Difftastic is an experimental diff tool that compares files based on their syntax. See [the manual](http://difftastic.wilfred.me.uk/) to get started. ## 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 [](https://asciinema.org/a/480875) This one minute screencast demonstrates difftastic usage with both standalone files and git. ## Languages Difftastic supports the following languages: * Bash * C * C++ * C# * Clojure * Common Lisp * CSS * Dart * Elixir * Emacs Lisp * Go * Haskell * Java * JavaScript (and JSX) * JSON * OCaml * PHP * Python * Ruby * Rust * Scala * TypeScript (and TSX) If a file has an unrecognised extension, difftastic uses a line-oriented diff. ## 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. Merging. AST merging is a hard problem that difftastic does not address. ## 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.