A common convention in python is to structure the main functionality of a script as follows, so it can be both run as a script directly or imported without executing main() at the time of import:

def main():
    do_stuff()

if __name__ == '__main__':
    main()

Is there a similar variable that gets set in Julia, so that the script can be aware of whether it was imported using require("script.jl") or executed directly?

For example, say I have two scripts, a.jl and b.jl, along with a magic_function() that behaves as follows:

a.jl:

println("Did we execute a.jl directly? ", magic_function())

b.jl:

require("a.jl")

Executing the following commands results in ...

> julia a.jl
Did we execute a.jl directly? true
> julia b.jl
Did we execute a.jl directly? false

Does a function like magic_function() exist in the current distribution of Julia?

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