add cmp

config/programs/vim/modules/lsp/cmp.nix

@@ -0,0 +1,12 @@
+{pkgs, ...}: {
+  output.plugins = with pkgs.vimPlugins; [
+    nvim-cmp
+    cmp-cmdline
+    cmp-path
+    cmp-buffer
+    cmp-nvim-lsp
+    cmp_luasnip
+    cmp-git
+  ];
+  extraLuaModules = ["config.cmp"];
+}

config/programs/vim/modules/lua/config/cmp.lua

@@ -0,0 +1,58 @@
+-- Set up nvim-cmp.
+local cmp = require'cmp'
+
+cmp.setup({
+    snippet = {
+        -- REQUIRED - you must specify a snippet engine
+        expand = function(args)
+            require('luasnip').lsp_expand(args.body)
+        end,
+    },
+    window = {
+        -- completion = cmp.config.window.bordered(),
+        -- documentation = cmp.config.window.bordered(),
+    },
+    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.
+    }),
+    sources = cmp.config.sources({
+        { name = 'nvim_lsp' },
+        { name = 'vsnip' }, -- For vsnip users.
+        -- { name = 'luasnip' }, -- For luasnip users.
+        -- { name = 'ultisnips' }, -- For ultisnips users.
+        -- { name = 'snippy' }, -- For snippy users.
+    }, {
+        { name = 'buffer' },
+    })
+})
+
+-- Set configuration for specific filetype.
+cmp.setup.filetype('gitcommit', {
+    sources = cmp.config.sources({
+        { name = 'cmp_git' }, -- You can specify the `cmp_git` source if you were installed it.
+    }, {
+        { name = 'buffer' },
+    })
+})
+
+-- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
+cmp.setup.cmdline({ '/', '?' }, {
+    mapping = cmp.mapping.preset.cmdline(),
+    sources = {
+        { name = 'buffer' }
+    }
+})
+
+-- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
+cmp.setup.cmdline(':', {
+    mapping = cmp.mapping.preset.cmdline(),
+    sources = cmp.config.sources({
+        { name = 'path' }
+    }, {
+        { name = 'cmdline' }
+    })
+})