Begin parsing arguments and add checkout command handler

lib/svi.rb

@@ -4,5 +4,11 @@ require_relative "svi/version"
 require "svi/svi"
 
 module Svi
-  # Your code goes here...
+  class << self
+
+    def checkout(url)
+      0
+    end
+
+  end
 end

lib/svi/cli.rb

@@ -1,9 +1,70 @@
+require "yawpa"
+
 module Svi
   module Cli
     class << self
-      def run(args)
-        0
+
+      ALIASES = {
+        "co" => "checkout",
+      }
+
+      HELP_TEXT = <<EOS
+Usage: svi [options] <command> [parameters...]
+  Global options:
+    --version       show svi version and exit
+    --help, -h      show this help and exit
+
+  Commands:
+    checkout/co     check out Subversion URL
+EOS
+
+      def run(params)
+        options = {
+          version: {},
+          help: {short: "h"},
+        }
+        opts, args = Yawpa.parse(params, options, posix_order: true)
+        if opts[:version]
+          puts "svi, version #{Svi::VERSION}"
+          return 0
         end
+        if opts[:help]
+          puts HELP_TEXT
+          return 0
+        end
+        if args.size < 1
+          $stderr.puts HELP_TEXT
+          return 1
+        end
+        run_subcommand(*args)
+      end
+
+      private
+
+      def run_subcommand(subcommand, *params)
+        if ALIASES[subcommand]
+          subcommand = ALIASES[subcommand]
+        end
+        command_function = "cmd_#{subcommand}".to_sym
+        if private_methods.include?(command_function)
+          Cli.__send__(command_function, params)
+        else
+          $stderr.puts "Unknown command #{subcommand}"
+          1
+        end
+      end
+
+      def cmd_checkout(params)
+        options = {}
+        opts, args = Yawpa.parse(params, options, posix_order: true)
+        if args.size < 1
+          $stderr.puts "Error: must specify URL"
+          return 1
+        end
+        url, = args
+        Svi.checkout(url)
+      end
+
     end
   end
 end