Julia plot server.

server.jl

#!/usr/bin/env julia

port = begin
    try
        parse(Int, ARGS[1])
    catch err
        error("usage: `$ julia server.jl <port>`")
    end
end

info("loading Gadfly...")
tic(); using Gadfly; toc()

info("JIT warmup...")
tic()
draw(SVG("output_0.svg", 6inch, 3inch), plot([sin, cos], 0, 25))
toc()

server = listen(port)
info("listening on port: $port")

while true
    conn = accept(server)
    @async begin
        try
            while isopen(conn)
                eval(parse(readline(conn)))
            end
        catch err
            println("Connection ended with error: $err")
        end
    end
end

Usage

First run, ie:

$ julia server.jl 2000
INFO: loading Gadfly...
elapsed time: 4.467008744 seconds
INFO: JIT warmup...
elapsed time: 19.576495406 seconds
INFO: listening on port: 2000

Then on another terminal:

$ echo "draw(SVG(\"output_1.svg\", 6inch, 3inch), plot([sin, cos], 0, 25))" | nc -q0 localhost 2000