add luasnip config

config/programs/vim/modules/languages/luasnip.nix

@@ -0,0 +1,10 @@
+{pkgs, ...}: {
+  output.plugins = with pkgs.vimPlugins; [
+    luasnip
+  ];
+  output.extraConfig = ''
+    lua require('luasnip-config')
+    require("luasnip.loaders.from_vscode").lazy_load()
+    require("luasnip.loaders.from_vscode").lazy_load({ paths = '${./snippets}' })
+  '';
+}

config/programs/vim/modules/languages/nvim-cmp.nix

@@ -3,14 +3,19 @@
     nvim-cmp
 
     # Various sources
-    cmp-path
+    cmp_luasnip
     cmp-buffer
     cmp-calc
+    cmp-spell
+    cmp-path
+
     cmp-nvim-lua
     cmp-nvim-lsp
     cmp-latex-symbols
   ];
 
+  outputs.extraConfig = "lua require('cmp-config')";
+
   plugin.setup.cmp = {
     # TODO: maybe do non-default keybindings?
     # See :help cmp-mapping

config/programs/vim/modules/lua/cmp-config.lua

@@ -0,0 +1,26 @@
+local cmp = require("cmp")
+
+cmp.setup({
+  snippet = {
+    expand = function(args)
+      require('luasnip').lsp_expand(args.body)
+    end,
+  },
+  mapping = cmp.mapping.preset.insert({
+    ['<C-b>'] = cmp.mapping.scroll_docs(-4),
+    ['<C-f>'] = cmp.mapping.scroll_docs(4),
+    ['<C-Space>'] = cmp.mapping.complete(),
+    ['<C-e>'] = cmp.mapping.abort(),
+    ['<CR>'] = cmp.mapping.confirm({ select = true }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
+  }),
+  sources = cmp.config.sources({
+    { name = "nvim_lsp" },
+    { name = "luasnip" },
+    { name = "buffer" },
+    { name = "calc" },
+    { name = "spell" },
+    { name = "path" },
+    { name = "nvim_lua" },
+    { name = "latex-symbols" }
+  })
+})

config/programs/vim/modules/lua/luasnip-config.lua

@@ -0,0 +1,25 @@
+local ls = require('luasnip')
+local s = ls.snippet
+local i = ls.insert_node
+local t = ls.text_node
+local c = ls.choice_node
+local sn = ls.snippet_node
+local isn = ls.indent_snippet_node
+local fmt = require('luasnip.extras.fmt').fmt
+local types = require("luasnip.util.types")
+
+ls.config.setup({
+	ext_opts = {
+		[types.choiceNode] = {
+			active = {
+				virt_text = {{"●", "GruvboxOrange"}}
+			}
+		},
+		[types.insertNode] = {
+			active = {
+				virt_text = {{"●", "GruvboxBlue"}}
+			}
+		}
+	},
+})
+