Split neovim lua configuration into separate files

These seperate files should be put into $HOME/.config/nvim/lua

nvim/lua/auto-commands.lua

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+--colorscheme
+vim.cmd('colorscheme space_vim_theme')
+vim.cmd('syntax enable')
+
+--open folds by default
+vim.cmd('autocmd Syntax * normal zR')
+
+--file specific formatting
+vim.cmd([[
+	autocmd Filetype python,bash,sh,java,php,json
+	\ setlocal tabstop=4 softtabstop=4 shiftwidth=4
+	\ expandtab autoindent fileformat=unix
+]])
+
+vim.cmd([[
+	autocmd Filetype css,scss,html,htmldjango,javascript,yaml
+	\ setlocal tabstop=2 softtabstop=2 shiftwidth=2
+	\ expandtab autoindent
+]])
+
+--color trailing spaces with red color
+vim.cmd('highlight ExtraWhitespace ctermbg=green guibg=green')
+vim.cmd('match ExtraWhitespace /s+$/')
+vim.cmd('autocmd BufWinEnter * match ExtraWhitespace /s+$/')
+vim.cmd('autocmd InsertEnter * match ExtraWhitespace /s+%#@<!$/')
+vim.cmd('autocmd InsertLeave * match ExtraWhitespace /s+$/')
+vim.cmd('autocmd BufWinLeave * call clearmatches()')

nvim/lua/keybindings.lua

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+vim.api.nvim_set_keymap('n', '<C-E>', '<cmd>:NERDTreeToggle<CR>', {noremap=true, silent=true})

nvim/lua/lsp.lua

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+--add additional capabilities supported by nvim-cmp
+local capabilities = vim.lsp.protocol.make_client_capabilities()
+capabilities = require('cmp_nvim_lsp').update_capabilities(capabilities)
+
+--use an on_attach function to only map the following keys
+--after the language server attaches to the current buffer
+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
+
+  -- Enable completion triggered by <c-x><c-o>
+  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')
+
+  -- Mappings.
+  local opts = { noremap=true, silent=true }
+
+  --see `:help vim.lsp.*` for documentation on any of the below functions
+  buf_set_keymap('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>', opts)
+  buf_set_keymap('n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>', opts)
+  buf_set_keymap('n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', opts)
+  buf_set_keymap('n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
+  buf_set_keymap('n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
+end
+
+local nvim_lsp = require('lspconfig')
+
+--enable some language servers with the additional completion capabilities
+--offered by nvim-cmp
+local servers = { 'pyright', 'ansiblels', 'yamlls', 'tsserver' }
+
+for _, lsp in ipairs(servers) do
+  nvim_lsp[lsp].setup {
+    on_attach = on_attach,
+    capabilities = capabilities,
+  }
+end

nvim/lua/nvim-cmp.lua

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+local cmp = require('cmp')
+
+cmp.setup {
+  mapping = {
+    ['<C-p>'] = cmp.mapping.select_prev_item(),
+    ['<C-n>'] = 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.Replace,
+      select = true,
+    },
+    ['<Tab>'] = function(fallback)
+      if cmp.visible() then
+        cmp.select_next_item()
+      else
+        fallback()
+      end
+    end,
+    ['<S-Tab>'] = function(fallback)
+      if cmp.visible() then
+        cmp.select_prev_item()
+      else
+        fallback()
+      end
+    end,
+  },
+  sources = {
+    { name = 'nvim_lsp' },
+  },
+}

nvim/lua/options.lua

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+--fix different locale settings when ssh'ing
+vim.o.encoding = 'utf-8'
+
+vim.o.syntax = 'on'
+
+--display all matching files when we tab complete
+vim.o.wildmenu	 = true
+
+--replace vertical split pipe character with space
+vim.o.fillchars = 'vert:|,fold: '
+
+--Having longer updatetime (default is 4000 ms = 4 s) leads to noticeable
+--delays and poor user experience.
+vim.o.updatetime = 300
+
+vim.o.splitright = true
+vim.o.splitbelow = true
+
+--switch buffers without writing to file
+vim.o.hidden = true  
+
+--fold indents
+vim.o.foldmethod = 'indent'
+
+--don't open folds when jumping over one with (, {, [[ or [{
+vim.opt.foldopen = vim.opt.foldopen - { 'block' }
+
+--search down into subfolders
+--provides tab-completion for all file-related tasks
+vim.opt.path = vim.opt.path + { '**' }
+
+--line numbers
+vim.o.number = true
+
+--changes to current directory when creating new files
+vim.o.autochdir = true
+
+--higlhight search
+vim.o.hls = true
+
+--search as characters are entered
+vim.o.incsearch = true
+
+--line for linewrapping
+vim.o.colorcolumn = '80'
+
+--wrap text instead of being on one line
+vim.o.lbr = true
+
+--default Colors for CursorLine
+vim.o.cursorline = true
+
+vim.o.termguicolors = true
+vim.o.background = 'dark'
+
+--enable statusbar
+vim.o.laststatus = 2
+vim.o.statusline = ' %F %m%r%w %= %{hostname()}   %{strlen(&ft)?&ft:"none"} %{(&bomb?",BOM":"")} %{&ff}  %l/%L  %c %P'