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# java-diff-utils
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Diff Utils library is an OpenSource library for performing the comparison / diff operations between texts or some kind of data: 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.
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## Status
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[](https://travis-ci.org/java-diff-utils/java-diff-utils)
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[](https://www.codacy.com/app/wumpz/java-diff-utils?utm_source=github.com&utm_medium=referral&utm_content=java-diff-utils/java-diff-utils&utm_campaign=Badge_Grade)
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[](http://maven-badges.herokuapp.com/maven-central/io.github.java-diff-utils/java-diff-utils)
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## Intro
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Diff Utils library is an OpenSource library for performing the 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.
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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 it's nice design of diff module.
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**This is originally a fork of java-diff-utils from Google Code Archive.**
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## API
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Javadocs of the actual release version: [JavaDocs java-diff-utils](https://java-diff-utils.github.io/java-diff-utils/4.7/docs/api/)
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## Examples
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Look [here](https://github.com/wumpz/java-diff-utils/wiki) to find more helpful informations and examples.
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These two outputs are generated using this java-diff-utils. The source code can also be found at the *Examples* page:
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**Producing a one liner including all difference information.**
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This is a test ~senctence~**for diffutils**.
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**Producing a side by side view of computed differences.**
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|original|new|
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|--------|---|
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|This is a test ~senctence~.|This is a test **for diffutils**.|
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|This is the second line.|This is the second line.|
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|~And here is the finish.~||
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## Main Features
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* computing the difference between two texts.
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* capable to hand more than plain ascii. Arrays or List of any type that implements hashCode() and equals() correctly can be subject to differencing using this library
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* patch and unpatch the text with the given patch
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* parsing the unified diff format
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* producing human-readable differences
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* inline difference construction
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* Algorithms:
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* Myer
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* HistogramDiff using JGit Library
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### Algorithms
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* Myer's diff
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* HistogramDiff
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But it can easily replaced by any other which is better for handing your texts. I have plan to add implementation of some in future.
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## Source Code conventions
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Recently a checkstyle process was integrated into the build process. java-diff-utils follows the sun java format convention. There are no TABs allowed. Use spaces.
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```java
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public static <T> Patch<T> diff(List<T> original, List<T> revised,
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BiPredicate<T, T> equalizer) throws DiffException {
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if (equalizer != null) {
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return DiffUtils.diff(original, revised,
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new MyersDiff<>(equalizer));
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}
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return DiffUtils.diff(original, revised, new MyersDiff<>());
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}
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```
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This is a valid piece of source code:
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* blocks without braces are not allowed
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* after control statements (if, while, for) a whitespace is expected
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* the opening brace should be in the same line as the control statement
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### To Install
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Just add the code below to your maven dependencies:
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```xml
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<dependency>
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<groupId>io.github.java-diff-utils</groupId>
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<artifactId>java-diff-utils</artifactId>
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<version>4.5</version>
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</dependency>
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```
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or using gradle:
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```groovy
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// https://mvnrepository.com/artifact/io.github.java-diff-utils/java-diff-utils
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implementation "io.github.java-diff-utils:java-diff-utils:4.5"
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```
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