Push current branch to a GitHub remote then open the GitHub compare page

git_push_branch.bash

# Push the current branch to a remote with the same branch name then open the
# github page comparing that branch to open a pull request.
# Additional args that are passed to this function are given to the "git push" command.
gpb ()
{
  remote=$1
  shift

  if [ -z $remote ]; then
    echo "ERROR: you must specify a remote name"
    return
  fi

  remote_url=$(git config --get remote.$remote.url | sed -e 's/^ssh:\/\///' | sed -e 's/\.git$//' | tr : / )

  if [ -z $remote_url ]; then
    echo "ERROR: $remote is not a valid remote name"
    return
  fi

  git_branch=$(git branch 2>/dev/null | sed -n '/^\*/s/^\* //p')
  url_branch=$(perl -MURI::Escape -e "print uri_escape(join(' ', @ARGV))" -- $git_branch)

  git push $@ $remote $git_branch && open "https://$remote_url/compare/$url_branch?expand=1"
}