mirror of https://github.com/safiire/n65.git
82 lines
1.8 KiB
Ruby
82 lines
1.8 KiB
Ruby
require 'optparse'
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require_relative '../n65'
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module N65
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####
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## This class handles the front end aspects,
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## parsing the commandline options and running the assembler
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class FrontEnd
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####
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## Initialize with ARGV commandline
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def initialize(argv)
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@options = {:output_file => nil}
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@argv = argv.dup
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end
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####
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## Run the assembler
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def run
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## First use the option parser
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parser = create_option_parser
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parser.parse!(@argv)
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## Whatever is leftover in argv the input files
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if @argv.size.zero?
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STDERR.puts("No input files")
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exit(1)
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end
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## Only can assemble one file at once for now
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if @argv.size != 1
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STDERR.puts "Can only assemble one input file at once :("
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exit(1)
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end
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input_file = @argv.shift
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## Make sure the input file exists
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unless File.exists?(input_file)
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STDERR.puts "Input file #{input_file} does not exist"
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exit(1)
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end
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## Maybe they didn't provide an output file name, so we'll guess
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if @options[:output_file].nil?
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ext = File.extname(input_file)
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@options[:output_file] = input_file.gsub(ext, '') + '.nes'
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end
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if @options.values.any?(&:nil?)
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STDERR.puts "Missing options try --help"
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exit(1)
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end
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N65::Assembler.from_file(input_file, @options[:output_file])
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end
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private
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####
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## Create a commandline option parser
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def create_option_parser
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OptionParser.new do |opts|
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opts.banner = "Usage: #{$0} [options] <input_file.asm>"
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opts.on('-o', '--outfile filename', 'outfile') do |output_file|
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@options[:output_file] = output_file;
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end
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opts.on('-h', '--help', 'Displays Help') do
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puts opts
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exit
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end
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end
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end
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end
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end
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