Class: Ephem::CLI

Inherits:
Object
  • Object
show all
Defined in:
lib/ephem/cli.rb

Class Method Summary collapse

Class Method Details

.gregorian_to_julian(date_str) ⇒ Object 



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# File 'lib/ephem/cli.rb', line 8

def self.gregorian_to_julian(date_str)
  date = Date.parse(date_str)

  a = (14 - date.month) / 12
  y = date.year + 4800 - a
  m = date.month + 12 * a - 3

  date.day +
    ((153 * m + 2) / 5) +
    365 * y +
    (y / 4) -
    (y / 100) +
    (y / 400) -
    32045
end

.handle_excerpt(args) ⇒ Object

Handle the excerpt command



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# File 'lib/ephem/cli.rb', line 70

def self.handle_excerpt(args)
  # Parse options
  options = {target_ids: nil, debug: false}

  option_parser = OptionParser.new do |opts|
    opts.banner = "Usage: ruby-ephem excerpt [options] START_DATE END_DATE INPUT_FILE OUTPUT_FILE"

    opts.on("--targets TARGET_IDS", "Comma-separated list of target IDs to include") do |targets|
      options[:target_ids] = targets.split(",").map(&:strip).map(&:to_i)
    end

    opts.on("--debug", "Enable debug output") do
      options[:debug] = true
    end
  end

  begin
    option_parser.parse!(args)
  rescue OptionParser::InvalidOption => e
    puts e.message
    puts option_parser
    return
  end

  if args.size < 4
    puts "Not enough arguments."
    puts option_parser
    return
  end

  start_date_str = args[0]
  end_date_str = args[1]
  input_file = args[2]
  output_file = args[3]

  unless File.exist?(input_file)
    puts "Error: Input file '#{input_file}' does not exist."
    return
  end

  begin
    start_jd = gregorian_to_julian(start_date_str)
    end_jd = gregorian_to_julian(end_date_str)
  rescue Date::Error => e
    puts "Error parsing dates: #{e.message}"
    puts "Dates should be in YYYY-MM-DD format."
    return
  end

  begin
    puts "Creating excerpt from #{input_file} to #{output_file}..."
    puts "Date range: #{start_date_str} to #{end_date_str} (JD #{start_jd} to #{end_jd})"
    if options[:target_ids]
      puts "Including targets: #{options[:target_ids].join(", ")}"
    else
      puts "Including all targets"
    end

    spk = Ephem::SPK.open(input_file)

    excerpt_spk = spk.excerpt(
      output_path: output_file,
      start_jd: start_jd,
      end_jd: end_jd,
      target_ids: options[:target_ids],
      debug: options[:debug]
    )

    puts "Excerpt created successfully!"
    puts "Original segments: #{spk.segments.size}"
    puts "Excerpt segments: #{excerpt_spk.segments.size}"

    original_size = File.size(input_file)
    excerpt_size = File.size(output_file)
    reduction_percentage =
      ((original_size - excerpt_size) / original_size.to_f * 100).round(2)

    puts "File size reduced by #{reduction_percentage}%"
    puts "Original: #{original_size} bytes"
    puts "Excerpt: #{excerpt_size} bytes"

    spk.close
    excerpt_spk.close
  rescue => e
    puts "Error creating excerpt: #{e.message}"
    puts e.backtrace if options[:debug]
  end
end

.show_help ⇒ Object 



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# File 'lib/ephem/cli.rb', line 45

def self.show_help
  puts <<~HELP
    Ruby Ephem - A tool for working with JPL Ephemerides

    Commands:
      excerpt - Create an excerpt of an SPK file
      help    - Show this help message

    Excerpt command:
      ruby-ephem excerpt [options] START_DATE END_DATE INPUT_FILE OUTPUT_FILE

    Options:
      --targets TARGET_IDS  - Comma-separated list of target IDs to include
                              (default: all targets)

    Example:
      ruby-ephem excerpt --targets 3,10,399 2000-01-01 2030-01-01 de440s.bsp excerpt.bsp

    This will create an excerpt of de440s.bsp containing only the specified
    targets (Earth-Moon barycenter, Sun, Earth) for the period from
    2000-01-01 to 2030-01-01.
  HELP
end

.start(args) ⇒ Object 



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# File 'lib/ephem/cli.rb', line 24

def self.start(args)
  if args.empty?
    puts "Usage: ruby-ephem excerpt [options] START_DATE END_DATE INPUT_FILE OUTPUT_FILE"
    puts "For help: ruby-ephem help"
    return
  end

  if args[0] == "help"
    show_help
    return
  end

  if args[0] == "excerpt"
    handle_excerpt(args[1..])
    return
  end

  puts "Unknown command: #{args[0]}"
  puts "Available commands: excerpt, help"
end