From a486a8e2fa5311422ec5dd295c4a3bd746f56e70 Mon Sep 17 00:00:00 2001
From: Kamen Mladenov <kamen@syndamia.com>
Date: Thu, 27 Feb 2025 10:28:28 +0200
Subject: feat: Add script for formatting all rust files in a directory

This is meant to be used in our codebase, especially in CI pipelines
---
 flake.nix           |  4 +++-
 rust-format-all.nix | 20 ++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 rust-format-all.nix

diff --git a/flake.nix b/flake.nix
index 332eae4..ee34c17 100644
--- a/flake.nix
+++ b/flake.nix
@@ -68,6 +68,8 @@
       {}
       guests;
   in {
-    packages.${system} = hostPackages // guestPackages;
+    packages.${system} = hostPackages // guestPackages // {
+      rust-format-all = callPackage ./rust-format-all.nix { };
+    };
   };
 }
diff --git a/rust-format-all.nix b/rust-format-all.nix
new file mode 100644
index 0000000..710f1ef
--- /dev/null
+++ b/rust-format-all.nix
@@ -0,0 +1,20 @@
+{ writeShellApplication
+, rustfmt
+,
+}:
+writeShellApplication {
+  name = "rustfmt_all";
+
+  runtimeInputs = [ rustfmt ];
+
+  text = ''
+    # Using rustfmt instead of cargo fmt, because the latter doesn't support proc-macro crates
+    # Additionally, instead of emitting an error, it will "hang", waiting for input
+    while read -r file
+    do
+      rustfmt --edition 2021 -v "$@" "$file" || exit $?
+    done <<EOF
+    $(find . -type f -name "*.rs" -not -path "*target*")
+    EOF
+  '';
+}
-- 
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