Refactor collectors

Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

pkg/utils/collector.go

@@ -0,0 +1,36 @@
+//go:build windows
+
+package utils
+
+import (
+	"slices"
+	"sort"
+	"strings"
+
+	"github.com/prometheus-community/windows_exporter/pkg/types"
+)
+
+// ExpandEnabledChildCollectors used by more complex Collectors where user input specifies enabled child Collectors.
+// Splits provided child Collectors and deduplicate.
+func ExpandEnabledChildCollectors(enabled string) []string {
+	result := slices.Compact(strings.Split(enabled, ","))
+	// Ensure result is ordered, to prevent test failure
+	sort.Strings(result)
+	return result
+}
+
+func ExpandEnabledCollectors(enabled string) []string {
+	expanded := strings.Replace(enabled, types.DefaultCollectorsPlaceholder, types.DefaultCollectors, -1)
+	separated := strings.Split(expanded, ",")
+	unique := map[string]bool{}
+	for _, s := range separated {
+		if s != "" {
+			unique[s] = true
+		}
+	}
+	result := make([]string, 0, len(unique))
+	for s := range unique {
+		result = append(result, s)
+	}
+	return result
+}