local job_id, job_buffer

local function job_exit(jobId, exit_code, _)
    job_id = nil
    echo("Job done")
end

local function has_buffer()
    return job_buffer and vim.fn.buflisted(job_buffer) == 1
end

function save_all_and_build()
    if job_id then
        echo ("Job processing")
        return
    end

    local opts = {}
    vim.api.nvim_exec('wa', opts)
    
    if not has_buffer() then 
        job_buffer = vim.api.nvim_create_buf(true, true)
    end
    local job_window = vim.fn.bufwinnr(job_buffer)
    if job_window ~= -1 then
        vim.cmd(job_window .. ' wincmd w')
    else
        vim.cmd('buffer ' .. job_buffer)
    end
    vim.api.nvim_buf_set_option(job_buffer, 'filetype', 'build')
    vim.api.nvim_buf_set_option(job_buffer, 'modified', false)
    -- TODO: if I want to get fancy I can set a build string per language.
    job_id = vim.fn.termopen("zig build", {on_exit = job_exit})
    vim.api.nvim_buf_set_name(job_buffer, '[build]')
end