Released Changelog Fragments Creator (2023-07-26):
Changelog Fragments Creator (a changelog generator in Python) may be used in development setups where working on a single file might result in ongoing merge conflicts due to too many changes on the same file. This is where Changelog Fragments Creator steps in to solve this by creating YAML based files for each PR according to its planned release version. The output format is based on Keep a Changelog, and this project adheres to Semantic Versioning. This changelog creator is written for minimal setups to be usable across almost all systems (platforms and distributions). Therefore, some dirty stunts were needed to avoid templating (jinja2), etc. to drop some imports that would require additional dependencies. It only requires a basic Python 3 installation on the system.

This project has been created after a some frustrations in several projects where working with several developers on the same project with a higher count of pull requests lead into ongoing merge conflicts on the same file. On and on resolving these merge conflicts resulted in writing this small and handy tool which is included within the release pipeline and creates the needed changelog file.

The file structure is easy and simple for developing with several developers at the same time even when supporting multiple releases at the same time. Next to this, changes are easy to cherry-pick. Therefore, no worries about ongoing backports etc.
    └── changelog-fragments
        ├── 0.9
        │   ├── 123_initial_build.yaml
        │   ├── 124_remove_dependency.yaml
        │   └── release_meta.yml
        ├── 1.0
        │   ├── 487_initial_stable_release.yml
        │   └── release_meta.yml
        ├── 1.11

Within the previously mentioned overview you can already see, that there is just a single directory containing all release versions. This may be older, current and also upcoming release. Therefore, there is not any Unreleasedchapter. However, if you like you can still create one and it is honored, but you may also directly set the files according to the planned release version.

As a result we have a directory with sub-directories representing their release version:
   └── changelog-fragments
        ├── 0.9
        ├── 1.0
        ├── 1.11
        ├── 1.11b
        ├── 1.12
        ├── 12.0.3

Within each of this directories a single release_meta.yml file in YAML syntax is needed which contains the meta information for the according release version. This also includes the release date. A minimal version looks like:
date: 2023-07-20
description: Initial release
The changelog fragments represent a single line within generic changelog and are also simple to create. Each fragment is written in a YAML syntax and should represent the following naming convention:

An the file could be named in a similar way:

However, this is just a convention and different names schemas may also work. By default, the file extensions must be .yml or .yaml but other ones may be optionally included (see also parameters section).

The content of this file is the most important and will be integrated within the final changelog file. The structure for this file is also small and easy. For example it might look like:
  - Removed unneeded dependencies [#124]
  - Removed development test file [#124]
  - Changed to new layout structure [#487]

According to Keep a Changelog the following states/actions are usable:
* Added
* Changed
* Deprecated
* Removed
* Fixed
* Security
* Project Information

More and detailed information as well as a quick starter and howtos can be found on the official project website on GitHub: