irb in Mac OS X 10.5.*
Mac OS X のLeopard でirbを使って驚いたのでメモ．
[ことはじめ]
irb内でKconvやNKFを使ってみようとrequire.
> もう読み込んでいるよ！と怒られる．
>> 確かに，requireしなくても当たり前のようにライブラリが使える．
これまで（WinXP, Mac OS X Tiger, Linux...etc）はこんなこと無かったハズ．
[訂正]
winXPに入れた ruby 1.8.6(i386-mswin32)でも
Kconv他いろいろと最初から使える状態だった．記憶違い？
# ちなみにConfigは存在せず．
[しらべる]
>> Object::constants.sort
=> ["APPLE_GEM_HOME", "ARGF", "ARGV", "ArgumentError", "Array",
"Bignum", "Binding", "CROSS_COMPILING", "Class", "Comparable",
"ConditionVariable", "Config", "Continuation", "DTracer", "Data",
"Dir", "ENV", "EOFError", "ETC_IRBRC_LOADED", "Enumerable",
"Errno", "Exception", "Exception2MessageMapper", "FALSE", "FalseClass",
"File", "FileTest", "Fixnum", "Float", "FloatDomainError",
"GC", "Gem", "HISTFILE", "Hash", "IO", "IOError", "IRB",
"IndexError", "Integer", "Interrupt",
"Kconv", "Kernel", "LoadError", "LocalJumpError",
"MAXHISTSIZE", "Marshal", "MatchData", "MatchingData", "Math",
"Method", "Module", "Mutex",
"NIL", "NKF", "NameError",
"NilClass", "NoMemoryError",
"NoMethodError", "NotImplementedError", "Numeric", "Object",
"ObjectSpace", "PLATFORM", "Precision", "Proc", "Process", "Queue",
"RELEASE_DATE", "RUBY_FRAMEWORK",
"RUBY_FRAMEWORK_VERSION", "RUBY_PATCHLEVEL",
"RUBY_PLATFORM", "RUBY_RELEASE_DATE", "RUBY_VERSION",
"Range", "RangeError", "RbConfig", "Readline",
"Regexp", "RegexpError", "RubyLex", "RubyToken",
"RuntimeError", "SLex", "STDERR",
"STDIN", "STDOUT", "ScriptError", "SecurityError",
"Signal", "SignalException", "SizedQueue",
"StandardError", "String", "Struct", "Symbol",
"SyntaxError", "SystemCallError", "SystemExit", "SystemStackError",
"TOPLEVEL_BINDING",
"TRUE", "Thread", "ThreadError", "ThreadGroup", "Time",
"TrueClass", "TypeError", "UnboundMethod", "VERSION",
"ZeroDivisionError"]確かに居る．あれ？と思い，irbの設定を調べてみる．
# irbrcは以下のファイルだけだった．
/private/etc/irbrc中を見ても特に初期インポートにあたる箇所は以下だけ．
require 'rubygems'
require 'irb/completion'あとはirbのhistroy読み込みについてだけだった．
んー, 釈然としないのでirbを起動して
IRB.conf
Config::CONFIG
を見てみるもpathがあるだけぽい．
# 実際にrequireはしていない
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib気になってirbのconf内を見てみたら
local.rb に
autoload :Kconv, "kconv" なんて発見.
...これ...か？
まだ釈然としないけど，また後で調べてみる！
# さすがに
irb -r libname 