Migrate configuration to nixvim

config/plugins/cmp/cmp.nix

@@ -0,0 +1,38 @@
+{ ... }:
+
+{
+  # Autocompletion plugin
+  plugins.cmp = {
+    enable = true;
+    # Options provided to the require('cmp').setup function.
+    settings = {
+      # The sources to use
+      sources = [
+        { name = "nvim_lsp"; }  # LSP source for cmp
+        { name = "luasnip"; }   # Snippets source for cmp
+      ];
+      # The snippet expansion function.
+      snippet.expand = ''
+        function(args)
+          require('luasnip').lsp_expand(args.body)
+        end
+      '';
+      # cmp mappings declaration
+      mapping = {
+        # Select next/previous item.
+        "<C-e>" = "cmp.mapping.select_next_item()";
+        "<C-o>" = "cmp.mapping.select_prev_item()";
+        # Scroll through documentation.
+        "<C-s>" = "cmp.mapping.scroll_docs(-4)";
+        "<C-t>" = "cmp.mapping.scroll_docs(4)";
+        # Confirm selection.
+        "<C-CR>" = "cmp.mapping.confirm({ behavior = cmp.ConfirmBehavior.Replace, select = true })";
+        # Exit completion.
+        "<C-Esc>" = "cmp.mapping.abort()";
+      };
+    };
+    # Scans the sources array and enable the corresponding plugins if they are known to nixvim.
+    autoEnableSources = true;
+  };
+}
+