Issue #19191 has been updated by YO4 (Yoshinao Muramatsu). irb changes $stdin.{external,internal}_encoding. This causes gets() to no longer return the correct content in irb. ``` C:\>chcp 現在のコード ページ: 932 C:\>ruby -e "p [STDIN.external_encoding, STDIN.internal_encoding]" [#<Encoding:Windows-31J>, #<Encoding:UTF-8>] C:\>ruby -e "gets.then { p [_1, _1.encoding] }" あ ["あ\n", #<Encoding:UTF-8>] C:\>irb irb(main):001> p [STDIN.external_encoding, STDIN.internal_encoding]; [#<Encoding:UTF-8>, nil] irb(main):002> gets.then { p [_1, _1.encoding] }; あ ["\x82\xA0\n", #<Encoding:UTF-8>] irb(main):003> ``` It seems that making changes on the irb side would have a negative impact on test, etc. I think it is more reliable to deal with this on the ruby.exe side. ---------------------------------------- Feature #19191: Implicit console input transcoding is more desirable https://bugs.ruby-lang.org/issues/19191#change-110735 * Author: YO4 (Yoshinao Muramatsu) * Status: Open ---------------------------------------- In response to Bug #18353, STDIN.internal_encoding are set and encoding is converted explcitly on Windows platform. For example, ```[STDIN.external_encoding, STDIN.internal_encoding] # => [Encoding::Windows-31J, Encoding::UTF-8]``` if STDIN is console. I feel that internal_encoding should be reserved for specific applications. And I think setting internal_encoding to STDIN is not foreseened. Today I found irb breaks STDIN encoding, like ```
ruby -rirb -e "p [$stdin.external_encoding, $stdin.internal_encoding]; IRB.setup(''); IRB::Irb.new(); p [$stdin.external_encoding, $stdin.internal_encoding]" [#<Encoding:Windows-31J>, #<Encoding:UTF-8>] [#<Encoding:UTF-8>, nil]
We know input has console code page encoding. So we always can convert encoding from console code page to io_input_encoding().
### proposal
when reading from console on Windows, input encoding is enfoced to console code page and encoding conversion is implicitly applied.
when ```set_encoding("UTF-8")``` implicitly converts console code page to UTF-8.
when ```set_encoding("CP437", "UTF-8")``` implicitly converts console code page to UTF-8. external_encoding is ignored.
binmode or binary input method is not affected by these specifications.
set_encoding, etc. will continue to work as before, and this specification will affect only when encoding conversion on read (NEED_READCONV() and make_readconv()).
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https://bugs.ruby-lang.org/