refactor(nvim): move plugin config to the

... `after/plugin` directory

roles/neovim/files/after/plugin/completion.lua

@@ -0,0 +1,63 @@
+local cmp_status_ok, cmp = pcall(require, "cmp")
+if not cmp_status_ok then
+  return
+end
+
+local snip_status_ok, luasnip = pcall(require, "luasnip")
+if not snip_status_ok then
+  return
+end
+
+require("luasnip/loaders/from_vscode").lazy_load()
+
+cmp.setup {
+  snippet = {
+    expand = function(args)
+      luasnip.lsp_expand(args.body)
+    end,
+  },
+
+  mapping = {
+    ["<C-d>"] = cmp.mapping.scroll_docs(-4),
+    ["<C-f>"] = cmp.mapping.scroll_docs(4),
+    ["<C-e>"] = cmp.mapping.close(),
+    ["<c-y>"] = cmp.mapping.confirm {
+      behavior = cmp.ConfirmBehavior.Insert,
+      select = true,
+    },
+  },
+
+  sources = {
+    { name = "buffer", priority = 2, keyword_length = 5, max_item_count = 5 },
+    { name = "calc" },
+    { name = "path" },
+    { name = "spell" },
+    { name = "treesitter" },
+
+    -- Neovim
+    { name = "nvim_lsp", priority = 10 },
+    { name = "nvim_lua" },
+
+    -- Plugins
+    { name = "luasnip" },
+    { name = "cmp_tabnine" },
+  },
+
+  formatting = {
+    format = require("lspkind").cmp_format {
+      with_text = true,
+      menu = {
+        buffer = "[buf]",
+        cmp_tabnine = "[tn]",
+        luasnip = "[snip]",
+        nvim_lsp = "[lsp]",
+        nvim_lua = "[lua]",
+        path = "[path]",
+      },
+    },
+  },
+
+  experimental = {
+    ghost_text = true,
+  },
+}