Compile Plots.jl to shorten first-to-plot time

plots-compile.jl

#!/usr/bin/env julia
using Pkg
pkg"add PackageCompiler Plots StatsPlots PyPlot"

using PackageCompiler

snoop = tempname()
open(snoop, "w") do fid
    println(fid, "using Plots")
    println(fid, "p=plot(rand(5), rand(5))")
    println(fid, "display(p)")
end

if get(ENV, "FORCE", "0") == "1"
    create_sysimage(:Plots, replace_default = true, precompile_execution_file = snoop, cpu_target = "x86_64")
else
    cd(mkpath(expanduser("~/.cache/sysimg")))
    create_sysimage(:Plots, sysimage_path = "sys_plots.so", precompile_execution_file = snoop, cpu_target = "x86_64")
    cd(Sys.BINDIR)
    str = """
    #!/bin/bash
    julia -J ~/.cache/sysimg/sys_plots.so \"\$@\"
    """
    write("pjulia", str)
    chmod("pjulia", 0o775)
end