From 99a9603b8754664de1e2843aefc0dac25febc875 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Fri, 21 Aug 2026 13:05:50 -0400
Subject: [PATCH] For *.rs.erb, set eruby_subtype to "rust"

---
 plugin/holtrop.lua | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/plugin/holtrop.lua b/plugin/holtrop.lua
index 366eb21..40d4ecc 100644
--- a/plugin/holtrop.lua
+++ b/plugin/holtrop.lua
@@ -102,3 +102,14 @@ vim.api.nvim_create_autocmd({ "FocusGained", "BufEnter" }, {
 })
 
 vim.filetype.add({filename = {["Rsconscript"] = "ruby"}})
+
+-- Treat *.rs.erb files as eruby with an embedded Rust subtype
+vim.filetype.add({
+  pattern = {
+    [".*%.rs%.erb"] = function(_, bufnr)
+      return "eruby", function()
+        vim.b[bufnr].eruby_subtype = "rust"
+      end
+    end,
+  },
+})