friendly_markdown 
by Lin Jen-Shin (godfat)
LINKS:
DESCRIPTION:
Simple markdown for user input, with auto-link, auto-linebreak, and sanitization.
FEATURES:
- Auto-links
- Auto-linebreak
- Sanitization
WHY?
Original markdown doesn't work well for user input, it's unsafe and inconvenient for quick comments.
REQUIREMENTS:
- kramdown
- sanitize
- Tested with MRI (official CRuby), Rubinius and JRuby.
INSTALLATION:
gem install friendly_markdown
SYNOPSIS:
reqiore 'friendly_markdown'
FriendlyMarkdown.compile('user input')CONTRIBUTORS:
- Lin Jen-Shin (@godfat)
LICENSE:
Apache License 2.0
Copyright (c) 2015, Lin Jen-Shin (godfat)
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.