feat: add injectVariables(), support magic variables for MCPs (workspaceFolder)

[NamesMT]

Related GitHub Issue

Closes: #4017

Description

I added a new utility: injectVariables(config, vars), and used it

Test Procedure

I wrote some unit tests and used Extension Debug mode to test the real usage, confirming everything works as expected.

Type of Change

• 🐛 Bug Fix: Non-breaking change that fixes an issue.
• ✨ New Feature: Non-breaking change that adds functionality.
• 💥 Breaking Change: Fix or feature that would cause existing functionality to not work as expected.
• ♻️ Refactor: Code change that neither fixes a bug nor adds a feature.
• 💅 Style: Changes that do not affect the meaning of the code (white-space, formatting, etc.).
• 📚 Documentation: Updates to documentation files.
• ⚙️ Build/CI: Changes to the build process or CI configuration.
• 🧹 Chore: Other changes that don't modify src or test files.

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Code Quality:
  • My code adheres to the project's style guidelines.
  • There are no new linting errors or warnings (npm run lint).
  • All debug code (e.g., console.log) has been removed.
• Testing:
  • New and/or updated tests have been added to cover my changes.
  • All tests pass locally (npm test).
  • The application builds successfully with my changes.
• Branch Hygiene: My branch is up-to-date (rebased) with the main branch.
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Changeset: A changeset has been created using npm run changeset if this PR includes user-facing changes or dependency updates.
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Documentation Updates

Additional Notes

Get in Touch

NamesMT / @topnames_mt

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Important

Adds injectVariables utility to inject variables into configurations, replacing injectEnv in McpHub.ts, with tests in config.test.ts.

• New Functionality:
  • Adds injectVariables(config, vars) in config.ts to inject variables into configurations, supporting nested variables and handling null or undefined values.
  • Replaces injectEnv with injectVariables in McpHub.ts to inject environment and magic variables (e.g., workspaceFolder).
• Testing:
  • Adds unit tests for injectVariables in config.test.ts, covering variable replacement and handling of undefined or empty values.
  • Updates existing tests for injectEnv to reflect changes in variable handling.

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[adamhill]

Coolio!

Dockerized MCP Servers for Roo Marketplace FTW!!!

Now if we can figure out how to compose multiples of those in the Docker MCP ecosystem... bobs our uncle!

[daniel-lxs]

Hey @NamesMT, Thank you for your contribution!

I left a minor suggestion but looks good to me!

[NamesMT]

Hi @daniel-lxs, please help me check the latest state, I've added InjectableConfigType to deeply describe the valid config parameter and update the tests to be a bit more thorough too.
I also properly use the defined C type for config, previously I forgot to use it and redeclare the type.