Introduce quoteString utility function

Author: Ericson2314

src/libutil/include/nix/util/util.hh

@@ -33,15 +33,28 @@ auto concatStrings(Parts &&... parts)
     return concatStringsSep({}, views);
 }
 
+/**
+ * Add quotes around a string.
+ */
+inline std::string quoteString(std::string_view s, char quote = '\'')
+{
+    std::string result;
+    result.reserve(s.size() + 2);
+    result += quote;
+    result += s;
+    result += quote;
+    return result;
+}
+
 /**
  * Add quotes around a collection of strings.
  */
 template<class C>
-Strings quoteStrings(const C & c)
+Strings quoteStrings(const C & c, char quote = '\'')
 {
     Strings res;
     for (auto & s : c)
-        res.push_back("'" + s + "'");
+        res.push_back(quoteString(s, quote));
     return res;
 }