[vitali87]

Summary

A custom .pr-split/template.md was first rendered inside _create_single_pr — i.e. after every branch had been created and pushed — so a typo in the template surfaced only at PR-creation time, wrapped in PRCreationError. Attribute and index placeholders ({title.nope}, {added[0]}) additionally escaped the friendly "Invalid PR template … Available placeholders …" handler because str.format raises AttributeError/TypeError for them.

Now _render_pr_template catches all five error classes, and a new validate_pr_template() renders the template against sample values in _validate_inputs (skipped on --dry-run, which never opens PRs) and at the start of execute, so a bad template exits 1 with the friendly message before any branch exists — including before the re-split cleanup.

Stacked on #150 (fix/pr-body-length-cap), which touches the same function.

Test plan

• TestPrTemplateEarlyValidation: five bad placeholder shapes are friendly errors from both the validator and the real render; a valid template with format specs and escaped braces renders; _validate_inputs rejects a bad template (and skips it on dry run); execute rejects it before the confirm prompt — all fail on the base
• Review compared sample-value vs real rendering across 23 templates (format specs, conversions, attribute/index access): no mismatches
• 457 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 6126b95 and c4600b0.

📒 Files selected for processing (2)

• 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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