add autocomplete

config/programs/vim/cmp.lua

@@ -0,0 +1,41 @@
+-- nvim-cmp setup
+
+local cmp = require("cmp")
+cmp.setup {
+    snippet = {
+	expand = function(args)
+	    luasnip.lsp_expand(args.body)
+	end
+    },
+    mapping = cmp.mapping.preset.insert({
+	['<C-d>'] = cmp.mapping.scroll_docs(-4),
+	['<C-f>'] = cmp.mapping.scroll_docs(4),
+	['<C-Space>'] = cmp.mapping.complete(),
+	['<CR>'] = cmp.mapping.confirm {
+	    behavior = cmp.ConfirmBehavior.Replace,
+	    select = true,
+	},
+	['<Tab>'] = cmp.mapping(function(fallback)
+	    if cmp.visible() then
+		cmp.select_next_item()
+	    elseif luasnip.expand_or_jumpable() then
+		luasnip.expand_or_jump()
+	    else
+		fallback()
+	    end
+	end, { 'i', 's' }),
+	['<S-Tab>'] = cmp.mapping(function(fallback)
+	    if cmp.visible() then
+		cmp.select_prev_item()
+	    elseif luasnip.jumpable(-1) then
+		luasnip.jump(-1)
+	    else
+		fallback()
+	    end
+	end, { 'i', 's' }),
+    }),
+    sources = {
+	{ name = 'nvim_lsp' },
+	{ name = 'luasnip' },
+    },
+}

config/programs/vim/default.nix

@@ -35,6 +35,13 @@ in {
       }
       copilot-vim
       rust-vim # for proper syntax highlighting
+      luasnip
+      cmp-nvim-lsp
+      cmp_luasnip
+      {
+        plugin = nvim-cmp;
+        config = "lua dofile(\"${./cmp.lua}\")";
+      }
       {
         plugin = nvim-lspconfig;
         config = "lua dofile(\"${./lsp.lua}\")";

config/programs/vim/lsp.lua

@@ -1,3 +1,7 @@
+-- Grab capabilties
+local capabilities = vim.lsp.protocol.make_client_capabilities()
+capabilities = require('cmp_nvim_lsp').update_capabilities(capabilities)
+
 -- Mappings.
 -- See `:help vim.diagnostic.*` for documentation on any of the below functions
 local opts = { noremap=true, silent=true }
@@ -41,6 +45,7 @@ for _, lsp in pairs(servers) do
         flags = {
             -- This will be the default in neovim 0.7+
             debounce_text_changes = 150,
-        }
+        },
+	capabilities = capabilities
     }
 end