My gedit external tool for compiling and testing in CodeForces problems (C++). Filenames should be formatted like {contest-number}{problem-code}.cpp , for example 294A.cpp

CodeForces.rb

#!/usr/bin/env ruby
# [Gedit Tool]
# Name=CodeForces
# Shortcut=<Control>F6
# Languages=cpp
# Applicability=all
# Output=output-panel
# Input=nothing
# Save-files=document

# for info about external tools, visit https://live.gnome.org/Gedit/Plugins/ExternalTools

%w(net/http timeout).each(&method(:require))

begin
	name = ENV['GEDIT_CURRENT_DOCUMENT_NAME'].match(/(.*?)\.cpp/)[1].strip

	path = ENV['GEDIT_CURRENT_DOCUMENT_PATH'].match(/(.*?)\.cpp/)[1].strip

	code = name.match(/(\d+)(\D\w*)/)
  
	compile = `g++ #{ENV['GEDIT_CURRENT_DOCUMENT_PATH']} -o #{path} -O2 2>&1`

	raise compile if compile.match(/error/)
  
	warn compile if compile.match(/warning/)
  
	res = Timeout::timeout(5) {Net::HTTP.get_response('codeforces.com',"/contest/#{code[1]}/problem/#{code[2]}")}

	raise "CodeForces #{res.code} #{res.message}" if res.code != "200"

	sample_tests = res.body.scan(/<pre>(.*?)<\/pre>/).each_slice(2).map(&:flatten).map!{|io| io.map!{|a| a.gsub(/<\s*br\s*\/>/,"\n").strip}}

	time_limit = res.body.match(/(\d+) seconds?/)[1].to_f

	sample_tests.each_with_index do |test,i|
		input,output = test
		`(echo \"#{input}\") > #{name}.in`
		begin
			t = Time.now
			out = Timeout::timeout(time_limit) {`#{path} < #{name}.in`}
			t2 = Time.now
			if out.strip != output
				puts "WA on test case #{i}:\nExpected\n#{output}\nFound\n#{out}", ''
			else
				printf "Test case #{i} passed in %.3f seconds\n", (t2-t)
			end
		rescue Exception => e
			puts "#{e} on test case #{i}"
			pid = `ps -A`.match(/(\d+).*?#{name}/)
			Process.kill('INT', pid[1].to_i) if pid
		end
	end
	`rm #{name}.in #{path}`
rescue Exception => e
	warn e
end