From aef40df1c432d51c5a75c9d94589a8e9577e0573 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 29 May 2019 18:53:44 +0200
Subject: Improve url::string() to handle empty scheme

---
 libbutl/url.txx | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/libbutl/url.txx b/libbutl/url.txx
index 7e3fddb..3f07eb8 100644
--- a/libbutl/url.txx
+++ b/libbutl/url.txx
@@ -430,14 +430,18 @@ LIBBUTL_MODEXPORT namespace butl //@@ MOD Clang needs this for some reason.
     if (!u.empty ())
       return u;
 
-    r += ':';
+    if (!r.empty ())
+      r += ':';
 
     if (authority)
     {
       // We can't append '//' string literal, so appending characters.
       //
-      r += '/';
-      r += '/';
+      if (!r.empty ())
+      {
+        r += '/';
+        r += '/';
+      }
 
       r += authority->string ();
     }
-- 
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