https://github.com/danilamihailov/differ

Small library for creating diffs and applying them
https://github.com/danilamihailov/differ

diff diffing elixir elixir-library

Last synced: about 1 month ago
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Small library for creating diffs and applying them

• Host: GitHub
• URL: https://github.com/danilamihailov/differ
• Owner: DanilaMihailov
• License: apache-2.0
• Created: 2020-01-19T11:39:48.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2020-05-14T04:55:51.000Z (over 4 years ago)
• Last Synced: 2024-10-12T09:42:39.270Z (about 1 month ago)
• Topics: diff, diffing, elixir, elixir-library
• Language: Elixir
• Homepage:
• Size: 165 KB
• Stars: 21
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
# Differ [![Hex Version](https://img.shields.io/hexpm/v/differ.svg)](https://hex.pm/packages/differ) [![docs](https://img.shields.io/badge/docs-hexpm-blue.svg)](https://hexdocs.pm/differ/) [![Coverage Status](https://coveralls.io/repos/github/DanilaMihailov/differ/badge.svg?branch=master)](https://coveralls.io/github/DanilaMihailov/differ?branch=master)

Small library for creating diffs and applying them

```elixir

iex> Differ.diff("Hello!", "Hey!")

[eq: "He", del: "llo", ins: "y", eq: "!"]

iex> Differ.patch("Hello!", [eq: "He", del: "llo", ins: "y", eq: "!"])

{:ok, "Hey!"}

```

## Installation

The package can be installed

by adding `differ` to your list of dependencies in `mix.exs`:

```elixir

def deps do

  [

    {:differ, "~> 0.1.1"}

  ]

end

```

## Documentation

Documentation can be found at [https://hexdocs.pm/differ](https://hexdocs.pm/differ).

## Usage

Simple diff of two maps

```elixir

iex> user = %{name: "John"}

iex> updated_user = Map.put(user, :age, 25)

iex> Differ.diff(user, updated_user)

[{:name, :eq, "John"}, {:age, :ins, 25}]

```

For lists and strings using `List.myers_difference/3` and `String.myers_difference/2` respectevly.

So diffs of lists and strings a excactly output of this functions

```elixir

iex> Differ.diff("Hello!", "Hey!")

[eq: "He", del: "llo", ins: "y", eq: "!"]

```

It is possible to use `Differ` with structs, you need to derive default implementation

for `Differ.Diffable` and `Differ.Patchable` protocols:

```elixir

defmodule User do

    @derive [Differ.Diffable, Differ.Patchable]

    defstruct name: "", age: 21

end

```

And now you can call `Differ.diff/2` with your structs:

```elixir

iex> Differ.diff(%User{name: "John"}, %User{name: "John Smith"})

[{:name, :diff, [eq: "John", ins: " Smith"]}, {:age, :eq, 21}]

```

As well as creating diffs, you can apply diff to a `term`. There is `Differ.patch/2` and `Differ.revert/2` for this purposes.

```elixir

iex> diff = Differ.diff("Hello!", "Hey!")

iex> Differ.patch("Hello!", diff)

{:ok, "Hey!"}

```

or revert diff

```elixir

iex> Differ.revert("Hey!", diff)

{:ok, "Hello!"}

```

For more examples look at the [docs](https://hexdocs.pm/differ/Differ.html).