refactor /cmd/prune/main.go#ls to /pkg/fs/ls.go

pkg/fs/ls.go

@@ -0,0 +1,29 @@
+package fs
+
+import (
+	"os"
+	"path"
+	"sort"
+)
+
+func LsD(d string) ([]string, error) {
+	return ls(d, true)
+}
+
+func LsF(d string) ([]string, error) {
+	return ls(d, false)
+}
+
+func ls(d string, dirs bool) ([]string, error) {
+	entries, err := os.ReadDir(d)
+
+	results := make([]string, 0, len(entries))
+	for i := range entries {
+		if dirs == entries[i].IsDir() {
+			results = append(results, path.Join(d, entries[i].Name()))
+		}
+	}
+	sort.Strings(results)
+
+	return results, err
+}