Add a new configuration variable `status.compareBranches` that allows
users to specify a space-separated list of branches to compare against
the current branch in `git status` output.
Each branch in the list can be:
- A remote-tracking branch name (e.g., `origin/main`)
- The special reference `@{upstream}` for the tracking branch
- The special reference `@{push}` for the push destination
When not configured, the default behavior is equivalent to setting
`status.compareBranches = @{upstream}`, preserving backward compatibility.
The advice messages shown are context-aware:
- "git pull" advice is shown only when comparing against @{upstream}
- "git push" advice is shown only when comparing against @{push}
- Divergence advice is shown for upstream branch comparisons
This is useful for triangular workflows where the upstream tracking
branch differs from the push destination, allowing users to see their
status relative to both branches at once.
Example configuration:
[status]
compareBranches = @{upstream} @{push}
Signed-off-by: Harald Nordgren <haraldnordgren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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