Fix #103. Add '-Ku' to list of args and prevent problems with utf-8

[zenbro]

I noticed that vscode-ruby checks the code with these arguments: -Wc -Ku.
It turns out that adding -Ku to list of arguments solves problem with utf-8 on macOS (#103).

man ruby says

-K kcode  Specifies KANJI (Japanese) encoding. The default value for script encodings (__ENCODING__) and external encodings
          (Encoding.default_external) will be the specified one. kcode can be one of

                     e       EUC-JP

                     s       Windows-31J (CP932)

                     u       UTF-8

                     n       ASCII-8BIT (BINARY)

And nothing seems broken.

[Arcanemagus]

The -K option was replaced with the -E options clear back in Ruby v1.8, and actually throws a warning in current versions of Ruby so that can't be used.

See #72 (comment) for the warning, and #78 for the original -E___ PR.

[zenbro]

Thanks for the feedback. Good point, I close this PR.

[Arcanemagus]

I don't have a mac to test any of this on, my only guess is that the ruby getting called from within Atom is some positively ancient version that macOS is bundling and what you are getting in the terminal is a different version.

[zenbro]

I tried to debug this case via

const output = await helpers.exec('ruby', ['--version'], {});
console.log(output);

and it's returned: ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin17]
but problems from #103 still exists.
Atom launched not from terminal btw.

Strange things 😐

[Arcanemagus]

Hmmmmmmm, we already know that the command line arguments for the macOS version of Ruby are different from every other OS, maybe whoever is making macOS Ruby didn't get the memo on the --external-encoding/--internal-encoding changes and still only has -K implemented? 😮

This is what happens on Windows:

If you run that second command do you get the warning?

[zenbro]

Yep.

> ruby -v
ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin17]

> which ruby
/usr/local/bin/ruby

> ruby -w -c --external-encoding=utf-8 --internal-encoding=utf-8 -Ku ./bad.rb
ruby: warning: -K is specified; it is for 1.8 compatibility and may cause odd behavior
./bad.rb:2: warning: assigned but unused variable - payload
./bad.rb:13: syntax error, unexpected keyword_end, expecting end-of-input
fruit.each end |e|