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diffr

Reviewing changes involves reading diffs. Sometimes, a line-oriented presentation of changes is not precise enough, especially when changes involve long lines or very similar consecutive lines.

This program processes such diffs, and outputs them (in the console) with additional diff information on top of the unified diff format, using text attributes.

It works hunk by hunk, recomputing the diff on a word-by-word basis.

The current implementation uses Myers' longest common subsequence algorithm.

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Demo Demo Demo

Installation

Arch Linux

Install from the AUR:

git clone https://aur.archlinux.org/diffr.git
cd diffr
makepkg -si

Homebrew

brew install diffr

From source

You will need the Rust compiler installed.

To install the latest published version:

cargo install diffr

Alternatively, you can build the development version:

git clone https://github.com/mookid/diffr.git
cd diffr
cargo install --path .

How to use it?

diffr tries to be a well behaved Unix program: it reads its input from stdin and writes to stdout.

One-off usage

git show HEAD | diffr

Integration with git

Add the following section to your .gitconfig file:

[core]
    pager = diffr | less -R
[interactive]
    diffFilter = diffr

Alternatively, you can run from the command line:

git config --global core.pager 'diffr | less -R'
git config --global interactive.difffilter diffr

Color customization

Use the --colors flag.

You can customize the display of diffing and common segments of added and removed lines.

For example,

diffr --colors refine-removed:background:200,0,0:foreground:white:bold

tweaks the red used for uniquely removed text;

The configuration used in the first screenshot is

diffr --colors refine-added:none:background:0x33,0x99,0x33:bold --colors added:none:background:0x33,0x55,0x33 --colors refine-removed:none:background:0x99,0x33,0x33:bold --colors removed:none:background:0x55,0x33,0x33

Display line numbers

The --line-numbers displays the line numbers of the hunk.

Related projects

This is improvement on the diff-highlight script distributed with git.

git itself provides both --word-diff and --color-words options to several commands.

About

Yet another diff highlighting tool

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