Turn the current directory's diff into a gist with a single .diff file (assumes you have osx with "pbcopy" and ruby)

d2g.sh

function d2g() {
  if [ -z "`git diff`" ] ; then
      echo 'There is no diff to publish, brah.'
      return
  fi
  if [ $# -eq 0 ] ; then
      echo 'Please provide a name for the file.'
      return
  fi
  curl -H "Authorization: token XXXXtokenWithGistScopeXXXX" -d "{\"description\":\"diff for branch: `git branch | grep \* | sed s/\*\ //g`, created: `date`\",\"public\":false,\"files\":{\"$1.diff\":{\"content\":\"`ruby -e 'require "rubygems";require "json";puts JSON.dump(\`git diff\`)[1..-2]'`\"}}}" https://api.github.com/gists | grep '^  "html_url": "https://gist.github.com' |  sed s/\ \ \"html_url\"\:\ \"//g | sed s/\",// | pbcopy
}

# build a github token: curl -u 'username' -d '{"scopes":["gist"],"note":"Helper for quick gist from diff"}' https://api.github.com/authorization

usage.sh

# create a gist with file named monday_project.diff, 
# and place the newly created gist URL in my clipboard
d2g monday_project

my sed statements are slightly fragile - changes to the JSON produced by github's API could break the final bit of this that extracts the new gist URL to the clipboard.