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pager: set $LESS only when missing

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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>
This commit is contained in:
Chih-Hsuan Yen 2023-05-24 22:32:23 +08:00
parent 17833322d9
commit 07a4529278
1 changed files with 4 additions and 1 deletions
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5
pager.py
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@ -118,7 +118,10 @@ def _BecomePager(pager):
# available versions of 'less', a better 'more'.
_a, _b, _c = select.select([0], [], [0])
os.environ["LESS"] = "FRSX"
# 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])