Set up completion/LSP properly

users/tsv/home.nix

@@ -74,22 +74,27 @@
   programs.neovim = {
     enable = true;
     plugins = with pkgs.vimPlugins; [
-      telescope-nvim
-      gruvbox-nvim
-      nvim-treesitter.withAllGrammars
-      nvim-web-devicons
-      nvim-tree-lua
-      vim-fugitive
-      git-messenger-vim
-      nvim-lspconfig
-      nvim-cmp
-      cmp-treesitter
-      cmp-path
       cmp-nvim-lsp
-      cmp-buffer
-      hologram-nvim
+      cmp-path
+      cmp-treesitter
+      cmp-vsnip
+      friendly-snippets # Collection of predefined snippets
+      fugitive-gitlab-vim
+      git-messenger-vim
+      gruvbox-nvim
+      hologram-nvim # For images inside kitty
+      nvim-cmp
       nvim-dap
       nvim-dap-ui
+      nvim-lspconfig
+      nvim-treesitter.withAllGrammars
+      nvim-tree-lua
+      nvim-web-devicons
+      telescope-nvim
+      vim-fugitive
+      vim-rhubarb # GitHub support for fugitive
+      vim-vsnip
+      vim-vsnip-integ
       vimwiki
     ];
   };

users/tsv/nvim/init.lua

@@ -17,6 +17,9 @@ require("gruvbox").setup({
 })
 vim.cmd([[colorscheme gruvbox]])
 
+-- Git
+vim.g.fugitive_gitlab_domains = {'https://git.foxsoft.co.uk'}
+
 -- Strip trailing spaces
 vim.api.nvim_create_autocmd({"BufWritePre"}, {
   pattern = { "*" },
@@ -42,11 +45,32 @@ require'nvim-treesitter.configs'.setup {
 }
 
 -- Completion and LSP
-require'cmp'.setup {
-  sources = {
-    { name = 'nvim_lsp' }
-  }
+local cmp = require'cmp'
+cmp.setup {
+  snippet = {
+    expand = function(args)
+      vim.fn["vsnip#anonymous"](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 }),
+  }),
+  sources = cmp.config.sources({
+    { name = 'nvim_lsp' },
+    { name = 'vsnip' },
+    { name = 'path' },
+    { name = 'treesitter' },
+  })
 }
+local capabilities = require('cmp_nvim_lsp').default_capabilities()
 require'lspconfig'.solargraph.setup {}
 
 -- Vimwiki