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jruby on windows コマンドライン引数からのファイル名の扱い

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--1.9 モード前提。最終的に jruby -E Windows-31J:UTF-8 で起動させて、encodingはさわらない。

# encoding: Shift_JIS
require 'optparse'

opts = OptionParser.new
opts.on("-i VAL") { ifilename = v }

File.exist?(ifilename)
open(ifilename)

ソースの # encoding: Shift_JIS はべつに UTF-8 にしてソースのエンコードを変えてもいいと思われ。
-E オプションなしで、ifilename = v.encode("UTF-8") とかしてもうまくいかなかった。

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