Function get_diff_against_branch

src/utils/git.py:218–248

(
    branch: str,
    cwd: str | None = None,
)

def get_diff_against_branch(
    branch: str,
    cwd: str | None = None,
) -> DiffResult:
    diff_output = _run_git_ok(["diff", f"{branch}...HEAD"], cwd)
    stat_output = _run_git_ok(["diff", "--stat", f"{branch}...HEAD"], cwd)

    files_changed = 0
    insertions = 0
    deletions = 0
    if stat_output:
        lines = stat_output.strip().splitlines()
        if lines:
            import re
            summary = lines[-1]
            files_match = re.search(r"(\d+)\s+file", summary)
            ins_match = re.search(r"(\d+)\s+insertion", summary)
            del_match = re.search(r"(\d+)\s+deletion", summary)
            if files_match:
                files_changed = int(files_match.group(1))
            if ins_match:
                insertions = int(ins_match.group(1))
            if del_match:
                deletions = int(del_match.group(1))

    return DiffResult(
        diff_text=diff_output,
        files_changed=files_changed,
        insertions=insertions,
        deletions=deletions,
    )


def create_branch(