Add copilot plugins

Finally accepting our new robot overlords.

lua/install-plugins.lua

@@ -325,6 +325,20 @@ return require('packer').startup(function(use)
       require('plugins.typescript-nvim')
     end,
   }
+  use {
+    'zbirenbaum/copilot.lua',
+    cmd = 'Copilot',
+    event = 'InsertEnter',
+    config = function()
+      require('plugins.copilot')
+    end,
+  }
+  use {
+    'zbirenbaum/copilot-cmp',
+    config = function ()
+      require('copilot_cmp').setup()
+    end
+  }
   use 'ziglang/zig.vim'
   use {
     'akinsho/bufferline.nvim',

lua/plugins/copilot.lua

@@ -0,0 +1,4 @@
+require('copilot').setup({
+	suggestion = { enabled = false },
+	panel = { enabled = false },
+});

lua/plugins/nvim-cmp.lua

@@ -1,6 +1,12 @@
 local cmp = require('cmp')
 local lspkind = require('lspkind')
 
+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({
   experimental = { ghost_text = true },
   snippet = {
@@ -23,8 +29,8 @@ cmp.setup({
     ['<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()
+      if cmp.visible() and has_words_before() then
+        cmp.select_next_item({ behavior = cmp.SelectBehavior.Select })
       else
         fallback()
       end
@@ -48,6 +54,7 @@ cmp.setup({
       priority = 100,
       group_index = 1,
     },
+    { name = "copilot", group_index = 2 },
     {
       name = 'buffer',
       priority = 80,
@@ -64,8 +71,21 @@ cmp.setup({
     -- { name = 'snippy' }, -- For snippy users.
   }),
   sorting = {
+    priority_weight = 2,
     comparators = {
-      function(...) return require('cmp_buffer'):compare_locality(...) end,
+      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,function(...) return require('cmp_buffer'):compare_locality(...) end,
     }
   },
   formatting = {
@@ -73,6 +93,7 @@ cmp.setup({
       mode = 'symbol_text',
       maxwidth = 50,
       ellipsis_char = '…',
+      symbol_map = { Copilot = '🤖' },
     })
   }
 })