git-status: create config for ahead/behind calculation

The git status builtin includes a calculation for how far the local ref is ahead or behind the remote tracking branch. This check can be expensive, so we already have a --[no-]ahead-behind command-line option.

This series adds two bits of functionality to the feature:

1. Add a new status.aheadBehind config setting.

2. Add a new advice.statusAheadBehind config setting associated with a warning that suggests status.aheadBehind when the calculation takes a long time.

We have been running with these commits in microsoft/git for a while now. The only change I made in adapting Jeff's commits was to add the advice config documentation.

The status.aheadBehind config setting is a candidate to be added to the proposed "large repo" meta-config setting previously discussed [1]. I'm putting this out for independent review as it is much smaller compared to the potential of that series.

Thanks, -Stolee

[1] https://public-inbox.org/git/[email protected]/

Jeff Hostetler (3):
status: add status.aheadbehind setting
status: warn when a/b calculation takes too long
status: ignore status.aheadbehind in porcelain formats

 Documentation/config/advice.txt |  6 ++++++
 Documentation/config/status.txt |  5 +++++
 advice.c                        |  2 ++
 advice.h                        |  1 +
 builtin/commit.c                | 19 ++++++++++++++++++-
 t/t6040-tracking-info.sh        | 31 +++++++++++++++++++++++++++++++
 t/t7064-wtstatus-pv2.sh         |  8 ++++++++
 wt-status.c                     | 17 +++++++++++++++++
 8 files changed, 88 insertions(+), 1 deletion(-)

base-commit: b697d92f56511e804b8ba20ccbe7bdc85dc66810
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-272%2Fderrickstolee%2Fstatus-ahead-behind-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-272/derrickstolee/status-ahead-behind-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/272

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