feat(config): add support for string slice flags in traverseStruct

[aaronschweig]

Summary by CodeRabbit

• New Features

  • Configuration now supports string list options. Command-line flags can accept multiple values for settings defined as lists of strings.

• Improved Error Handling

  • Clearer validation for list-type options: non-string list types are rejected with an informative error message.

[coderabbitai]

Walkthrough

Adds handling for string slice fields in configuration traversal: registers StringSlice flags for []string and errors for slices with non-string element types. Updates tests to include a valid []string slice field and adjusts the unsupported-type test to use []int.

Changes

Cohort / File(s)	Summary of Changes
Config traversal config/config.go	Implemented slice handling: if field is a slice of string, register a StringSlice flag with empty []string default; if slice element type is non-string, return an error indicating illegal element type. Previously, slices were treated as unsupported.
Tests config/config_test.go	Added Slice []string field to test struct and corresponding assertions in TestBindConfigToFlags. Modified TestGenerateFlagSetUnsupportedType to use []int to validate unsupported slice element types.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 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 primary change by indicating that support for string slice flags has been added to traverseStruct, matching the modifications in the code. It follows a conventional commit style, references the config package scope, and highlights the specific feature implemented. This ensures that team members scanning the history will immediately understand the main purpose of the pull request.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/support-strings-slice-arg

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (2)

config/config.go (1)

169-173: Consider handling the default tag for string slices.

The code correctly validates string slices and registers the flag, but unlike other field types (string, int, bool, duration at lines 130-168), it doesn't parse or apply the default tag. Users might expect to specify comma-separated default values via default:"value1,value2".

If default value support is desired, consider parsing defaultStrValue and splitting it:

 		case reflect.Slice:
 			if fieldValue.Type().Elem().Kind() != reflect.String {
 				return fmt.Errorf("unsupported slice element type %s for field %s", fieldValue.Type().Elem().Kind(), field.Name)
 			}
-			flagSet.StringSlice(prefix+tag, []string{}, description)
+			defaultSlice := []string{}
+			if defaultStrValue != "" {
+				defaultSlice = strings.Split(defaultStrValue, ",")
+			}
+			flagSet.StringSlice(prefix+tag, defaultSlice, description)

config/config_test.go (1)

39-39: Add assertions to verify the slice flag.

The Slice field is added to the test struct but the test doesn't verify that the flag was registered correctly. For consistency with other flags validated in this test (lines 49-77), consider adding assertions:

Add assertions after line 77:

	sliceFlag := cmd.Flags().Lookup("slice")
	assert.NotNil(t, sliceFlag)
	assert.Equal(t, "This is a slice of strings", sliceFlag.Usage)
	assert.Equal(t, "[]", sliceFlag.DefValue)

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 5272cdc and 19325e7.

📒 Files selected for processing (2)

• config/config.go (1 hunks)
• config/config_test.go (2 hunks)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)

• GitHub Check: pipe / lint / lint
• GitHub Check: Analyze (go)

🔇 Additional comments (1)

config/config_test.go (1)

175-175: LGTM!

Correctly updated the unsupported type test to use []int instead of []string, preserving the test's intent now that string slices are supported.