The git-branch-diff tool is a simple script for performing a directory compare of the current state of the working tree of a given branch since it was originally branched. This is largely intended to be used with a graphical directory compare tool.
To learn more about the background and rationale behind this tool, see the blog post
Download the git-branch-diff script, save it somewhere in your PATH, and make sure it is executable.
By default, this will use the command-line diff -r command as the directory compare. The whole reason this was created was to enable the use of a graphical directory compare tool. To configure the tool you would like to use, you can set a git configuration, such as:
git config --global branchdiff.cmd /path/to/dir/cmp/tool
or you can set it in an environment variable, e.g.:
export GIT_BRANCH_DIFF_CMP=/path/to/dir/cmp/tool
The tool you use should take two parameters: the left-side directory (i.e.: the "before" tree) and the right-side directory (i.e.: the branch's current working tree).
I highly recommend SmartSynchronize, by syntevo GmbH. From their website:
SmartSynchronize is a multi-platform file and directory compare tool. It helps you to compare two files or directory trees, to merge changes between files and directories, i.e. to synchronize them, or to 3-way-merge changes of one file which has been changed independently.
To configure git-branch-diff to use SmartSynchronize, on Mac OS X, for example:
git config --global branchdiff.cmd /Applications/SmartSynchronize.app/smartsynchronize.sh
This script is intended to be run from the root directory of the working copy of the branch you wish to compare to ise "parent". For example, say you have a repository that looks like:
u---v---w---[uncommitted] <--- my_topic
/
a---b---c---d---e---f <--- master
You would want to run this script from the my_topic branch to see all the differences between the current state of the my_topic branch and the point at which it branched from its parent branch (e.g.: commit 'c'). In this example, that amounts to the changes from: x + y + z + uncommitted. E.g.:
git checkout my_topic
git branch-diff master
If the name of the parent branch is 'master', then it may be omitted, as this is assumed as the default.
Technically, this script does not necessarily diff against the point at which the branch was created. It diffs against the last point the branch has in common with the specified parent. For example, if the my_topic branch had the head of master merged into it again later, the diff would be against that point in master:
u---v---w---x---y---z---[uncommmited] <--- my_topic
/ /
a---b---c---d---e---f---g <--- master
In this case the differences shown amount to the changes from x + y + z + uncommited changes.
This script was quickly slapped together in Ruby, but mostly using shell commands. It is probalby not optimal or even well tested. There may even be a better more concise way to do this with some built-in git command I couldn't find. It has really only been tested on Mac OS X 10.6 (Snow Leopard) with git version 1.7.0.3 using SmartSynchronize 3.1.6. Your mileage may vary.
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