From: Brian Candler <b.candler@...>
Date: 2008-12-15T22:33:46+09:00
Subject: Re: ruby 1.9.1: Encoding trouble: broken US-ASCII String

Tom Link wrote:
>> text = File.read("text.txt", :encoding=>"ISO-8859-1")
> 
> Unfortunately, this isn't compatible with ruby 1.8. A script that uses
> such a construct runs only with ruby 1.9. Sigh.

If all else fails, read the source.

I see that the encoding falls back to rb_default_external_encoding(), 
which returns default_external, setting it if necessary from 
rb_enc_from_index(default_external_index)

This in turn is set from rb_enc_set_default_external

This in turn is set from cmdline_options.ext.enc.name

And this in turn is set from the -E flag (or certain legacy settings on 
-K). So:

$ ruby19 -E ISO-8859-1 -e 'puts File.open("/etc/passwd").gets.encoding'
ISO-8859-1

Yay. However, if it is possible to set the default external encoding 
programatically (i.e. not via the command line options) I couldn't see 
how.
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