First version

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](https://semver.org/).
+
+## [Unreleased]
+
+## [0.1.0] - 2025-01-22
+
+### Added
+
+- Format and parse
+- Initialize a new changelog file
+- Add a new change to a release
+- Add a new release
+- List all releases
+- Show all changes in a release
+- Merge two or more changelog files
+
+[Unreleased]: https://example.com/compare/v0.1.0...HEAD
+[0.1.0]: https://example.com/releases/tag/v0.1.0

README.md

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+# Changelog parser
+
+A command-line tool to easily manage and manipulate changelog files, ensuring consistency with the [keep a changelog](https://keepachangelog.com) format.
+
+## Features
+
+- Format and parse: Validate and automatically format your changelog file.
+- Initialize a new changelog file: Quickly set up a standardized changelog for your project.
+- Add a new change to a release: Easily add a new change to your changelog.
+- Add a new release: Cut a new release in your changelog.
+- List all releases: Get a list of all releases in your changelog.
+- Show all changes in a release: Display all changes in a specific release.
+- Merge two or more changelog files: Combine multiple changelog files into one.
+
+## Usage
+
+Default parameters use the `CHANGELOG.md` file in the current directory, this can be changed with the `-f` flag.
+
+### Format and parse
+
+The `fmt` command parses and formats the changelog file to adhere to the keep a changelog format.
+
+```shell
+changelog-parser fmt
+```
+
+This command exits with a non-zero status code if the changelog format is invalid.
+
+```shell
+changelog-parser fmt --silent || echo "Invalid changelog format"
+```
+
+Changes can be written back to the file with the `--write` flag.
+
+### Initialize a new changelog file
+
+The `init` command initializes a new changelog file.
+
+```shell
+changelog-parser init
+```
+
+This command creates a new changelog file with the following content:
+
+```shell
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](https://semver.org/).
+
+## [Unreleased]
+
+## [0.1.0] - 2025-01-21
+
+[Unreleased]: https://example.com/compare/v0.1.0...HEAD
+[0.1.0]: https://example.com/releases/tag/v0.1.0
+```
+
+This example uses default values, but title, description, url, and initial release version can be configured.
+
+### Add a new change to a release
+
+The `add` command adds a new change to the changelog file.
+
+```
+changelog-parser add --type added "New feature"
+changelog-parser add --type security "Fix security issue"
+```
+
+Those commands add the following content to the changelog file:
+
+```shell
+### Added
+
+- New feature
+
+### Security
+
+- Fix security issue
+```
+
+### Add a new release
+
+The `release` command adds a new release to the changelog file.
+
+```shell
+changelog-parser release 1.0.0
+```
+
+This command adds the following content to the changelog file:
+
+```diff
+--- CHANGELOG.md
++++ CHANGELOG.md
+@@ -9,2 +9,4 @@
+
++## [1.0.0] - 2025-01-21
+
+ ### Added
+@@ -19,3 +21,4 @@
+
+-[Unreleased]: https://example.com/compare/v0.1.0...HEAD
++[Unreleased]: https://example.com/compare/v1.0.0...HEAD
++[1.0.0]: https://example.com/compare/v0.1.0...v1.0.0
+ [0.1.0]: https://example.com/releases/tag/v0.1.0
+```
+
+A date can be specified with the `--date` flag.
+
+### List all releases
+
+The `list` command lists all releases in the changelog file.
+
+```shell
+changelog-parser list
+```
+
+This command prints the following content:
+
+```shell
+1.0.0
+0.1.0
+```
+
+### Show all changes in a release
+
+The `show` command shows all changes in a release.
+
+```shell
+changelog-parser show 1.0.0
+```
+
+This command prints the following content:
+
+```shell
+## [1.0.0] - 2025-01-21
+
+### Added
+
+- New feature
+
+### Security
+
+- Fix security issue
+```
+
+### Merge two or more changelog files
+
+The `merge` command merges two (or more) changelog files.
+
+```shell
+changelog-parser merge other/CHANGELOG.md
+```
+
+This command merges the content from `other/CHANGELOG.md` latest release into the current changelog file.
+
+The source release to be merged can be specified with `other/[email protected]`.
+The destination release version can be specified with `--version` flag.
+
+Multiple changelog files can be merged by specifying multiple files.
+
+## Credits
+
+- https://github.com/oscarotero/keep-a-changelog

index.js

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+#!/usr/bin/env node
+
+import { cmd } from './src/main.js';
+
+try {
+  // Run the program
+  cmd().parse();
+} catch (error) {
+  if (error instanceof Error) {
+    console.error(`Failed: ${error.message}`);
+    process.exit(1);
+  }
+}