diff --git a/.config/nvim/init.lua b/.config/nvim/init.lua
--- a/.config/nvim/init.lua
+++ b/.config/nvim/init.lua
@@ -6,3 +6,7 @@
 require("config.autocmds")
 require("config.user_commands")
 require("config.keymaps")
+
+vim.filetype.add({
+  extension = { rn = "rune" },
+})
diff --git a/.config/oyui/config.rn b/.config/oyui/config.rn
--- a/.config/oyui/config.rn
+++ b/.config/oyui/config.rn
@@ -1,30 +1,36 @@
 // Rune language documentation at: https://rune-rs.github.io/
 // this is your entrypoint...
 pub fn config() {
-  // Oyui comes with 40+ built-in themes out of the box:
-  // aura, ayu, catppuccin-mocha, dracula, gruvbox-dark, nord,
-  // one-dark, everforest-light...
-  //
-  // Full list at:
-  // https://github.com/emilien-jegou/oyui/tree/main/docs/themes.md
-  // theme::set("everforest-dark");
+    // Oyui comes with 40+ built-in themes out of the box:
+    // aura, ayu, catppuccin-mocha, dracula, gruvbox-dark, nord,
+    // one-dark, everforest-light...
+    //
+    // Full list at:
+    // https://github.com/emilien-jegou/oyui/tree/main/docs/themes.md
+    // theme::set("everforest-dark");
 
-  // Overwritting theme specific config.
+    // Overwritting theme specific config.
 
-  // 50+ actions and settings to configure, check the documentation:
-  // https://github.com/emilien-jegou/oyui/wiki/Actions-API
-  // theme::bg::set("#1d2428")
-  // theme::file_staged_highlight::set(LineHighlightMode::Gradient(0.05));
+    // 50+ actions and settings to configure, check the documentation:
+    // https://github.com/emilien-jegou/oyui/wiki/Actions-API
+    // theme::bg::set("#1d2428")
+    // theme::file_staged_highlight::set(LineHighlightMode::Gradient(0.05));
 
-  // You can nest config per view with on_mode:
-  on_mode("file", || {
-    // keybind can take modifiers: "ctrl", "shift" or "alt"
-    keybind("ctrl-j", || view::file::cursor::down(5));
-    keybind("ctrl-k", || view::file::cursor::up(5));
-  });
+    // You can nest config per view with on_mode:
+    on_mode(
+        "file",
+        || {
+            // keybind can take modifiers: "ctrl", "shift" or "alt"
+            keybind("ctrl-j", || view::file::cursor::down(5));
+            keybind("ctrl-k", || view::file::cursor::up(5));
+        },
+    );
 
-  on_mode("tree", || {
-    keybind("ctrl-j", || view::tree::cursor::down(5));
-    keybind("ctrl-k", || view::tree::cursor::up(5));
-  });
+    on_mode(
+        "tree",
+        || {
+            keybind("ctrl-j", || view::tree::cursor::down(5));
+            keybind("ctrl-k", || view::tree::cursor::up(5));
+        },
+    );
 }
diff --git a/.config/nvim/plugin/nvim-lspconfig.lua b/.config/nvim/plugin/nvim-lspconfig.lua
--- a/.config/nvim/plugin/nvim-lspconfig.lua
+++ b/.config/nvim/plugin/nvim-lspconfig.lua
@@ -131,3 +131,11 @@
   filetypes = { "erlang" },
 }
 vim.lsp.enable("elp")
+
+-- rust / rune
+vim.lsp.config["oyui_ls"] = {
+  cmd = { "oyui", "language-server" },
+  filetypes = { "rune" },
+  root_markers = { "config.rn" },
+}
+vim.lsp.enable("oyui_ls")
diff --git a/.config/nvim/plugin/nvim-treesitter.lua b/.config/nvim/plugin/nvim-treesitter.lua
--- a/.config/nvim/plugin/nvim-treesitter.lua
+++ b/.config/nvim/plugin/nvim-treesitter.lua
@@ -37,6 +37,7 @@
 vim.wo[0][0].foldmethod = "expr"
 
 vim.treesitter.language.register("markdown", "djot")
+vim.treesitter.language.register("rust", "rune")
 
 vim.api.nvim_create_autocmd("FileType", {
   pattern = "*",