How to Configure Google Gemini in Neovim

Configure your Neovim environment to leverage the power of Google’s Gemini models. This includes obtaining an API key, setting up the necessary plugin architecture using Lazy.nvim, and configuring the tool to assist with code generation, explanations, and refactoring directly within Neovim.

Why?

The primary advantage of bringing Gemini into Neovim is a massive increase in productivity. Instead of toggling between your browser and your terminal, you can query the AI for documentation, logic fixes, or boilerplate code without ever lifting your hands from the home row. By integrating Gemini, you gain a pair programmer that understands your current buffer’s context, helping you solve complex problems faster and reducing the cognitive load of syntax memorization.

Obtain your Gemini API Key

Before configuring the plugin, you need an API key from Google.

• Go to the Google AI Studio.
• Create a new project
• Create a new API key and add it to the project.
• Execute export GEMINI_API_KEY="your_api_key_here"
• Add the line export GEMINI_API_KEY="your_api_key_here" to .profile

Install (and configure) gemini.nvim with Lazy.nvim

We will use gemini.nvim and we will map gemini.nvim to keys that feel natural. The key mappings will only exist if the plugin is installed and loaded.

Add the following lua block to your ~/.config/nvim/lua/plugins/gemini.lua file:

return {
  'kiddos/gemini.nvim',

  opts = {
    model_config = {
      model_id = "gemini-1.5-flash",
      temperature = 0.7, -- Balance between precision and creativity
    },

    -- Disable to avoid annoying ghost text and to save API quota.
    hints = { enabled = false },
    completion = { enabled = false },

    -- Configure behavior
    instruction = {
      enabled = true,
      data = "You are a senior expert programmer in Python, Rust, .NET, and Standard C. Your responses must be brief, concise, and focused on technical excellence.",
    },

    chat_config = {
      enabled = true,
    },
  },

  config = function(_, opts)
    require("gemini").setup(opts)

    -- Keybindings
    vim.keymap.set("n", "<leader>gc", "<cmd>GeminiChat<cr>", { desc = "Gemini Chat" })
    vim.keymap.set("n", "<leader>gr", "<cmd>GeminiReview<cr>", { desc = "Gemini Code Review" })
    vim.keymap.set("v", "<leader>ge", "<cmd>GeminiExplain<cr>", { desc = "Gemini Explain Selection" })
    vim.keymap.set("v", "<leader>go", "<cmd>GeminiOptimize<cr>", { desc = "Gemini Optimize Selection" })
  end
}

You can view more configuration options in gemini.nvim’s README file

Install gemini.nvim

Open Neovim and run :Lazy, then press I

Restart Neovim

Restart Neovim to start using the commands.

Demos

Check out this demos from gemini.nvim’s README file

GeminiChat command

GeminiExplain command

GeminiCodeReview command

Thanks for reading! :)