[leodido]

This PR adds support for preserving configured initialisms in generated const identifiers.

Example:

• Without flag: http_url -> EndpointHttpUrl
• With --initialism HTTP,URL: http_url -> EndpointHTTPURL

The implementation is token-aware to avoid partial-word rewrites (for example, apiary is not rewritten to APIary).

Motivation

go-enum currently generates idiomatic CamelCase, but projects with common initialisms (HTTP, URL, ID, API, JSON, etc.) need stable Go-style identifier casing without changing enum string values.

This also aligns with Go naming conventions, where initialisms are typically kept in a consistent form in identifiers (for example, HTTP, URL, ID).

What Changed

1. CLI/API naming

• Add new repeatable flag: --initialism (comma-separated values supported).
• Add parser: ParseInitialisms([]string) with validation and deduplication.
• Add config field: GeneratorConfig.Initialisms.
• Add option: WithInitialisms(...).

2. Naming pipeline

• Apply initialism rewriting during const identifier generation.
• Rewriting is token-aware (not substring/global replace).
• Prevents false positives such as apiary -> APIary and ideology -> IDEology.

3. Tests

• Added/updated parser tests, integration tests, ordering tests, and regression tests for substring false positives.
• Added focused tokenizer tests for boundary rules used by shouldSplitToken/splitIdentifierTokens.

4. Docs

• Added --initialism to command options.
• Added a dedicated "Initialism notes" section documenting behavior and interactions.

Behavior and Interactions

• --initialism affects generated const identifiers only.
• It does not modify enum string values.
• --forcelower and --forceupper remain value-focused and independent.
• Rewriting runs after alias sanitization and after snake_case -> CamelCase conversion.
• With --nocamel, underscore-separated initialisms may not be rewritten because CamelCase conversion is skipped.
• Rewriting currently applies to the full identifier (including prefix/type-derived segments), not just the value-derived segment.

Example of full-identifier behavior:

// ENUM(created)
type UserId int

With --initialism ID, generated const is UserIDCreated.

Validation

Commands run:

go test ./...
go test ./generator -run 'TestShouldSplitToken|TestSplitIdentifierTokens|TestInitialism|TestInitialisms' -v

Coverage snapshots on this branch:

• Total statements: 92.2%
• generator package: 95.7%
• ParseInitialisms: 100%
• splitIdentifierTokens: 100%
• shouldSplitToken: 100%

Summary by CodeRabbit

• New Features

  • Added a repeatable --initialism option for configuring uppercase initialisms in generated constant names.
  • Initialisms are applied across supported naming styles and enum types, including converting Id to ID; generated string values remain unchanged.
  • Comma-separated entries are supported. Invalid entries are rejected, while duplicates and empty entries are ignored.

• Documentation

  • Documented the option’s behavior, ordering, interactions with naming flags, and usage examples.

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📒 Files selected for processing (2)

• generator/generator.go
• generator/generator_test.go

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📝 Walkthrough

Walkthrough

The generator accepts configured initialisms through the CLI or Go options. It validates and deduplicates initialism values, then rewrites matching identifier tokens in generated enum constant names. Tests cover parsing, token boundaries, and naming modes. The README documents the CLI option.

Changes

Configurable initialism support

Layer / File(s)	Summary
Initialism configuration and CLI input generator/options.go, generator/generator.go, main.go, generator/generator_test.go	GeneratorConfig stores initialisms, and WithInitialisms appends values. The CLI accepts repeatable --initialism values, validates them with ParseInitialisms, and passes them to generator configuration. Tests cover configuration and parsing.
Enum identifier initialism rewriting generator/generator.go, generator/generator_test.go	The generator builds replacement mappings, splits identifiers at token boundaries, and applies configured initialisms to enum constant names. Tests cover token boundaries, naming modes, and generated names while checking that enum string values remain unchanged.
Initialism option documentation README.md	The README documents the repeatable option, processing order, naming interactions, and an example.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant CLI
  participant ParseInitialisms
  participant GeneratorConfig
  participant NewGeneratorWithConfig
  participant EnumNameGeneration
  participant applyInitialisms
  CLI->>ParseInitialisms: Parse and validate initialism values
  ParseInitialisms->>GeneratorConfig: Provide configured initialisms
  GeneratorConfig->>NewGeneratorWithConfig: Build replacement mappings
  EnumNameGeneration->>applyInitialisms: Rewrite converted enum identifier
  applyInitialisms-->>EnumNameGeneration: Return the rewritten identifier

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Merge Risk: ⚪ Minimal · up to 32679

The change preserves enum string values and documented naming behavior. It is mergeable subject to normal checks.

Security Architecture Review

Security architecture risk: ⚪ Minimal · up to 32679

The opt-in casing change stays within existing local code-generation authority. The reviewed path preserves enum values and introduces no material security risk.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The reviewed exposure is the invoking caller’s generated Go output and downstream source references. The base-to-head CLI change does not expand file selection, output-path authority, or template selection.

Trust Boundaries and Controls

• observed — CLI-supplied entries pass through ParseInitialisms before use. Direct GeneratorConfig and WithInitialisms callers do not automatically receive that validation; their entries are converted into matching keys and uppercase replacements within the generator.

Resilience and Maintainability Implications

• inferred — The new naming step constructs replacements before generation and only reads them during rewriting. It introduces no new reservation, persistent state, or cleanup transition. Existing sequential file writes remain unchanged, including their lack of an all-files rollback.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 34.78% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 23 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding the repeatable --initialism flag with token-aware constant identifier casing.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@generator/generator.go`:
- Line 94: Update the initialism setup used by GeneratorConfig and
WithInitialisms so programmatic values are normalized or rejected consistently
with ParseInitialisms; store uppercase replacement values so inputs such as
“http” produce HTTP for no-prefix matches. Ensure all programmatic entry points
enforce the same contract.

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Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 00234acb-92e4-4801-8486-501da6bb6136

📥 Commits

Reviewing files that changed from the base of the PR and between 9d73c76 and 271db0a.

📒 Files selected for processing (5)

• README.md
• generator/generator.go
• generator/generator_test.go
• generator/options.go
• main.go

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