Detect manifest-(fingerprint).json instead of manifest.yml for rails4 about heroku-buildpack-ruby HOT 7 CLOSED

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oops! how is the fingerprint generated?

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I think here: https://github.com/sstephenson/sprockets/blob/master/lib/sprockets/manifest.rb#L53

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So on https://github.com/heroku/heroku-buildpack-ruby/blob/master/lib/language_pack/rails4.rb#L40-L57, change:

if File.exists?("public/assets/manifest.yml")
...
else

to

unless Dir.glob('public/assets/manifest-*.json').empty?
...
else

If you're like me and don't care for unless [...] else l, then just swap the code blocks. That work?

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I think that looks right.

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@brettgoulder suggested if Dir.glob('public/assets/manifest-*.json').any? as opposed to the unless..else.

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Fixed by #74 .

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