refactor(utils): move part helpers & add artifact text extractor

[martimfasantos]

Description

This pull request refactors utility functions for handling Part objects by moving them from src/a2a/utils/message.py to a new dedicated module src/a2a/utils/parts.py. It also introduces a new helper function for extracting text from Artifacts and updates imports and exports to reflect these changes. The goal is to improve code organization and clarity by grouping similar functionality.

Refactoring and organization:

• Moved the functions get_text_parts, get_data_parts, and get_file_parts from src/a2a/utils/message.py into a new module src/a2a/utils/parts.py, providing better separation of concerns for part-handling utilities. [1] [2]
• Updated imports in src/a2a/utils/__init__.py to re-export these part-handling functions from the new parts module, and removed their previous import from the message module. [1] [2] [3]

New functionality:

• Added the new function get_artifact_text to src/a2a/utils/artifact.py for extracting and joining all text content from an artifact's parts, using the refactored get_text_parts. [1] [2] [3] [4]

These changes improve maintainability by clearly separating message-related and part-related utilities, and by introducing a helper for artifact text extraction.

---

BEGIN_COMMIT_OVERRIDE
refactor(utils): move part helpers to their own file
feat: add get_artifact_text() helper method

Release-As: 0.3.10
END_COMMIT_OVERRIDE

[gemini-code-assist]

Summary of Changes

Hello @martimfasantos, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the codebase's maintainability and clarity by reorganizing utility functions. It isolates "Part" object handling into its own module, "src/a2a/utils/parts.py", and introduces a new function for extracting text from "Artifacts". These changes streamline the codebase, making it easier to understand and manage related functionalities.

Highlights

• Code Refactoring for Part Handling: Utility functions for handling "Part" objects ("get_text_parts", "get_data_parts", "get_file_parts") have been moved from "src/a2a/utils/message.py" to a new dedicated module "src/a2a/utils/parts.py" to improve code organization and separation of concerns.
• New Artifact Text Extraction: A new helper function, "get_artifact_text", has been introduced in "src/a2a/utils/artifact.py" to efficiently extract and join all text content from an "Artifact"'s parts.
• Module Import/Export Updates: The "src/a2a/utils/init.py" file has been updated to reflect the refactoring, re-exporting the part-handling functions from the new "parts" module and importing the new "get_artifact_text" function.

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[gemini-code-assist]

Code Review

This pull request does a good job of refactoring the part-related utility functions into a new parts.py module, which improves code organization. The addition of get_artifact_text is also a useful helper.

However, I've found a critical issue with circular dependencies introduced by the new imports in artifact.py and message.py. Both modules now import from the a2a.utils package, which itself imports from them, creating a cycle. My review comments provide suggestions to fix this by preventing runtime import errors.

Additionally, there are a couple of points regarding testing:

• The new function get_artifact_text is missing unit tests. I've added a suggestion to include them.
• The existing tests for the moved functions (get_text_parts, etc.) in tests/utils/test_message.py will likely fail because the functions have been moved. These tests should be updated to import from the new location (a2a.utils.parts or a2a.utils) and ideally moved to a new tests/utils/test_parts.py file to align with the new code structure. It seems the test files were not part of this PR, so you'll need to add them.