Add support for non-PNG assets

[elektronaut]

This adds support for having custom emojis that aren't PNG files. In other words - you can now have animated GIFs.

Usage:

emoji = Emoji.create("music") do |char|
  char.set_format "gif"
end

emoji.image_filename # => "music.gif"

[mislav]

Nice direction! We definitely need this customizable. I'll think about this API some more— I feel that it might be easier and more flexible for our users to just have the entire filename for the custom emoji customizable instead of just the extension. What do you think?

[elektronaut]

I definitively agree, that would be much better.

Personally, I think making image_filename behave like an attribute would be the most Ruby-like solution. Then again, everything else on Character behaves like commands, so it might look weird.

class Emoji::Character
  attr_accessor :image_filename

  def image_filename
    @image_filename || default_image_filename
  end

  private

  def default_image_filename
    if custom?
      '%s.png' % name
    else
      'unicode/%s.png' % hex_inspect.sub(/-fe0f\b/, '')
    end
  end
end

[mislav]

How about we just do that? Looks solid.

[elektronaut]

👍

I've updated the pull request.

[mislav]

Maybe change that to subdirectory/my_emoji.gif to demonstrate that you can both add directory paths as well as change the extension

[elektronaut]

All good points, I've amended the commit.

[mislav]

Cool thanks! 👍

[elektronaut]

🎉 Thank you!