printLevels.d

import std.array, std.stdio;

enum trace = q{version(verbose)
{
  writefln("%s> %s", "-".replicate(++depth), split(__PRETTY_FUNCTION__, ".")[$ - 1]); scope(exit)
  writefln("<%s %s", "-".replicate(depth--), split(__PRETTY_FUNCTION__, ".")[$ - 1]);
}};

ulong depth;

void main()
{
  mixin(trace);
  foo();
}

void foo()
{
  mixin(trace);
  bar();
}

void bar()
{
  mixin(trace);
}