chore: import nixos files

neovim/nvim-cmp.lua

@@ -0,0 +1,87 @@
+local has_words_before = function()
+    local line, col = unpack(vim.api.nvim_win_get_cursor(0))
+    return col ~= 0 and
+        vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(
+            col, col):match("%s") == nil
+end
+
+local cmp = require("cmp")
+local luasnip = require("luasnip")
+
+cmp.setup({
+    snippet = {
+        expand = function(args)
+            luasnip.lsp_expand(args.body)
+        end
+    },
+    sources = cmp.config.sources({
+        { name = "nvim_lsp" },
+        { name = "nvim_lsp_signature_help" },
+        { name = "luasnip" },
+        { name = "path" },
+        { name = "buffer" },
+        { name = "nvim-lua" },
+        { name = "calc" },
+    }),
+    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.
+        ["<Tab>"] = cmp.mapping(function(fallback)
+            if cmp.visible() then
+                cmp.select_next_item()
+            elseif luasnip.expand_or_jumpable() then
+                luasnip.expand_or_jump()
+            elseif has_words_before() then
+                cmp.complete()
+            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" }),
+    }),
+    experimental = { ghost_text = true },
+    window = {
+        completion = cmp.config.window.bordered(),
+        documentation = cmp.config.window.bordered(),
+    },
+    formatting = {
+        fields = { "menu", "abbr", "kind" },
+        format = function(entry, item)
+            local menu_icon = {
+                nvim_lsp = "λ",
+                luasnip = "⋗",
+                buffer = "Ω",
+                path = "🖿",
+            }
+
+            item.menu = menu_icon[entry.source.name]
+            return item
+        end,
+    },
+})
+
+-- `/` cmdline setup.
+cmp.setup.cmdline("/", {
+    sources = cmp.config.sources(
+        { name = "buffer" }
+    )
+})
+
+-- `:` cmdline setup.
+cmp.setup.cmdline(":", {
+    sources = cmp.config.sources(
+        { name = "path" },
+        { name = "cmdline" }
+    )
+})