Purpose

Remove the redundant default_bump_level configuration option from conventional-commit, scipy, and emoji parsers. The option duplicates functionality already provided by explicit commit type to bump level mappings.

Rationale

Each parser's tag_to_level mapping already defines bump levels for all recognized commit types. The default_bump_level was only used as a fallback in zip_longest operations during map construction—a confusing indirection that obscured actual behavior. Removing it eliminates configuration complexity without changing semantics: unrecognized commit types now explicitly receive LevelBump.NO_RELEASE instead of a configurable default.

Before:

# scipy.py
default_level_bump: LevelBump = LevelBump.NO_RELEASE
# ...
*zip_longest(self.allowed_tags, (), fillvalue=self.default_bump_level)

After:

# scipy.py - no field, direct constant
*zip_longest(self.allowed_tags, (), fillvalue=LevelBump.NO_RELEASE)

How did you test?

• Updated existing test that relied on default_bump_level to verify NO_RELEASE behavior
• Added unit tests confirming parsers handle commits with other_allowed_tags correctly
• Verified 4238 unit tests pass

How to Verify

Run the test suite:

pytest -m unit

Check that parsers correctly assign NO_RELEASE to unmatched commit types without configuration errors.

PR Completion Checklist

• Reviewed & followed the Contributor Guidelines

• Changes Implemented & Validation pipeline succeeds

• Commits follow the Conventional Commits standard
  and are separated into the proper commit type and scope (recommended order: test, build, feat/fix, docs)

• Appropriate Unit tests added/updated

• Appropriate End-to-End tests added/updated

• Appropriate Documentation added/updated and syntax validated for sphinx build (see Contributor Guidelines)

BREAKING CHANGE: The default_bump_level option has been removed from conventional-commit, scipy, and emoji parser configurations. Remove this option from your pyproject.toml if present. Behavior unchanged: unrecognized commit types receive NO_RELEASE.

Closes #1293, #700

This pull request was created as a result of the following prompt from Copilot chat.

Remove the commit_parser_options.default_bump_level setting from the three commit parsers in the python-semantic-release repository: conventional-commit, scipy, and emoji. Create a single PR targeting branch 'master' that implements the following changes.

Scope of work (detailed and actionable):

1. Search & Locate

• Find all occurrences of the strings default_bump_level and commit_parser_options.default_bump_level across the repository and list the files touched.
• Identify the three parser implementations (conventional-commit, scipy, emoji), their default option construction, registrations, and any docs or config schema referencing the option.

2. Code changes

• Remove any explicit default_bump_level keys from parser default option dicts, dataclasses, or pydantic models for the three parsers.
• If any code expects the key to exist (direct dict access or attribute access), change the access to use .get("default_bump_level") or optional attribute access and treat missing value as None. Ensure no behavioral change beyond removing the explicit default.
• Ensure bump resolution logic falls back to existing mechanisms (explicit mappings, commit type/emoji mapping, etc.). Do not introduce new bump-resolution logic.
• Update any parser factories or entry-point registration that provide this option.

3. Tests

• Run unit tests and e2e tests locally via the repository's recommended commands (use ruff, mypy, pytest -m unit, pytest -m e2e where appropriate) to find failing tests.
• Update tests that reference default_bump_level so they no longer rely on it; instead assert that parsers operate correctly when the option is absent.
• Add a small unit test per parser to assert parser behavior when commit_parser_options does not include default_bump_level (parser doesn't crash and bump decisions are as expected based on existing mapping rules).

4. Docs & Schema

• Update configuration schema (pydantic models or JSON schema) and user docs to remove default_bump_level references for the three parsers.
• Update any examples in docs showing usage of default_bump_level.

5. Lint & Type checks

• Run ruff format and ruff check --unsafe-fixes, mypy . and fix any type/lint errors introduced.

6. Commits & PR

• Create branch: brk/remove-default-bump-level-from-parsers (branch should be created from master as requested). If 'brk/' prefix conflicts with repo conventions, still use it exactly as requested.
• Commit changes in logical units (one commit per parser removal + tests + docs) with conventional commit messages and mark as breaking change where appropriate.
• Final commit message for the PR: "refactor(parsers)!: remove default_bump_level from commit parsers"
• The PR body should include:
  • Summary of change and motivation
  • Files changed
  • Test updates and results
  • Note that this is a breaking change and should close issues bug: default_level_bump no longer working as expected #1293 and Default level bump in >=8.0.0 ? #700
  • Local test/format commands run and their results
• Open a single pull request against the master branch.

Constraints and safety notes:

• Only touch the three parsers: conventional-commit, scipy, emoji. If default_bump_level is referenced elsewhere, do not remove it there; instead, report locations in PR and ask for guidance.
• Preserve all other behavior; do not change default bump resolution semantics beyond removing this explicit config option.
• Keep code style consistent with project (ruff, mypy) and tests passing.

Deliverables (what to include in the PR):

• Code changes removing default_bump_level for the three parsers
• Updated and new tests
• Updated docs/schema
• PR description closing bug: default_level_bump no longer working as expected #1293 and Default level bump in >=8.0.0 ? #700

Local commands the agent will run as part of the work (examples):

• git checkout -b brk/remove-default-bump-level-from-parsers master
• git grep -n "default_bump_level" || true
• apply code changes
• ruff format .
• ruff check --unsafe-fixes .
• mypy .
• pytest -m unit
• pytest -m e2e

Repository: python-semantic-release/python-semantic-release
Target branch (base_ref): master

Note: This is an engineering change that will produce a pull request with code, tests and docs updates. Follow repository contribution rules and run the suggested local checks to ensure the PR is clean.

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