mirror of
https://gerrit.googlesource.com/git-repo
synced 2024-12-21 07:16:21 +00:00
07a4529278
This matches the git behavior. From [1],
> When the `LESS` environment variable is unset, Git sets it to `FRX`
> (if `LESS` environment variable is set, Git does not change it at
> all).
The default $LESS is changed from FRSX to FRX since git 2.1.0 [2]. This
change also updates the default $LESS for repo.
[1] https://git-scm.com/docs/git-config#Documentation/git-config.txt-corepager
[2] b3275838d9
Bug: https://crbug.com/gerrit/16973
Change-Id: I64ccaa7b034fdb6a92c10025e47f5d07e85e6451
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/374894
Reviewed-by: Chih-Hsuan Yen <x5f4qvj3w3ge2tiq@chyen.cc>
Reviewed-by: Mike Frysinger <vapier@google.com>
Tested-by: Chih-Hsuan Yen <x5f4qvj3w3ge2tiq@chyen.cc>
130 lines
3.5 KiB
Python
130 lines
3.5 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 subprocess
|
|
import sys
|
|
|
|
import platform_utils
|
|
|
|
active = False
|
|
pager_process = None
|
|
old_stdout = None
|
|
old_stderr = None
|
|
|
|
|
|
def RunPager(globalConfig):
|
|
if not os.isatty(0) or not os.isatty(1):
|
|
return
|
|
pager = _SelectPager(globalConfig)
|
|
if pager == "" or pager == "cat":
|
|
return
|
|
|
|
if platform_utils.isWindows():
|
|
_PipePager(pager)
|
|
else:
|
|
_ForkPager(pager)
|
|
|
|
|
|
def TerminatePager():
|
|
global pager_process, old_stdout, old_stderr
|
|
if pager_process:
|
|
sys.stdout.flush()
|
|
sys.stderr.flush()
|
|
pager_process.stdin.close()
|
|
pager_process.wait()
|
|
pager_process = None
|
|
# Restore initial stdout/err in case there is more output in this
|
|
# process after shutting down the pager process.
|
|
sys.stdout = old_stdout
|
|
sys.stderr = old_stderr
|
|
|
|
|
|
def _PipePager(pager):
|
|
global pager_process, old_stdout, old_stderr
|
|
assert pager_process is None, "Only one active pager process at a time"
|
|
# Create pager process, piping stdout/err into its stdin.
|
|
try:
|
|
pager_process = subprocess.Popen(
|
|
[pager], stdin=subprocess.PIPE, stdout=sys.stdout, stderr=sys.stderr
|
|
)
|
|
except FileNotFoundError:
|
|
sys.exit(f'fatal: cannot start pager "{pager}"')
|
|
old_stdout = sys.stdout
|
|
old_stderr = sys.stderr
|
|
sys.stdout = pager_process.stdin
|
|
sys.stderr = pager_process.stdin
|
|
|
|
|
|
def _ForkPager(pager):
|
|
global active
|
|
# 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("fatal: cannot start pager '%s'" % pager, file=sys.stderr)
|
|
sys.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])
|
|
|
|
# This matches the behavior of git, which sets $LESS to `FRX` if it is not
|
|
# set. See:
|
|
# https://git-scm.com/docs/git-config#Documentation/git-config.txt-corepager
|
|
os.environ.setdefault("LESS", "FRX")
|
|
|
|
try:
|
|
os.execvp(pager, [pager])
|
|
except OSError:
|
|
os.execv("/bin/sh", ["sh", "-c", pager])
|