refactor: Don't bind keys in global buffer

Bind only when LSP is loaded in buffer.
Remove unneeded plugins.
general cleanup

lua/keys.lua

@@ -7,16 +7,5 @@ vim.cmd([[autocmd BufNewFile,BufRead *.md setlocal filetype=notes]])
 key('n', ';', ':Files<CR>', {})
 key('', '<C-n>', ':NERDTreeToggle<CR>', {})
 
--- LSP Key Config
-local silent_opts = {silent = true}
-key('n', '<c-]>', ':lua vim.lsp.buf.definition()<CR>',       silent_opts)
-key('n', 'K',     ':lua vim.lsp.buf.hover()<CR>',            silent_opts)
-key('n', 'gD',    ':lua vim.lsp.buf.implementation()<CR>',   silent_opts)
-key('n', '<c-k>', ':lua vim.lsp.buf.signature_help()<CR>',   silent_opts)
-key('n', '1gD',   ':lua vim.lsp.buf.type_definition()<CR>',  silent_opts)
-key('n', 'gr',    ':lua vim.lsp.buf.references()<CR>',       silent_opts)
-key('n', 'g0',    ':lua vim.lsp.buf.document_symbol()<CR>',  silent_opts)
-key('n', 'gW',    ':lua vim.lsp.buf.workspace_symbol()<CR>', silent_opts)
-key('n', 'gd',    ':lua vim.lsp.buf.definition()<CR>',       silent_opts)
-key('n', 'ga',    ':lua vim.lsp.buf.code_action()<CR>',      silent_opts)
-key('n', 'ff',    ':lua vim.lsp.buf.formatting()<CR>',       silent_opts)
+key('i', '<TAB>', 'pumvisible() ? "<C-n>" : "<Tab>"', {expr = true, silent = true})
+key('i', '<S-TAB>', 'pumvisible() ? "<C-p>" : "<S-Tab>"', {expr = true, silent = true})

lua/lsp.lua

@@ -1,69 +1,58 @@
+require'lspinstall'.setup()
+local u = require('utils')
 local nvim_lsp = require'lspconfig'
 
-local function setup_servers()
-  require'lspinstall'.setup()
-  local servers = require'lspinstall'.installed_servers()
-  for _, lsp in pairs(servers) do
-    nvim_lsp[lsp].setup{}
+local on_attach = function(client, bufnr)
+  local function buf_set_keymap(...) vim.api.nvim_buf_set_keymap(bufnr, ...) end
+  local function buf_set_option(...) vim.api.nvim_buf_set_option(bufnr, ...) end
+
+  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')
+
+  local opts = { noremap=true, silent=true }
+
+  buf_set_keymap('n', '<c-]>', ':lua vim.lsp.buf.definition()<CR>',       opts)
+  buf_set_keymap('n', 'K',     ':lua vim.lsp.buf.hover()<CR>',            opts)
+  buf_set_keymap('n', 'gD',    ':lua vim.lsp.buf.implementation()<CR>',   opts)
+  buf_set_keymap('n', '<c-k>', ':lua vim.lsp.buf.signature_help()<CR>',   opts)
+  buf_set_keymap('n', '1gD',   ':lua vim.lsp.buf.type_definition()<CR>',  opts)
+  buf_set_keymap('n', 'gr',    ':lua vim.lsp.buf.references()<CR>',       opts)
+  buf_set_keymap('n', 'g0',    ':lua vim.lsp.buf.document_symbol()<CR>',  opts)
+  buf_set_keymap('n', 'gW',    ':lua vim.lsp.buf.workspace_symbol()<CR>', opts)
+  buf_set_keymap('n', 'gd',    ':lua vim.lsp.buf.definition()<CR>',       opts)
+  buf_set_keymap('n', 'ga',    ':lua vim.lsp.buf.code_action()<CR>',      opts)
+  buf_set_keymap('n', 'ff',    ':lua vim.lsp.buf.formatting()<CR>',       opts)
+
+  require'completion'.on_attach(client)
+
+  -- Set highlight colors
+  local highlights = {
+    Error = "Red",
+    Warning = "Yellow",
+    Information = "Blue",
+    Hint = "Green",
+  }
+
+  for typ, color in pairs(highlights) do
+    u.hi('LspDiagnosticsDefault'..typ, {ctermfg = color})
+    u.hi('LspDiagnosticsUnderline'..typ, {cterm = 'underline'})
   end
+
+  vim.lsp.handlers['textDocument/publishDiagnostics'] = vim.lsp.with(
+    vim.lsp.diagnostic.on_publish_diagnostics,
+    {
+      virtual_text = true,
+      signs = true,
+      update_in_insert = true,
+      underline = true
+    }
+  )
 end
 
-local opts = {
-    tools = {
-        autoSetHints = true,
-        hover_with_actions = true,
-        runnables = {
-            use_telescope = true
-        },
-        inlay_hints = {
-            show_parameter_hints = false,
-            parameter_hints_prefix = "",
-            other_hints_prefix = "",
-        },
-    },
-
-    -- all the opts to send to nvim-lspconfig
-    -- these override the defaults set by rust-tools.nvim
-    -- see https://github.com/neovim/nvim-lspconfig/blob/master/CONFIG.md#rust_analyzer
-    server = {}, -- rust-analyer options
-}
-
-require('rust-tools').setup(opts)
-
-setup_servers()
-
-require'lspinstall'.post_install_hook = function ()
-  setup_servers()
-  vim.cmd("bufdo e")
+local servers = require'lspinstall'.installed_servers()
+for _, lsp in ipairs(servers) do
+  nvim_lsp[lsp].setup{
+    on_attach = on_attach,
+    flags = {debounce_text_changes = 150}
+  }
 end
 
-local cmp = require'cmp'
-cmp.setup({
-  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(),
-    ['<S-Tab>'] = cmp.mapping.select_prev_item(),
-    ['<Tab>'] = cmp.mapping.select_next_item(),
-    ['<C-d>'] = 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 = 'nvim_lsp' },
-    { name = 'vsnip' },
-    { name = 'path' },
-    { name = 'buffer' },
-  },
-})

lua/plugins.lua

@@ -1,6 +1,8 @@
+local vim = vim -- Workaround to get rid of warnings
 vim.cmd([[autocmd BufWritePost plugins.lua source <afile> | PackerCompile]])
 
 return require('packer').startup({function()
+  local use = use
   -- Packer can manage itself
   use 'wbthomason/packer.nvim'
 
@@ -8,7 +10,6 @@ return require('packer').startup({function()
   use 'scrooloose/nerdtree'
   use 'Xuyuanp/nerdtree-git-plugin'
   use 'liuchengxu/space-vim-dark'
-  
   use 'tpope/vim-fugitive'
   use 'tpope/vim-commentary'
   use { 'tpope/vim-dispatch', opt = true, cmd = { 'Dispatch', 'Dispatch!' } }
@@ -19,8 +20,6 @@ return require('packer').startup({function()
   use 'rodjek/vim-puppet'
   use 'tpope/vim-rails'
   use 'tpope/vim-haml'
-  use 'vim-scripts/bash-support.vim'
-  use "akinsho/nvim-toggleterm.lua"
   use 'xolox/vim-notes'
   use 'xolox/vim-misc'
   use 'jremmen/vim-ripgrep'
@@ -28,15 +27,10 @@ return require('packer').startup({function()
   -- LSP Setup
   use 'neovim/nvim-lspconfig'
   use 'kabouzeid/nvim-lspinstall'
-  use 'hrsh7th/nvim-cmp'
-  use 'hrsh7th/cmp-nvim-lsp'
-  use 'hrsh7th/cmp-vsnip'
-  use 'hrsh7th/cmp-path'
-  use 'hrsh7th/cmp-buffer'
-  use 'simrat39/rust-tools.nvim'
+  use 'nvim-lua/lsp_extensions.nvim'
+  use 'nvim-lua/completion-nvim'
   use 'nvim-lua/popup.nvim'
   use 'nvim-lua/plenary.nvim'
-  use 'nvim-telescope/telescope.nvim'
 end,
 config = {
   display = {

lua/settings.lua

@@ -1,9 +1,13 @@
 local o = vim.o
 local wo = vim.wo
 local bo = vim.bo
+local cmd = vim.cmd
+
+cmd('syntax on')
+cmd('set number')
+cmd('set completeopt=menuone,noinsert,noselect')
+cmd('set shortmess+=c')
 
-vim.cmd('syntax on')
-vim.cmd('set number')
 o.startofline = true
 wo.cursorline = true
 
@@ -11,7 +15,6 @@ o.updatetime = 300
 wo.signcolumn='yes'
 o.showcmd = true
 
-
 o.shell = 'bash'
 o.mouse = 'a'
 
@@ -22,5 +25,3 @@ bo.expandtab = true
 
 wo.relativenumber = true
 
-vim.cmd('set completeopt=menuone,noinsert,noselect')
-vim.cmd('set shortmess+=c')

lua/utils.lua

@@ -9,6 +9,14 @@ function M.create_augroup(autocmds, name)
     vim.cmd('augroup END')
 end
 
+function M.hi(name, opts)
+    local options = ""
+    for k, v in pairs(opts) do
+        options = options.." "..k.."="..v
+    end
+    vim.cmd("highlight "..name..options)
+end
+
 function M.create_function(body, name)
     vim.cmd('function! ' .. name)
     for _, line in ipairs(body) do