dotfiles/nvim/lua/autocmds.lua

-- Autocommands for handling large files and switching between large file buffers and others
local largefile_group = vim.api.nvim_create_augroup('largefile', { clear = true })
local max_filesize = 4 * (1024 * 1024) -- 4 MB

local old_eventignore = false

-- Disables syntax, treesitter and folding on larger files
vim.api.nvim_create_autocmd({ 'BufReadPre' }, {
    group = largefile_group,
    callback = function(ev)
        if ev.file then
            local status, size = pcall(function() return vim.loop.fs_stat(ev.file).size end)
            if status and size > max_filesize then
                old_eventignore = vim.o.eventignore
                vim.o.eventignore = 'FileType' -- Reduce the calls for filetype specific plugins or syntax highlighting

                vim.b[ev.buf].is_large_file = true
                vim.bo['bufhidden'] = 'unload'
                vim.bo['buftype'] = 'nowrite'
                vim.bo['swapfile'] = false
                vim.bo['undofile'] = false
                vim.bo['undolevels'] = -1
            end
        end
    end,
})

vim.api.nvim_create_autocmd({ 'BufWinEnter' }, {
    group = largefile_group,
    callback = function(ev)
        if old_eventignore ~= false then
            vim.o.eventignore = old_eventignore -- Restore the old setting
            old_eventignore = false
        end
        if vim.b[ev.buf].is_large_file then
            vim.wo.wrap = false
        else
            vim.wo.wrap = vim.o.wrap -- Restore to default setting
        end
    end
})

-- End large file handling