# Auto-Detection Logic

Detect test runner, version file, and changelog format from project files.

## Test Runner Detection

Check in order (first match wins):

| Check | Test Command |
|-------|-------------|
| `package.json` → `scripts.test` exists | `npm test` |
| `Makefile` → has `test:` target | `make test` |
| `pytest.ini` OR `pyproject.toml` has `[tool.pytest]` | `pytest` |
| `Cargo.toml` exists | `cargo test` |
| `go.mod` exists | `go test ./...` |
| `Gemfile` + `Rakefile` with test task | `bundle exec rake test` |
| `build.gradle` or `build.gradle.kts` | `./gradlew test` |
| `pom.xml` | `mvn test` |
| `mix.exs` | `mix test` |
| `deno.json` | `deno test` |

**Detection script:**
```bash
if [ -f package.json ] && grep -q '"test"' package.json 2>/dev/null; then
  echo "npm test"
elif [ -f Makefile ] && grep -q '^test:' Makefile 2>/dev/null; then
  echo "make test"
elif [ -f pytest.ini ] || ([ -f pyproject.toml ] && grep -q '\[tool.pytest' pyproject.toml 2>/dev/null); then
  echo "pytest"
elif [ -f Cargo.toml ]; then
  echo "cargo test"
elif [ -f go.mod ]; then
  echo "go test ./..."
else
  echo "NONE"
fi
```

**If NONE:** Use `AskUserQuestion` — "No test runner detected. Options: A) Skip tests, B) Provide test command"

## Version File Detection

Check in order:

| Check | Read Pattern |
|-------|-------------|
| `VERSION` file | Read as semver string |
| `package.json` → `version` field | `jq -r .version package.json` |
| `pyproject.toml` → `version` | grep `version = "..."` |
| `Cargo.toml` → `version` | grep `version = "..."` |
| `mix.exs` → `@version` | grep `@version "..."` |

**If none found:** Skip version bump silently. Not all projects use versioning.

**Bump logic:**
```
Lines changed < 50  → patch (X.Y.Z → X.Y.Z+1)
Lines changed >= 50 → patch (safe default)
User explicitly says "breaking" or "major feature" → AskUserQuestion for minor/major
```

## Changelog Detection

| Check | Format |
|-------|--------|
| `CHANGELOG.md` | Keep-a-changelog format |
| `CHANGES.md` | Same |
| `HISTORY.md` | Same |

**If none found:** Skip changelog silently.

**Entry format:**
```markdown
## [X.Y.Z] - YYYY-MM-DD

### Added
- New features from commits with `feat:` prefix

### Changed
- Changes from commits with `refactor:`, `perf:` prefix

### Fixed
- Bug fixes from commits with `fix:` prefix

### Removed
- Removals mentioned in commit messages
```

**Infer categories from:**
1. Conventional commit prefixes in `git log main..HEAD --oneline`
2. File types changed (test files → test improvements, docs → documentation)
3. Diff content (new functions = Added, modified functions = Changed)

## Main Branch Detection

```bash
git symbolic-ref refs/remotes/origin/HEAD 2>/dev/null | sed 's@^refs/remotes/origin/@@'
```

Fallback: check if `main` or `master` exists:
```bash
git rev-parse --verify origin/main 2>/dev/null && echo "main" || echo "master"
```