[vitali87]

Summary

split 1006 could silently split the wrong thing: the argument-form decision consulted branch_exists() (git rev-parse --verify) before _is_fork_ref(), and rev-parse happily resolves 1006 as an abbreviated commit SHA if any commit hash starts with those digits. The run then proceeded with "Extracting diff between main and 1006" against an arbitrary commit instead of fetching PR #1006 — reproduced against a real repo during review.

_is_fork_ref now wins unconditionally: a bare number (with or without #) is always a PR number. The precedence is documented in the argument help and README, including the escape hatch for a local branch literally named like a number — pass its full ref (refs/heads/1006), which flows through branch_exists/rev-parse and the whole pipeline (verified end to end, including the derived sub-branch namespace).

Stacked on #136 (stack = #111→#136→this).

Test plan

• test_pr_number_is_never_taken_for_an_abbreviated_sha — fails on the base (_resolve_fork_ref never called there)
• test_full_ref_is_not_a_fork_ref and test_full_ref_escape_hatch_takes_the_branch_path pin the documented escape hatch
• Review reproduced the original bug on a real repo (brute-forced a commit whose hash starts with 1006) and verified the escape hatch on real git
• 452 tests pass, ruff clean
• Local review: 5/5

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📥 Commits

Reviewing files that changed from the base of the PR and between e8a1c7b and 568ccea.

📒 Files selected for processing (3)

• README.md
• pr_split/cli.py
• tests/test_cli_coverage.py

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[vitali87]

This change is already in main: it landed via the merge train #243, which includes this PR's head commit. GitHub can't mark a stacked PR merged when it lands that way, so I'm closing it as done.

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