vim: port autocmd to lua using wrapper function

Wrapper is needed until this PR is merged into neovim:

    https://github.com/neovim/neovim/pull/14661

nvim/init.lua

@@ -1,4 +1,5 @@
 require 'fs.options'
 require 'fs.plugins'
+require 'fs.autocmds'
 vim.cmd('runtime old.vim')
 

nvim/init.vim

@@ -1,3 +1,2 @@
 source ~/.config/nvim/viml/keymaps.vim
-source ~/.config/nvim/viml/autocmds.vim
 

nvim/lua/fs/autocmds.lua

@@ -0,0 +1,36 @@
+local function make_autocmds(groups)
+    for name, commands in pairs(groups) do
+        vim.cmd('augroup my_' .. name)
+        vim.cmd('autocmd!')
+        for _, item in ipairs(commands) do
+            vim.cmd('autocmd ' .. table.concat(item, ' '))
+        end
+        vim.cmd('augroup END')
+    end
+end
+
+make_autocmds {
+    buffers = {
+        { 'BufNewFile,BufRead', 'bash_profile,bashrc,profile', 'set filetype=sh' },
+        { 'BufNewFile,BufRead', 'gitconfig', 'set filetype=gitconfig' },
+        { 'BufNewFile,BufRead', '*.sx,*.s19', 'set filetype=srec' },
+        { 'BufNewFile,BufRead', 'Vagrantfile', 'set filetype=ruby' },
+    },
+    filetypes = {
+        { 'FileType', 'gitcommit', 'setlocal textwidth=72' },
+        { 'FileType', 'gitcommit,markdown,text', 'setlocal formatoptions+=t spell' },
+        { 'FileType', 'python', 'setlocal foldmethod=indent foldignore=' },
+        { 'FileType', 'vim', 'set foldmethod=marker' },
+    },
+    windows = {
+        -- Disable cursorline when entering Insert mode (but remember it)...
+        { 'InsertEnter', '*', 'let g:stored_cursorline=&cursorline | set nocursorline' },
+        -- ...and re-enable when leaving if it had been set before.
+        { 'InsertLeave', '*', 'let &cursorline=g:stored_cursorline' },
+    },
+    yank = {
+        -- Briefly highlight yanked text.
+        { 'TextYankPost', '*', 'silent! lua vim.highlight.on_yank()' },
+    },
+}
+