From 29383dfd49717b804fd946a657c70e31b7aa8979 Mon Sep 17 00:00:00 2001
From: Quentin Gliech <quenting@element.io>
Date: Tue, 2 Dec 2025 17:51:51 +0100
Subject: [PATCH] Add a template function to compute the avatar color hash same
 as Compound Web

---
 crates/templates/src/functions.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/crates/templates/src/functions.rs b/crates/templates/src/functions.rs
index 9d764e032..cb4603de0 100644
--- a/crates/templates/src/functions.rs
+++ b/crates/templates/src/functions.rs
@@ -41,6 +41,7 @@ pub fn register(
     env.add_filter("simplify_url", filter_simplify_url);
     env.add_filter("add_slashes", filter_add_slashes);
     env.add_filter("parse_user_agent", filter_parse_user_agent);
+    env.add_filter("id_color_hash", filter_id_color_hash);
     env.add_function("add_params_to_url", function_add_params_to_url);
     env.add_function("counter", || Ok(Value::from_object(Counter::default())));
     if let Some(vite_manifest) = vite_manifest {
@@ -138,6 +139,12 @@ fn filter_simplify_url(url: &str, kwargs: Kwargs) -> Result<String, minijinja::E
     }
 }
 
+/// Filter which computes a hash between 1 and 6 of an input string, similar to
+/// compound-web's useIdColorHash
+fn filter_id_color_hash(input: &str) -> u32 {
+    input.chars().fold(0, |hash, c| hash + c as u32) % 6 + 1
+}
+
 /// Filter which parses a user-agent string
 fn filter_parse_user_agent(user_agent: String) -> Value {
     let user_agent = mas_data_model::UserAgent::parse(user_agent);