From 0b73a970af39521bd9be1465bbe28702de9c6f9c Mon Sep 17 00:00:00 2001
From: Thomas Gerbet <thomas@gerbet.me>
Date: Sat, 25 Jul 2026 13:03:48 +0200
Subject: [PATCH] treefmt.withConfig: prevent an empty path segment in PATH
 when `config.runtimeInputs` is empty

---
 pkgs/by-name/tr/treefmt/modules/wrapper.nix | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/pkgs/by-name/tr/treefmt/modules/wrapper.nix b/pkgs/by-name/tr/treefmt/modules/wrapper.nix
index b394912ce0b1..2d1a7b6d58c9 100644
--- a/pkgs/by-name/tr/treefmt/modules/wrapper.nix
+++ b/pkgs/by-name/tr/treefmt/modules/wrapper.nix
@@ -31,10 +31,15 @@
         wrapper = finalAttrs.finalPackage;
       };
     };
-    postBuild = ''
-      wrapProgram "$out/bin/treefmt" \
-        --prefix PATH : "$binPath" \
-        --add-flags "--config-file $configFile"
-    '';
+    postBuild =
+      let
+        wrapPrefixPathArgument = lib.optionalString (
+          config.runtimeInputs != [ ]
+        ) "--prefix PATH : \"$binPath\"";
+      in
+      ''
+        wrapProgram "$out/bin/treefmt" \
+          --add-flags "--config-file $configFile " ${wrapPrefixPathArgument}
+      '';
   });
 }