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README.md
Difftastic is an experimental diff tool that compares files based on their syntax.
For installation instructions, see Installation in the manual.
Basic Example
In this JavaScript example, we can see:
(1) Difftastic understands nesting. It highlights the matching { and
}, but understands that foo() hasn't changed despite the leading
whitespace.
(2) Difftastic understands which lines should be aligned. It's aligned
bar() on the left with bar(1) on the right, despite their changes.
(3) Difftastic understands that line-wrapping isn't
meaningful. "eric" is now on a new line, but it hasn't changed.
One Minute Demo
This one minute screencast demonstrates difftastic usage with both standalone files and git.
Languages
Difftastic supports over 20 programming languages, see the manual for the full list.
If a file has an unrecognised extension, difftastic uses a textual diff with word highlighting.
Known Issues
Performance. Difftastic scales relatively poorly on files with a large number of changes, and can use a lot of memory.
Display. Difftastic has a side-by-side display which usually works well, but can be confusing.
Robustness. Difftastic regularly has releases that fix crashes.
Non-goals
Patching. Difftastic output is intended for human consumption, and it
does not generate patches that you can apply later. Use diff if you
need a patch.
(Patch files are also line-oriented, which is too limited for difftastic. Difftastic might find additions and removals on the same line, and it tracks the relationship between line numbers in the old and new file.)
Merging. AST merging is a hard problem that difftastic does not address.
FAQ
Isn't this basically --word-diff --ignore-all-space?
Word diffing can't do this.
Difftastic parses your code. It understands when whitespace matters,
such as inside string literals or languages like Python. It understands
that x-1 is three tokens in JS but one token in Lisp.
Can I use difftastic with git?
You can! The difftastic manual includes instructions for git usage. You can also use it with mercurial.
Does difftastic integrate with my favourite tool?
Probably not. Difftastic is young. Consider writing a plugin for your favourite tool, and I will link it in the README!
License
Difftastic is open source under the MIT license, see LICENSE for more details.
Files in sample_files/ are also under the MIT license unless stated
otherwise in their header.