One way to hook function elegantly using IRTools.

hook.jl

using IRTools

macro hook(method_call_ex, f_name, args...)
    ir = gensym()
    f = gensym()
    return esc(quote
        local $ir = IRTools.@code_ir($method_call_ex)
        # first: the original function body
        IRTools.pushfirst!($ir, :(println("Hello World!")))
        local $f = IRTools.func($ir)
  
        function $f_name($(args...))
            # second: the body of new defined function
            println("f_name: ", $f_name)
            return $f(nothing, $(args...))
        end
    end)
end

""" normal function """
pow(x, n) = x^n
@hook(pow(1,1), pow, x, n)

println(pow(2, 2))
# f_name: pow
# Hello World!
# 4

""" with args... """
pow(a, b, args...) = a^b
@hook(pow(2,2,2), pow, a, b, args...)

println(pow(2, 4, 2))
# f_name: pow
# Hello World!
# 16

Just a simple example, still need polished more.