repo
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85 lines
1.9 KiB
Python
85 lines
1.9 KiB
Python
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#
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# Copyright (C) 2008 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import select
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import sys
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active = False
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def RunPager(globalConfig):
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global active
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if not os.isatty(0):
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return
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pager = _SelectPager(globalConfig)
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if pager == '' or pager == 'cat':
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return
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# This process turns into the pager; a child it forks will
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# do the real processing and output back to the pager. This
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# is necessary to keep the pager in control of the tty.
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#
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try:
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r, w = os.pipe()
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pid = os.fork()
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if not pid:
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os.dup2(w, 1)
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os.dup2(w, 2)
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os.close(r)
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os.close(w)
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active = True
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return
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os.dup2(r, 0)
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os.close(r)
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os.close(w)
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_BecomePager(pager)
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except Exception:
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print >>sys.stderr, "fatal: cannot start pager '%s'" % pager
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os.exit(255)
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def _SelectPager(globalConfig):
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try:
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return os.environ['GIT_PAGER']
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except KeyError:
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pass
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pager = globalConfig.GetString('core.pager')
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if pager:
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return pager
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try:
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return os.environ['PAGER']
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except KeyError:
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pass
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return 'less'
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def _BecomePager(pager):
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# Delaying execution of the pager until we have output
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# ready works around a long-standing bug in popularly
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# available versions of 'less', a better 'more'.
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#
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a, b, c = select.select([0], [], [0])
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os.environ['LESS'] = 'FRSX'
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try:
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os.execvp(pager, [pager])
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except OSError, e:
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os.execv('/bin/sh', ['sh', '-c', pager])
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