Relative timestamp filter program in D

ts.d

void main()
{
    import core.time : MonoTime;
    import std.stdio : stdin, writef;
    import std.string : wrap;
    const start = MonoTime.currTime;
    foreach (line; stdin.byLineCopy)
    {
        const now = MonoTime.currTime;
        const diff = now - start;
        const indent = "          ";
        "[%+7s] %s".writef(diff.total!"msecs", line.wrap(80, "", indent));
    }
}