From e8da6869f8e0a051e8768135b57950e9f8ed27b9 Mon Sep 17 00:00:00 2001
From: mo8it <mo8it@proton.me>
Date: Sat, 28 Jun 2025 01:19:44 +0200
Subject: [PATCH] Don't run rustfmt during `dev check` if there are no
 solutions

---
 src/dev/check.rs | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/dev/check.rs b/src/dev/check.rs
index 9cde7f24..6ea8d89a 100644
--- a/src/dev/check.rs
+++ b/src/dev/check.rs
@@ -354,16 +354,18 @@ fn check_solutions(
     }
     stdout.write_all(b"\n")?;
 
+    let n_solutions = sol_paths.len();
     let handle = thread::Builder::new()
         .spawn(move || check_unexpected_files("solutions", &sol_paths))
         .context(
             "Failed to spawn a thread to check for unexpected files in the solutions directory",
         )?;
 
-    if !fmt_cmd
-        .status()
-        .context("Failed to run `rustfmt` on all solution files")?
-        .success()
+    if n_solutions > 0
+        && !fmt_cmd
+            .status()
+            .context("Failed to run `rustfmt` on all solution files")?
+            .success()
     {
         bail!("Some solutions aren't formatted. Run `rustfmt` on them");
     }