With thanks to the genius who suggested this plugin, GitDiff displays deltas against a git repo in the Xcode source editor once you've saved the file. To use, copy this repo to your machine, build it and restart Xcode. Differences should then be highlighted in orange for lines that have been modified and blue for new code. A red line indicates code has been removed. Hover over deleted/modified line number to see original source.
This Plugin is also available through the Alcatraz meta-plugin and was developed using the Xprobe Plugin for Xcode plugin developers.
Copyright (C) 2014 John Holdsworth
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
DiffMatchPatch License
This plugin includes code from the Objective-C port of Google DiffMatchPatch under an Apache License.