Find the location of the function I'm calling?

How can I figure out where the calling function is located? I want an include to be relative to the function itself.

Not sure I understand the “include relative to the function” part, but you can find where the function is located with the help of @which macro

julia> using Plots

julia> @which plot([1], [1])
plot(args...; kw...) in Plots at /home/skoffer/.julia/packages/Plots/oZheM/src/plot.jl:49

It sounds like you want stacktrace() to me which returns an Array containing the stack:

julia> example() = stacktrace()
example (generic function with 1 method)

julia> example_1() = example()
example_1 (generic function with 1 method)

julia> example_1()
15-element Array{Base.StackTraces.StackFrame,1}:
 example at REPL[7]:1 [inlined]
 example_1() at REPL[8]:1
 top-level scope at REPL[9]:1
 eval(::Module, ::Any) at boot.jl:331
 eval_user_input(::Any, ::REPL.REPLBackend) at REPL.jl:134
 repl_backend_loop(::REPL.REPLBackend) at REPL.jl:195
 start_repl_backend(::REPL.REPLBackend, ::Any) at REPL.jl:180
 run_repl(::REPL.AbstractREPL, ::Any; backend_on_current_task::Bool) at REPL.jl:292
 run_repl(::REPL.AbstractREPL, ::Any) at REPL.jl:288
 (::Base.var"#807#809"{Bool,Bool,Bool,Bool})(::Module) at client.jl:399
 #invokelatest#1 at essentials.jl:710 [inlined]
 invokelatest at essentials.jl:709 [inlined]
 run_main_repl(::Bool, ::Bool, ::Bool, ::Bool, ::Bool) at client.jl:383
 exec_options(::Base.JLOptions) at client.jl:313
 _start() at client.jl:506

So you want want stacktrace()[2] as the calling method, I think.

I finally found it, @__FILE__ or @__DIR__.