Diff Utils library is an open source library for performing comparison operations between texts: computing diffs, applying patches, generating unified diffs or parsing them, generating diff output for easy future displaying (like side-by-side view) and so on.
The main reason to build this library was the lack of easy-to-use libraries with all the usual stuff you need while working with diff files. Originally it was inspired by JRCS library and its nice design of diff module.
This is originally a fork of java-diff-utils from Google Code Archive. This version is a Rust port of java-diff-utils 4.18 that keeps the results of the Java library.
The GPG signing key in [KEYS] is used for this project's artifacts.
Producing a one liner including all difference information.
use diffutils::DiffRowGenerator; let generator = DiffRowGenerator::builder() .show_inline_diffs(true) .merge_original_revised(true) .inline_diff_by_word(true) .old_tag(|_, _| "~".to_string()) .new_tag(|_, _| "**".to_string()) .build(); let rows = generator.generate_diff_rows( &["This is a test sentence.".to_string()], &["This is a test for diffutils.".to_string()], ); println!("{}", rows[0].old_line);
This is a test sentencefor diffutils.
Producing a side-by-side view of computed differences.
use diffutils::DiffRowGenerator; let generator = DiffRowGenerator::builder() .show_inline_diffs(true) .inline_diff_by_word(true) .old_tag(|_, _| "~".to_string()) .new_tag(|_, _| "**".to_string()) .build(); let original: Vec<String> = ["This is a test sentence.", "This is the second line.", "And here is the finish."] .iter().map(|s| s.to_string()).collect(); let revised: Vec<String> = ["This is a test for diffutils.", "This is the second line."] .iter().map(|s| s.to_string()).collect(); println!("|original|new|"); println!("|--------|---|"); for row in generator.generate_diff_rows(&original, &revised) { println!("|{}|{}|", row.old_line, row.new_line); }
| original | new |
|---|---|
| This is a test |
This is a test for diffutils. |
| This is the second line. | This is the second line. |
Computing, printing, parsing and applying a patch.
use diffutils::{diff, generate_unified_diff, parse_unified_diff}; let original: Vec<String> = vec!["a".into(), "b".into(), "c".into()]; let revised: Vec<String> = vec!["a".into(), "B".into(), "c".into()]; let patch = diff(&original, &revised); let text = generate_unified_diff(Some("a.txt"), Some("b.txt"), &original, &patch, 1); let mut target = original.clone(); parse_unified_diff(&text).apply_to(&mut target).expect("patch applies"); assert_eq!(target, revised);
- Computing the difference between two texts.
- Patch and unpatch the text with the given patch, strictly, with fuzz or with merge-conflict markers
- Parsing and writing the unified diff format, including multi-file git diffs
- Producing human-readable differences
- Inline difference construction
- Algorithms:
- Myers standard algorithm
- Myers with linear space improvement
Add the crate to your Cargo.toml:
[dependencies] diffutils = { path = "../diffutils" }
Build and test with cargo build --release and cargo test.