From f91b3b6a6c406b821db8b799de8138fe6aca5809 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Fri, 19 Dec 2025 20:57:40 +0000
Subject: [PATCH] Add string util for `#[serde(deserialize_with =
 "deserialize::to_lowercase")]`

Signed-off-by: Jason Volk <jason@zemos.net>
---
 src/core/utils/string.rs    |  1 +
 src/core/utils/string/de.rs | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 src/core/utils/string/de.rs

diff --git a/src/core/utils/string.rs b/src/core/utils/string.rs
index 12b1ef2e..854d5d4b 100644
--- a/src/core/utils/string.rs
+++ b/src/core/utils/string.rs
@@ -1,4 +1,5 @@
 mod between;
+pub mod de;
 mod split;
 mod tests;
 mod unquote;
diff --git a/src/core/utils/string/de.rs b/src/core/utils/string/de.rs
new file mode 100644
index 00000000..08eb403c
--- /dev/null
+++ b/src/core/utils/string/de.rs
@@ -0,0 +1,22 @@
+use std::fmt;
+
+use serde::de::{Deserializer, Error, Visitor};
+
+struct ToLowercase;
+
+#[inline]
+pub fn to_lowercase<'de, D>(deserializer: D) -> Result<String, D::Error>
+where
+	D: Deserializer<'de>,
+{
+	deserializer.deserialize_string(ToLowercase)
+}
+
+impl Visitor<'_> for ToLowercase {
+	type Value = String;
+
+	#[inline]
+	fn visit_str<E: Error>(self, v: &str) -> Result<Self::Value, E> { Ok(v.to_lowercase()) }
+
+	fn expecting(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { f.write_str("String") }
+}