Switch to more object-oriented structure

exe/uplot

@@ -1,33 +1,5 @@
 #!/usr/bin/env ruby
 
 require 'uplot'
-require 'unicode_plot'
-require 'optparse'
 
-parser = OptionParser.new
-
-subparsers = Hash.new do |_h, k|
-  warn "no such subcommand: #{k}"
-  exit 1
-end
-
-params = {}
-
-subparsers['hist'] = OptionParser.new.tap do |opt|
-  opt.on('--nbins VAL') { |v| params[:nbins] = v.to_i }
-  opt.on('-p') { |v| params[:p] = v }
-end
-
-parser.order!(ARGV)
-params[:type] = ARGV.shift
-subparsers[params[:type]].parse!(ARGV) unless ARGV.empty?
-
-input_lines = readlines.map(&:chomp)
-
-case params[:type]
-when 'hist', 'histogram'
-  series = input_lines.map(&:to_f)
-  UnicodePlot.histogram(series, nbins: params[:nbins]).render
-end
-
-puts input_lines if params[:p]
+Uplot::Command.new(ARGV).run

lib/uplot.rb

@@ -1 +1,46 @@
 require 'uplot/version'
+require 'unicode_plot'
+require 'optparse'
+
+module Uplot
+  class Command
+    def initialize(argv)
+      @params = {}
+      @ptype = nil
+      parse_options(argv)
+    end
+
+    def parse_options(argv)
+      parser = OptionParser.new
+      parser.order!(argv)
+      @ptype = argv.shift
+
+      subparsers = Hash.new do |_h, k|
+        warn "no such subcommand: #{k}"
+        exit 1
+      end
+
+      subparsers['hist'] = OptionParser.new.tap do |sub|
+        sub.on('--nbins VAL') { |v| @params[:nbins] = v.to_i }
+        sub.on('-p') { |v| @params[:p] = v }
+      end
+
+      subparsers[@ptype].parse!(argv) unless argv.empty?
+    end
+
+    def run
+      input_lines = readlines.map(&:chomp)
+      case @ptype
+      when 'hist', 'histogram'
+        histogram(input_lines).render
+      end
+
+      puts input_lines if @params[:p]
+    end
+
+    def histogram(input_lines)
+      series = input_lines.map(&:to_f)
+      UnicodePlot.histogram(series, nbins: @params[:nbins])
+    end
+  end
+end