From a1fbdf49fdc97b615030bde532bff19632c49403 Mon Sep 17 00:00:00 2001
From: Venkatesan Ravi <venkyrocker7777@gmail.com>
Date: Sat, 5 Apr 2025 01:32:58 +0000
Subject: [PATCH] lsp: add inlayHints support

---
 docs/release-notes/rl-0.8.md   |  1 +
 modules/plugins/lsp/config.nix | 20 ++++++++++++++++++++
 modules/plugins/lsp/module.nix |  3 +++
 3 files changed, 24 insertions(+)

diff --git a/docs/release-notes/rl-0.8.md b/docs/release-notes/rl-0.8.md
index a245b006..8b87ae99 100644
--- a/docs/release-notes/rl-0.8.md
+++ b/docs/release-notes/rl-0.8.md
@@ -300,6 +300,7 @@
 - Add neo-tree integration for Bufferline.
 - Add more applicable filetypes to illuminate denylist.
 - Disable mini.indentscope for applicable filetypes.
+- Enable inlay hints support - `config.vim.lsp.inlayHints`.
 
 [tebuevd](https://github.com/tebuevd):
 
diff --git a/modules/plugins/lsp/config.nix b/modules/plugins/lsp/config.nix
index 0fa16e47..3702ac5f 100644
--- a/modules/plugins/lsp/config.nix
+++ b/modules/plugins/lsp/config.nix
@@ -4,6 +4,7 @@
   pkgs,
   ...
 }: let
+  inherit (lib.generators) mkLuaInline;
   inherit (lib.modules) mkIf;
   inherit (lib.strings) optionalString;
   inherit (lib.trivial) boolToString;
@@ -28,6 +29,25 @@ in {
         sourcePlugins = ["cmp-nvim-lsp"];
       };
 
+      autocmds =
+        if cfg.inlayHints.enable
+        then [
+          {
+            callback = mkLuaInline ''
+              function(event)
+                local bufnr = event.buf
+                local client = vim.lsp.get_client_by_id(event.data.client_id)
+                if client and client.supports_method(vim.lsp.protocol.Methods.textDocument_inlayHint) then
+                  vim.lsp.inlay_hint.enable(not vim.lsp.inlay_hint.is_enabled({ bufnr = bufnr }), { bufnr = bufnr })
+                end
+              end
+            '';
+            desc = "LSP on-attach enable inlay hints autocmd";
+            event = ["LspAttach"];
+          }
+        ]
+        else [];
+
       pluginRC.lsp-setup = ''
         vim.g.formatsave = ${boolToString cfg.formatOnSave};
 
diff --git a/modules/plugins/lsp/module.nix b/modules/plugins/lsp/module.nix
index b16f9c13..f408d873 100644
--- a/modules/plugins/lsp/module.nix
+++ b/modules/plugins/lsp/module.nix
@@ -5,6 +5,9 @@ in {
   options.vim.lsp = {
     enable = mkEnableOption "LSP, also enabled automatically through null-ls and lspconfig options";
     formatOnSave = mkEnableOption "format on save";
+    inlayHints = {
+      enable = mkEnableOption "inlay hints";
+    };
     mappings = {
       goToDefinition =
         mkMappingOption "Go to definition"