libluna: Let String::join take a vector of StringViews instead of Strings

libluna/include/luna/String.h

@@ -55,6 +55,9 @@ class String
     /* Creates a single String consisting of a list of strings separated by a delimiter. */
     static Result<String> join(const Vector<String>& vec, StringView delim);
 
+    /* Creates a single String consisting of a list of strings separated by a delimiter. */
+    static Result<String> join(const Vector<StringView>& vec, StringView delim);
+
     /* Removes all trailing characters contained in delim. */
     void trim(StringView delim);
 

libluna/src/String.cpp

@@ -181,6 +181,23 @@ Result<String> String::join(const Vector<String>& vec, StringView delim)
     return sb.string();
 }
 
+Result<String> String::join(const Vector<StringView>& vec, StringView delim)
+{
+    if (vec.size() == 0) return String {};
+    if (vec.size() == 1) return from_string_view(vec[0]);
+
+    StringBuilder sb;
+    TRY(sb.add(vec[0]));
+
+    for (usize i = 1; i < vec.size(); i++)
+    {
+        TRY(sb.add(delim));
+        TRY(sb.add(vec[i]));
+    }
+
+    return sb.string();
+}
+
 int String::compare(const String* a, const String* b)
 {
     return strcmp(a->chars(), b->chars());