neovim: copilot in cmp

packages/vim/default.nix

@@ -14,7 +14,19 @@ neovim.override {
   configure = {
     vimAlias = true;
     viAlias = true;
-    customRC = ''
+    customRC =
+
+      lib.optionalString withCopilot (''
+        luafile ${writeText "copilot.lua" ''
+          require("copilot").setup({
+            suggestion = { enabled = false },
+            panel = { enabled = false }
+          })
+
+          require("copilot_cmp").setup()
+        ''}
+      '')
+      + ''
         source ${./shared.vim}
         source ${./init.vim}
         let g:snippet_directory = '${vimPlugins.friendly-snippets}'
@@ -81,7 +93,10 @@ neovim.override {
           }
         )
       ]
-      ++ lib.optional withCopilot vimPlugins.copilot-vim;
+      ++ lib.optionals withCopilot [
+        vimPlugins.copilot-lua
+        vimPlugins.copilot-cmp
+      ];
       opt = [
         csv
         dhall-vim

packages/vim/init.lua

@@ -19,17 +19,23 @@ cmp.setup({
       luasnip.lsp_expand(args.body)
     end,
   },
+  completion = {
+    autocomplete = { require("cmp.types").cmp.TriggerEvent.TextChanged },
+  },
   mapping = {
-    -- https://github.com/hrsh7th/nvim-cmp/wiki/Example-mappings#super-tab-like-mapping
+    ["<C-Space>"] = cmp.mapping.complete(),
+    ["<CR>"] = cmp.mapping.confirm({ select = true }),
+
     ["<Tab>"] = cmp.mapping(function(fallback)
       if cmp.visible() then
         cmp.select_next_item()
       elseif luasnip.expand_or_jumpable() then
         luasnip.expand_or_jump()
       else
-        fallback()
+        cmp.complete()
       end
     end, { "i", "s" }),
+
     ["<S-Tab>"] = cmp.mapping(function(fallback)
       if cmp.visible() then
         cmp.select_prev_item()
@@ -41,8 +47,11 @@ cmp.setup({
     end, { "i", "s" }),
   },
   sources = cmp.config.sources({
-    { name = "nvim_lsp" },
-    { name = "luasnip" },
+    { name = "copilot",  priority = 1000 },
+    { name = "nvim_lsp", priority = 800 },
+    { name = "luasnip",  priority = 700 },
+    { name = "path",     priority = 500 },
+    { name = "buffer",   priority = 300 },
   }),
 })