how to writefile at compile time when using source code filter

[jk49]

without writeFile at compile time, I can generate `users.nim` no problem,

`users.nim`
    
    
    template table(name: untyped) =
        type
            `name`* = object
                name*: string
                job*: string
                email*: string
        type
            `name Table`* = object
                list*:seq[`name`]
    
    table(Person)
    
    proc add_row*(users: var PersonTable, p: Person): string =
        users.list.add(p)
    
    
    Run