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Encoding::CompatibilityError when file path has non-ASCII character under some environment
This exception may occur under, for example, Japanese Windows environment.
In the case, the encoding of the string got via ARGV may be not UTF-8 but Windows 31J (a.k.a. Codepage 932).
# demo1.rb
p ARGV.first.encoding
> ruby demo1.rb foo
#<Encoding:Windows-31J>
Generally, two strings which do not contain any non-ASCII character can be joined, even if one is in UTF-8 and the other is in Windows 31J.
p ["foo".encode("UTF-8"), "bar".encode("CP932")].join
# Not raised.
However, if these strings contain a non-ASCII character, Encoding::CompatibilityError occurs.
p ["あ".encode("UTF-8"), "う".encode("CP932")].join
# => `join': incompatible character encodings: UTF-8 and Windows-31J (En
coding::CompatibilityError)
So, if one of the file paths and a cell value of the CSV have any non-ASCII character, the same exception may occur here.
I think that converting the file paths into UTF-8 may solve the problem.