feat: manifest command group for adding and listing flags in manifest

[georgesdugue]

This PR

• Adds openfeature manifest command group for managing flag manifest files
• Adds manifest add subcommand to add new flags to manifests with type validation and duplicate detection
• Adds manifest list subcommand to display all flags in a formatted table view
• Implements comprehensive type validation for all five flag types (boolean, string, integer, float, object)
• Automatically creates new manifest files if they don't exist
• Displays updated flag list after successful additions

Related Issues

Fixes #153

Notes

• The manifest add command validates default values against the specified flag type before adding to the manifest
• Long descriptions and values are automatically truncated in the list view for better readability
• Both commands include extensive unit test coverage with edge case handling

Follow-up Tasks

None

How to test

Testing manifest add:

# Add a boolean flag
openfeature manifest add new-feature --default-value false --description "Enable new feature"

# Add a string flag
openfeature manifest add welcome-message --type string --default-value "Hello!" --description "Welcome message for users"

# Add an integer flag
openfeature manifest add max-retries --type integer --default-value 3

# Add a float flag
openfeature manifest add discount-rate --type float --default-value 0.15

# Add an object flag
openfeature manifest add config --type object --default-value '{"key":"value"}'

# Test error handling - try adding duplicate flag
openfeature manifest add new-feature --default-value true
# Should error: "flag 'new-feature' already exists in the manifest"

[gemini-code-assist]

Summary of Changes

Hello @georgesdugue, 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 OpenFeature CLI by introducing a dedicated command group for managing feature flag manifests. It provides users with the ability to easily add new flags to a manifest, complete with type validation and duplicate checks, and to view existing flags in a clear, tabular format. This streamlines the process of defining and maintaining feature flags directly from the command line, improving developer experience and consistency.

Highlights

• New Manifest Command Group: Introduces a new openfeature manifest command group to centralize feature flag manifest management within the CLI.
• Add Flags to Manifest: Adds a manifest add subcommand for creating new feature flags, featuring robust type validation (boolean, string, integer, float, object) and detection of duplicate flag names.
• List Flags in Manifest: Implements a manifest list subcommand to display all flags in a manifest in a user-friendly, formatted table, including automatic truncation for long descriptions and values for better readability.
• Automatic Manifest Creation: Enables automatic creation of a new manifest file if one does not exist when a flag is added, simplifying initial setup.
• Comprehensive Testing: Includes extensive unit tests for both the add and list commands, covering various flag types, error handling, and manifest creation scenarios to ensure reliability.

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[gemini-code-assist]

Code Review

This pull request introduces new manifest commands for managing feature flags, including add and list. The implementation is solid and includes comprehensive tests. My review focuses on improving error handling robustness, code maintainability by removing magic numbers, and adhering to standard Go formatting conventions.

[kriscoleman]

UAT

worked very well!

[kriscoleman]

approved!

we'll just need to address the pr lint and pr test failures @georgesdugue

[georgesdugue]

approved!

we'll just need to address the pr lint and pr test failures @georgesdugue

Thank you! Will address the failing checks soon.

[georgesdugue]

It looks like @kriscoleman's PR #167 has the fix for the Generator Integration Tests failure. I can wait for it to merge and rebase.

[beeme1mr]

Hey @georgesdugue, I'll try and take a look at this tonight. Thanks!

[beeme1mr]

I left some feedback but approved. Thanks!

[kriscoleman]

@georgesdugue this is ready for rebase now!