Quick and dirty macro/function to show some source code of a function

showsource.jl

macro showsource(ex0...)
    InteractiveUtils.gen_call_with_extracted_types_and_kwargs(__module__, :showsource, ex0)
end

showsource(f, @nospecialize t; kwargs...) = showsource(functionloc(f,t)...; kwargs...)

function showsource(file::AbstractString, line::Integer; nlines = 10)
  run(pipeline(`tail -n +$(line) $file`, `head -n $(nlines)`))
  nothing
end

#Usage: @showsource nlines=30 sin(1.) 
# by default, nlines is 10 if not specified