Added special unicode encoding

[ollym]

Fixes a number of unicode encoding issues. Table found here: http://www.w3.org/2001/06/utf-8-test/postscript-utf-8.html

[shairontoledo]

Wow long time anyone fixed anything in postscript level, thank you for doing that. Can you please test with external encoding option for this change? Just put

RGhost::Config::GS[:external_encoding]= 'ascii-8bit'

Before your document creation. If it work correctly I will create a new gem version.

[ollym]

sure I'll give it a go. I'm a bit worried about how this will turn out on Ruby < 1.8 (if you still support that?) but I'll give it a go.

I obviously need to write some tests too, so this is very much still a WIP

[shairontoledo]

We won't support Ruby 1.8 anymore. The coming releases are based on > 1.9.3.

[ollym]

@shairontoledo I can confirm this works with RGhost::Config::GS[:external_encoding]= 'ascii-8bit'

[shairontoledo]

@ollym I had to update ruby_to_ps with encoding utf-8 header. I created a method to print the current UTF-8 mapping:

RGhost::Config.utf8_encodings.render :pdf, :filename => "/tmp/encoding_map.pdf"

It generates http://d.pr/i/TKkh

New version has been created 0.9.4 https://rubygems.org/gems/rghost/versions/0.9.4

Thank you for the collaboration.

[ollym]

Looks good. You'll also need to use something like:

RGhost::Config::GS[:font_encoding] = 'UTF-8'
RGhost::Config::GS[:charset_convert] = -> (text) {
  text.encode(RGhost::Config::GS[:font_encoding], invalid: :replace, undef: :replace, replace: '?')
}