From 91c27535921f4a8049a1874c03de3c50a17b8b28 Mon Sep 17 00:00:00 2001
From: Sijawusz Pur Rahnama <sija@sija.pl>
Date: Sun, 16 Jun 2024 22:29:58 +0200
Subject: [PATCH] Use `String.build` instead of concatenation

---
 src/ext/kemal_gphoto2.cr | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/src/ext/kemal_gphoto2.cr b/src/ext/kemal_gphoto2.cr
index 967a9ec..de0d44f 100644
--- a/src/ext/kemal_gphoto2.cr
+++ b/src/ext/kemal_gphoto2.cr
@@ -146,16 +146,17 @@ def send_file(env, file : GPhoto2::CameraFile, *, format : ImageOutputFormat?, w
       end
     end
 
-    filename = path.stem
-    filename += "-w#{width}" if width
-    filename += "-h#{height}" if height
-    filename +=
-      if path.extension.chars.select!(&.letter?).all?(&.uppercase?)
-        format.extension.upcase
-      else
-        format.extension
-      end
-
+    filename = String.build do |str|
+      str << path.stem
+      str << "-w#{width}" if width
+      str << "-h#{height}" if height
+      str <<
+        if path.extension.chars.select!(&.letter?).all?(&.uppercase?)
+          format.extension.upcase
+        else
+          format.extension
+        end
+    end
     disposition ||= "inline"
 
     send_file env, format.to_slice(image),