Jekyll's is removing static file during cleanup - plugins

Question

I want to include a gnuplot code inside a markdown page and have Jekyll compile the graph when I save it. The graph image is being saved. But it is removed during jekyll's cleanup. The closest that I have found toward a solution is at Copying generated files from a Jekyll plugin to a site resource folder. However, I don't undersand the overall flow of Jekyll and how I keep static files from being removed. I have added site.static_files << Jekyll::StaticFile.new(site, site.source, path, filename) with no results.
If I create a dummy file outside of the _site folder, Jekyll will keep my file safe inside the _site file. I would rather not have to create that dummy file.
Here is code for my plugin. Any help will be awesome.
class RenderGNUplot < Liquid::Block
def initialize(tag_name, markup, tokens)
super
#markup = markup
#attributes = {}
markup.scan(Liquid::TagAttributes) do |key, value| #attributes[key.to_sym] = value end
end
def gnuplot(commands)
IO.popen("gnuplot", "w") { |io| io.puts commands }
end
def render(context)
site = context.registers[:site]
#file = ""
commands = super
if ( commands =~ /set output "(.*)"/ )
setfile_regex = Regexp.new(/set output "((.*))"/)
filepath = commands[setfile_regex, 1]
#file = File.basename filepath
commands = commands.sub!(commands[setfile_regex], 'set output "_site/media/' + #file +'"' )
p commands
end
gnuplot(commands)
site.static_files << Jekyll::StaticFile.new(site, site.source, "_site/media/", "#{#file}")
# site.static_files << Jekyll::StaticSitemapFile.new(site, site.dest, '/', 'sitemap.xml')
"<object id='' type='image/svg+xml' data='#{site.baseurl}/media/{#file}'>Your browser does not support SVG</object>"
end
end
Liquid::Template.register_tag('test', RenderGNUplot)
And Markdown page
---
layout: post
title: "Thin Server"
date: 2015-04-28 10:42:56
categories: thin
---
{% test location: Test%}
set terminal svg size 600,400 dynamic enhanced fname 'arial' fsize 10 #mousing jsdir 'http://localhost:4000/media/' name "histograms_1" butt dashlength 1.0
set output "media/curves.svg"
set key inside left top vertical Right noreverse enhanced autotitle box lt black linewidth 1.000 dashtype solid
set samples 50, 50
set title "Simple Plots"
set title font ",20" norotate
plot [-10:10] sin(x),atan(x),cos(atan(x))
{% endtest%}

Answer 1

This is the exact code that I am using. It only has the Liquid block and jekyll StaticFile
class GNUplotFile < Jekyll::StaticFile
def write(dest)
puts "WRITE---->>>>>>>>>>>"
#File.write('_site/media/BTTTTT.svg', DateTime.now)
gnuplot(#commands)
# do nothing
end
def gnuplot(commands)
IO.popen("gnuplot", "w") { |io| io.puts commands }
end
def givemethecommands(commands)
#commands = commands
end
end
class RenderGNUplot < Liquid::Block
def initialize(tag_name, markup, tokens)
super
#markup = markup
#attributes = {}
markup.scan(Liquid::TagAttributes) do |key, value| #attributes[key.to_sym] = value end
end
def render(context)
site = context.registers[:site]
#file = ""
commands = super
if ( commands =~ /set output "(.*)"/ )
setfile_regex = Regexp.new(/set output "((.*))"/)
filepath = commands[setfile_regex, 1]
#file = File.basename filepath
commands = commands.sub!(commands[setfile_regex], 'set output "_site/media/' + #file +'"' )
#p commands
end
gnuplot = GNUplotFile.new(site, site.source, "_site/media/", "#{#file}")
gnuplot.givemethecommands commands
site.static_files << gnuplot
# site.static_files << Jekyll::StaticFile.new(site, site.dest, '/', 'sitemap.xml')
"<object id='' type='image/svg+xml' data='#{site.baseurl}/media/#{#file}'>Your browser does not support SVG</object>"
end
end
Liquid::Template.register_tag('test', RenderGNUplot)