copilot-cmp

This repository transforms https://github.com/zbirenbaum/copilot.lua into a cmp source.

Copilot suggestions will automatically be loaded into your cmp menu as snippets and display their full contents when a copilot suggestion is hovered.

Setup

If you already have copilot.lua installed, you can install this plugin with packer as you would any other with the following code:

Install

use {
  "zbirenbaum/copilot-cmp",
  module = "copilot_cmp",
},

If you do not have copilot.lua installed, go to https://github.com/zbirenbaum/copilot.lua and follow the instructions there before installing this one

Configuration

Source Definition

To link cmp with this source, simply go into your cmp configuration file and include { name = "copilot" } under your sources

Here is an example of what it should look like:

cmp.setup {
  ...
  sources = {
    -- Copilot Source
    { name = "copilot", group_index = 2 },
    -- Other Sources
    { name = "nvim_lsp", group_index = 2 },
    { name = "path", group_index = 2 },
    { name = "luasnip", group_index = 2 },
  },
  ...
}

Highlighting & Icon

Copilot's cmp source now has a builtin highlight group CmpItemKindCopilot. To add an icon to copilot for lspkind, simply add copilot to your lspkind symbol map.

-- lspkind.lua
local lspkind = require("lspkind")
lspkind.init({
  symbol_map = {
    Copilot = "",
  },
},

vim.api.nvim_set_hl(0, "CmpItemKindCopilot", {fg ="#6CC644"})

Alternatively, you can add Copilot to the lspkind symbol_map within the cmp format function.

-- cmp.lua
cmp.setup {
  ...
  formatting = {
    format = lspkind.cmp_format({
      mode = "symbol",
      max_width = 50,
      symbol_map = { Copilot = "" }
    })
  }
  ...
}

If you do not use lspkind, simply add the custom icon however you normally handle kind formatting and it will integrate as if it was any other normal lsp completion kind.

Tab Completion Configuration (Highly Recommended)

Unlike other completion sources, copilot can use other lines above or below an empty line to provide a completion. This can cause problematic for individuals that select menu entries with <TAB>. This behavior is configurable via cmp's config and the following code will make it so that the menu still appears normally, but tab will fallback to indenting unless a non-whitespace character has actually been typed.

local has_words_before = function()
  if vim.api.nvim_buf_get_option(0, "buftype") == "prompt" then return false end
  local line, col = unpack(vim.api.nvim_win_get_cursor(0))
  return col ~= 0 and vim.api.nvim_buf_get_text(0, line-1, 0, line-1, col, {})[1]:match("^%s*$") == nil
end
cmp.setup({
  mapping = {
    ["<Tab>"] = vim.schedule_wrap(function(fallback)
      if cmp.visible() and has_words_before() then
        cmp.select_next_item({ behavior = cmp.SelectBehavior.Select })
      else
        fallback()
      end
    end),
  },
})

Comparators

Two customs comparitors for sorting cmp entries are provided: score and prioritize. The prioritize comparitor causes copilot entries to appearhigher in the cmp menu. The score comparitor only does something if getPanelCompletions is the method used in the cmp field of the copilot.lua config. It is recommended keeping priority weight at 2, or placing the exact comparitor above copilot so that better lsp matches are not stuck below poor copilot matches.

Example:

cmp.setup {
  ...
  sorting = {
    priority_weight = 2,
    comparators = {
      require("copilot_cmp.comparators").prioritize,
      require("copilot_cmp.comparators").score,

      -- Below is the default comparitor list and order for nvim-cmp
      cmp.config.compare.offset,
      -- cmp.config.compare.scopes, --this is commented in nvim-cmp too
      cmp.config.compare.exact,
      cmp.config.compare.score,
      cmp.config.compare.recently_used,
      cmp.config.compare.locality,
      cmp.config.compare.kind,
      cmp.config.compare.sort_text,
      cmp.config.compare.length,
      cmp.config.compare.order,
    },
  },
  ...
}