[vitali87]

Problem

scripts/score_pr.py turned the PR's base and head into local branches named after them:

git branch -f <base> origin/<base>
git branch -f <head> pr-split/head-<n>

A fork PR opened from the fork's own main (very common) has HEAD_BRANCH == BASE_BRANCH == main, so the second command re-pointed main at the PR head. git diff main...main is empty, pr-split split produced a 0-group plan, and the PR was reported as within limits. Verified in a scratch clone with a real refs/pull/7/head: the old script left main == pr-split/head-7 != origin/main.

Fix

Don't materialise branches at all. Pass origin/<base> and the fetched head ref (pr-split/head-<n>, or origin/<head> when there is no PR number) straight to pr-split split; branch_exists uses rev-parse --verify, and extract_diff/merge_base accept any ref (verified end to end: 6 groups on a 240-LOC PR).

Tests

• head named like base: no git branch calls, split invoked with pr-split/head-7 --base origin/main
• branch event without PR number: origin/feature --base origin/main

Both fail on base. Local review: 5/5. 446 tests pass, ruff clean.

Note: the action still reports 0 groups until #53 (plan-file key) merges; the two fixes are independent.

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Review configuration:

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: ada2fc37-8625-41c1-b009-2c8bd4bbe978

📥 Commits

Reviewing files that changed from the base of the PR and between 671a081 and fc5b24d.

📒 Files selected for processing (2)

• scripts/score_pr.py
• tests/test_score_pr_refs.py

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