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This file is part of Logtalk
SPDX-FileCopyrightText: 1998-2024 Paulo Moura
SPDX-License-Identifier: Apache-2.0

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.


Thanks for considering contributing to Logtalk. All contributions are most welcome, including code patches, bug reports, documentation fixes, feature suggestions, portability improvements, new libraries, new examples, and improved support for text editors and IDEs. No contribution is too small. The file lists past contributions and their authors. Looking forward to seeing your name there. Contributors are expected to follow the Code of Conduct.

How to make a contribution

For bug reports and suggestions, create a ticket in our issue tracker at:

If you prefer to discuss your contribution first with other developers, you can join us for live discussion at our chat room:

In alternative, you can also join our discussion forums at:

For contributing improvements and fixes to the Handbook, open it in your web browser, click on link on the top right that says "Edit on GitHub", make the proposed changes, and submit them as a pull request.

In the specific case of developer tools and libraries documentation, note that their Handbook sections are automatically generated from the tool and library directory files.

In the case of code contributions, you are required to follow the coding guidelines described at:

Submit your code contribution by forking Logtalk, working on a topic branch, and creating a pull request. If you're not familiar with pull request based contributions to open source projects, see e.g.

When contributing compiler, runtime, or library enhancements, ensure there are no regressions by testing your contribution. For details, see:

Ideally, new code should come with a comprehensive test set. For writing tests, see our unit testing framework documentation at:

Please note that portability is a main Logtalk feature. As a general rule, new code should depend only on standard or de facto standard features available from the supported backend Prolog systems. But contributions that enhance the integration with a particular backend Prolog system are also sought as long they don't break support for other systems.

Integrating your contribution

Major code and documentation contributions require the contributor to sign-off that they adhere to the Developer Certificate of Origin (DCO):

Contributions should be made available under the Logtalk license without any additional terms or conditions. Contributions using other licensing terms may also be distributed with Logtalk with the understanding that the terms of their use depends solely on the authors chosen license terms and may require a separate, independent, agreement between users and authors.