add fundamental nvim and vim configs

dot_config/nvim/lua/options.lua

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+-- Visual
+vim.o.conceallevel = 0
+vim.o.cmdheight = 1
+vim.o.pumheight = 10
+vim.o.showmode = false
+vim.o.title = true
+vim.o.termguicolors = true
+vim.wo.number = true
+vim.wo.signcolumn = "yes"
+
+-- Behaviour
+vim.o.hlsearch = true
+vim.o.ignorecase = true
+vim.o.smartcase = true
+vim.o.smarttab = true
+vim.o.smartindent = true
+vim.o.expandtab = true
+vim.o.tabstop = 2
+vim.o.softtabstop = 2
+vim.o.shiftwidth = 2
+vim.o.splitbelow = true
+vim.o.splitright = true
+vim.o.scrolloff = 12
+vim.o.sidescrolloff = 8
+vim.o.mouse = "a"
+
+-- Vim specific
+vim.o.hidden = true
+vim.o.fileencoding = "utf-8"
+vim.o.spell = false
+vim.o.completeopt = "menuone,noinsert,noselect"
+vim.o.wildmode = "longest,full"
+vim.o.updatetime = 300
+
+-- Disable inline error messages
+vim.diagnostic.config {
+  virtual_text = false,
+  underline = false,
+  signs = true,
+}
+

dot_config/nvim/lua/plugins.lua

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+-- Plugin definitions and loading
+local cmd = vim.cmd
+
+-- Rerun packer install when this file changes
+cmd([[
+  augroup packer_user_config
+    autocmd!
+    autocmd BufWritePost plugins.lua source <afile> | PackerCompile
+  augroup end
+]])
+
+-- Load packer
+cmd([[packadd packer.nvim]])
+
+-- Get plugins
+return require("packer").startup(function(use)
+  -- Dogfood packer
+  use({"wbthomason/packer.nvim", opt = true})
+
+  -- LSP stuff
+  use({"neovim/nvim-lspconfig", config = function() require("plugins.lsp") end})
+end)

dot_config/nvim/lua/plugins/lsp.lua

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+-- LSP-related configuration
+local Utils = require("utils")
+local opts = {noremap = true, silent = true}
+
+-- Set some useful keybinds
+Utils.nmap("<space>e", "<cmd>lua vim.diagnostic.open_float()<CR>")
+Utils.nmap("[d", "<cmd>lua vim.diagnostic.goto_prev()<CR>")
+Utils.nmap("]d", "<cmd>lua vim.diagnostic.goto_next()<CR>")
+Utils.nmap("<space>q", "<cmd>lua vim.diagnostic.setloclist()<CR>")
+
+-- Set the following keybinds only after LSP attachment
+local on_attach = function(_, bufnr)
+   -- Enable completion triggered by <c-x><c-o>
+  vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')
+
+  -- Mappings.
+  -- See `:help vim.lsp.*` for documentation on any of the below functions
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>', opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>', opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>f', '<cmd>lua vim.lsp.buf.formatting()<CR>', opts)
+end
+
+-- Initialize servers that don't need any extra config
+local simple_servers = {"rust_analyzer"}
+for _, lsp in pairs(simple_servers) do
+  require("lspconfig")[lsp].setup {
+    on_attach = on_attach,
+    flags = {
+      debounce_text_changes = 150,
+    }
+  }
+end
+
+-- LSP: Lua (Sumneko)
+local runtime_path = vim.split(package.path, ";")
+table.insert(runtime_path, "lua/?.lua")
+table.insert(runtime_path, "lua/?/init.lua")
+
+require("lspconfig").sumneko_lua.setup {
+  settings = {
+    Lua = {
+      runtime = {
+        version = "LuaJIT",
+        path = runtime_path,
+      },
+      diagnostics = {
+        globals = {"vim"},
+      },
+      workspace = {
+        library = vim.api.nvim_get_runtime_file("", true),
+      },
+      telemetry = {
+        enable = false,
+      },
+    },
+  },
+}

dot_config/nvim/lua/utils.lua

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+-- General utilities
+
+local M = {}
+
+function M.map(mode, lhs, rhs)
+  vim.api.nvim_set_keymap(mode, lhs, rhs, {silent = true})
+end
+
+function M.nmap(lhs, rhs) M.map("n", lhs, rhs) end
+function M.xmap(lhs, rhs) M.map("x", lhs, rhs) end
+
+return M