ccextractor

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Carlos Fernandez 91d3512bcc fix(rust): Support BCP 47 language tags in --mkvlang option

The --mkvlang option previously only supported single ISO 639-2 codes
due to using a Language enum with a fixed list of variants. Extended
codes (like "fre-ca") and multiple codes (like "eng,chi") would panic.

This change introduces MkvLangFilter, a proper type for language
filtering that:

- Validates language codes per BCP 47 specification
- Supports ISO 639-2 (3-letter codes like "eng")
- Supports BCP 47 tags (like "en-US", "zh-Hans-CN")
- Supports comma-separated multiple codes
- Provides clean error messages for invalid input
- Includes comprehensive unit tests

The C code continues to receive the raw string for strstr() matching,
maintaining backward compatibility.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-18 13:23:39 -08:00