carrierwave

https://github.com/carrierwaveuploader/carrierwave

Ruby

Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks

Mail::Field#unfold

2.2.3. Long Header Fields

 The process of moving from this folded multiple-line representation
 of a header field to its single line representation is called
 "unfolding". Unfolding is accomplished by simply removing any CRLF
 that is immediately followed by WSP.  Each header field should be
 treated in its unfolded form for further syntactic and semantic
 evaluation.

Source | Google | Stack overflow

Edit

git clone [email protected]:carrierwaveuploader/carrierwave.git

cd carrierwave

open

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Mail--Field-unfold-for-pr

# Commit to git

git add git commit -m "better docs for Mail::Field#unfold"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Mail--Field-unfold-for-pr

hub pull-request

# Celebrate!