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@@ -134,4 +134,25 @@ done
     "--",
 ]
 includes = ["*.tf"]
+```
+
+## Using treefmt in a nix-build
+
+```nix
+{ src # src should point to the project to check the format for
+, runCommandNoCC
+, shfmt
+, rustfmt
+, treefmt
+}:
+runCommandNoCC "treefmt" {
+  # add all your formatters here
+  nativeBuildInputs = [ shfmt rustfmt treefmt ];
+} ''
+  # keep timestamps so that treefmt is able to detect mtime changes
+  cp --no-preserve=mode --preserve=timestamps -r ${src} source
+  cd source
+  HOME=$TMPDIR treefmt --fail-on-change
+  touch $out
+'';
 ```