feat(neovim): add lsp-signature-help completion source

home-manager/neovim/default.nix

@@ -1,5 +1,18 @@
 { config, lib, pkgs, user, ... }:
 
+let
+  cmp-nvim-lsp-signature-help = pkgs.vimUtils.buildVimPlugin {
+    name = "cmp-nvim-lsp-signature-help";
+    version = "2022-07-21";
+    src = pkgs.fetchFromGitHub {
+      owner = "hrsh7th";
+      repo = "cmp-nvim-lsp-signature-help";
+      rev = "57c4db7d3a663bd31ef60c4b5ed32683301247e9";
+      sha256 = "LKtMrxm9i+yoLYh1NuZsENSScB7MQZrjTFpD9wdpz1M=";
+    };
+    meta.homepage = "https://github.com/hrsh7th/cmp-nvim-lsp-signature-help";
+  };
+in
 {
   home.packages = with pkgs; [
     xclip
@@ -58,6 +71,7 @@
         cmp-nvim-lua
         cmp_luasnip
         cmp-calc
+        cmp-nvim-lsp-signature-help
 
         # telescope
         telescope-nvim

home-manager/neovim/nvim-cmp.lua

@@ -16,6 +16,7 @@ cmp.setup({
     },
     sources = cmp.config.sources({
         { name = "nvim_lsp" },
+        { name = "nvim_lsp_signature_help" },
         { name = "luasnip" },
         { name = "path" },
         { name = "buffer" },