Wrap formatting into printToString

printToString gets the output string as argument and can be called
recursive with the same output string to format ranges.

1 files changed, 8 insertions, 3 deletions

diff --git a/source/tanya/format/package.d b/source/tanya/format/package.d
index d542529..e283c3d 100644
--- a/source/tanya/format/package.d
+++ b/source/tanya/format/package.d
@@ -505,10 +505,9 @@ if (T.sizeof == U.sizeof)
     copy((&src)[0 .. 1], (&dest)[0 .. 1]);
 }
 
-package(tanya) String format(string fmt, Args...)(auto ref Args args)
+private ref String printToString(string fmt, Args...)(return ref String result,
+                                                      auto ref Args args)
 {
-    String result;
-
     static if (is(Unqual!(Args[0]) == typeof(null)))
     {
         result.insertBack("null");
@@ -758,6 +757,12 @@ ParamEnd:
     return result;
 }
 
+package(tanya) String format(string fmt, Args...)(auto ref Args args)
+{
+    String formatted;
+    return printToString!fmt(formatted, args);
+}
+
 // One argument tests.
 @nogc pure @safe unittest
 {