fix nvim snippets

home/neovim/default.nix

@@ -30,6 +30,8 @@
         cmp-nvim-lsp
         friendly-snippets
         neodev-nvim
+        luasnip
+        cmp_luasnip
       ];
     };
 

home/neovim/neovim.lua

@@ -91,11 +91,18 @@ require("gitsigns").setup()
 
 --[ CMP ]--
 
--- For snippets: look at https://github.com/vimjoyer/nvim-nix-video/blob/main/nvim/plugin/cmp.lua
-
 local cmp = require('cmp')
+local luasnip = require('luasnip')
+
+require('luasnip.loaders.from_vscode').lazy_load()
+luasnip.config.setup {}
 
 cmp.setup {
+    snippet = {
+        expand = function(args)
+            luasnip.lsp_expand(args.body)
+        end,
+    },
     mapping = cmp.mapping.preset.insert {
         ['<C-n>'] = cmp.mapping.select_next_item(),
         ['<C-p>'] = cmp.mapping.select_prev_item(),
@@ -109,6 +116,8 @@ cmp.setup {
         ['<Tab>'] = cmp.mapping(function(fallback)
             if cmp.visible() then
                 cmp.select_next_item()
+            elseif luasnip.expand_or_locally_jumpable() then
+                luasnip.expand_or_jump()
             else
                 fallback()
             end
@@ -116,6 +125,8 @@ cmp.setup {
         ['<S-Tab>'] = cmp.mapping(function(fallback)
             if cmp.visible() then
                 cmp.select_prev_item()
+            elseif luasnip.locally_jumpable(-1) then
+                luasnip.jump(-1)
             else
                 fallback()
             end
@@ -123,5 +134,6 @@ cmp.setup {
     },
     sources = {
         { name = 'nvim_lsp' },
+        { name = 'luasnip' },
     },
 }