nvim/lua/config/autocmds.lua

-- Save the last file on exit
vim.api.nvim_create_autocmd("VimLeave", {
    callback = function()
        local last_file = vim.fn.expand('%:p') -- Get the absolute path of the current file
        if last_file ~= "" then          -- The operator means not equal in lua
            local file = io.open(vim.fn.stdpath('data') .. "/lastfile.txt", "w")
            if file then
                file:write(last_file)
                file:close()
            end
        end
    end,
})

vim.api.nvim_create_autocmd("FileType", {
    pattern = "nix",
    callback = function()
        vim.bo.tabstop = 2
        vim.bo.shiftwidth = 2
        vim.bo.expandtab = true
    end,
})

vim.api.nvim_create_autocmd("FileType", {
    pattern = "c",
    callback = function()
        vim.bo.tabstop = 2
        vim.bo.shiftwidth = 2
        vim.bo.expandtab = true
    end,
})

vim.api.nvim_create_augroup("RememberFolds", {
    clear = true
})
vim.api.nvim_create_autocmd({ "BufWinLeave" }, {
    group = "RememberFolds",
    pattern = "*",
    command = "silent! mkview",
})
vim.api.nvim_create_autocmd({ "BufWinEnter" }, {
    group = "RememberFolds",
    pattern = "*",
    command = "silent! loadview",
})