From e167b04b8595990649993ce5f0c5de2c9f73af78 Mon Sep 17 00:00:00 2001
From: vlakoff <544424+vlakoff@users.noreply.github.com>
Date: Mon, 20 Apr 2026 04:48:32 +0200
Subject: [PATCH] Warn when Zopfli --ziwi exceeds --zi (#812)

---
 src/main.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/main.rs b/src/main.rs
index 214a0ae9..63a7bf45 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -430,6 +430,16 @@ fn parse_opts_into_struct(
         let iterations_without_improvement = *matches
             .get_one::<NonZeroU64>("iterations-without-improvement")
             .unwrap_or(&NonZeroU64::MAX);
+
+        if iterations_without_improvement > iteration_count
+            && iterations_without_improvement != NonZeroU64::MAX
+        {
+            warn!(
+                "--ziwi ({}) is higher than --zi ({}) and will never be reached.",
+                iterations_without_improvement, iteration_count
+            );
+        }
+
         opts.deflater = Deflater::Zopfli(ZopfliOptions {
             iteration_count,
             iterations_without_improvement,