Refactor command line options

bin/racc

@@ -92,45 +92,40 @@ def main
   #}
   parser.on('--version', 'Prints version and quit.') {
     puts "racc version #{Racc::Version}"
-    exit 0
+    exit
   }
   parser.on('--runtime-version', 'Prints runtime version and quit.') {
-    printf "racc runtime version %s; %s\n",
+    printf "racc runtime version %s; %s core version %s\n",
            Racc::Parser::Racc_Runtime_Version,
+           Racc::Parser.racc_runtime_type,
            if Racc::Parser.racc_runtime_type == 'ruby'
-             sprintf('ruby core version %s',
-                     Racc::Parser::Racc_Runtime_Core_Version_R)
+             Racc::Parser::Racc_Runtime_Core_Version_R
            else
-             sprintf('c core version %s',
-                     Racc::Parser::Racc_Runtime_Core_Version_C)
+             Racc::Parser::Racc_Runtime_Core_Version_C
            end
-    exit 0
+    exit
   }
   parser.on('--copyright', 'Prints copyright and quit.') {
     puts Racc::Copyright
-    exit 0
+    exit
   }
   parser.on('--help', 'Prints this message and quit.') {
     puts parser.help
-    exit 1
+    exit
   }
   begin
     parser.parse!
   rescue OptionParser::ParseError => err
-    $stderr.puts err.message
-    $stderr.puts parser.help
-    exit 1
+    abort [err.message, parser.help].join("\n")
   end
   if ARGV.size > 1
-    $stderr.puts 'too many input'
-    exit 1
+    abort 'too many input'
   end
 
   input = ARGV[0] || "stdin"
 
   if input == "stdin" && !output then
-    $stderr.puts 'You must specify a path to read or use -o <path> for output.'
-    exit 1
+    abort 'You must specify a path to read or use -o <path> for output.'
   end
 
   begin
@@ -142,7 +137,7 @@ def main
     }
     if check_only
       $stderr.puts 'syntax ok'
-      exit 0
+      exit
     end
 
     $stderr.puts 'Generating LALR states...' if verbose
@@ -201,8 +196,7 @@ def main
   rescue Racc::Error, Errno::ENOENT, Errno::EPERM => err
     raise if $DEBUG or debug_flags.any?
     lineno = err.message.slice(/\A\d+:/).to_s
-    $stderr.puts "#{File.basename $0}: #{input}:#{lineno} #{err.message.strip}"
-    exit 1
+    abort "#{File.basename $0}: #{input}:#{lineno} #{err.message.strip}"
   end
 end