A CLI grader for Runestone Academy assignments

runestone.rb

require 'http'

max_points = 30
cutoff_time = Time.local(2018,3,23,10,10)
question = 'IT105_AY182_GradedLab01_01'
base = 'https://runestone.academy/runestone/'
http = HTTP.cookies session_id_runestone: ENV['RUNESTONE_SESSION_ID']

names = JSON.parse http.get(base+'admin/course_students').to_s
names = names.to_a.sort.to_h

names.each_with_index do |(sid,name),i|
  params = { sid: sid, acid: question }
  comments = JSON.parse(http.get(base+'admin/getGradeComments', params: params).to_s)
  
  if comments['grade'] == max_points
    puts "Perfect score for #{name}, skipping ..."
    next
  end

  history = JSON.parse(http.get(base+'/ajax/gethist.json', params: params).to_s)

  if history['timestamps'].empty?
    puts "no submissions for #{name}, skipping ..."
    next
  end
  
  submissions = history['timestamps'].map do |string|
    # arg. times should always be in iso8601
    Time.parse string + "-00:00"
  end.zip history['history']
    
  submissions.reject! {|t,_| t > cutoff_time}
  time, code = submissions.last
  
  system('clear')
  puts "===================================="
  puts "Student #{i}/#{names.size} - #{comments['grade']}/#{max_points} points"
  puts "#{name} (#{sid})"
  puts time
  puts "===================================="
  puts 
  puts code
  puts "\n"
  print "Comments (#{comments['comments']}): "
  comment = gets.strip
  print "Grade (#{comments['grade']}): "
  grade = gets.strip
  
  unless comment.empty? and grade.empty? 
    puts "Saving ..."
    grade = grade.empty? ? comments['grade'] : grade.to_i
    comment = comment.empty? ? comments['coment'] : comment
    form = { acid: question, sid: sid, grade: grade, comment: comment }
    http.post(base+'assignments/record_grade', form: form)
  end
end