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require 'optparse'
require 'knapsack_solver/cli_option_checker'
module KnapsackSolver
# This class parses command line arguments provided to the knapsack_solver
# binary.
class CliOptionParser
# Message that describes how to use this CLI utility.
USAGE_MESSAGE = 'Usage: knapsack_solver OPTIONS DATASET_FILE...'.freeze
# Parses command-line arguments and removes them from the array of
# arguments.
#
# @param [Array] arguments the command-line arguments.
# @return [Hash] hash of recognized options.
#
# rubocop:disable Metrics/AbcSize, Metric/MethodLength, Metric/BlockLength
def self.parse(arguments)
options = {}
parser = OptionParser.new do |opts|
opts.banner = USAGE_MESSAGE
opts.on('-b', '--branch-and-bound', 'Use branch and boung method of solving') do
options[:branch_and_bound] = true
end
opts.on('-d', '--dynamic-programming', 'Use dynamic programming for solving') do
options[:dynamic_programming] = true
end
opts.on('-f', '--fptas', 'Use FPTAS for solving') do
options[:fptas] = true
end
opts.on('-r', '--heuristic', 'Use brute force method of solving') do
options[:heuristic] = true
end
opts.on('-e', '--fptas-epsilon EPS', 'Relative error for FPTAS from range (0,1)') do |eps|
options[:fptas_epsilon] = eps
end
opts.on('-o', '--output DIR', 'Directory for output log files') do |dir|
options[:output_dir] = dir
end
opts.on('-g', '--graphs DIR', 'Directory for graphs') do |dir|
options[:graphs_dir] = dir
end
opts.on('-v', '--version', 'Show program version') do
options[:version] = true
end
opts.on_tail('-h', '--help', 'Show this help message') do
options[:help] = true
end
end
parser.parse!(arguments)
process_help_and_version_opts(options, arguments, parser.to_s)
end
# rubocop:enable Metrics/AbcSize, Metric/MethodLength, Metric/BlockLength
def self.process_help_and_version_opts(options, arguments, usage_msg)
if !options[:help] && !options[:version]
CliOptionChecker.check(options, arguments)
return options
end
if options[:help]
puts usage_msg
elsif options[:version]
puts "knapsack_solver #{KnapsackSolver::VERSION}"
end
nil
end
end
end
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