Add opt-in configuration overrides

integrations/ckconfig/overrides.go

@@ -0,0 +1,65 @@
+package ckconfig
+
+import (
+	"fmt"
+	"strings"
+
+	commandkit "go.maximumdirect.net/commandkit"
+	configkit "go.maximumdirect.net/configkit"
+)
+
+func supportsOverrides[I, S any](prepared *preparedSuite[I, S], operation Operation) bool {
+	for _, scope := range prepared.scopes {
+		if scope.scope.Features.Overrides && containsOperation(scope.scope.Operations, operation) {
+			return true
+		}
+	}
+	return false
+}
+
+func overrideParser(flag string) func(string) (configkit.Override, error) {
+	return func(raw string) (configkit.Override, error) {
+		pointer, jsonText, ok := strings.Cut(raw, "=")
+		if !ok {
+			return configkit.Override{}, fmt.Errorf("override requires POINTER=JSON")
+		}
+		path, err := configkit.ParsePath(pointer)
+		if err != nil {
+			return configkit.Override{}, fmt.Errorf("invalid override path: %w", err)
+		}
+		value, err := commandkit.ParseCLIJSON(jsonText)
+		if err != nil {
+			return configkit.Override{}, fmt.Errorf("invalid override JSON: %w", err)
+		}
+		return configkit.Override{Path: path, Value: value, Flag: flag}, nil
+	}
+}
+
+func cloneSelection(selection Selection) Selection {
+	if selection.Overrides != nil {
+		selection.Overrides = append([]configkit.Override(nil), selection.Overrides...)
+		for index := range selection.Overrides {
+			selection.Overrides[index].Value = cloneCLIValue(selection.Overrides[index].Value)
+		}
+	}
+	return selection
+}
+
+func cloneCLIValue(value any) any {
+	switch value := value.(type) {
+	case []any:
+		copy := make([]any, len(value))
+		for index, element := range value {
+			copy[index] = cloneCLIValue(element)
+		}
+		return copy
+	case map[string]any:
+		copy := make(map[string]any, len(value))
+		for key, element := range value {
+			copy[key] = cloneCLIValue(element)
+		}
+		return copy
+	default:
+		return value
+	}
+}