Totally upgrade the LSP experience

README.md

@@ -99,11 +99,14 @@ To move seamlessly between splits.
 
 ### Autocompletion
 
-Autocompletion is provided by [asyncomplete.vim](https://github.com/prabirshrestha/asyncomplete.vim). Additionally
-LSP-based autocompletion is installed.
+Autocomplete is provided by [nvim-cmp](https://github.com/hrsh7th/nvim-cmp).
 
-Automatic popups are disabled. In order to see suggestions begin typing and then hit `<C-Space>` in insert mode.
-Once in the popup you can use `<Tab>` and `<S-Tab>` to go up and down the suggestions.
+Important commands:
+
+* `<TAB>`: Will attempt to autocomplete your current line.
+* `<C-Space>`: Will provide documentation and other details.
+
+This is, of course, depending entirely on which LSP you have installed.
 
 ### Default Leader
 

lua/conf/langs/completion.lua

@@ -0,0 +1,54 @@
+-- Credit to https://rsdlt.github.io/ for this code.
+
+local cmp = require'cmp'
+
+cmp.setup({
+  -- Enable LSP snippets
+  snippet = {
+    expand = function(args)
+        vim.fn["vsnip#anonymous"](args.body)
+    end,
+  },
+  mapping = {
+    ['<C-p>'] = cmp.mapping.select_prev_item(),
+    ['<C-n>'] = cmp.mapping.select_next_item(),
+    -- Add tab support
+    ['<S-Tab>'] = cmp.mapping.select_prev_item(),
+    ['<Tab>'] = cmp.mapping.select_next_item(),
+    ['<C-S-f>'] = cmp.mapping.scroll_docs(-4),
+    ['<C-f>'] = cmp.mapping.scroll_docs(4),
+    ['<C-Space>'] = cmp.mapping.complete(),
+    ['<C-e>'] = cmp.mapping.close(),
+    ['<CR>'] = cmp.mapping.confirm({
+      behavior = cmp.ConfirmBehavior.Insert,
+      select = true,
+    })
+  },
+  -- Installed sources:
+  sources = {
+    { name = 'path' },                              -- file paths
+    { name = 'nvim_lsp', keyword_length = 3 },      -- from language server
+    { name = 'nvim_lsp_signature_help'},            -- display function signatures with current parameter emphasized
+    { name = 'nvim_lua', keyword_length = 2},       -- complete neovim's Lua runtime API such vim.lsp.*
+    { name = 'buffer', keyword_length = 2 },        -- source current buffer
+    { name = 'vsnip', keyword_length = 2 },         -- nvim-cmp source for vim-vsnip
+    { name = 'calc'},                               -- source for math calculation
+  },
+  window = {
+      completion = cmp.config.window.bordered(),
+      documentation = cmp.config.window.bordered(),
+  },
+  formatting = {
+      fields = {'menu', 'abbr', 'kind'},
+      format = function(entry, item)
+          local menu_icon ={
+              nvim_lsp = 'λ',
+              vsnip = '⋗',
+              buffer = 'Ω',
+              path = '🖫',
+          }
+          item.menu = menu_icon[entry.source.name]
+          return item
+      end,
+  },
+})

lua/conf/langs/general.lua

@@ -31,6 +31,7 @@ require'nvim-treesitter.configs'.setup {
       "markdown",
       "python",
       "rust",
+      "toml",
       "query",
       "vim",
       "vimdoc",
@@ -55,4 +56,11 @@ require'nvim-treesitter.configs'.setup {
     -- Disable vim regex highlighting. May intefer with some `indent` style stuff.
     additional_vim_regex_highlighting = false,
   },
+  ident = {enable = true },
+  rainbow = {
+    enable = true,
+    extended_mode = true,
+    max_file_lines = nil,
+  }
+
 }

lua/conf/langs/rust.lua

@@ -0,0 +1,12 @@
+local rt = require("rust-tools")
+
+rt.setup({
+  server = {
+    on_attach = function(_, bufnr)
+      -- Hover actions
+      vim.keymap.set("n", "<C-space>", rt.hover_actions.hover_actions, { buffer = bufnr })
+      -- Code action groups
+      vim.keymap.set("n", "<Leader>a", rt.code_action_group.code_action_group, { buffer = bufnr })
+    end,
+  },
+})

lua/conf/plugins.lua

@@ -10,7 +10,7 @@ vim.cmd [[
 	if !(has('win16') || has('win32') || has('win64'))
 	  if empty(glob('~/.config/nvim/autoload/plug.vim'))
 	    silent !curl -fLo ~/.config/nvim/autoload/plug.vim --create-dirs
-	      \ https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim
+	      \ https://raw.githubPlugrcontent.com/junegunn/vim-plug/master/plug.vim
 	    autocmd VimEnter * PlugInstall | source %
 	  endif
 	endif
@@ -47,9 +47,15 @@ Plug('williamboman/mason.nvim', {['do'] = vim.fn[':MasonUpdate']})
 Plug('williamboman/mason-lspconfig.nvim')
 Plug('neovim/nvim-lspconfig')
 
--- Autocomplete
-Plug 'prabirshrestha/asyncomplete.vim'
-Plug 'prabirshrestha/asyncomplete-lsp.vim'
+-- Completion framework
+Plug 'hrsh7th/nvim-cmp'
+Plug 'hrsh7th/cmp-nvim-lsp'
+Plug 'hrsh7th/cmp-nvim-lua'
+Plug 'hrsh7th/cmp-nvim-lsp-signature-help'
+Plug 'hrsh7th/cmp-vsnip'
+Plug 'hrsh7th/cmp-path'
+Plug 'hrsh7th/cmp-buffer'
+Plug 'hrsh7th/vim-vsnip'
 
 -- Tmux Helper
 Plug 'preservim/vimux'
@@ -78,4 +84,7 @@ if vim.fn.executable('pyenv') == 1 then
   Plug 'lambdalisue/vim-pyenv'
 end
 
+-- Rust
+Plug 'simrat39/rust-tools.nvim'
+
 vim.call('plug#end')

lua/conf/ui.lua

@@ -9,11 +9,6 @@ vim.cmd [[colorscheme nord]]
 -- Always show hidden files in nerdtree
 vim.g.NERDTreeShowHidden = 1
 
--- Disable auto-popup for autocomplete
--- This prevents autocomplete spamming when
--- you dont want it.
-vim.g.asyncomplete_auto_popup = 0
-
 require('telescope').setup{
   defaults = {},
   pickers = {
@@ -23,6 +18,3 @@ require('telescope').setup{
   },
   extensions = {}
 }
-
-
-