yes there's a bit of java in my nvim config why do you ask?

lua/conf/autos.lua

@@ -0,0 +1,50 @@
+local misc = require('core.misc')
+local auto, augroup = misc.auto, misc.augroup
+
+-- auto commands which interact with bufferes without modifying them
+local bufcheck = augroup('bufcheck')
+-- auto commands which modify things on the filesystem
+local fsmod = augroup('fsmod')
+
+auto('FocusGained', {
+  group = bufcheck,
+  desc = 'Update contents of file.',
+  command = 'checktime',
+})
+
+auto('TextYankPost', {
+  pattern = '*',
+  group = bufcheck,
+  desc = 'Highlight on yank.',
+  callback = function()
+    vim.highlight.on_yank { timeout = 250 }
+  end
+})
+
+auto('BufRead', {
+  pattern = '*',
+  group = bufcheck,
+  desc = 'Return to the last place the buffer was closed in.',
+  callback = function()
+    vim.cmd([[call setpos(".", getpos("'\""))]])
+    vim.api.nvim_input('zz')
+  end
+})
+
+auto('BufWritePre', {
+  pattern = '*',
+  group = fsmod,
+  desc = 'remove trailing spaces on file save',
+  command = [[%s/\s\+$//e]]
+})
+
+auto('BufWritePre', {
+  pattern = '*',
+  group = fsmod,
+  desc = 'Basically mkdir -p.',
+  callback = function(ctx)
+    if ctx.match:match("^%w%w+://") then return end
+    local dir = vim.fn.fnamemodify(ctx.file, ':p:h')
+    vim.fn.mkdir(dir, 'p')
+  end
+})