Parse Git Patch

A TypeScript utility for parsing git format-patch output into structured commit objects.

Features

• Structured Output: Convert raw patch data into structured JavaScript/TypeScript objects.
• Robust Parsing: Handles multi-line commit messages, including tricky formatting and [PATCH] prefixes.
• TypeScript Support: Fully typed, making it easy to integrate into TypeScript codebases.
• Tested & Reliable: Includes a comprehensive test suite powered by Vitest.

Installation

npm install parse-patch

Usage

import { parseGitPatch } from "parse-patch";

const patch = `
From 1234567890abcdef1234567890abcdef12345678 Mon Sep 17 00:00:00 2001
From: Jane Doe <[email protected]>
Date: Wed, 12 Oct 2022 14:38:15 +0200
Subject: [PATCH] Fix a bug in the foo component

Some additional context for the commit message.

---
 file1.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/file1.txt b/file1.txt
index 24967d3..b37620a 100644
--- a/file1.txt
+++ b/file1.txt
@@ -1,6 +1,6 @@
Line 1
-Line 2
+Line 2 changed
Line 3
Line 4
Line 5
Line 6
`;

const commits = parseGitPatch(patch);
console.log(commits);
/*
[
  {
    sha: '1234567890abcdef1234567890abcdef12345678',
    authorName: 'Jane Doe',
    authorEmail: '[email protected]',
    date: 'Wed, 12 Oct 2022 14:38:15 +0200',
    message: 'Fix a bug in the foo component\n\nSome additional context for the commit message.',
    diff: 'diff --git a/file1.txt b/file1.txt\nindex 24967d3..b37620a 100644\n--- a/file1.txt\n+++ b/file1.txt\n@@ -1,6 +1,6 @@\nLine 1\n-Line 2\n+Line 2 changed\nLine 3\nLine 4\nLine 5\nLine 6'
  }
]
*/

API

// Generate patch with `git format-patch --stdout`
parseGitPatch(patch: string): {
  sha: string;
  authorName: string;
  authorEmail: string;
  date: string;
  message: string;
  diff: string;
}[]

License

MIT License